cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7773086.v1
title: The influence of three photoactivation techniques on the sorption and solubility of different composite resins

description: Abstract Introduction There is a growing demand for aesthetic restorations and the polymerized composite resins are the most used material in these procedures. In order to achieve greater resistance to solubilization proper polymerization is required. Objective Evaluate the influence of three photoactivation techniques, on sorption and solubility of three composite resins. Materials and methods 90 test samples measuring 8 mm diameter and 1 mm thick were made and divided into 9 groups (n=10) of resins -Filtek Z350 XT, Tetric N-Ceram and IPS Empress Direct, each of them was polymerized with LED Bluephase, using the techniques: Conventional, Soft-Start (SS) and Pulse Delay (PD). Afterwards they were placed in desiccator with silica gel at 98.6 F and weighed daily until obtaining a constant mass (m1). Then they were immersed in deionized water for seven days and weighed again (m2). The test sample reconditioning was performed using the m1 procedure, until a constant mass (m3 ) was obtained. The sorption and solubility values were calculated and subjected to ANOVA test (two-way), followed by Tukey post hoc, p&lt;0.05. Result There were no statistically significant differences in sorption and solubility among the studied resins when photoactivation techniques were compared. For solubility analysis, statistically significant differences were observed among the materials. The results for composite resin Filtek Z350 XT presented higher statistical hybridization values than those of the other evaluated resins. Conclusion The different forms of photoactivation had no influence on the sorption and solubility of the tested composite resins.
DOI: 10.6084/m9.figshare.7773329
title: In vitro evaluation of the effect of bleaching dentifrices containing blue covarine on bovine dental enamel

description: Abstract Introduction Blue covarine is a bleaching agent that produces optical changes on the surface of the teeth, associated with the abrasives of the dentifrice leading to tooth whitening. Objective To determine the changes in colour, roughness and mass of the bovine enamel, after simulated brushing with dentifrices - containing blue covariate bleaching - for 6, 12 and 24 months. Material and method 80 specimens were divided into 8 groups (n = 10): Control group (CG-water) and 7 test groups (TG1-Colgate Total 12, TG2-Oral-B 3D White Perfection, TG3 -Colgate Luminous Instant White, TG4-Close Up White Diamond Attraction, TG5-Close Up White Now-Glacier Fresh, TG6-Sorriso Xtreme White, TG7-Colgate Luminous White Advanced). The specimens were stained with coffee and subjected to simulated brushing for 6, 12 and 24 months. The colour, roughness and mass evaluations were performed after each brushing period. Result No dentifrice test produced significant alterations in the roughness and mass of the specimens, however, when compared to CG, all of themproduced significant whitening. The comparison of the test groups did not show a significant difference in the colour variation between TG1, TG2, TG3, TG5, TG6 and TG7 in the study. The TG4 presented a variable behavior according to time, not statistically differing from TG3 at 6, 12 and 24 months, neither from TG6 at 6 and 12 months nor from TG7 at 12 months. Conclusion The whitening effect of dentifrices containing blue covarine, after long periods of brushing, seems to be related mainly to association with mechanical bleaching agents, which, despite abrasives, did not damage the dental structure.
DOI: 10.6084/m9.figshare.7773329.v1
title: In vitro evaluation of the effect of bleaching dentifrices containing blue covarine on bovine dental enamel

description: Abstract Introduction Blue covarine is a bleaching agent that produces optical changes on the surface of the teeth, associated with the abrasives of the dentifrice leading to tooth whitening. Objective To determine the changes in colour, roughness and mass of the bovine enamel, after simulated brushing with dentifrices - containing blue covariate bleaching - for 6, 12 and 24 months. Material and method 80 specimens were divided into 8 groups (n = 10): Control group (CG-water) and 7 test groups (TG1-Colgate Total 12, TG2-Oral-B 3D White Perfection, TG3 -Colgate Luminous Instant White, TG4-Close Up White Diamond Attraction, TG5-Close Up White Now-Glacier Fresh, TG6-Sorriso Xtreme White, TG7-Colgate Luminous White Advanced). The specimens were stained with coffee and subjected to simulated brushing for 6, 12 and 24 months. The colour, roughness and mass evaluations were performed after each brushing period. Result No dentifrice test produced significant alterations in the roughness and mass of the specimens, however, when compared to CG, all of themproduced significant whitening. The comparison of the test groups did not show a significant difference in the colour variation between TG1, TG2, TG3, TG5, TG6 and TG7 in the study. The TG4 presented a variable behavior according to time, not statistically differing from TG3 at 6, 12 and 24 months, neither from TG6 at 6 and 12 months nor from TG7 at 12 months. Conclusion The whitening effect of dentifrices containing blue covarine, after long periods of brushing, seems to be related mainly to association with mechanical bleaching agents, which, despite abrasives, did not damage the dental structure.
DOI: 10.6084/m9.figshare.14327110
title: Analysis of maxillary sinus septa by cone-beam computed tomography

description: Abstract Introduction Pneumatization of the maxillary sinus may make it impossible to insert implants directly in the posterior region of the maxilla, and in these cases, the solution is to submit the patient to maxillary sinus floor augmentation surgery. The most common complication of this surgery is sinus membrane perforation. Anatomical variations of the internal space of the sinus, such as the bone septa, may further hamper detachment of this membrane. Objective To evaluate the prevalence and characteristics of sinus septa in patients from the Zona da Mata Mineira (Minas Gerais, Brazil), to offer relevant information for a safer planning of surgeries involving this region. Material and method A total of 120 patients (240 sinuses) were analyzed using cone-beam computed tomography (CBCT) images, verifying the presence of sinus septa and classifying them for size and anteroposterior location. Result Of the 120 patients analyzed, 45 (37.50%) had sinus septa, 66 septa in total. Of these, 33 (50%) were present in the middle region of the maxillary sinus and the mean septum size was 7.23 mm. There was no significant difference in the septum size between the genders or between the right and left sides. Conclusion The high rates of incidence of sinus septa justify their study, which should be based mainly on accurate exams, such as CBCT, since they represent one of the most relevant anatomical variations for the cases of sinus surgeries.
DOI: 10.6084/m9.figshare.14327110.v1
title: Analysis of maxillary sinus septa by cone-beam computed tomography

description: Abstract Introduction Pneumatization of the maxillary sinus may make it impossible to insert implants directly in the posterior region of the maxilla, and in these cases, the solution is to submit the patient to maxillary sinus floor augmentation surgery. The most common complication of this surgery is sinus membrane perforation. Anatomical variations of the internal space of the sinus, such as the bone septa, may further hamper detachment of this membrane. Objective To evaluate the prevalence and characteristics of sinus septa in patients from the Zona da Mata Mineira (Minas Gerais, Brazil), to offer relevant information for a safer planning of surgeries involving this region. Material and method A total of 120 patients (240 sinuses) were analyzed using cone-beam computed tomography (CBCT) images, verifying the presence of sinus septa and classifying them for size and anteroposterior location. Result Of the 120 patients analyzed, 45 (37.50%) had sinus septa, 66 septa in total. Of these, 33 (50%) were present in the middle region of the maxillary sinus and the mean septum size was 7.23 mm. There was no significant difference in the septum size between the genders or between the right and left sides. Conclusion The high rates of incidence of sinus septa justify their study, which should be based mainly on accurate exams, such as CBCT, since they represent one of the most relevant anatomical variations for the cases of sinus surgeries.
DOI: 10.6084/m9.figshare.9870251.v1
title: Influence of the nanometric surface topography on the primary stability of dental mini-implants

description: Abstract Introduction The physical-chemical modification of the surface of mini-implants used in the support of overdentures can influence the mechanical performance and survival of the same. Objective To evaluate the influence of a nanometric surface treatment on the mechanical performance of new mini-implant designs. Material and method 40 mini-implants (Ti-6Al-4V) with Ø 2 mm x 10 mm in length and two different designs, threaded and helical, were divided into four groups (n = 10) according to model, presence or absence of surface treatment. The mechanical performance was evaluated by means of insertion torque and pullout test in swine bony cylinders. Analysis of variance ANOVA and Tukey test, with significance of 5% were used for statistical analysis of the data. Result A statistically significant difference was observed between the groups with and without treatment for insertion torque (p &lt;0.001) and pullout test (p = 0.006), being the highest mean for the treatment group, regardless of the design. In the comparison between the designs, the thread presented a significantly higher average (p &lt;0.001) than the helicoid. Conclusion The nanometric surface treatment enabled better mechanical performance of the mini-implants evaluated. With respect to the new designs tested, the thread presented superior results to the helicoidal one.
DOI: 10.6084/m9.figshare.9870251
title: Influence of the nanometric surface topography on the primary stability of dental mini-implants

description: Abstract Introduction The physical-chemical modification of the surface of mini-implants used in the support of overdentures can influence the mechanical performance and survival of the same. Objective To evaluate the influence of a nanometric surface treatment on the mechanical performance of new mini-implant designs. Material and method 40 mini-implants (Ti-6Al-4V) with Ø 2 mm x 10 mm in length and two different designs, threaded and helical, were divided into four groups (n = 10) according to model, presence or absence of surface treatment. The mechanical performance was evaluated by means of insertion torque and pullout test in swine bony cylinders. Analysis of variance ANOVA and Tukey test, with significance of 5% were used for statistical analysis of the data. Result A statistically significant difference was observed between the groups with and without treatment for insertion torque (p &lt;0.001) and pullout test (p = 0.006), being the highest mean for the treatment group, regardless of the design. In the comparison between the designs, the thread presented a significantly higher average (p &lt;0.001) than the helicoid. Conclusion The nanometric surface treatment enabled better mechanical performance of the mini-implants evaluated. With respect to the new designs tested, the thread presented superior results to the helicoidal one.
DOI: 10.6084/m9.figshare.14327112
title: Biomechanical development and evaluation of a new framework for all-on-four rehabilitation

description: Abstract Introduction For complete rehabilitation of fully edentulous mandibles, the option for immediate loading determines the use of temporary prostheses that splint the installed implants. Although temporary prostheses with reinforcement provide rehabilitations with biomechanical benefits, the non-adoption of this recommendation coexists in different studies on immediate restorations. Objective This study evaluates a type of prosthesis to restore jaws by the all-on-four concept. Material and method: The mechanical behavior of prostheses with the modified framework was evaluated in vitro, under a cantilever mechanical unilateral bending test. Two representative groups were included in the all-on-four concept, with a G1 test group (n = 10) containing modified frameworks and a G2 control group (n = 10) that included full acrylic prostheses. The samples were submitted to thermal cycling with 500 cycles (5° ± 2 °C for 30 s, and 55° ± 2° for 30 s) and to the mechanical bending test on the cantilever. Result The Mann-Whitney test revealed a significant difference between G1 and G2 (p &lt;0.001). In the descriptive evaluation, G1 averaged 830.50 N until the initial resin fracture, while the control group presented a mean of 403.58N. The maximum resistance until complete fracture was recorded in G1, with a mean of 903.03N, while in G2, a mean of 435.20N was recorded. The linear vertical component of the flexion was 0.68 mm and 0.39 mm until the initial fracture of the bar, respectively for G1 and G2. Conclusion The modified framework for the all-on-four protocol determined better mechanical performance when compared to the same full acrylic prosthesis model.
DOI: 10.6084/m9.figshare.14327112.v1
title: Biomechanical development and evaluation of a new framework for all-on-four rehabilitation

description: Abstract Introduction For complete rehabilitation of fully edentulous mandibles, the option for immediate loading determines the use of temporary prostheses that splint the installed implants. Although temporary prostheses with reinforcement provide rehabilitations with biomechanical benefits, the non-adoption of this recommendation coexists in different studies on immediate restorations. Objective This study evaluates a type of prosthesis to restore jaws by the all-on-four concept. Material and method: The mechanical behavior of prostheses with the modified framework was evaluated in vitro, under a cantilever mechanical unilateral bending test. Two representative groups were included in the all-on-four concept, with a G1 test group (n = 10) containing modified frameworks and a G2 control group (n = 10) that included full acrylic prostheses. The samples were submitted to thermal cycling with 500 cycles (5° ± 2 °C for 30 s, and 55° ± 2° for 30 s) and to the mechanical bending test on the cantilever. Result The Mann-Whitney test revealed a significant difference between G1 and G2 (p &lt;0.001). In the descriptive evaluation, G1 averaged 830.50 N until the initial resin fracture, while the control group presented a mean of 403.58N. The maximum resistance until complete fracture was recorded in G1, with a mean of 903.03N, while in G2, a mean of 435.20N was recorded. The linear vertical component of the flexion was 0.68 mm and 0.39 mm until the initial fracture of the bar, respectively for G1 and G2. Conclusion The modified framework for the all-on-four protocol determined better mechanical performance when compared to the same full acrylic prosthesis model.
DOI: 10.6084/m9.figshare.9899726
title: Association between normative and perceived esthetic results after treatment of mandibular retrognathism

description: Abstract Introduction This cross-sectional study aimed to associate the normative cephalometric results of mandibular retrognathism treatment with patient perception on the esthetic improvement of facial profile. Objective this cross-sectional study aimed to associate the normative cephalometric results of mandibular retrognathism treatment with patient perception on the esthetic improvement of facial profile. Material and method The normative cephalometric results were obtained from lateral cephalometric radiographs of a sample of 24 Class II malocclusion patients in the pubertal growth spurt. Such patients were treated with a mandibular advancement device and evaluated by comparing pre- and post-treatment variables. The same radiographs were used to produce standardized black silhouettes that were randomly arranged. Patients were instructed to choose their preferred profile and indicate the changes perceived using a 7-point Likert scale. The data were compared with cephalometric results using a mixed-model methodology for time-repeated measures, Student’s t-test, and t-test for heterogeneous variances, at 5% significance level. Result A rate of 75% of patients preferred post-treatment silhouettes and changes were perceived regardless of the choice of either pre- or post-treatment profile. There was no significant difference between the cephalometric variables of the tracings that produced the silhouettes considered better or worse after the evaluation. Conclusion There was no association between the cephalometric results after treatment and the perception of esthetic improvement by patients treated for mandibular retrognathia.
DOI: 10.6084/m9.figshare.9899726.v1
title: Association between normative and perceived esthetic results after treatment of mandibular retrognathism

description: Abstract Introduction This cross-sectional study aimed to associate the normative cephalometric results of mandibular retrognathism treatment with patient perception on the esthetic improvement of facial profile. Objective this cross-sectional study aimed to associate the normative cephalometric results of mandibular retrognathism treatment with patient perception on the esthetic improvement of facial profile. Material and method The normative cephalometric results were obtained from lateral cephalometric radiographs of a sample of 24 Class II malocclusion patients in the pubertal growth spurt. Such patients were treated with a mandibular advancement device and evaluated by comparing pre- and post-treatment variables. The same radiographs were used to produce standardized black silhouettes that were randomly arranged. Patients were instructed to choose their preferred profile and indicate the changes perceived using a 7-point Likert scale. The data were compared with cephalometric results using a mixed-model methodology for time-repeated measures, Student’s t-test, and t-test for heterogeneous variances, at 5% significance level. Result A rate of 75% of patients preferred post-treatment silhouettes and changes were perceived regardless of the choice of either pre- or post-treatment profile. There was no significant difference between the cephalometric variables of the tracings that produced the silhouettes considered better or worse after the evaluation. Conclusion There was no association between the cephalometric results after treatment and the perception of esthetic improvement by patients treated for mandibular retrognathia.
DOI: 10.6084/m9.figshare.9899720
title: Distribution of clinical characteristics of gingival phenotype in healthy patients

description: Abstract Introduction Gingival phenotype determination enables a better understanding of intra and interindividual clinical variations in healthy periodontal tissues. Objective The aim of this study was to determine gingival phenotype profiles and compare these in different regions of the oral cavity, considering clinical parameters related to the surrounding soft tissue in the upper and lower front teeth. Material and method Ninety-one periodontally-healthy patients were examined and clinical parameters such as probing depth (PD), keratinized tissue width (KW), gingival thickness at both maxillary central incisors (GT) and gingival phenotype (GP) were determined for the upper and lower front teeth. Data were statistically analyzed by paired and independent t-Student tests, Pearson Correlation and the Chi-square test, using a significance level of 5%. Result The thick gingival phenotype predominated in the upper anterior teeth (60.5%), while the thin phenotype was more prevalent in the lower anterior teeth (84.6%). Statistically significant differences were found for keratinized tissue and gingival thickness parameters, in relation to the upper and lower gingival phenotypes (p&lt;0.05). There were no statistical significances for probing depth and gingival phenotype in the upper and lower teeth. Conclusion It was concluded that the thick phenotype is more frequent in the upper anterior teeth and that the thin phenotype is more common in the lower anterior teeth, and more frequent in males. The keratinized tissue and gingival thickness parameters proved to be suitable for the determination of gingival phenotype.
DOI: 10.6084/m9.figshare.9899720.v1
title: Distribution of clinical characteristics of gingival phenotype in healthy patients

description: Abstract Introduction Gingival phenotype determination enables a better understanding of intra and interindividual clinical variations in healthy periodontal tissues. Objective The aim of this study was to determine gingival phenotype profiles and compare these in different regions of the oral cavity, considering clinical parameters related to the surrounding soft tissue in the upper and lower front teeth. Material and method Ninety-one periodontally-healthy patients were examined and clinical parameters such as probing depth (PD), keratinized tissue width (KW), gingival thickness at both maxillary central incisors (GT) and gingival phenotype (GP) were determined for the upper and lower front teeth. Data were statistically analyzed by paired and independent t-Student tests, Pearson Correlation and the Chi-square test, using a significance level of 5%. Result The thick gingival phenotype predominated in the upper anterior teeth (60.5%), while the thin phenotype was more prevalent in the lower anterior teeth (84.6%). Statistically significant differences were found for keratinized tissue and gingival thickness parameters, in relation to the upper and lower gingival phenotypes (p&lt;0.05). There were no statistical significances for probing depth and gingival phenotype in the upper and lower teeth. Conclusion It was concluded that the thick phenotype is more frequent in the upper anterior teeth and that the thin phenotype is more common in the lower anterior teeth, and more frequent in males. The keratinized tissue and gingival thickness parameters proved to be suitable for the determination of gingival phenotype.
DOI: 10.6084/m9.figshare.9899723
title: Oral health profile of participants of an elderly cohabitation program in the state of Santa Catarina, Brazil

description: Abstract Introduction Cohabitation and social interaction programs have been shown to enhance several aspects of the quality of life of the elderly. Objective This observational study assessed the oral health and oral health perception of participants of an elderly cohabitation program in the state of Santa Catarina, Brazil. Material and method Calibrated dental students examined/interviewed 235 participants of the program. The oral examination considered Decayed, Missing, and Filled Teeth (DMFT) index, Community Periodontal Index (CPI), Periodontal Attachment Loss (PAL), use and need of prostheses, and presence of oral mucosal lesions. Oral health perception was verified with the Geriatric Oral Health Assessment Index (GOHAI) questionnaire. Data were analyzed with descriptive statistics and chi-square test (α=0.05). Result The mean DMFT index was 24.3 teeth, with emphasis on the ‘Missing’ category. Upper and lower prosthetic needs were 53.6 and 71.1%, respectively. Fifty-five per cent of participants presented oral mucosal lesions. Moderate oral health perception prevailed (43%), with mean GOHAI score of 29.9. The negative perception on physical and pain/discomfort dimensions was statistically associated with lower prosthetic need (p&lt;0.05). Conclusion The participants of the cohabitation program presented poor oral health and prevalence of moderate oral health perception. Lower prosthetic need was associated with negative perception.