Study of Development of Haze Scale for Tooth Crown

修复体的美学接受度受很多因素的影响，例如：例如，颜色及其色调、明度和色度要素;透明度和不透明度;光透射和散射;光泽;深层成分;表面纹理;同色异谱;荧光。人们曾多次尝试再现天然牙齿的光学特性。牙冠的光透射率是其光学特性之一，也称为透光度或透射雾度。这种性质可以被准确和有意义地描述，更重要的是，它可以被分析，它和另一种半透明性之间的差异可以被理解和指定。目前还没有一种可接受的牙齿半透明测量系统。半透明性的辨别意味着感知两种半透明性质之间的差异。本文报道了在制作一套实用的牙科标准半透明导板之前，对20名男女学生、口腔医学家和牙科医生进行的牙冠半透明性判别阈值和个体差异的实验结果。他们年龄在18到30岁之间，没有三色视者。根据霾比较原理，采用配对差异检验方法，对霾差异的判别能力进行了检验。受试者的实际最小可感知混浊差异的阅读平均值为0.76%。最大值和最小值分别为1.4%和0.3%。一般来说，雾度差异越大，越容易区分，但发现情况并非总是如此。

The esthetic acceptance of a restoration, fabricated to replace or restore a missing or diseased tooth, is Influenced by a great many factors, I. e., color and Its elements of hue, value and chroma ; translucency and opacity ; light transmission and scattering ; gloss ; deep components ; surface texture ; metamerism ; and fluorescence.There have been many attempts to reproduce the optical properties of natural teeth. One of the optical properties is luminous transmittance of tooth crown, that is also called translucency or transmission haze. This property can be accurately and meaningfully described, and even more important, it can be analyzed, and the differences between it and another translucency can be understood and specified.There is not yet an acceptable translucent measurement system for teeth. The discrimination of translucency means perception of the difference between two translucent properties. Before the manufacture of a set of the available dental standard translucent guides, the results of the experiments on the discrimination threshold for translucency of tooth crown and individual variation are reported in this study.The subjects were a total of 20 male and female students, oral hygienists and dentists. They were from 18 to 30 years old and had no trichromat. The ability to discriminate haze difference was examined according to the principle of haze comparison by the paired difference test.The following results were obtained :1. Reading average for the actual least perceptible haze difference of subjects was 0.76%. And the greatest and least value were 1.4% and 0.3%.2. In general, the larger the haze difference is, the more easily it can be discriminated, but this was found to be not always the case.