| 摘要: |
| 目的 分析3种不同厚度、不同颜色氧化锆瓷材料的透光率与色度值的关系,为全瓷修复体颜色复现引入透光率系数提供依据,以更好地模拟天然牙本质的光学特性.方法 利用X-rite color i7分光光度仪分别对三种品牌(Lava、Upcera、Doceram)不同颜色、不同厚度(0.9、0.6、0.3 mm)的氧化锆瓷片进行透光率和反射率(L*、a*、b*)的测量,采用SPSS 18.0软件对结果进行多元线性分析,探讨透光率与厚度及色度值的线性关系.结果 3种品牌的氧化锆瓷片的透光率差异无统计学意义(P>0.05).0.9、0.6、0.3 mm 3种厚度的氧化锆瓷片的透光率范围分别为13.63%～27.47%、18.05%～33.96%、25.24%～39.73%,差异有统计学意义(P<0.05).Upcera、Doceram、Lava 3种品牌的氧化锆瓷片透光率与厚度、色度值之间存在线性关系,回归方程分别为:TT=0.366×L*－0.661×厚度－b*×0.280,TT=0.524×L*－0.536×厚度-0.237×b*,TT=0.210×L*－0.610×厚度－0.164×b*.结论 3种品牌的氧化锆瓷片透光率范围无明显差异;随着瓷片厚度的增加,透光率逐渐减小;随着瓷片亮度的增加,透光率逐渐升高;瓷片越偏蓝色,透光率越高.因此,在全瓷修复过程中,引入透光率系数这一比色指标从而重新定义天然牙颜色的认知和表述形式是十分必要的. |
| 关键词: 义齿 氧化锆全瓷 透光率 颜色 |
| DOI：10.3724/SP.J.1008.2015.00054 |
| 投稿时间：2014-06-24修订日期：2014-11-19 |
| 基金项目:国家自然科学基金(81271177). |
|
| Analysis of linearity between light transmittance and color value of three different brands of zirconia ceramics |
| LI Chen,WANG Shao-hai,WANG Da-lin* |
(Department of Stomatology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China
*Corresponding author) |
| Abstract: |
| Objective To analyze the relationship between the light transmittance and the color value of 3 different brands of zirconia dental ceramic materials of various thicknesses and colors, so as to provide evidence for a new indicator to the Colorimetric system to better simulate the natural dentin color. Methods X-rite color i7 spectrophotometer was used to measure the transmittance and reflectance (L*, a*, b*) of three brands (Lava, Upcera, Doceram) of zirconia ceramic materials of different colors and different thicknesses (0.9, 0.6 and 0.3 mm). The results were analyzed by SPSS18.0 software to investigate the linearity of transmittance with thickness and color values of the materials. Results The transmittance was not significantly different among the three brands of zirconia ceramic materials (P>0.05); the transmittance ranges of different thicknesses of zirconia ceramic (0.9, 0.6 and 0.3 mm) were 13.63%-27.47%, 18.05%-33.96%, and 25.24%-39.73%, respectively, showing significant difference (P<0.05). There was a linear relation of the transmittance with the thickness and color values of the three brands of zirconia ceramic materials: Upcera:TT=0.366×L*-thickness×0.661-0.280×b*; Doceram: TT=0.524×L*-0.536×thickness-0.237×b*; Lava: TT=0.210×L*-0.610×thickness-0.164×b*. Conclusion The transmittance ranges of the three brands of zirconia ceramic material are similar. The transmittance decreases with increase of its thickness and increases with luminance increase. Bluer zirconia ceramic has higher transmittance. Therefore, introduction of transmittance value for ceramic restoration process is important to redefine the natural tooth color perception and representation. |
| Key words: dentures zirconia ceramic transmittance color |
