Biomechanical Analysis of Cantilever Length with Magnetic Bar Attachments for Implant-supported Overdentures

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  • MATSUHASHI Tomofumi
    Department of Geriatric Dentistry, Showa University School of Dentistry
  • UCHIDA Keiichiro
    Department of Geriatric Dentistry, Showa University School of Dentistry
  • SATO Yuji
    Department of Geriatric Dentistry, Showa University School of Dentistry

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Other Title
  • 磁性バーアタッチメントを用いたインプラントオーバーデンチャーのカンチレバーの長さに関するバイオメカニクス的解析
  • ジセイ バーアタッチメント オ モチイタ インプラントオーバーデンチャー ノ カンチレバー ノ ナガサ ニ カンスル バイオメカニクステキ カイセキ

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Prosthodontic treatment by implant-supported overdentures is effective for edentulous patients. In the past, cantilever length of bar attachments connected to implant bodies was often determined based on clinical experience and have not been well reported based on scientific basis. Hence, the objective of the present study is to establish the guidelines for ideal cantilever length in implant-supported overdentures with magnetic bar attachments using three-dimensional geometric analysis from the view point of biomechanics.<br/>Six patients (12 samples) with implant-supported overdentures which were supported by four implants between the mental foramina on edentulous mandibles participated. Initially, we made silicone models that reproduced denture supporting tissues and bar attachments, and photographed these with certain specifications. Next, we gradually analyzed of occlusal loading for the overdenture, the bar attachment, and the implant in situation of loading at first molar by using them. After that, we examined about the loading force in case of capsizing and parting the bar attachment and overdenture by three-dimensional geometric analysis in simulation of extending the distance from the most distal point of the cantilever by 1 mm.<br/>Consequently, it was suggested to become the more different loading distribution on each implants, the more the occlusal loading increased to the implant. Moreover, it was clearly that the more it extended the cantilever of bar attachment, the more loading distribution on each implants were significant difference. Especially, it was indicated that the vertical load about 2.7 times occlusal force for the most distal implant which supported bar attachment. Furthermore, extending the cantilever of bar attachment was unable to support occlusal force, more than 10 mm, without capsizing overdenture.<br/>Cantilever is very effective in increasing the supporting ability to occlusal force, but it was necessary to require 10 mm at least to support occlusal force on the first molar only by barattachment with implants placed between mental foramens. So it is important that occlusal force at the molar should be supported by not only implants but also denture supporting tissues.

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