DIFFUSE REFLECTANCE BY ESTHETIC DENTAL MATERIALS

本研究涉及的外观特性的研究， 牙科陶瓷和复合修复材料。 主要 重点是确定误差的大小， 瓷冠中牙齿颜色的重复， 复合树脂是一大挑战。 为了实现这一目标， 全面的沟通模式的过程中， 天然牙牙冠外形特征的模拟 提出了桥梁建设。 过程中每一步的误差将以 CIE L*a*B* 色差。 要研究的误差来源 包括：不同光照条件下的初始配色， 陶瓷批料变化，多层厚度，烧制条件， 银变色和荧光。 其中一个假设是 研究表明，患者皮肤颜色的初步确定 齿是整个加工过程中的主要误差源。 一个 牙体颜色目测敏感性的评价 将使用接收到的颜色来估计与阴影引导的匹配。 工作特性（ROC）统计，考虑到 感官判断的偏差 此外， 颜色的视觉匹配系统与颜色标准将 测定 系统误差的总体估计为： 使用先前测试的方法通过实验确定 并与基于增加的外部估计进行比较， 过程中每一步的误差估计。 整体 这项研究的假设是，目前的准确性 系统由于在几个阶段的累积误差而很差， 高度依赖于最终的反馈和校正数据。 虽然目前的研究集中在重复的 牙齿颜色与瓷器，获得的大部分信息将是 适用于复合修复材料的外观。 这项研究被认为是重要的，因为虽然有一个 一致认为，目前的色调匹配系统是 不满意，没有书面证明提供依据 换零钱

This research involves research on the appearance properties of dental porcelain and composite restorative materials. The main focus is to determine the magnitude of the errors which make duplication of the color of teeth in porcelain crowns and composite resins a major challenge. To accomplish this goal, a comprehensive communication model for the process of the simulation of natural tooth appearance properties in crown and bridge restorations is proposed. The error in each step in the process will be estimated in units of CIE L*a*b* color difference. The sources of error to be studied include: initial color matching under different lighting conditions, porcelain batch variations, multilayer thickness, firing conditions, silver discoloration and fluorescences. One hypothesis of this study is that the initial determination of the color of the patient's teeth is the major source of error in the whole process. An estimate of the sensitivity of determining tooth color by visual matching with a shade guide will be estimated using receiving operating characteristic (ROC) statistics which take into account the bias of sensory decisions. Also, the limiting resolution of color of a visual matching system with color standards will be determined. The overall estimate of the error of the system will be determined experimentally using previously tested methodology and compared with an external estimate based upon the addition of the error estimates for each step in the process. The overall hypothesis of this research is that the accuracy of the present system is poor due to cumulative errors at several stages and is highly dependent on the final feedback and correction data. Although the present research concentrates on the duplication of tooth color with porcelain, much of the information gained will be applicable to the appearance of composite restorative materials. The research is considered significant since although there is a consensus that the present system of shade matching is unsatisfactory, there is no documented proof to provide a basis for change.