重复烧结对三种牙科全瓷光色参数及微观结构的影响
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摘要
目的比较重复烧结对三种牙科全瓷色参数(L*、a*、b*)和光学特性(CR、TP、S、K、RI)的影响,并进行微观结构的分析,考察重复烧结与光色参数变化与物相微观结构变化的关系。材料与方法选择市售三种品牌的全瓷基底冠材料(IPS EmpressⅡ热压全瓷,VITA In-Cream氧化铝全瓷和Cercon CAD/CAM氧化锆全瓷)制作瓷样本。在Color-Eye 7000A分光光谱仪上测量样本的色参数CIE L*、a*、b*,及黑白背景下的反射系数R0、R,计算透射性参数CR、TP、S、K和RI。利用XRD、ESEM和孔隙分析仪对基底冠瓷、饰面瓷样本进行微观结构的分析。样本重复烧结后,再次测量和计算光色参数并进行微观结构分析。统计用两因素多水平重复测量方差分析,组间用LSD-t检验,检验水平为α=0.05。将总孔体积与光色参数进行相关回归分析。结果随着烧结次数的增加,三种品牌的全瓷基底冠晶体变得致密,玻璃相减少;基底冠瓷、饰面瓷气孔的孔径都有所减小。不同烧结次数的热压瓷及锆瓷在第1与第5次烧结的总孔体积均值之间的差异具有统计学意义(P<0.05)。不同品牌相同烧结次数的基底冠瓷、饰面瓷样本总孔体积均值总体不等(P<0.05),同品牌不同烧结次数的光参数TP、RI的均值总体不等(P<0.05),5次烧结后,三种品牌全瓷样本色参数无明显变化(P>0.05)。总孔体积与光色参数的相关性无规律可言。结论相同种类的瓷样本伴随烧结次数的增加,铝瓷的总孔体积受影响最小,其次是锆瓷,最后才是热压瓷。在相同的烧结次数下的不同种类的瓷样本中,铝瓷的总孔体积受影响最小,其次是热压瓷和锆瓷。3种品牌的基底冠瓷和饰面瓷样本在一定孔径范围内的总孔体积减少,孔径范围呈现由大到小的偏移。同一品牌的全瓷材料,当烧结次数≦5时,烧结次数不会对其色参数差和色差的改变造成影响。在相同烧结次数下,铝瓷的色差变化最大,锆瓷最小,热压瓷介于两者之间。在相同烧结次数的总孔体积变化,热压瓷最大,铝瓷与锆瓷相同。总孔体积变化与色参数差、色差相关分析表明,仅用总孔体积变化不足以表达色差和色参数差。就同一品牌全瓷样本而言,烧结次数对光参数有一定程度的影响。不同品牌全瓷样本相同的烧结次数下的光参数有影响。
Objective: The aim of this study was to compare the effects of repeated sintering on the color(L*,a*,b*), optical parameters(CR,TP,S,K,RI) and microstructure of three dental all-ceramic systems, to evaluate the relationship between change of microstructure and change of color / optical parameters. Material and methods:Specimens were made of three kinds of all-ceramics: IPS EmpressⅡheat-pressed all-ceramic, Vita In-cream alumina all-ceramic, Cercon CAD/CAM zirconia-based all-ceramic.Color parameters(L*,a*,b*) and spectral reflectance data(R0, R) were measured according to the CIELAB color scale relative to the standard illuminant D65 in the reflectance mode over a black background and a white background on Color- Eye 7000A spectrophotometer. The transmission parameters CR and TP were calculated from spectral reflectance data, the optical constants including scattering coefficient(S), absorption coefficient(K) and light reflectivity(RI) were calculated algebraically using Kubelka-Munk equations. Specimens were characterized by using X-ray diffraction, Scanning electron microscopy and Pore master. Color/optical parameters and microstructure were measured again after repeated sintering. Repeated measures ANOVA analysis of variance and LSD-t test were used to analyze the data for significant differences (α=.05), the correlation between pore volumes and Color/optical parameters were analyzed. Results: With the number of sintering increasing, the particles of three brand all-ceramic core specimens slightly increased, glass phase decreased; pore diameter of core and veneering ceramics were decreased. There was no statistically significant difference between pore volume after first and fifth sintering for both IPS EmpressⅡheat-pressed all-ceramic and Vita In-cream alumina all-ceramic(P<0.05). A difference was found in pore volume of different brand core and veneering ceramics (P<0.05). A difference was found in RI and TP after repeated sintering (P<0.05). There was no significant difference in other color/optical parameters after fifth sintering(P>0.05). The correlation coefficients have no regularity between color and optical parameters. Conclusions:With the number of sintering increasing, pore volume of Vita In-cream alumina all-ceramic was affected minimum, followed by the Cercon zirconia-based all-ceramic, finally IPS heat-pressed all-ceramic. At the same number of sintering of different brands of ceramic samples, the pore volume of Vita In-cream alumina all-ceramic was affected minimum, followed by IPS heat-pressed all-ceramic and Cercon zirconia-based all-ceramic. The pore diameter of three brand core and veneering ceramics were decreased, showing the migration from large to small. For the same brand all-ceramic, the color parameters were not affected up to the 5th sintering. With the same number of sintering, maximum color difference was found in Vita In-cream alumina all-ceramic, Cercon zirconia-based all-ceramic was affected minimum. With the same number of Sintering , maximum change of pore volume was found in IPS EmpressⅡheat-pressed all-ceramic. Regression analysis showed that change of pore volume can not explain the change in the color difference and color parameters difference. For the same brand of all-ceramic specimens, the number of sintering has an impact on optical parameters in some degree. With the same number of sintering, brands has impact on optical parameters.
引文
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