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: 6270343
• 负责人: Said Jahanmir
• 金额: $ 20.93万
• 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: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 1999-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6270343
• 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.

陶瓷材料在牙科应用中占据着重要地位， 特别是在牙冠和咬合面的修复中。 磨损的 修复体和牙釉质与陶瓷修复体相对 限制修复体寿命的关键因素。 然而，可用的 有关这些材料磨损性能的数据和信息有限。 特别是陶瓷微观结构、口腔环境和 机械加工对磨损的影响，以及天然牙釉质的磨损行为 陶瓷修复体，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 相对的牙釉质，并评估加工损坏可能产生的影响 和环境对所选牙科陶瓷磨损的影响。 六大具体目标 将研究：（1）确定微观结构对磨损的影响 定义最佳微观结构以实现最佳磨损性能，(2) 比较 微断裂磨损机制与损伤形成过程 机械加工中的疲劳和断裂以及材料去除过程，(3) 量化加工损伤的影响（包括表面粗糙度、 表面完整性和涂抹层）对选定牙科陶瓷磨损的影响， (4)评价环境（空气、水、人工唾液）的影响 对所选牙科陶瓷的磨损，（5）评估表面的影响 对选定牙科陶瓷的磨损进行化学回火，以及 (6) 检查 针对不同陶瓷微观结构测试天然牙釉质的磨损 各种环境。 该项目的成果将有助于 为先进材料的选择和微观结构设计提供指导 牙科修复材料可根据磨损情况提供最佳性能 修复体和相反的天然牙釉质。 一个重要问题在 这项研究是微观结构的影响之间的相互作用 磨损、疲劳和机加工。 因此，微断裂过程 涉及疲劳（项目2）和加工（项目1）将进行比较 与那些观察到磨损的人一起制定一些指导方针 最佳的微观结构可实现最佳的磨损性能，而不会产生不利影响 影响疲劳和切削加工性。