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.

这项研究将检查牙齿磨损、牙釉质之间的关系 结构和布诺登牙齿骨折的可能性。齿 骨折是临床常见问题，本研究结果 将有助于我们理解设计和功能如何 人类牙齿的数量与牙齿骨折的可能性有关。 拉伸 力可能会导致脆性材料断裂 了解这些力量的位置和强度 牙釉质对于确定骨折的可能性至关重要。 这 这项研究的结果将区分两个假设：l) 齿尖磨损增加了断裂的可能性 通过改变弓形齿中拉应力的强度 牙釉质和牙尖尖的保存对于“安全”至关重要 通过牙釉质帽传导应力，或 2) 尖端 磨损实际上可能会降低牙釉质破裂的可能性 减少或重新分布拉应力。 牙釉质研究 牙齿加载期间的应变将决定应力的传导方式 随着牙釉质尖端磨损的进行，通过牙釉质的方式会有所不同 随着食物的物质特性发生变化。 应变计将 贴附于不同阶段胎猪磨牙颊面 尖顶磨损。 应变计记录将在 咬肌刺激和牙齿咬硬和软食物。 扫描电子显微镜和光学显微镜观察牙釉质结构 猪和肉食动物的布诺登臼齿将决定是否有 牙釉质结构中与应力相关的方面之间的一致性 以及尖点磨损过程中的应力分布。 这 综合结果将决定牙齿磨损和牙釉质结构如何 影响牙釉质中拉力的位置和强度 帽。