摘要
目的:比较天然牙牙釉质和牙本质与Vita饰面瓷的半透性差异。方法:制备0.8mm的牙釉质切片和1.0mm牙本质切片各32例,制作厚度1.0mm的Vita釉瓷EN1、EN2,透明瓷T4、Window,体瓷A1、A2、A3、A3.5、A4、B2、C2、D2试件,每组各3个。用PR-650光谱扫描色度仪分别测量牙体组织切片和瓷片试件的透射率、反射率,计算透射系数。采用SPSS12.0软件包计算牙釉质和牙本质透射系数的95%可信区间,使用SNK法对不同色相和饱和度的体瓷的透射系数进行两两比较。结果:牙釉质的透射系数范围为0.0817～0.1009mm-1,高于2种釉瓷的透射系数(分别为0.0507mm-1和0.0408mm-1)。牙本质的透射系数范围为0.0418～0.0482mm-1,高于体瓷的透射系数(0.016mm-1～0.027mm-1)。随着饱和度的增大,体瓷试件的透射系数下降(P<0.05)。结论:Vita饰面瓷与牙体组织的透射性能有明显差异,尤其以釉瓷和牙釉质的差别最大。
PURPOSE： To compare the translucency between enamel, dentin and dental porcelain. METHODS： 32 newly extracted vital human central incisors were collected and cut into 0.8mm enamel slices and 1.0ram dentin slices. 1.0mm dental porcelain specimen were made with different Vita veneer porcelain, EN1, EN2, T4, Window, A1, A2, A3, A3.5, A4, B2, C2, D2, 3 samples for each kind.The transmittance and reflectance of tooth slices and porcelain specimen were measured by PR-650 spectra scan spectrocolorimeter. The transmittance coefficients were also calculated. The 95% confidence interval was obtained by SPSS 12.0 software package. SNK method was used to compare the transmittance coefficients of different dentin porcelains. RESULTS： The transmittance coefficient of tooth enamel ranged from 0.0817mm^-1 to 0.1009mm^-1, which was higher than that of two kinds of enamel porcelain （0.0507mm^-1 for EN1 and 0.0408mm^-1 for EN2）. The transmittance coefficient of dentin （0.0418-0.0482 mm^-1） was also higher than that of dentin porcelain （0.016-0.027 mm^-1）. The transmittance coefficient of dentin porcelain decreased with the increasing of chroma （P〈0.05）. CONCLUSIONS： Prominent difference exists between translucency of tooth tissue and dental porcelain, especially between enamel and enamel porcelain.
出处
《上海口腔医学》
CAS
CSCD
2007年第6期640-643,共4页
Shanghai Journal of Stomatology
关键词
半透性
透射系数
牙釉质
牙本质
饰面瓷
Translucency
Transmittance coefficient
Enamel
Dentin
Veneer porcelain
