EFFECT OF MICROSTRUCTURE ON WEAR OF DENTAL CERAMICS

微观结构对牙科陶瓷磨损的影响

• 批准号: 6217540
• 负责人: Said Jahanmir
• 金额: $ 21.76万
• 依托单位: UNIV OF MED/DENT OF NJ-NJ MEDICAL SCHOOL
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6217540
• 关键词: biomaterial evaluation; ceramics; dental material wear; dental materials; dental stress analysis; physical property; tooth enamel

Ceramic materials are gaining a prominent position in dental applications, particularly in the restoration of crowns and occlusal surfaces. Wear of the restoration and the enamel opposing the ceramic restoration is often a key factor limiting the life of the restoration. However, the available data and information on wear performance of these materials are limited. Particularly, the effects of ceramic microstructure, oral environment, and machining on wear, and the wear behavior of natural enamel opposing the ceramic restoration, are not known. The objectives of this project are to determine the effect of microstructure on wear of dental ceramics and the opposing enamel, and to evaluate the possible effects of machining damage and environment on wear of selected dental ceramics. Six specific aims will be investigated: (1) determine the effect of microstructure on wear to define an optimum microstructure for best wear performance, (2) compare the microfracture wear mechanisms with the process of damage formation in fatigue and fracture and the material removal process in machining, (3) quantify the effects of machining damage (including surface roughness, surface integrity, and smear layers) on wear of selected dental ceramics, (4) evaluate the effect of environment (air, water, and artificial saliva) on wear of selected dental ceramics, (5) evaluate the effect of surface chemical tempering on wear of selected dental ceramics, and (6) examine wear of natural enamel tested against different ceramic microstructures in various environments. The results of this project will be instrumental in providing guidelines for selection and microstructural design of advanced dental restorative materials for an optimum performance based on wear of the restoration and the opposing natural enamel. An important issue in this research is the interplay between the effects of microstructure on wear, fatigue, and machining. Therefore, the microfracture processes involved in fatigue (Project 2) and machining (Project 1) will be compared with those observed for wear to develop some guidelines for establishing an optimum microstructure for best wear performance, without adversely affecting fatigue and machinability.

陶瓷材料在牙齿应用中占有重要地位， 特别是在恢复牙冠和咬合表面时。 穿 相对陶瓷修复的恢复和搪瓷通常是 限制修复寿命的关键因素。 但是，可用 这些材料的磨损性能的数据和信息有限。 特别是，陶瓷微结构，口服环境和 磨损时加工，自然搪瓷的磨损行为与 陶瓷修复，尚不清楚。 该项目的目标是 确定微观结构对牙科陶瓷磨损的影响和 反对搪瓷，并评估加工损坏的可能影响 和针对选定牙科陶瓷的环境。 六个具体目标 将研究：（1）确定微结构对磨损的影响 要定义最佳微观结构以进行最佳磨损性能，（2）比较 微骨折的磨损机制，其损伤形成过程 疲劳和断裂以及加工中的材料去除过程，（3） 量化加工损伤的影响（包括表面粗糙度， 表面完整性和涂片层）在选定的牙科陶瓷磨损时， （4）评估环境的影响（空气，水和人造唾液） （5）评估表面的影响 化学回火对选定的牙科陶瓷的磨损，（6）检查 对不同陶瓷微结构测试的天然搪瓷磨损 各种环境。 该项目的结果将在 提供高级选择和微观结构设计指南 牙齿修复材料，可根据磨损的磨损提供最佳性能 恢复和对立的天然搪瓷。 一个重要的问题 这项研究是微观结构对 磨损，疲劳和加工。 因此，微裂纹过程 将比较疲劳（项目2）和加工（项目1） 观察到磨损的人可以制定一些建立指南 最佳的微观结构，可最佳磨损性能，无效 影响疲劳和可加工性。