The 23rd International Conference on Magnetic Applications in Dentistry (Feb. 26 to Mar 15, 2024)
http://jsmad.jp/international/23/

A case report of removable partial dentures using magnetic attachmentsfor problematic dental implants
Mineyo. SONE, Kenji AOKI, Daikei MATSUMOTO, Yuki TANIUCHI, Mie NUMAZAWA，Fumiko
NARUMI, Natsumi KOYAMA and Kazuhiko OKAMOTO
1Division of Removable Prosthodontics, Department of Restorative and Biomaterials Sciences, Meikai
University School of Dentistry

Abstract
In this presentation, we report on a case in which occlusal reconstruction was performed by attachingdentures with different types of magnetic attachments for problems after oral implant placement.
The patient, a 66-year-old female, complained of aesthetic dissatisfaction and masticatory dysfunction.
Six years earlier, she had undergone full-mouth rehabilitation—including implant treatment at a local
clinic—and had been doing well since that time. However, one year earlier, a root fracture had occurredin the teeth opposite the implant placement site. It was suggested that she have the fractured teeth extracted
and wear telescopic crowns using the implant as an abutment. The superstructure was removed, but theabutment screw broke during the procedure. Therefore, the patient visited the department of prosthodontics
at our university hospital.
As a result of treatment, a maxillary definitive prosthesis was fabricated with a non-palatal overdenture
using a coping type and an extracoronal magnetic attachment. A mandibular definitive prosthesis wasfabricated with a partial denture with an extracoronal magnetic attachment, and the implant abutments
were coated under the denture base.

Introduction
In recent years, implant treatment has been an effective option widely used for partial dentition defects.
However, there are still many problems after the procedure, such as damage to the superstructure. In thispresentation, we report on a case in which occlusal reconstruction was performed by attaching dentureswith different types of magnetic attachments for problems after oral implant placement.

Clinical History
Clinical History: The patient, a 66-year-old female, complained of aesthetic dissatisfaction andmasticatory dysfunction.
Six years earlier, she had undergone full-mouth rehabilitation including implant treatment at the local
clinic and had been doing well since that time. However, one year earlier, a root fracture had occurred in
the teeth opposite the implant placement site. It was suggested that she have the fractured teeth extracted
and wear the telescopic crowns using the implant as an abutment. The superstructure was removed, but
the abutment screw broke during the procedure. Therefore, she visited the Department of Prosthodontics
at the University Hospital because she did not trust the local clinic.
Already, provisional restorations were placed in the oral cavity. In addition, the left middle incisor of theupper jaw was left in the residual root state. An implant was placed in the lower jaw in the bilateral molararea. However, on the left side, the superstructure had already been removed, and the screw hole was foundto be frustrated (Fig. 1).

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The 23rd International Conference on Magnetic Applications in Dentistry (Feb. 26 to Mar 15, 2024)
http://jsmad.jp/international/23/

Fig. 1 Intraoral view at the first visit
Figures 2 and 3 show a dental X-ray and the results of the periodontal disease examination. As for theremaining teeth from the test results, the crown–root ratio was somewhat poor in the whole jaw; however,there was no transmission image at the root apex, and there was no periodontal pocket of 4 mm or more.

BOP
Mobility
PCR
EPP(mm)Location
EPP(mm)PCR
Mobility
BOP

Fig. 2 X-ray photographs
at the first visit

87564

5
30

0

0

0

0

000

3
4

3
32322212
110002320

4

563

730
○0○8Fig. 3 Periodontal disease examination at the first visit

There were three requests from patients: “I want to have a prosthetic dental treatment with less discomfort
in the oral cavity and consideration for aesthetics,” “Because of this trouble I’ve had, I want you to stop
the prosthetic intervention in the implant part,” and “I want you to move to the final prosthetic device
because the jaw position established in the current provisional restoration is very favorable.” Finally, wesuggested that removable partial dentures using magnetic attachments be fabricated, which the patient
found acceptable.
Treatment Procedure: Based on dental X-ray photographs and periodontal disease examination, the distalroot of the maxillary left middle incisor was fitted with a coping magnetic attachment (Fig. 4), in
consideration of its load-bearing capacity as an abutment tooth. We decided to fabricate an extracoronalmagnetic attachment using an EC Keeper Tray (GC, Japan) for the maxillary right first premolar and themandibular left canine (Figs. 5 and 6).

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The 23rd International Conference on Magnetic Applications in Dentistry (Feb. 26 to Mar 15, 2024)http://jsmad.jp/international/23/

Fig. 4 Coping typeof magnetic attachment

Fig. 5 Extracoronal magnetic attachment

After fixing the coping magnetic attachment to the oral cavity, a pick-up impression was taken in theoral cavity for making a working model, and wax dentures were fabricated on it (Figs. 6 and 7).

Fig. 6 Pick-up impression

Fig. 7 Wax denture

As a result of treatment, a maxillary definitive prosthesis was fabricated with a non-palatal overdenture
using coping and extracoronal magnetic attachments. A mandibular definitive prosthesis was fabricatedwith a partial denture with extracoronal magnetic attachment, and the implant abutments were coatedunder the denture base (Figs. 8 and 9).

Fig. 8 definitive prostheses[Web Presentation] PS2-4-3

The 23rd International Conference on Magnetic Applications in Dentistry (Feb. 26 to Mar 15, 2024)
http://jsmad.jp/international/23/

Fig. 9 Intraoral view with definitive prostheses

Conclusion
A magnetic attachment could be provided as a means for alleviating patient concerns regarding
aesthetics and functions. As a result, OHIP-14, which is related to QOL, improved from 25 points to 6points.
5646
3626
16

Preoperative
Postoperative

2566-4Fig. 10 OHIP-14

It is difficult to maintain an ideal combination of aesthetics and functionality because the design of a final
prosthesis is complex.1) Therefore, continuous follow-up is necessary with occlusal adjustment andrelining of the denture base. In addition, periodontal management and force control of the remaining
dentition should be evaluated during the maintenance program.

References
1.

M. SONE, H. HAMASAKA, Y. OKAWA, S. SOMEKAWA, M. MASUDA, A. MATUI, Y.
TOYOTA, F. OKUTSU, T. MATSUKAWA, K. OKAMOTO and S. OHKAWA: Relationshipbetween denture design and prognosis in removable denture using magnetic attachments. JJ Mag
Dent, 24(1), 68-77, 2015

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