FAILURE ANALYSIS OF DENTAL RESTORATIONS

牙齿修复的失败分析

• 批准号: 6760211
• 负责人: Janet B Quinn
• 金额: $ 11.09万
• 依托单位: AMERICAN DENTAL ASSOCIATION FOUNDATION
• 依托单位国家: 美国
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2006-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6760211
• 关键词: biomaterial compatibility; biomaterial evaluation; ceramics; dental implants; dental material wear; dental research; dental stress analysis; dental structure; fracture fixation; hardness; mechanical pressure; porcelain; scanning electron microscopy; surface coating; surface property

DESCRIPTION: (provided by applicant) The candidate?s long-term objective is to become a respected research scientist in the field of biomaterials, with more immediate goals of contributing to a theoretical understanding and practical development of dental materials. This proposal will enable her to apply her training and experience to build a knowledge base in dental material failure analysis and fractography. The work will be conducted at the Paffenbarger Research Center, which has nurtured many successful independent researchers by providing an environment of motivated, encouraging professionals, state-of-the art experimental facilities, individual and formal educational instruction, and personal mentoring. The proposed project is in response to a need for a science-based analysis of the failure of dental restorations. This study will utilize material properties, novel testing techniques and fractography in an interdisciplinary approach to determine failure causes in commercial and model dental materials. In Aim 1, strength and toughness parameters are obtained with newly developed standardized tests. Clinical relevancy is attained through strength distributions and fractographic correlations between test samples and failed restorations. In Aim 2, the new edge toughness test quantitatively ranks materials according to chipping susceptibility, and enables back-calculation of force values that cause chipping by edge-chip dimensional measurements. Aim 3 evaluates techniques, such as dyes, oblique lighting and computerized data collection, for identifying fractographic features in dental ceramics. There are currently no guidelines for fractographic analysis specific to this class of materials. The restoration fractographic analysis in Aim 4 enables controversies on the location of fracture initiation to be resolved, and failure causes and progression to be determined. Aim 5 sets up an accessible database of critically evaluated dental material properties. Currently, it is not possible to compare property values among dental materials because of the different test parameters used by investigators in this field. The achievement of the stated aims will constitute the establishment of a failure analysis technology that will benefit every aspect of the restoration industry, including design, processing, clinical procedures and placement, and mechanical testing and standards development.

描述：（由申请人提供）候选人的长期目标是 成为生物材料领域受人尊敬的研究科学家，拥有更多 促进理论理解和实践的近期目标 牙科材料的开发。该提案将使她能够申请 建立牙科材料失效知识库的培训和经验 分析和断口分析。这项工作将在 Paffenbarger 进行 研究中心，培养了许多成功的独立研究人员 提供一个充满动力、鼓舞人心的专业人士、最先进的环境 艺术实验设施、个人和正规教育指导，以及 个人指导。 拟议的项目是为了满足对以下问题进行基于科学的分析的需求 牙齿修复失败。本研究将利用材料 跨学科的特性、新颖的测试技术和断口分析 确定商业和模型牙科材料失败原因的方法。 在目标 1 中，使用新开发的材料获得强度和韧性参数 标准化测试。临床相关性是通过实力获得的 测试样品和失败样品之间的分布和断口相关性 修复。在目标 2 中，新的刃口韧性测试定量排名 根据崩落敏感性计算材料，并能够反算 通过边缘芯片尺寸测量导致碎裂的力值。目标 3 评估技术，例如染料、倾斜照明和计算机数据 系列，用于识别牙科陶瓷的断口特征。那里 目前没有针对此类的断口分析指南 的材料。 Aim 4 中的修复体断口分析使 关于断裂起始位置的争议有待解决，以及 失败原因和进展待确定。目标 5 建立一个无障碍的 经过严格评估的牙科材料特性数据库。目前，它是 无法比较牙科材料之间的属性值，因为 该领域的研究人员使用不同的测试参数。 实现既定目标将构成建立一个 故障分析技术将有利于修复的各个方面 行业，包括设计、加工、临床程序和安置，以及 机械测试和标准制定。