DIFFUSE REFLECTANCE BY ESTHETIC DENTAL MATERIALS

这项研究涉及到对其外观特性的研究 牙科瓷器和复合修复材料。主 重点是确定造成这些错误的大小 烤瓷全冠中牙齿颜色的复制 复合树脂是一个重大挑战。为了实现这一目标，一个 全面的过程沟通模型 牙冠和牙冠中天然牙外观特征的模拟 提出了桥梁修复的建议。 过程中每一步的误差将以以下单位估计 谢霆锋L*a*b*色差。需要研究的误差来源 包括：不同光照条件下的初始配色， 瓷器批次的变化，多层厚度，烧成条件， 银色变色和荧光。关于这一点的一个假设 研究是，初步确定患者的颜色 在整个过程中，牙齿是主要的误差来源。一个 目测法测定牙齿颜色的敏感度评价 将使用接收来估计与比色板的匹配 考虑以下因素的操作特征(ROC)统计 感官决定的偏差。此外，分辨率的限制 视觉配色系统的颜色将与颜色标准相匹配 下定决心。 对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 并与基于加法的外部估计进行比较 过程中每一步的误差估计。整体而言 这项研究的假设是，现在的准确性 由于几个阶段的累积误差，系统质量较差 高度依赖最终反馈和修正数据。 虽然目前的研究集中在复制 牙齿颜色用瓷器，获得的很多信息都会 适用于复合修复体材料的外观。 这项研究被认为是有意义的，因为尽管有一个 一致认为，目前的比色系统是 不能令人满意，没有书面证据提供依据 找回零钱。

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.