FRACTURE POTENTIAL OF BUNODONT TEETH

凸齿状牙齿的骨折可能性

• 批准号: 2634130
• 负责人: TRACY E POPOWICS
• 金额: $ 2.54万
• 依托单位: UNIVERSITY OF WASHINGTON
• 依托单位国家: 美国
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-01 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/2634130
• 关键词: Carnivora; Procyonidae; biomechanics; dental material wear; dental occlusion; dietary constituent; health behavior; light microscopy; mastication; mechanical stress; scanning electron microscopy; swine; tensile strength; tooth enamel

This study will examine the relationship between tooth wear, enamel structure, and the potential for fracture in bunodont teeth. Tooth fracture is a common clinical problem, and the results of this study will contribute to our understanding of how the design and function of human teeth are related to tooth fracture potential. Tensile forces are likely to cause fracture in brittle materials and understanding the location and intensity of these forces in the enamel is critical to determining the potential for fracture. The results of this study will differentiate between two hypotheses: l) that tooth cusp tip wear increases the probability of fracture in bunodont teeth by changing the intensity of tensile stresses in the enamel and that cusp tip preservation is vital to the 'safe' conduction of stresses through the enamel cap, or 2) that cusp tip wear may actually reduce the probability of enamel fracture by decreasing or redistributing the tensile stresses. Study of enamel strain during tooth loading will determine how stresses are conducted through the enamel differently as enamel cusp tip wear proceeds and as the material properties of food change. Strain gauges will be affixed to the buccal surface of fetal pig molars at different stages of cusp tip wear. Strain gauge recordings will be made during masseter muscle stimulation and tooth biting on hard and soft foods. Scanning electron and light microscopy of enamel architecture among the bunodont molars of pigs and carnivores will determine if there is a consistency between stress-related aspects of the enamel structure and the distributions of stresses as cusp wear proceeds. The combined results will determine how tooth wear and enamel structure affect the location and intensity of tensile forces in the enamel cap.

这项研究将探讨牙齿磨损，釉质 结构，和潜在的骨折在丘齿类牙齿。齿 骨折是临床上常见的问题，本研究的结果 将有助于我们理解 与牙齿骨折的可能性有关。 拉伸 力可能导致脆性材料断裂， 了解这些力量的位置和强度， 牙釉质对于确定断裂的可能性至关重要。 的 本研究的结果将区分两种假设：l） 齿尖磨损增加了断裂的可能性， 通过改变牙槽骨中的张应力强度， 牙釉质和牙尖保存对“安全”至关重要 应力通过牙釉质帽传导，或2）牙尖 磨损实际上可以降低牙釉质破裂的可能性， 减小或重新分布拉伸应力。 搪瓷研究 牙齿加载期间的应变将决定应力如何传导 随着牙釉质牙尖磨损的进行， 因为食物的物质属性发生了变化。 应变片将 贴附于不同时期的胎猪磨牙颊面 瓣尖磨损。 应变仪记录将在 咬肌刺激和牙齿咬硬和软的食物。 牙釉质结构的扫描电镜和光学显微镜观察 猪和食肉动物的臼齿将决定 釉质结构的应力相关方面之间的一致性 以及尖点磨损过程中的应力分布。 的 综合结果将决定牙齿磨损和牙釉质结构 影响牙釉质中张力的位置和强度 章