A2色的天然牙与成品树脂牙的同色异谱效应分析  

Metameric effect between natural teeth and resin teeth of A2 shade

作　　者：段艳玲[1] 童徐[1] 孟玉坤[2] 

机构地区：[1]口腔疾病研究国家重点实验室 四川大学,四川成都610041 [2]四川大学华西口腔医院修复科,四川成都610041

出　　处：《华西口腔医学杂志》2009年第4期417-421,共5页West China Journal of Stomatology

摘　　要：目的对A2色的天然牙和不同品牌的A2色成品树脂牙在不同光源下的颜色参数进行测量,分析其颜色变化,比较其光谱反射曲线,并分析天然牙和成品树脂牙的同色异谱效应。方法采用PR-650型光谱扫描色度仪测量A2色的天然牙和3种品牌的A2色成品树脂牙在D65光源、A光源、CWF光源和紫外光下的颜色参数L*、a*、b*值和XYZ三刺激值,比较其光谱反射曲线,通过计算特殊同色异谱指数来分析天然牙和成品树脂牙的同色异谱效应。结果A2色的天然牙和成品树脂牙的L*、a*、b*值随着光源的改变而改变,二者的变化趋势不完全一致。天然牙和成品树脂牙之间、不同品牌的成品树脂牙之间的光谱反射曲线形状有较大区别,但是每条曲线都有3个以上的交叉点和重合处,在特定光源下可以达到颜色匹配,具有同色异谱效应。A2色的天然牙与成品树脂牙之间有较明显的同色异谱效应,天然牙与3种品牌成品树脂牙之间的特殊同色异谱指数在A光源下为3.48、2.52和3.36,在CWF光源下为1.21、1.90和2.79,在紫外光下为1.59、2.07和4.07。不同品牌的A2色成品树脂牙之间的特殊同色异谱指数在A光源下为1.08、0.10和1.01,在CWF光下为1.46、2.23和0.94,在紫外光下为2.55、2.69和4.64。结论光源对天然牙和成品树脂牙的颜色有较大影响,A2色的天然牙与成品树脂牙之间存在较明显的同色异谱效应。Objective The aim of this study was to determine the metameric color differences between natural teeth and three brands of commercially available resin teeth. Methods The spectral reflectance and color coordinates of natural teeth and three brands of commercially available resin teeth of A2 shade were measured with a spectrophotometer（PR-650） according to the CIE L＊, a＊, b＊ and CIE XYZ color scale relative to illuminant D65, A, cool white fluorescent（CWF） and uhraviolet（UV）, and the metameric indices were calculated to determine the metameric color differences between natural teeth and resin teeth. Results CIE L＊, a＊, b＊ values were influenced by the type of illuminants in both natural teeth and resin teeth. The pattern of spectral reflectance curves for natural teeth and resin teeth of A2 shade were different, while there were more than three crossing points among each curves, which meant the color of natural teeth and resin teeth of A2 shade might be the same under certain illuminant. The metameric indices between natural teeth and resin teeth of A2 shade were 3.48, 2.52 and 3.36 under illuminant A; 1.21, 1.90, and 2.79 under illuminant CWF; 1.59, 2.07, and 4.07 under illuminant UV. The metameric indices between resin teeth of different brand were 1.08, 0.10, and 1.01 under illuminant A; 1.46, 2.23, and 0.94 under illuminant CWF; and 2.55, 2.69, and 4.64 under UV. Conclusion Changes in optical properties of resin teeth of A2 shade relative to the different illuminants were different from those of natural teeth, the metameric effect between natural teeth and resin teeth of A2 shade were significant. Therefore, shade matching between natural teeth and resin teeth should be performed under more than one illuminant.

关 键 词：同色异谱 天然牙 树脂牙 光源 

分 类 号：R783.1[医药卫生—口腔医学]