摘要
目的探讨天然牙牙釉质与牙本质颜色差异,为减小全瓷修复体底层瓷与牙本质的颜色差异提供实验基础。方法利用X-rite Color i7分光光度仪分别对厚度为0.9、0.6及0.3mm的天然牙釉质、牙本质磨片(n=30)进行色度值测量与色差(ΔE)分析。结果牙釉质、牙本质明度(L*)值随厚度的减小而增大(P<0.05),红绿色品(a*)与黄蓝色品(b*)值随厚度的减小而降低(P<0.05);相同厚度的牙本质L*、a*、b*值的绝对值均大于牙釉质(P<0.05)。不同厚度的牙釉质、牙本质之间颜色存在较大差异,色差均值为5.303～13.109。随着牙釉质、牙本质厚度加大,颜色的差异逐渐增加。相同厚度的牙釉质和牙本质色差值为5.115(0.9mm)、5.855(0.6mm)、6.053(0.3mm)。结论天然牙牙釉质与牙本质的颜色差异较大,其色差随厚度差值加大而增加,牙本质较牙釉质而言更偏黄,且明度较低。因此在全瓷修复比色中需分层比色,并考虑天然牙牙本质色与底层瓷颜色的匹配性。
Objective To investigate the color differences of enamel and dentin of natural teeth, so as to lay a foundation for reducing the color differences of natural dentin and core of all ceramic restorations. Methods X-rite Color 17 Spectrophotometer was used to examine the chroma value and chromatic difference （△E） of enamel and dentin of natural teeth （thickness 0.9 mm, 0. 6 mm and 0.3 mm, n=30） . Results The L＊ values （lightness） of enamel and dentin increased with the decrease of slice thickness, and the a＊ values （red-green） and b＊ values （yellow-blue） decreased with the decrease of slice thickness （P〈0.05）. The absolute L＊, a＊ and b＊ values of the dentin were significantly greater than those of enamel of same thickness （P〈0.05）. There were great color differences between enamel and dentin of different thicknesses, with the mean △E values within a range of 5. 303-13. 109. The color difference gradually increased with the thickness increase of enamel and dentin. The △E value of the enamel and dentin of the same thickness was 5. 115 （0.9 mm）, 5. 855 （0.6 mm）, and 6. 053 （0.3 ram）, respectively. Conclusion There is noticeable color difference between the enamel and dentin of natural teeth, and the difference increases with the increase of their thickness difference. The dentin has a more yellowish color and less lightness compared with the enamel. So each laminate of all ceramic restorations needs a shade selection for all ceramic restorations, and more attention should be paid on the color matching of natural dentin and core ceramic laminate.
出处
《第二军医大学学报》
CAS
CSCD
北大核心
2013年第4期430-433,共4页
Academic Journal of Second Military Medical University
基金
国家自然科学基金(81271177)
上海市科委医学引导基金(114119a3600)
南京军区卫生专业人才122工程基金(卫综2008098)~~
关键词
牙釉质
牙本质
色差
dental enamel
dentin
eolor difference
