DIFFUSE REFLECTANCE BY ESTHETIC DENTAL MATERIALS

本研究的目的是研究的准确性和敏感性， 牙齿颜色参数测定的实验技术 临床上色彩控制是新兴的美学领域的核心 修复牙科，是一个主要的问题，目前的视觉颜色 匹配以确定患者的牙齿颜色。 在这方面所做的研究 实验室和其他机构指出，问题的主要来源是， 所需的准确度大于视觉识别的误差， 临床条件。仪器方法在以下方面并不成功： 由于直接应用光学效应， 探头的齿面和不规则的齿厚。牙齿 使色度计的样品变差。本文所研究的方法 研究结合使用颜色标准的视觉匹配来确定 近似颜色匹配沿着与光比色测量， 做最后的选择。这是该方法的一个主要简化 在先前的申请中提出，并结合了 视觉和工具方法。我们飞行员的统计数据 研究表明，CIE L*a*B* 测量仔细制作 摄影图像可用于使配对的颜色精确匹配， 从颜色样本的组。本提案的临床程序 涉及拍摄具有已知颜色参数的图像， 患者的嘴沿着与两个最接近的视觉选择的阴影引导件 色彩标准使用小型电子色度计测量 然后拍摄CIE L*a*B* 单位的照片，以将牙齿与 照片中最接近的标准。 这种技术不需要 准确的摄影色彩再现，而是基于 牙齿和颜色标准的相对测量。的假设 本研究的目的是， 摄影图像可用于选择最接近的匹配颜色 在同一张照片中。本研究的实验是 旨在实现两个目的。第一，确定最佳 用光比色法进行颜色匹配的实验条件包括 照明几何和摄影过程类型。第二个目的 是为了确定改进程序的灵敏度和准确性， 不同观察者的临床试验。实验设计包括 30名观察员和几个变量的析因实验，以确定 灵敏度、准确度和精确度。结果测量是数值CIE Δ E * 色差单位，其可以与其他研究相关， 色彩科学文献

The purpose of this research is to study the accuracy and sensitivity of an experimental technique for determining the color parameters of teeth clinically. Color control is central to the emerging field of aesthetic restorative dentistry and is a major problem with the present visual color matching for determining a patient's tooth color. Research done in this laboratory and others indicates the main source of the problem is that the accuracy required is greater than the error of visual discrimination under clinical conditions. Instrumental methods have not been successful in several studies due to optical effects arising from direct application of probes to the tooth surface and the irregular thickness of teeth. Teeth make poor samples for colorimeters. The method to be studied in this research combines visual matching using color standards for determining approximate color matches along with a photocolorimetric measurement to make the final selection. This is a major simplification of the method proposed in the previous application and combines the advantages of the visual and instrumental approaches. Statistical evidence from our pilot studies indicates that CIE L*a*b* measurements made on carefully made photographic images can be used to make accurate color matches of pairs from groups of color samples. The clinical procedure of this proposal involves photographing restorations with known color parameters in patients' mouths along with the two closest visually selected shade guide color standards. Measurements with a small electronic colorimeter on the photograph in CIE L*a*b* units are then made to match the teeth to the closest standard in the photograph. This technique does not require the accurate photographic color reproduction but instead is based upon the relative measurements of the teeth and color standards. The hypothesis of this research is that measurements of CIE color coordinates made on photographic images can be used to choose the closest matching color standard in the same photograph. The experiments in this study are designed to accomplish two purposes. First, to determine the optimum experimental conditions for color matching with photocolorimetry including illumination geometry and type of photographic process. The second purpose is to determine the sensitivity and accuracy of the refined procedures in clinical trials with different observers. The experimental designs include factorial experiments with 30 observers and several variables to determine sensitivity, accuracy and precision. The outcome measure is numerical CIE deltaE* color difference units which can be related to other studies in the color science literature.