BIOMECHANICAL STUDIES OF ENDODONTICALLY TREATED TEETH

牙髓治疗牙齿的生物力学研究

• 批准号: 3425333
• 负责人: HAROLD H MESSER
• 金额: $ 1.91万
• 依托单位: UNIVERSITY OF MINNESOTA
• 依托单位国家: 美国
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-01 至 1990-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3425333
• 关键词: biomechanics; bite strength; dental prosthesis; dental pulp; dental stress analysis; endodontics; mastication; root canal therapy; tooth

Endodontically treated teeth are susceptible to fracture, and their restoration often poses a challenge to the restorative dentist. This susceptibility to fracture has been generally ascribed to increased brittleness and to the loss of tooth structure resulting from caries, endodontic access preparation and instrumentation. Limitations of testing techniques, generally involving loading to fracture, have hampered the systematic assessment of the contributions of the various steps in endodontic and restorative procedures, to overall loss of tooth strength. Strain gauge technology, in association with closed-loop servohydraulics, offers considerable advantages in the non- destructive measurement of loss of strength at each stage of endodontic and restorative treatment of teeth. Strain gauges bounded to enamel measure the flexure of the tooth under lad, and the closed-loop servohydraulic system permits controlled loading of the tooth under conditions of static load or simulated functional and parafunctional movements. Because the tooth is not stressed to the point of fracture, multiple measurements can be made on each tooth; the loss of stiffness associated with each step in the endodontic and restorative procedures and the regaining of stiffness with placement of an appropriate restoration, can be measured with each tooth serving as its own control. This pilot study is planned to investigate the feasibility of using multiple strain gauges on single extracted teeth, to measure the effects of endodontic and restorative procedures on loss of tooth strength. Placement of gauges on buccal, lingual and proximal surfaces will allow the simultaneous measurement of flexure in different locations, in response to static loading and to chewing and bruxing cycles. The extent and the nature of the strains (either tension or compression) in different locations, and their potential contribution to fracture susceptibility will permit a more rational approach to design of cavity preparations and restoration of endodontically treated teeth. This approach has potential application to many aspects of the restoration of endodontically treated teeth, including the design and placement of posts and pins, and the use of dentin-bonded restorative materials.

根管治疗的牙齿容易骨折， 修复经常对修复牙医提出挑战。 这种对断裂的敏感性通常归因于 增加的脆性和牙齿结构的损失， 从龋齿，牙髓通路准备和仪器。 测试技术的局限性，通常涉及加载到 骨折，阻碍了系统的评估， 根管治疗和修复中各个步骤的贡献 手术，牙齿强度的整体损失。 应变片技术，与闭环技术相结合 伺服液压，提供了相当大的优势，在非 破坏性测量强度损失的每个阶段， 牙齿的根管治疗和修复治疗。 应变仪 结合到釉质测量牙齿在LAD下的弯曲， 闭环伺服液压系统允许控制 在静载荷或模拟载荷条件下对牙齿施加载荷 功能性和副功能性运动。 因为牙齿是 没有应力到断裂点，多次测量可以 每一颗牙齿上都有一颗牙齿，每一颗牙齿上都有一颗牙齿。 根管治疗和修复程序中的步骤以及 通过放置适当的 修复，可以测量每颗牙齿作为自己的 控制 这项试验性研究计划调查使用 多个应变片在单个拔出的牙齿上，以测量 根管治疗和修复对牙缺失的影响 实力 在颊侧、舌侧和近端放置量规 表面将允许同时测量弯曲 不同的位置，响应静态载荷和咀嚼 和磨牙周期。 紧张的程度和性质 （拉伸或压缩）在不同的位置， 对断裂敏感性的潜在贡献将允许 更合理的方法来设计窝洞制备， 根管治疗牙齿的修复。 这种方法有 潜在的应用到许多方面的恢复 根管治疗的牙齿，包括设计和放置 以及牙本质粘结修复体的使用 材料.