The 10th Conference of AsianInternational Association of
Dental Traumatology
2023 . 2 . 5 (SUN)
Listed in Home page : www. ja-dt.org

Organizing Chairman: Dr Masao Irie
Organizing Vice-Chairman: Dr Norihiro Sonoi
Organizing Secretary : Dr Hiroaki Taketa− 100 −

Message from the President of
JADT and AADTThere are three Academic Societies in the field of dental traumatology : International
Association of Dental Traumatology (IADT) recognized in the world, Japan
Association of Dental Traumatology (JADT) in Japan, and Asian Association of Dental
Traumatology (AADT) in Asian. They respectively expand clinical assessment based on
the basic and clinical sciences from education, research work and clinical performance.
The specialized fields in each university and dental service organization play key roles
to continue developing toward the medical forefront.
The 10th AADT was had been scheduled to be held in India on November 1 and 2 lastyear but was cancelled due to COVID-19, and it was suddenly forced to be held in
Okayama on February 5, this year on our website.
From the situation of stomatology, it is very important for healthy life expectancy topreserve as many as a tooth. It is further important to restore traumatic occlusion basedon the fracture and the dislocation characteristics, as a base oral cavity medicine. In
these societies of traumatology, therefore, it needless to say on what Pedodontics,
Endodontics, Operative Dentistry, Biomaterials, Dental Radiology, Oral Surgery, Oral
Pathology, Neuropathology, and Clinical Pathology should be deeply related.
Finally, I want to do "SCIENCE" of Dental Traumatology by discussing through theproceeding in the program as you can look at in this booklet.
I hope we will see you again in WEB (Okayama, Japan).

Prof. Mitsutaka Kimura, DDS, PhD
President, Asian International Association of Dental Traumatology
President, Japan Association of Dental Traumatology−1−Greeting from Okayama

The 10th AADT was scheduled to be held in India on November 1 and 2 last year, but
was cancelled due to COVID-19, so it was suddenly decided to hold it in Okayama on
February 5 on our website. Despite the short notice, we were pleased to receive as manyas about 20 abstracts.
The purpose of this AADT has been to promote the advancement and developmentof oral trauma care, and to improve the knowledge of our members through thepromotion of medical care and research. Recently, academic activity in COVID-19 has
been stagnant, and COVID-19 shows no signs of slowing down yet. I hope that thisconference will help our members to make a leap forward in their medical practices for
tomorrow.
I know that it is a great psychological burden for our members to be in the midst of
infection by COVID-19, but we are holding this conference in the hope that it will
provide them with as much information as possible on trauma dentistry.
Finally, I would like to express my deepest gratitude to the members of the preparatorycommittee.

Dr. Masao Irie, DDS, PhD
The president of 10th AADT

−2−

Contents
Message from the President, AADT, Mitsutaka Kimura, DDS, PhD
Message from the Organizing Chairman Masao Irie, DDS, PhD

List of Abstracts
1.

Dr. Michiyo Miyashin（Japan）

2.

Dr. Pornpoj Fuangtharnthip（Thailand）

3.

Dr. Yoshihiko Sugita（Japan）

4.

Dr. Kumiko Nozaka（Japan）

5.

Dr. Atsuko Baba（Japan）

6.

Dr. Yuta Inoue（Japan）

7.

Dr. Masao Irie（Japan）

8.

Dr. Junya Ono（Japan）

9.

Dr. Makoto Saito（Japan）

10.

Dr. Daishi Saito（Japan）

11.

Dr. Yasutaka Yawaka（Japan）

12.

Dr. Takehiro Hattori（Japan）

13.

Dr. Takahiro Totani（Japan）

14.

Dr. Yoko Inoue（Japan）

15

Dr. Katsuyuki Yamanaka（Japan）

16.

Dr. Tadashi Yoshida（Japan）

17.

Dr. Mitesh Tewari（India）

18.

Dr. Kuniomi Nakamura（Japan）

19.

Dr. Sho Odawara（Japan）−3−

Michiyo Miyashin
Hanako Dental Clinic for Children
E-mail : mmiyashin@gmail.com

Idiopathic Resorption in Primary dentition:
Review of the literature
Abstract : The primary teeth may fall out early or collapse despite the absence of dental
trauma. Other than pre-juvenile periodontitis, pathological root resorptions occurring
earlier than biological resorption are the causes of early loss of primary tooth. Amongthese resorptions, idiopathic resorption(IR) is the pathological resorption for which thecause cannot be determined, resulting in simultaneous resorption or continual resorption
in multiple teeth. The information about IR is essential for dental traumatology. The
purpose of this lecture is to describe the review of previous case reports from a literature
on IR of primary teeth.
Materials & Method : The literature search was conducted for English and Japaneselanguage articles using Pub Med and Central Journal of Medicine as of October 2022with the search keywords idiopathic, root resorption, internal resorption, and primary
teeth.
Results : The total number of the reports of IR was 23 cases of 176 teeth and thenumber of teeth with IR was 3-17 per case. The chief complaint in the IR cases werediscoloration and high mobility, collapse or crown fracture and loss of primary teeth.
In the X-ray examination, internal resorption was observed in all cases, and perforation
was seen in 26 teeth. In follow-up process, pulp canal obliteration and calcification of
pulp can be predictors of IR. Clinical follow-up of the IR cases showed intact successor
permanent teeth.
Conclusion : It is recommended that treatment of a non-perforating IR should be pulp
extirpation promptly with electrical apical locator. In root canal treatment, calcium
hydroxide-water paste halted the IR, and root canal filling with ZnO2-Eugenol paste
prevented premature loss of primary teeth. Once IR is idicated, short-term follow-up
should be performed to preserve the teeth and long-term follow-up should be conducted
to examine evidence of the success of treatments performed.
Key words : Idiopathic resorption , pulp canal obliteration , Pink tooth,
Root canal treatment for primary tooth−4−

Brief CV
Education and Academic Qualifications
1981 D.D.S., Tokyo Medical and Dental University (TMDU)
1981 Pedodontics Course, Department of Pediatric Dentistry, TMDU
1991 Ph.D., TMDU
Positions and Employment
1981
Clinical Fellow, Dental Hospital, Faculty of Dentistry, TMDU
1990
Assistant Professor, Department of Pediatric Dentistry, TMDU
2014
Associate professor (Head), Department of Pediatric Dentistry, Graduate schoolof Medical and Dental Sciences, TMDU
2020
Clinical Professor, Dental Hospital, Faculty of Dentistry, TMDU
2021-Present Consultant, Hanako Dental Clinic for Children
Labo M−5−

Pornpoj Fuangtharnthip1）, Kwanlada Sakulsak2）,
Natchaya Raksatcha2）, Natchaya Visanuyothin2）,
Thanyachanok Menasuta2）,
Thanawut Khongpreecha1)
1)Department of Advanced General Dentistry, Mahidol
University, Faculty of Dentistry, Bangkok, Thailand.
2)
Mahidol University, Faculty of Dentistry, Bangkok,
Thailand.

E-mail : pornpoj.fun@mahidol.ac.th

Readiness for Emergency Dental Trauma in Secondary
Schools in Bangkok
The young population spends most of their time at school participating in a lot of
activities that are risky for dental trauma.
Objective : Our study aimed to find out the readiness in emergency dental trauma
management among secondary schools in Bangkok.
Materials & Method : Structured interviews and data collection were conducted with the
in-charge nurses from 15 secondary schools about school policy, health stations or nurse
rooms, health personnel, and documentation on the management of traumatic dental
injuries. This study included 7 public schools and 8 private schools.
Results : The results showed that all of the schools provide general accident insurancewith 66.67% dental treatment coverage. None of the surveyed schools provide seminars
on dental emergency management for staff and nurses. The mean (SD) number ofhealth stations in the schools is 1.53 (±0.92) and the mean (SD) number of nurses per1000 students is 1.27 (±0.57). Only 1 out of 15 in-charge nurses had ever attended aseminar on dental trauma management. All of the surveyed schools (66.67%) have arecording system for dental trauma incidents: 66.67% use manual recording with further
computerized input, 26.67% only manual, and 6.67% with computer-based recording
systems first-hand. Among the surveyed schools, only 13.33% have a formatted referral/
reporting form, whereas all schools seem to perform informal follow-ups.
Conclusion : Our study indicates that not all schools in Bangkok provide general accident
insurance with dental treatment coverage. However, most of them have prepared ahealth care system with limited health personnel, and manual recording of incidents withinformal referral and follow-up systems, when dealing with dental trauma at school.
Key words : Dental trauma, emergency management, secondary school, readiness−6−

Brief CV
Educational Background:
1986-1994 Doctor of Dental Surgery (DDS) Mahidol University, Faculty of Dentistry, Thailand
1995-2000 Certificate of Training in Pediatric Dentistry,
Ph.D. (Dental Science), Tokyo Medical and Dental University.
rofessional Experience:
1994-2004 Lecturer, Department of Advanced General Dentistry, Mahidol University,
Faculty of Dentistry.
2005-present Assistant Professor, Department of Advanced General Dentistry, Mahidol
University, Faculty of Dentistry.
2011-2012 Vice-chair, Thai Society of Pediatric Dentistry2016-present Adjunct Lecturer, Faculty of Dentistry, Tokyo Medical and Dental University.
2019-present Chair of Department of Advanced General Dentistry, Mahidol University,
Faculty of Dentistry.

−7−

Yoshihiko Sugita, Takehiro Hattori,
Toshikatsu Suzumura, Yuuki Ito, Ryoko Kawai,
Waka Yoshida, Katsutoshi Kubo,
Hatsuhiko Maeda
Department of Oral Pathology and Forensic Odontology,
School of Dentistry, Aichi Gakuin University.

E-mail : yosshii@dpc.agu.ac.jp

LLLI promote proliferation and differentiation of chondrocytes
in the cultured rat mandibular condyle
Objects : Recently, the efficacy of low reactive level laser irradiation (LLLI) has beenreported to be effective treating osteoarthritis-related pain and disorders. In this study,
we investigated the effects of LLLI on the mandibular condyle in organ culture.
Materials and Methods : The mandibular condyles were removed from Sprague Dawley(SD) rats were used in this experiment. The mandibular condyle used for the histologicalsearch was divided into the following 4 groups: Control group, organ culture only; F+Lgroup, with basic fibroblast growth factor (bFGF) added to the medium; F-L+ group,
LLLI ; and F+L+ group, with bFGF added to the medium and LLLI. The culture was
performed using BGJb mediums containing bFGF (100 ng/mL) and no bFGF. LLLI
(wavelength 633 nm) was performed on the cultured mandibular condyle under thefollowing conditions: irradiation power 250 mW, time 30 seconds, and distance 10 mm.
LLLI started at culture (day-0) and was performed 5 times in total up to the 4th day at
24-hour intervals. After organ culture, tissue was sectioned and stained with H-E stain
for histological observation.
Results : In the F+L+ group, the mandibular condyle was larger than that in the control
group, the differentiated and hypertrophied layers were large, and the cell number wasincreased. The size of the mandibular condyle increased the most in the control group,
followed by the F+L- group, F-L+ group, and F+L+ group. In addition, in the F+L- andF-L+ groups, intermediate histological findings were observed between the control and
F+L+ groups.
Conclusions : The results of this study showed that LLLI promote cell proliferation in
the mandibular condyle as much as the addition of bFGF. Therefore, it is suggested that
LLLI (633 nm) may promote proliferation and differentiation of chondrocytes in themandibular condyle.
Key words : LLLI , rat, mandibular condyle , organ culture , bFGF

−8−

Brief CV
Educational Background:1998 DDS, Aichi Gakuin University
2002 PhD, Aichi Gakuin University
Position and Employment
2003-2008
Assistant professor, Department of Oral Pathology, School of Dentistry, Aichi
Gakuin University
2008-2013
Associate professor/lecturer, Department of Oral Pathology, School of Dentistry,
Aichi Gakuin University.
2009-2010 Visiting Scholar, Advanced Prosthodontics and Weintraub Center for
Reconstructive Biotechnology, UCLA School of Dentistry.
2013-present Associate professor, Department of Oral Pathology, School of Dentistry, Aichi
Gakuin University.

−9−

Kumiko Nozaka
Aoba Dental and Pediatric Dental Clinic

E-mail : kuminoza@eos.ocn.ne.jp

Clinical consideration of central cusp fracture
Objects : Central cusp has a pulp cavity in the cusp, unlike interstitial cusp or otherabnormal cusps. Thus, occasionally, pulp exposure occurs due to attrition or fracture.
This can result in pulp infection leading to pulp death, or even complications such asapical periodontitis.
Materials & Methods : There were nine teeth of six patients (youngest: nine years
and six months, oldest: 24 years, others: 11 to 15 years) who experienced various
complications after the fracture or attrition of the central cusp. Eight of nine teeth weremandibular, and the first and second premolars were four and five, respectively. Six outof nine teeth were in the process of root formation.
Results : Five out of six patients visited our office complaining of occlusal pain andswelling. Three teeth were treated with pulpectomy, and six required root canal therapy
for infected root canals.
Conclusion : Central cusp fracture occurs due to strong masticatory force at theocclusal contact of teeth in the buccal segment. Therefore, it is advisable to conduct
reinforcement to prevent central cusp fracture or take a preventive measure such as
pulpotomy. Although endodontic treatment may be needed in the near future, fracture
should be avoided until the root formation is nearing completion.
Key words : Clinical consideration of central cusp fracture

Brief CV
Education and Academic Qualifications
1966
DDS, Tokyo Dental College
1979
PhD, Tokyo Dental College
Positions and Employment
1979 – 2001 Associate Professor, Department of Pediatric Dentistry, School of Dentistry,
Iwate Medical University.
2001 – 2002
Department of Pediatric Dentistry, Morioka Children’s Hospital.
2002 – Present Private Dental Office ( Aoba Dental and Pediatric Dental Clinic )− 10 −

Atsuko Baba
Fukuoka Dental College, Department of oral growthand development division of Pediatric DentistryE-mail : babaatsu@fdcnet.ac.jp

A Case of Multiple Tooth Fractures Caused by HighEnergy Trauma
Purpose : I report on our experience of dental treatment of a child who jumped fromthe third floor of a junior high school building after treatment for high-energy trauma.
Written consent for this presentation has been obtained from the parents.
Case: 15-year-old girl, Chief complaint : dental treatment
Present Medical History : She jumped from the third floor of her school building andwas transported to a nearby emergency hospital by ambulance. About 6 months after
systemic treatment, she was referred to our hospital for treatment of a fractured crownof multiple teeth.
History : #1: after suicide attempt by jumping #2: ADHD #3: ASD #4: postoperativeleft pelvic fracture (both column fractures) , left distal radius fracture , left ankle tricarp
fracture , multiple mandibular fractures , laceration and suture on left lower lip andmastoid area #5: multiple tooth fractures.
Oral Findings : Hellman's dental age stage IVA, normal occlusion, 6 1 2 5 65 6
showed dentin fracture without pulp exposure, 4 loss.
Treatment and Progress : 1 2 5 6 5 6 was restored with composite resin, and 6 wasrestored with a preformed metal crown. 4 was fitted with a temporary denture after
extraction of the remaining root. 6 became non-vital 7 months after treatment, and root
canal treatment was started and is currently under treatment.
Discussion : Looking at trauma cases in Japan by injury mechanism, traffic accidents,
falls, and crashes/falls are common. In the present case, the patient's foot landing caused
high vertical energy to be applied to the lower limb and pelvis, followed by a hard
blow to the mandible and mandibular body by a bent knee or the ground, resulting in a
mandibular fracture, crown fracture, and root fracture of the upper and lower molars.
I will carefully continue to treat the patient and her family, not forgetting to provide
psychiatric follow-up.
Key words : High-energy trauma, Suicide attempt, Mandible fracture, Crown fracture.

− 11 −

Brief CV
Education and Academic Qualifications
1990
DDS, Fukuoka Dental College
1994
PhD, Fukuoka Dental College
Positions and Employment
1994
Hospital doctor, Fukuoka Dental College Hospital (Pediatric Dentistry)
1994-2005 Assistant, Fukuoka Dental College, Department of oral growth and development
division of Pediatric Dentistry2005-2022 Lecturer, Fukuoka Dental College, Department of oral growth and development
division of Pediatric Dentistry2022-present Associate professor, Fukuoka Dental College, Department of oral growth anddevelopment division of Pediatric Dentistry− 12 −

Yuta Inoue
Berries Clinic
E-mail : berries@i-h-implant.com

One case of dental treatment for occlusal trauma
Abstract : The patient is a 67-year-old female. She chewed her front teeth more
frequently, and was absorbed by a mating trauma that was thought to have taken moreforce than necessary, making it difficult to preserve and extract her teeth.
The treatment plan was to implant treatment. Orthodontic treatment was not hoped.
In May 2015, Pulled of lower right central and side incisor. At the same time one
implant was placed at the portion in the space lower right central and side incisor. The
implant used are BIOHORAIZONS® Tapered Internal φ3.8×15mm. An initial torquevalue of 35Ncm. The implant was covered with covering screw after placement, andGeistlich Bio-Oss® was applied to the tooth extraction cavity and the periphery of theimplant, and is closed by covering with a bioabsorbent membrane EpiGuide®.
Three months later, in August, the second operation was performed. On the same day,set temporary crown.
In October 2015, chose a threaded prosthesis for the final prosthetic.
Because I thought it was easy to clean. After the second operation, when I was using myexisting abutment, 3inOne abutment, I saw a lot of stuff stuck.
The prognosis has been favorable without any trouble for about 7 years up to date.
The patient is satisfied functionally aesthetically.
It is recommended that you check the occlusion during maintenance and use a mouse
guard.
Key words : occlusal trauma, implant treatments, bone graft

Brief CV2009
Matsumoto Dental University graduation
2009-2010 Kyushu Dental University Hospital
2010-2022 Inoue Hideto Dental Implant Clinic− 13 −

Masao Irie1）, Norihiro Sonoi2）, Hiroaki Taketa3）

1)Department of Biomaterials, Okayama University Graduate School of
Medicine, Dentistry and Pharmaceutical Science, Okayama, JAPAN
2)
Center for Education in Medicine and Health Sciences, Okayama
University Graduate School of Medicine, Dentistry andPharmaceutical Sciences3)
Department of Comprehensive Dentistry, Division of Dentistry,
OkayamaUniversity Hospital, Okayama, JAPANE-mail : mirie@md.okayama-u.ac.jp

Highly-viscous glass-ionomer cement for filling:
Interfacial Gap-formation in Class I restoration andMechanical properties
Objects : One of the major concerns with highly-viscous glass ionomer cements (HVGICs) is their ability to achieve effective initial interfacial gap-formation in restorative
cavities. This in vitro study examined the initial stage (after one-day storage) ofinterfacial gap-formation in Class I restoration together with determination of associatedmechanical properties (compressive strength and flexural strength).
Materials and Methods : Cavity preparation was made in occlusal surface of premolar
teeth. Five HV-GICs were studied (Ketac Universal Aplicap, Ketac Molar Aplicap: 3M,
Fuji IX GP, Fuji IX EXTRA, EQUIA Forte: GC, and two conventional glass-ionomer
cements (C-GICs, Ketac Silver Aplicap: 3M, Fuji II: GC, as controls), with specimen
sub-groups (n = 10 / group) for each property measured. After one-day storage andpolishing, the restored teeth were sectioned in a mesio-distal direction through thecenter of the model Class I restorations. The presence or absence of interfacial-gaps
was measured at x 1000 magnification at 14 points (each 0.5-mm apart) along the cavity
restoration interface; (n=10; total points measured per group =140). Compressive andflexural strengths were measured (n = 10 / group), as described above.
Result : For HV-GICs and C-GICs, significant differences (p<0.05) in gap-incidence
were observed. In the former case, 4-14 gaps were found. In the latter case, 21-24
gaps were observed. The compressive and flexural strengths of HV-GICs significantly
increased compared to C-GICs.
Conclusions : It is thought that a HV-GIC is the useful and significant restorative
material for some pediatric or geriatric patients.
Key words : Highly-viscous glass-ionomer cement, Filling, Interfacial Gap-formation,
Class I restoration, Mechanical properties.

Brief CV
1976-1982
1982-2007
1984-1985
2007-20162016-

Instructor, Department of Dental Material, Josai Dental University
Assistant Professor, Department of Dental Materials, Okayama University.
Visiting Researcher, Department of Dental Technology, The Royal Dental College
Copenhagen
Assistant professor, Department of Biomaterials, Okayama University Graduate
School of Medicine, Dentistry and Pharmaceutical Science.
Visiting Researcher, Department of Biomaterials, Okayama University Graduate
School of Medicine, Dentistry and Pharmaceutical Science.
− 14 −

Junya Ono1), Yoriaki Kanri1), Yasuo Okada1),
Shuji Toya2)
1)

Department of Pathology, The Nippon Dental University Schoolof Life Dentistry at Niigata
2)
Oral and Maxillofacial Surgery, The Nippon Dental University
Niigata Hospital

E-mail : johno@ngt.ndu.ac.jp

Clinicopathological studies of the vertical root
fracture of molar
Objects: To elucidate the disease conditions of the fractured and non-fractured
roots in vertical root fracture of molar, we examined the clinical characteristics andhistopathological findings of the fractured teeth and surrounding tissues.
Materials and Methods: From the vertical root fracture of molar cases archived at our
department, the recent 20 cases were selected for this study. We examined and compared
the results of H-E staining, clinical data, and radionuclide imaging findings.
Result: The majority aged in the seventies; who were considered to reflect the
population aging and the current number of teeth in Japan. Vertical root fracture occurredin mandibular molar in 18 cases and in maxillary molar in 2 cases. The fractured rootin mandibular molar was the mesial root in 10 cases, distal root in 6 cases, both mesial
and distal roots in 1 case, and fused root in 1 case. Prior treatments including root canalfilling and metal core were observed in 13 cases, and were considered to be the cause of
fracture. On the root fracture surface, bacterial contaminants were observed in 14 cases,
microfractures in 13 cases, and fibrous connective tissue in 4 cases. Around the fractured
root, radicular cysts were observed in 11 cases. In a patient with a history of taking oral
bisphosphonates for the treatment of osteoporosis, no odontoclasts were observed in
the resorption craters on the fractured surface. In the non-fractured roots, radial fissurescentered on the root canal were observed in 4 cases, and radicular cysts were foundin 1 case. Since the mandibular molar is multi-rooted tooth, even if fracture exists in
one root, there are few subjective symptoms due to the presence of non-fractured root.
Hence, patients seek dental consultation only after the symptoms have progressed, andthis poses a challenge for early diagnosis.
Key words : Vertical root fracture, molar, clinicopathological characteristics
Brief CV
Education Experience
2011 DDS, The Nippon Dental University School of Life Dentistry at Niigata
2016 PhD, The Nippon Dental University Graduate School of Life Dentistry at Niigata
Position and Employment
2016-present Assistant Professor, Department of Pathology, The Nippon Dental University
School of Life Dentistry at Niigata
Resident, Department of Pathology, The University of Tokyo
2018-20192020-present Guest researcher, Histopathology Core Facility, Faculty of Medicine, Niigata
University− 15 −

Makoto Saito
S a i t o De n t a l C l i n i c

A case of dental implant treatment for a traumatic root
fracture in ten years old on nine years later
Background: A 10-year-old man. Initial visit: December 2012. Present history: In
November 2012, He fell of tooth #11 and fractured crown and root of tooth #21 during
an exercise of the soccer. The dentist who belonged to the hospital departments ofemergency treated #11 by tooth replantation on the day. One month later, He wasreferred from the hospital department of oral & maxillofacial surgery and presented toour clinic. He and his parents requested the aesthetic restoration for his front teeth.
Treatment outcome: The tooth #21 had plural root-fracture-line in dental x-ray view.
Thus, the tooth was adaptation of the tooth extraction. The dental implant treatment is
not at 10 years old in the guidelines. When he became 19 years old, we extracted thetooth #21 and operated on the dental implant just after that. The dental implant was
finally restored with a Zirconia crown. The quantity of eruption of the tooth #11 wasshort, because the tooth root and the alveolar bone caused ankylosis. We gave a form
ideal for the tooth #11 in laminate veneer. He and his parents were satisfied with theseaesthetic treatment.
Discussion: We stored the root fracture tooth for nine years. In this way, we were able
to maintain a bone mass necessary for implant treatment.
Key words : root fracture, dental implant , replantation, ankylosis, laminate veneer

Brief CV
EXPERIENCE
Apr.1985-Present Director of Saito Dental Clinic, Private office in Izumo-shi
Apr.1982-Mar.1985 Medical doctor of Shimane Medical University Department of Oral andMaxillofacial Surgery
EDUCATION
Mar.1982 Graduate / D.D.S., Aichi Gakuin University School of Dentistry,Japan
SOCIETY
Japan Association of Dental Traumatology (Authorized Dentist and Instructor)
Japan Academy of Esthetic Dentistry (Authorized Dentist)
Society of Japan Clinical Dentistry (Authorized Dentist)− 16 −

Daishi Saito
Hanako Pediatric Dental Clinic

E-mail : ma10x.4@icloud.com

Experimental study of the diagnosis of pulp exposure byelectronic apical locator OSADA APIT
Objective: The diagnosis of pulp exposure by measuring impedance has been utilized
for more than 70 years, and we have previously reported that pulp exposure can be
diagnosed by electronic apical locator OSADA APIT
15 (OA). This time, the experiment using the model was carried out with the purpose ofclarifying the effect of the existence of the minute hole in the cavity on the OA value.
Materials & Method: An insulated coated dimple of GUTTA PERCHA GAUGE floatedon saline was used as a simulated cavity, and the minute hole (0.15 ㎜ in diameter) in
the center of dimple was considered as the foramen of pulp exposure (Experimentalgroup1). The OA value in the cavity was measured by the OA probe (0.4㎜ in diameter)with tooth paste. And, the amount of tooth paste applied to the probe was 8-fold andmeasured in Experimental group2. We also created and similarly measured the dimple
without hole (Control group), and performed t-tests for differences in the means of OA
value of each group.
Results:The means of OA value in the experimental groups were statisticallysignificantly higher than in control group (p ≦0.05).But, there were no significant
differences between the mean of the Experimental groups.
Conclusion: The morphology of the minute hole in dimple produced a constant OA
value. On the other hand, the amount of tooth paste applied to the probe made no
significant differences in the mean of the measured values. These results indicated thatthe existence of the minute hole in cavity make uniform OA value in the diagnosis ofpulp exposure by OA.
Key words : pulp exposure, impedance of tooth, electronic apex locator,
OSADA APIT15, tooth paste

Brief CV
Education Experience
2017
DDS, School of Dental Medicine, Tsurumi University
2017 -2018 Resident, Dental Hospital, Tsurumi University
2018 -2022 Research student, Graduate School, Tokyo Medical and Dental University
Position and Employment2022-present Hanako Pediatric Dental Clinic− 17 −

Yasutaka Yawaka
Dentistry for Children and Disabled Persons,
Department of Dental Functional Science,Facultyof Dental Medicine, Hokkaido University

E-mail : yawaka@den.hokudai.ac.jp

Avulsion of two upper primary incisors in earlychildhood : a case report
Background: Many cases of tooth avulsion with trauma in early childhood are different
to take care of the injured part immediately. The reasons are as follows. Primarydentition is before completion. Behavior control of early childhood is very difficult.
Situation changes significantly along with growth. Therefore, we must manage thepatient oral condition in the long term with considering the patient growth.
Case Report: Patient was an eleven-month-old Japanese boy with avulsion of upper left
central and lateral primary incisors by falling down. Erupted teeth were upper right andlower left and right primary central incisors. I explained the necessity of a long termoral management and the approach of space maintainer at the completion of primarydentition to his mother, and I got the informed consent. When he became 3 years and8 months old, his primary dentition completed. I made his removable space maintainer(R.S.M.) and he used it. Since he was very active, R.S.M. was damaged several times.
I repaired it each time. And R.S.M. was remade as he grew up. However, he used it
firmly. Therefore, it brought the space maintain of upper left incisor part, the functional
recovery on mastication and pronunciation, and the esthetic recovery to him.
Key words : primary dentition, primary incisor, avulsion, removable space maintainer,functional recovery

Brief CV
Educational background1986 DDS, Hokkaido University
1993 PhD, Hokkaido University
Professional experience
1990 – 2003
Assistant Professor, Pediatric Dentistry, Hokkaido University Dental Hospital
2003 – 2005
Lecture, Oral Rehabilitation, Hokkaido University Hospital2005 – present Professor, Dentistry for Children and Disabled Persons, Department of Dental
Functional Science, Faculty of Dental Medicine, Hokkaido University− 18 −

Takehiro Hattori
Department of Oral Pathology / Forensic
Odontology, School Dentistry,of Dentistry, Aichi
Gakuin University

E-mail : ag193d13@dpc.agu.ac.jp

Basic study of effects of irradiation with low-level LED blue
light on osteoblast-like cells derived from rat bone marrow
Recently, low level laser therapy (LLLT) has been reported to promote wound healingof fractures and tooth extraction wounds and bone-dental implants osseointegration.
In this study, we investigated the effects of LLLT on the proliferation, differentiation,and calcification of rat bone marrow–derived osteoblast-like cells using blue LED lightirradiation.
Bone marrow cells from 8-week-old male Sprague-Dawley rats were used in thisexperiment. The irradiation conditions were as follows; LED with a wavelength of
455 nm, measured value in the irradiated field: 100 mW/cm2, distance: 20.8 mm, andenergy of 5.6 J/cm2 for 14-second irradiation every 1.5 hours for up to 4.5 hours. The
experimental groups were divided into 4 groups; control group, LED group, FGF (culture
medium contains FGF 10 ng/ml) group and LED•FGF group (n=3).
The cell proliferation ability was determined immediately after the first LED irradiation,
after 1.5, 3.0, 4.5, and 12 hours by the Cell Counting Kit-8 method. The differentiation
ability was searched by measuring ALP assay kit values after 3 and 7 days after first
irradiation. And the ALP staining was also performed after 7 days, and the positivity rate
was determined from the staining area ratio. The calcification ability was determined by
Alizarin Red staining after 14 and 28 days, and the positivity rate was determined fromthe staining area ratio.
In all the searched results, both the cell proliferation and differentiation abilities werehighest in the LED group. The calcification ability tended to be slightly higher in the
FGF group than in the LED group.
In conclusion, LED blue light irradiation of cultured osteoblast-like cells was found topromote cell proliferation and differentiation compared to the addition of FGF to theculture medium.
Key words : Low level laser therapy (LLLT) , LED light irradiation , Blue light therapy,
Bone healing , Osteoblast

Brief CV
WORK EXPERIENCE
Aichi Gakuin University Dental Hospital (April 2018 – March 2019)
EDUCATION
Doctor of Dentistry, AICHI GAKUIN UNIVERSITY, Nagoya （Diploma expected 2023 ）Bachelor of Dentistry, AICHI GAKUIN UNIVERSITY, Nagoya（2018）− 19 −

Takahiro Totani1）, Keiichi Aragak2）,
Asami Higashino3）, Takuya Shimada4）,
Yasuhiro Morimoto5）, Takahide Komor6）
1)

Department of Oral Reconstruction and rehabilitation, Kyushu
Dental University
2)
Department of Oral Surgery, Okinawa Chubu Hospital
3)
Asami Dental Clinic
4)
Yamaguchi University Faculty of Medicine and Health Sciences
5)
Division of Oral and Maxillofacial Radiology, Kyushu Dental
University
6)
Department of Oral and Maxillofacial Surgery, Kobe University
Graduate School

Correlation between oral health condition and Activity of
Daily Living in elderly people requiring long-term care
Abstract;The chewing function not only fractures food but also stimulates the brain by
the feedback function and has a role of activating cranial nerves. Although it is known
that there is a deep link between health in the oral cavity and general health, there arestill few studies that gave clear evidence. Therefore, we investigated oral function
assessment and ADL in patients in our hospital, and investigated the relationshipbetween patient's oral function and QOL. As a result, there was a correlation between
the number of remaining teeth of the teeth and the degree of autonomy of the meal, theautonomy degree of the rising, the gait function, the occlusal force, and the mastication
function. When the number of remaining teeth of teeth became less than 20, functional
deterioration occurred in each item. In addition, there was correlation between chewing
function and dietary independence degree, getting up, walking function, sitting position
retention, memory ability. Interestingly, there was a marked correlation between
chewing efficiency and memory ability. The onset of dementia reduced the conditionof oral cavity cleaning and the occlusal force decreased. These results suggested thatchewing ability influences activity of brain activity.
Key words : chewing function, number of remaining teeth, general health, Activity of
Daily Living, memory ability, dementia

Brief CV
1992 Graduated from Nagasaki University of Dentistry
1999 Medical Corporation Seishinkai Mita Clinic Supervising Physician
2000 Established Totani Dental Clinic
2003 Established Medical Corporation Kouyoukai
2011- Belongs to Department of Bacteriology, Faculty of Medicine, Osaka City University
2012- Belongs to Department of Oral Reconstruction and Rehabilitation, Kyushu Dental
University
2015 Established Nagaokakyo Azalea Dental Clinic in Kyoto Prefecture2020 Established White Smile Dental Clinic in Osaka− 20 −

Qualification
M.D. (Bacteriology, Faculty of Medicine, Osaka City University)
Ph.D. (Department of Oral Implantology, Kyushu Dental University)
Japanese Society of Trauma Dentistry Supervising physician
Japanese Society of Oral Implantology Specialist− 21 −

Yoko Inoue
Fukuoka College of Health Sciences,
Department of Dental Hygiene

E-mail:inouey@fdcnet.ac.jp

A Case of Facial wounds Caused by Dog bites
Purpose: We report a case of facial laceration during an intervention of a fight between
two domesticated dogs. Case : 63-year-old male Chief complaint : Lacerations ofupper and lower lip due to dog bites Present Medical History : The patient was bitten
on the face while arbitrating a fight between two dogs at home, and visited other hospitalemergency room. He was deemed difficult to deal with, and the hospital doctor contacted
our hospital. I requested to confirm previous immunization against tetanus toxoid. Afterthe vaccination, he visited our hospital. History : #1: Laceration with left upper lip andmiddle lower lip with defect Oral Findings: Oral Findings: The wound was a contused
wound and contaminated. Wounds with laceration with defect, involving lower andupper lip and skin. Treatment and Progress : The surgical procedure was performed
under local anethesia of 1% lidocaine with adrenaline, cleaning of the surgical area andirrigation with saline solution,and debrided.Part of the lower lip was partially deficient,but was sutured with a two-layer suture. Postoperative antibiotics were administeredfor 3 days, and no postoperative infection was observed. The stitches were removed at
1 week postoperatively. Three months after treatment, there were observed with good
cosmetic and functional results. Discussion : Animal bites can cause tetanus. In Japan,
tetanus vaccination was started in 1968, and since the patient's age indicated that he may
not have been vaccinated, so visited our clinic after vaccination. In addition, animal
bites are characterized by wound contamination and tissue loss. In the present case,the defect was slight and could be treated with sutures. After suturing, a dead space
may form, and postoperative infection may occur. To prevent postoperative infection,
Prophylactic administration of antibiotics, selection of suture methods that do not createa dead space, and appropriate follow-up are considered important.
Key words : Dog bite , Tetanus vaccine , Antibiotic prophylaxis , Suturing
Brief CV
Education Experience
2000
DDS, Fukuoka Dental College
2001
Post-graduate clinical resident
2005
PhD, Fukuoka Dental College
Position and Employment
2005-2008
Hospital doctor, Fukuoka Dental College Hospital (Orthodontic)
2008-2011 Assistant, Fukuoka Dental College, Department of Oral growth and development
division of Orthodontics
2011-2016
Physician in private practice
2016-2020
Hospital doctor, Fukuoka Dental College Hospital (Oral Surgery)2020-2022 Assistant, Fukuoka Dental College, Department of Oral and Maxillofacial Surgery
division of Oral Surgery
2022-present Lecturer, Fukuoka College of Health Sciences, Department of Dental Hygiene− 22 −

Katsuyuki Yamanaka
GC Corporation
E-mail:katsuyuki.yamanaka@gc.dental

Bone formation ability of Carbonate apatite bone graft
material in different Granule sizes
Objects: Traumatic injuries due to sports or traffic accidents to maxillofacial tissues
require immediate and appropriate treatment. Although alveolar ridge preservation for
subsequent esthetic and healing purposes is necessary, there is a demand for off-theshelf bone graft material with high osteoconductivity.
By focusing on composition of native bone, we have developed a carbonate apatite bone
graft substitute (CO3Ap) (Cytrans® Granules, GC Corporation), which currently is on
the market with different granule sizes.
In this study, we investigated the rate of new bone formation between different granulesizes of CO3Ap in an animal model for alveolar ridge preservation.
Materials and Methods: Twelve-month-old male beagle mandibular premolars P2, P3,
and P4 were extracted. CO3Ap in different granule sizes (S (300-600 μm), M (6001000 μm), and L (1000-2000 μm)) were allocated to each tooth and filled up to themesiodistal surface of the extraction socket (n=3). The flap was closed at the alveolar
crest using nylon suture.
After 12 weeks of implantation, test site was removed and fixed in 10% formalin,followed by EDTA demineralization. Paraffin-embedded sliced (mesiodistal section ofroot central part) and HE stained specimens were prepared and histologically evaluatedfor bone formation.
Result: Histological evaluation indicated remaining granules, however, new boneformation was observed around the granules in a unified shape. The outer layer of the
granules was resorbed and replaced by new bone.
Granules of all sizes showed good healing results and were filled with new bone up to
the upper margin of the extraction socket. There was no significant difference in thebone formation rate due to the difference in granule size.
Conclusions: New bone formation was confirmed in all granule sizes of CO3Ap. There
was no difference in bone formation speed and amount between different granule sizes
and new bone was satisfactory and equal.
Key words : Alveolar ridge preservation , Carbonate apatite , Bone substitute,
Osteoconductivity , New bone formation.

− 23 −

Brief CV
Education Experience
1998 Bachelor of Science in Chemistry., Kanazawa University
2000 Master of Science in Chemistry., Osaka University
Positions and Employment
2000-2002
Researcher: Research and Development Department, GC Corporation.
2003-2004
Visiting scientist: Department of Dental and Medical Biochemistry, Graduate
School of Biomedical Sciences, Hiroshima University
2005-2010
Researcher: Research and Development Department, GC Corporation.
2011-2013
Senior Scientist: Research and Development Department, GC Corporation.
2014-2018
Senior Assistant Manager: Research and Development Department, GC
Corporation.
2019-present Chief Researcher (Manager): Research and Development Department, GC
Corporation.

− 24 −

Tadashi Yoshida1,2）
1)
2)

Yoshida Dental Clinic
Department of oral implantology, Kyushu
Dental University
E-mail:ydc@sakai.zaq.ne.jp

Examine the illness in the injury tooth; importanceof the cooperation
Background:In the school spot, I rack my brains about an accident and thecorrespondence of the injury tooth taking place by quarrels very much. The irreversible
illness including a tooth crown and the root fracture in the permanent tooth. In addition,
the radicular hesitation case in the deciduous dentition period may bring about
amelogenesis imperfection and the eruption imperfection of succedaneous permanent
teeth, and more careful correspondence is required. It becomes the big problem withhospital oral surgery, the medical institution which is available for injury tooth treatment
afterwards by emergency conveyance from a school continuation measures and tofollow up.
Case:The patient was born in 2002, he was 9 years boy. He felt down and get a
blow at face in playground equipment at the school 11:00a.m., on February 10, 2012.
The teeth which fell off at once by injury were four but one of four teeth was lost.
I replanted remaining three of them convalescence of luxated tooth are key by
periodontal membrane cell. This patient was already 80 minutes was past from injury,
but fortunately, as for the progress, it was good after art without wound department
infection. Because it is a 14-year-old affected child, I need I wait for a while to 18 years
old that is for the last time prosthetic measures age.
Examination:The most of the injury tooth are occurred on 4 maxillary front teeth.This
goes down due to anatomy properties of the oral cavity. As it projects as hard tissue
judging from a flank most, it is easy to receive external force.In a school, to reduce the lossof teeth due to the injury tooth ,I have the stock solution of the tooth and the observation
follow of the injury tooth patient becomes important.
Key words : Injury tooth , Complete dislocation tooth, Long-term observation

Brief CV
Experience
1993 D.D.S.,Osaka Dental University
1990 Present Director of Yoshida Dental Clinic,Private office in Sakai-city,Osaka,Japan
2016 Ph.D., Kyushu Dental University
Society
Japan Association of Dental Traumatology(Authorized Dentist and Instructor)
Japanese Society of Oral Implantology(specialist)International Congress of Oral
Implantologists(Authorized Dentist)− 25 −

Nitesh Tewari
All India Institute of Medical Sciences, New Delhi
National Centre of Excellence for Implementation of
National Oral Health Program, Ministry of Health &Family Welfare, Government of India.

Can trauma to primary teeth result in development ofdentigerous cyst? A systematic review of case reports.
Abstract:
Introduction:
Traumatic injuries of primary teeth are associated with long-term adverse consequences
affecting the succedaneous teeth. They range from yellow enamel discoloration to odontoma
like malformation or sequestration of entire tooth germ. In addition to these, there have beenreports of development of dentigerous cyst, secondary to primary tooth injury. Hence, theaim of this systematic review of literature was to explore this phenomenon and evaluate therisk factors associated with it.
Methods:
The protocol of systematic review was prepared as per the best practices of evidence-based
medicine and was registered in PROSPERO. Search strategy was formulated and conductedin 6 databases and grey literature sources. The search results were scrutinized at two levels
and data was extracted for analysis. Risk of bias was assessed by using Joanna Briggs
Institute’s critical appraisal checklist.
Results:
The 11 included articles were case reports/series and had been published in past three
decades from five countries. Complete records of injury to primary dentition were available
in five and partial in four cases. The type of injury was luxation in seven cases. Age at whichtrauma occurred was ≤4 years in majority of the cases (n=7). There were eight cases where
the cyst had affected the tooth number 11 at ages ≥7 years. The histopathological features
were reported in nine cases in a varied manner but resembled that of dentigerous cysts.
Conclusion:
Injuries of primary maxillary tooth can lead to development of odontogenic cysts associatedwith permanent teeth. This can be more common in luxation injuries in children younger
than four years and effect permanent maxillary incisors causing their dilaceration anddisplacement as well. Though this should only be regarded as preliminary evidence due tocase reports with variability being source and ROB being moderate.
Key words : Traumatic dental injury, Dentigerous cyst, Primary teeth, Long term sequelae,
systematic review

MDS, FIADT (USA), FADI (USA), FICD (USA), FDSRCPS (Glasgow)
Additional Professor
Pediatric and Preventive Dentistry
Centre for Dental Education and Research− 26 −

Director- International Association of Dental Traumatology (IADT), USA
General Secretary- Indian Society of Dental Traumatology
Standing Committee member- International Association of Pediatric Dentistry (USA)
Editor- Newsletter of Indian Society of Pedodontics and Preventive Dentistry
Dr Nitesh Tewari graduated and post graduated from prestigious King George’s Medical
University, Lucknow. He is a clinician par excellence and an academician to the core. His
academic life has been studded with a number of recognitions and awards, with post graduateteaching experience of over twelve years. Dr Tewari is an avid researcher with keen interestin the field of Dental Traumatology, Stem Cell Research and special care dentistry. He has 93
publications in reputed national and international journals and six test book contributions to
his credit till date. He has been invited as a guest speaker in over 85 events in national andinternational platforms. He was awarded with best original research award in world congress ofdental traumatology, San Diego, USA (2018), Outstanding Pedodontist Award by Craniofacial
and Research Foundation in Sri Lanka (2018), Jens Ove Andreasen Award twice at 27th and 28th
Conferences of International Association of Pediatric Dentistry (2019, 2021) and the global firstprize in original research competition in the 12th IFEA World Endodontics Congress 2021. He isa fellow of Academy of Dentistry International (USA), Japan Dental Association, International
Association of Dental Traumatology (USA), International College of Dentists (USA) andFaculty of Dental Surgery Royal College of Physicians and Surgeons (Glasgow). Presently he isworking as Additional Professor in Centre for Dental Education and Research, All India Instituteof Medical Sciences, New Delhi, serving as the Director of International Association of Dental
Traumatology and General Secretary of Indian Society of Dental Traumatology.

− 27 −

Kuniomi Nakamura
Department of Pediatric Dentistry School of Dentistry,
Kanagawa Dental University
E-mail: nakamura.kuniomi@kdu.ac.jp

Experimental root fractures by improved rat molar
luxation device
Objects: Analyzing root fractures made by applying equal loads to the bilateralmaxillary first molars in a rat using an improved rat molar luxation device.
Materials and Methods: Nineteen 5-week old male wistar rats were used. Sixteen
rats were used for experimental group and others saved as control. All rats wereanesthetized via intraperitoneal injection of chloral hydrate. After the injection, the rats
in the experimental group (n=16) were immobilized on the improved rat molar luxation
device. The rats were secured on the table, then the bilateral maxillary first molars weredislocated horizontally within 20s toward the palate with modified Hoe's pliers weighted
with 960g at rotate angle of the movable handle 3°. The control animals (n=3) were
subjected to the same procedure except for the luxation of the maxillary molars. All
the rats were killed at postoperative 2 weeks and the maxillae were dissected from therats and fixed in 4% Paraformaldehyde/Phosphate Buffer Solution. The maxillae were
scanned using 3D X-ray μCT and the presence of root fractures were determined.
Result: In several individuals, root fractures appeared. These fractures are from middle
to furcation in the mesial root. The length is about 1mm.
Conclusions: It was suggested that the improved rat molar luxation device could
produce root fractures in the molars of both sides in the same rat.
Key words : Root fracture, Traumatic injury, X-ray μCT

Brief CV
2018-present

Assistant Professor, Department of Pediatric Dentistry School of Dentistry,
Kanagawa Dental University− 28 −

Sho Odawara
Odawara Dental Clinic

E-mail:odasho@me.com

Near-infrared optical image imaging for analyzing
microcracks caused by traumatic teeth
Objects : The most common dental trauma is dislocation in deciduous teeth, whilefracture is more frequent in permanent teeth. However, it is difficult to diagnose
microcracks by visual examination, palpation, percussion, mobility testing, thermal
examination, and radiographic examination, and there are many cases in which pulp
necrosis or other problems occur during follow-up after a diagnosis of tooth concussion.
Compared to conventional optical systems that use light in the visible spectrum, NIRI
uses light in the range of 700 to 1700 nm and has superior optical characteristics.
In this study, we investigated the possibility of using NIRI to examine microcracks indental trauma.
Materials and Methods : Teeth extracted due to periodontitis, which the subjects agreed
to use for this study, were used. The crowns of the teeth were divided vertically andhorizontally with a bone chisel and mallet, and MMA resin was bonded to the crowns
to create a model of microcracks. The microcracks were diagnosed using NIRI as they
were (NIRI group) and using NIRI with ICG applied (ICG-NIRI group), respectively.
Result : Microcracks could be diagnosed by NIRI in both the NIRI and ICG-NIRI
groups. There were no significant differences in diagnosis in either the vertical or
horizontal segmentation; the contrast of microcracks was particularly clear in the ICG
group, but microcracks were difficult to identify in cases where proper cleaning was not
performed.
Conclusions : This study suggests that NIRI and ICG-NIRI are useful for the diagnosis
of dental trauma, and that NIRI imaging is useful for screening teeth with external
forces due to trauma because it is simple and non-hazardous, and the data can be easily
stored and reanalyzed. NIRI images are simple and harmless, and the data are easy tostore and reanalyze.
Key words : near-infrared imaging , NIRI, Dental Enamel , diagnostic imaging ,dental trauma

Brief CV
Education Experience
2010
DDS, Showa University
Position and Employment
2010-2013 Regident, Rakuwakai Otowa Hospital.
2013-2022 Medical staff, Division of Oral and Maxillofacial Surgery, Matsue City Hospital
2022Director, Odawara dental Clinic− 29 −

President of Asian International Association of Dental Traumatology (AADT) :Professor Emeritus Dr. Mitsutaka Kimura
Organizing Committee in JAPAN :Dr. Masao Irie, Dr. Norihiro Sonoi, Dr. Hiroaki Taketa

Asian International Association of Dental traumatology (AADT)Office :c/o Dr. Masao Irie, DDS, PhD
Dept. of Biomaterials
Graduate School of Medicine, Dentistry & Pharmaceutical Sciences Okayama
University
2-5-1 Shikata-cho, Kita-ku, Okayama
700-8525 JAPAN
Phone : +81 (0) 86-235-6668, Fax: +81 (0) 86-235-6669
e-mail : mirie@md.okayama-u.ac.jp
URL : http://www.ja-dt.org

The 10th Conference of Asian International Association of Dental Traumatology(10th AADT, Okayama)
Organizing Chairman : Dr. Masao Irie
Department of Biomaterials, Okayama University Graduate School of Medicine,
Dentistry and Pharmaceutical Science, Okayama, JAPAN
Organizing Vice-Chairman : Dr. Norihiro Sonoi
Center for Education in Medicine and Health Sciences Okayama University Graduate
School of Medicine, Dentistry and Pharmaceutical Science, Okayama, JAPAN
Organizing Secretary : Dr. Hiroaki Taketa
Department of Comprehensive Dentistry,Division of Dentistry, Okayama University
Hospital, Okayama, JAPAN
Photo by Hajime Shirai, DDS, PhD− 30 −