2009.08.21(Fri)
昭和歯学会誌Dental Medicine Researchへの英文抄録
Biomechanical Analysis of Implant Supported Overdentures with Magnetic Bar Attachments
Department of Geriatric, School of Dentistry, Showa University
Tomofumi Matsuhashi, Keiichiro Uchida, Yuji Sato, Noriaki Sakamoto, Gaku Inoue
Prosthodontic treatment by implant supported overdentures is effective for mandibular edentulous patients. Though various types of attachments are used, the predictability and longevity of bar attachments connected to implant bodies are excellent for clinical results. Extending the cantilever framework of bar attachments as much as possible is an important factor to increase the denture supporting ability for occlusal force. However, regarding the optimum correlation between the cantilever lengths of the four bar attachment-splinted intraforaminal implants and the force of implant loading, there are still many unclear points. So, the purpose of this study was to investigate the optimum cantilever length of implant-supported overdenture with a magnetic bar attachment by biomechanical analysis. As a result, the maximum occlusal load to support by bar attachment increased as the cantilever was extended, especially, those were more than 10 mm. On the other hand, the occlusal load was not taken identically to four implants, but the vertical loading force in the most distal implant was double, compared with the occlusal loading force. Within the limitations of this experiment, it was shown that extending the cantilever of bar attachment enabled an increase in the ability of supporting the occlusal load, but excessive extension caused over loading in a part of implant. Therefore, in case of implant-supported overdenture, it is important that occlusal force at the molar should be supported by not only implants but also denture supporting tissues.
Keywords: implant, cantilever, overdenture
