Novel assessment system for prosthodontic design with the fatigue fractography analysis.

通过疲劳断口分析进行修复设计的新型评估系统。

• 批准号: 14571840
• 负责人: WAKABAYASHI Noriyuki
• 金额: $ 2.11万
• 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: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571840/
• 关键词: denture; failure; stress; fracture; fatugue; finite element analysis; occiusal force; yield strength; 部分床義歯; 義歯用合金; 破壊断面; 金属疲労; チタン合金; 金合金; コバルトクロム合金; 義歯の破折

The objective of this research project was to investigate the fracture mechanics of dental alloys and polymers used in removable dental prostheses. Fracture surfaces of clinically retrieved dentures were analyzed by means of fractographic technique to correlate the location of failure in the denture structures with estimated stress distribution created in the materials used 'in the dentures. Stress distribution was calculated by the three dimensional finite element analysis for each retrieved denture structure. The stress analyses were also conducted with experimental fatigue tests for the alloys and the polymers used in the clinical dental prostheses. Results indicated that high stress area within the Ti-6A1-7Nb, Co-Cr, and gold alloy used in the denture structures coincided with their fatigue fracture locations. The probabilities of fatigue fracture and permanent deformation of the dental alloys were closely related to the material strengths and the deflections. To minimize the possibilities of fatigue failures, the denture structures should be designed with consideration of the maximum tensile stresses that are determined by the mechanical properties of the alloys and the polymers. Also, the estimation of critical occlusal loads was possible by calculating the critical stress that could induce fracture initiation in the alloys and the polymers. The results of the project strongly suggest that an innovative approach for optimizing the denture designs and evaluating new biomaterials is promising for future biomaterial design system.

本研究的目的是探讨牙科合金和聚合物的断裂力学用于可移动的牙科修复体。通过断口分析技术对临床修复义齿的断裂面进行分析，以将义齿结构中的失效位置与义齿中所用材料中产生的估计应力分布相关联。通过三维有限元分析，计算每个义齿结构的应力分布。并对临床上使用的合金和聚合物进行了应力分析和疲劳试验。结果表明，用于义齿结构的Ti-6A 1 - 7 Nb、Co-Cr和金合金内的高应力区与其疲劳断裂位置相吻合。牙科合金的疲劳断裂和永久变形的概率与材料的强度和挠度密切相关。为了最大限度地减少疲劳失效的可能性，义齿结构的设计应考虑由合金和聚合物的机械性能决定的最大拉伸应力。此外，临界咬合负荷的估计是可能的，通过计算的临界应力，可以诱导断裂开始的合金和聚合物。该项目的结果有力地表明，优化义齿设计和评估新生物材料的创新方法是未来生物材料设计系统的希望。

项目成果

Ikeda T: "Effect of cross section shape of metal strengthener on stress distribution in acrylic denture base."Prosthodont Res Pract. (in press). (2004)

Ikeda T：“金属强化剂横截面形状对丙烯酸树脂义齿基托应力分布的影响。”Prosthodont Res Pract。

Wada S: "Effect of Clasp Location in Class II RPD on Stress Distribution in Underlying Oral Mucosa."J Dent Res (special issue B). 82. B258 (2003)

Wada S：“II 类 RPD 中卡扣位置对口腔粘膜下层应力分布的影响。”J Dent Res（特刊 B）。

Ikeda T.: "Effect of cross section shape of metal strengthener on stress distribution in acrylic denture base."Prosthodont Res Pract. (Accepted).

Ikeda T.：“金属强化剂横截面形状对丙烯酸义齿基托应力分布的影响。”Prosthodont Res Pract。

Shimizu H: "Effect of metal strengthener length on stress distribution in acrylic denture base"Journal of Oral Rehabilitation. (受理).

Shimizu H：“金属强化剂长度对丙烯酸假牙基托应力分布的影响”口腔康复杂志（已接受）。

Yokoyama S: "The Influence of medial implant location in the three-unit posterior fixed partial dentures on stress distribution in the surrounding mandibular bone."J Stomatol Soc Jpn. 69(4). 263-268 (2002)

Yokoyama S：“三单元后牙固定局部义齿的内侧种植体位置对周围下颌骨应力分布的影响。”J Stomatol Soc Jpn。