Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns.
Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns.
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DOI：
10.4047/jap.2010.2.2.33
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发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
Yang JH
中科院分区：
文献类型：
--
作者：
Pak HS;Han JS;Lee JB;Kim SH;Yang JH
边缘适合是考虑修复体长期成功的一个非常重要的因素。然而，将瓷添加到内冠可能会导致变形，并导致不适当的配合，从而使更多的粘接材料暴露于口腔环境，并导致继发性龋齿。本研究的目的是比较2种不同全瓷冠系统在瓷贴面前后的边缘适合性。本研究还旨在验证部分烧结氧化锆块（Lava CAD/CAM系统）的绿色加工冠和通过完全烧结氧化锆块（Digident CAD/CAM系统）的加工获得的冠的边缘适合性。每个系统制作20个牙冠，通过光学显微镜和图像处理（Accura 2000）在随机选择的50个点处评价边缘配合。每个牙冠测量两次：第一次测量在获得0.5mm的顶盖之后进行，第二次测量在瓷贴面之后进行。计算平均值和标准差，并使用独立t检验进行两组之间的统计推断，并通过配对t检验进行同一组内的统计推断。Digident CAD/CAM氧化锆陶瓷冠在瓷贴面前的边缘适合的平均值和标准差为61.52 ± 2.88 µ m，瓷贴面后为83.15 ± 3.51 µ m。Lava CAD/CAM氧化锆陶瓷冠在瓷贴面前的平均值和标准差为62.22 ± 1.78 µ m，瓷贴面后为82.03 ± 1.85 µ m。两组在分析各组内瓷贴面前后的边缘间隙时显示出显著差异。而各组瓷贴面修复前后的边缘间隙无显著性差异。2个全瓷冠系统显示边缘间隙在报告的临床可接受的边缘差异范围内。
Marginal fit is a very important factor considering the restoration's long-term success. However, adding porcelain to copings can cause distortion and lead to an inadequate fit which exposes more luting material to the oral environment and causes secondary caries. The purpose of this study was to compare the marginal fit of 2 different all-ceramic crown systems before and after porcelain veneering. This study was also intended to verify the marginal fit of crowns originated from green machining of partially sintered blocks of zirconia (Lava CAD/CAM system) and that of crowns obtained through machining of fully sintered blocks of zirconia (Digident CAD/CAM system). 20 crowns were made per each system and the marginal fit was evaluated through a light microscope with image processing (Accura 2000) at 50 points that were randomly selected. Each crown was measured twice: the first measurement was done after obtaining a 0.5 mm coping and the second measurement was done after porcelain veneering. The means and standard deviations were calculated and statistical inferences among the 2 groups were made using independent t-test and within the same group through paired t-test. The means and standard deviations of the marginal fit were 61.52 ± 2.88 µm for the Digident CAD/CAM zirconia ceramic crowns before porcelain veneering and 83.15 ± 3.51 µm after porcelain veneering. Lava CAD/CAM zirconia ceramic crowns showed means and standard deviations of 62.22 ± 1.78 µm before porcelain veneering and 82.03 ± 1.85 µm after porcelain veneering. Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group. However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well. The 2 all-ceramic crown systems showed marginal gaps that were within a reported clinically acceptable range of marginal discrepancy.
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影响因子：
2.9
作者：
Beschnidt, SM;Strub, JR
通讯作者：
Strub, JR
影响因子：
14
作者：
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4.6
作者：
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影响因子：
4.6
作者：
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通讯作者：
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