DIFFUSE REFLECTANCE BY ESTHETIC DENTAL MATERIALS

本研究的目的是研究其准确性和敏感性。 一种测定牙齿颜色参数的实验技术 从临床上看。色彩控制是新兴的美学领域的核心 修复牙科，是目前视觉色彩的主要问题 用于确定病人牙齿颜色的配对。在这方面做的研究 实验室和其他机构表示，问题的主要来源是 要求的准确度大于视觉辨别的误差 临床情况。仪器方法在以下方面尚未成功 由直接应用产生的光学效应引起的几个研究 探头探测牙齿表面和牙齿的不规则厚度。牙 为色度计制作劣质样品。本课题拟研究的方法 研究结合视觉匹配使用颜色标准来确定 近似颜色匹配以及光比色测量以 进行最终选择。这是对该方法的一个重大简化。 在上一个应用程序中提出，并结合了 视觉和工具方法。我们飞行员提供的统计证据 研究表明，CIE L对*a*b*的测量是精心制作的 摄影图像可以用来进行精确的配色 从颜色样本组中选择。这项建议的临床程序 涉及使用已知的颜色参数拍摄修复 患者的嘴巴和两个最接近的视觉选择的比色板 颜色标准。用小型电子色度计测量 照片中的L*a*b*单位随后被制作成将牙齿与 照片中最接近的标准。此技术不需要 准确的摄影色彩再现，但基于 牙齿的相对测量和颜色标准。的假说 本研究的目的是对CIE颜色坐标进行测量 可以使用摄影图像来选择最匹配的颜色 同一张照片中的标准图片。这项研究中的实验是 旨在实现两个目的。首先，确定最优的 光比色法配色的实验条件包括 照相过程的照明几何和类型。第二个目的 是为了确定精细化程序的敏感性和准确性 不同观察者的临床试验。实验设计包括 30个观察者和几个变量的析因实验以确定 灵敏度、准确度和精密度。结果衡量标准是数字CIE DeltaE*色差单位，可与 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.