FRACTURE POTENTIAL OF BUNODONT TEETH

凸齿状牙齿的骨折可能性

• 批准号: 2856643
• 负责人: TRACY E POPOWICS
• 金额: $ 3.67万
• 依托单位: UNIVERSITY OF WASHINGTON
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/2856643
• 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牙釉质之间的关系 结构，以及Bunodont牙齿中骨折的潜力。齿 断裂是一个常见的临床问题，这是本研究的结果 将有助于我们理解设计和功能 人牙的牙齿与牙齿骨折潜力有关。 拉伸 力可能会导致脆性材料和 了解这些力在 搪瓷对于确定裂缝的潜力至关重要。 这 这项研究的结果将区分两个假设：l） 牙齿尖尖的磨损增加了骨折的可能性 Bunodont牙齿通过改变拉伸应力的强度 搪瓷和尖端保存对于“安全”至关重要 通过搪瓷帽传导应力，或2）尖端 磨损实际上可能会减少牙釉质骨折的可能性 减少或重新分布拉伸应力。 搪瓷研究 牙齿载荷期间的应变将决定如何进行应力 当牙釉质尖端的磨损过程中，通过牙釉质以不同的方式通过 随着食物变化的物质特性。 应变仪将是 在不同阶段固定在胎儿猪磨牙的颊表面 尖端尖端磨损。 应变量规记录将在 咬合肌肉刺激和咬牙切齿。 扫描电子和光学显微镜 猪和食肉动物的Bunodont磨牙将确定是否存在 牙釉质结构与应力相关方面之间的一致性 随着尖峰磨损的进行，压力的分布。 这 结合结果将决定牙齿磨损和搪瓷结构 影响牙釉质中拉伸力的位置和强度 帽。