不同牙本质瓷表面纹理对瓷试件光学性能的影响。

Influence of varied surface texture of dentin porcelain on optical properties of porcelain specimens.

机构信息

State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China.

出版信息

J Prosthet Dent. 2011 Apr;105(4):242-8. doi: 10.1016/S0022-3913(11)60039-5.

DOI:10.1016/S0022-3913(11)60039-5

PMID:21458649

Abstract

STATEMENT OF PROBLEM

Differences in the texture of dentin porcelain surfaces may change the direction of incident light at the enamel-dentin porcelain interface and affect the optical properties of a ceramic crown.

PURPOSE

The purpose of this study was to measure optical parameters of enamel-dentin porcelain complexes with different dentin porcelain surface textures, and to analyze the relationship between optical parameters and surface texture.

MATERIAL AND METHODS

Eighty dentin porcelain (ShoFu Vintage Halo, shade A2) disks (1.0 × 10.0 mm) were fabricated and assigned to 10 groups (n=8). The dentin porcelain specimens were given different surface textures with modified surface roughnesses (Ra) and different levels of waviness (Wa). Measurements of transmittance, reflectance, and CIE Lab* values were made with a spectrocolorimeter (PR-650) after standard finishing of the enamel-dentin porcelain complex. Translucency parameters (TP) and color difference (ΔE) were calculated with CIE Lab* values, respectively. The data were statistically analyzed by 1-way ANOVA and Fisher's LSD (least significant difference) post hoc tests (α=.05).

RESULTS

Transmittance, reflectance, and the translucency parameter were influenced significantly by surface roughness (P<.05) and waviness values (P<.01). With a decrease in the Ra value from 1.23 μm to 0.15 μm, mean reflectance values increased from 37.01% to 38.63%, while mean values of transmittance and the translucency parameter decreased from 1.04% to 0.87% and 19.44 to 18.03, respectively. With an increase of the Wa value from 0.0 mm to 0.2 mm, mean values of reflectance decreased from 37.06% to 30.30%, while transmittance and the translucency parameter increased from 1.10% to 2.05% and 19.15 to 20.01, respectively. Color difference values (ΔE) ranged from 0.30 to 1.45 (Ra group) and from 1.46 to 4.16 (Wa group), respectively.

CONCLUSIONS

Surface texture of dentin porcelain significantly influenced the optical properties of enamel-dentin porcelain specimens, and surface waviness (Wa) had higher correlation coefficients with optical parameters than did roughness (Ra).

摘要

问题陈述

牙本质瓷表面的纹理差异可能会改变牙釉质-牙本质-瓷界面处的入射光方向，并影响陶瓷冠的光学性能。

目的

本研究的目的是测量具有不同牙本质瓷表面纹理的牙釉质-牙本质-瓷复合体的光学参数，并分析光学参数与表面纹理之间的关系。

材料和方法

制作了 80 个牙本质瓷（Shofu Vintage Halo，A2 色）圆盘（1.0×10.0mm），并将其分为 10 组（n=8）。通过修改表面粗糙度（Ra）和不同波纹度（Wa），使牙本质瓷标本具有不同的表面纹理。在对牙釉质-牙本质-瓷复合体进行标准修整后，使用分光光度计（PR-650）测量透射率、反射率和 CIE Lab值。分别用 CIE Lab值计算半透明度参数（TP）和色差值（ΔE）。通过单向方差分析和 Fisher 的 LSD（最小显著差异）事后检验（α=.05）对数据进行统计学分析。

结果

表面粗糙度（P<.05）和波纹度值（P<.01）显著影响透射率、反射率和半透明度参数。随着 Ra 值从 1.23μm 降低到 0.15μm，平均反射率值从 37.01%增加到 38.63%，而透射率和半透明度参数的平均值从 1.04%降低到 0.87%和 19.44 降低到 18.03。随着 Wa 值从 0.0mm 增加到 0.2mm，平均反射率值从 37.06%降低到 30.30%，而透射率和半透明度参数的值从 1.10%增加到 2.05%和 19.15 增加到 20.01。色差值（ΔE）范围分别为 0.30 至 1.45（Ra 组）和 1.46 至 4.16（Wa 组）。