Design Optimization of Denture Prostheses by Fatigue Evaluation System

利用疲劳评估系统优化义齿修复体设计

• 批准号: 16591936
• 负责人: WAKABAYASHI Noriyuki
• 金额: $ 2.24万
• 依托单位: Tokyo Medical and Dental University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16591936/
• 关键词: denture; fracture; stress; fatigue; finite analysis; prosthodontic design; dental implant; expected life of prosthesis; レジン; ひずみ; 歯

This project was conducted to develop a design optimization system of dental prostheses including removable dentures and implant prostheses based on the evaluation of fatigue resistance. The prosthodontic design was optimized to minimize the fatigue fracture and failures in the long term clinical use of the dentures.Three categories of investigations were conducted ; 1) Fractographic analysis of clinically failed removable dentures and implant prostheses, 2) Mechanical analysis by means of finite element models of clinically failed removable dentures and implant prostheses, and 3) Fatigue tests of the removable denture and implant materials, and subsequent investigation of the correlation of the results with clinically failed dentures. In the study 2, stress distributions created in the structural components of the removable dentures and implant prostheses such as rest, major and minor connectors, clasps, interfacial region between the resin and the metal, implant neck, and implant superstructures, were analyzed by means of standardized finite element models. It was indicated in this part of the project that the clinical failure probability was closely related to the maximum tensile stress shown in the models, while the geometry and dimensions of the denture components did not necessarily cause the failure initiation. The result was confirmed by matching verification with the results shown in the study 1. In the study 3, the cause and effect relations of the tensile peak stress in the models with the failure probability of the clinically used dentures were generalized. The results of this comprehensive analysis suggest possibility of establish the design optimization system of dental prostheses based on the fatigue resistance of the denture structures. Detailed results of the analyses have been published as described in the next page. The prosthodontic design should be now systematically executed in line with the design optimization theory indicated in this project.

该项目旨在开发基于抗疲劳性评估的假牙设计优化系统，包括活动假牙和种植假牙。优化修复体设计，尽量减少义齿在临床长期使用过程中的疲劳断裂和失效。进行了三类研究； 1) 对临床失败的活动义齿和种植修复体进行断口分析，2) 通过临床失败的活动义齿和种植修复体的有限元模型进行力学分析，以及 3) 对临床失败的活动义齿和种植体材料进行疲劳测试，并随后研究结果与临床失败的活动义齿的相关性。在研究 2 中，通过标准化有限元模型分析了可摘义齿和种植修复体的结构部件（例如支架、主要和次要连接器、卡扣、树脂和金属之间的界面区域、种植体颈部和种植体上部结构）中产生的应力分布。该项目的这一部分表明，临床失败概率与模型中显示的最大拉应力密切相关，而义齿组件的几何形状和尺寸并不一定导致失败的发生。该结果与研究1的结果进行匹配验证得到证实。研究3概括了模型中拉峰值应力与临床使用的假牙失效概率的因果关系。综合分析结果表明建立基于义齿结构抗疲劳性能的义齿优化设计系统的可能性。详细的分析结果已发布，如下页所述。现在应该根据该项目中指出的设计优化理论系统地执行修复设计。

项目成果

Influence of dimension of Ti-6Al-7Nb and Co-Cr lingualbars on stress peak in underlying oral mucosa.

Ti-6Al-7Nb 和 Co-Cr 舌杆尺寸对口腔粘膜下层应力峰值的影响。

• 发表时间: 2004
• 期刊: Prosthodont Res Pract 3(1)
• 作者: 田中みか子;江尻貞一;渡邊直子;友永 章雄 他;Masataka Yoshikawa;Wada S
• 通讯作者: Wada S

Influence of dimension of Ti-6Al-7Nb and Co-Cr lingual bars on stress peak in underlying oral mucosa.

Ti-6Al-7Nb 和 Co-Cr 舌棒尺寸对口腔粘膜下层应力峰值的影响。

• 发表时间: 2004
• 期刊: Prosthodont Res Pract 3(1)
• 作者: Wada S;Wakabayashi N;Shirasu K;Ohyama T.
• 通讯作者: Ohyama T.

Prediction of permanent deformation in cast clasps for denture prostheses using a validated nonlinear finite element model

• DOI: 10.1016/j.dental.2005.10.012
• 发表时间: 2007-03-01
• 期刊: DENTAL MATERIALS
• 影响因子: 5
• 作者: Mahmoud, Ahmad Abdel Aziz;Wakabayashi, Noriyuki;Takahashi, Hidekazu
• 通讯作者: Takahashi, Hidekazu

Fatigue deflection of Ti-6Al-7Nb, Co-Cr, and Gold alloy cast clasps.

Ti-6Al-7Nb、Co-Cr 和金合金铸造扣环的疲劳变形。

• 发表时间: 2005
• 期刊: J Prosthet Dent 93(2)
• 作者: Mahmoud A;Wakabayashi N;Takahashi H;Ohyama T.
• 通讯作者: Ohyama T.

The influence of implant locations in the three-unit posterior cantilever fixed partial dentures on stress distribution in the supporting mandibular bone.

三单元后悬臂固定局部义齿种植位置对支撑下颌骨应力分布的影响。

• 发表时间: 2004
• 期刊: J Prosthet Dent 91(3)
• 作者: Kaori Sugita;Atsuko Igarashi et al.;田中みか子;大畑 昇;Srimaneepong V;Atsushi Suzuki;Kaori Sugita et al.;Tetsuya Suzuki;Yokoyama S
• 通讯作者: Yokoyama S