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磨损和釉质之间的关系 结构，以及在牙形牙科牙齿中断裂的可能性。牙齿 骨折是临床上常见的问题，本研究的结果 将有助于我们理解该系统的设计和功能 人类牙齿的易损性与牙齿折断的可能性有关。拉力 力很可能导致脆性材料的断裂， 了解这些力量在地球上的位置和强度 牙釉质是决定骨折可能性的关键。这个 这项研究的结果将区分两个假设：L) 牙尖的磨损增加了牙周骨折的可能性。 通过改变牙冠中张应力的强度来修复牙列 牙釉质和尖端的保存对安全至关重要 通过牙釉质盖传导应力，或2)尖端 磨损实际上可以降低牙釉质破裂的可能性 降低或重新分布拉应力。搪瓷的研究 牙齿加载过程中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，通过牙釉质的过程也不同 因为食物的物质属性发生了变化。应变计将会是 不同发育阶段胎猪磨牙颊面贴附着剂 尖端磨损的可能性。应变计记录将在 软硬兼施刺激咬肌、咬牙。 牙釉质结构的扫描电子显微镜和光学显微镜 猪和食肉动物的牙形牙齿将决定是否有 牙釉质结构的应力相关方面之间的一致性 以及尖端磨损过程中的应力分布。这个 综合结果将确定牙齿磨损和牙釉质结构 影响牙釉质中拉力的位置和强度 帽子。