The clinical accuracy of single crowns exclusively fabricated by digital workflow-the comparison of two systems
The clinical accuracy of single crowns exclusively fabricated by digital workflow-the comparison of two systems
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DOI：
10.1007/s00784-013-0923-5
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发表时间：
2013-12-01
影响因子：
3.4
通讯作者：
Reich, Sven
中科院分区：
文献类型：
--
作者：
Brawek, Petya K.;Wolfart, Stefan;Reich, Sven
这项研究的目的是比较两个系统的数字工作流程专门制造的全冠的准确性。零假设是：两个系统在边缘和内部精度方面没有差异。在14名患者中，准备了13颗磨牙和1颗前磨牙。用Lava COS和Cerec AC两种不同的数字印模系统对每种制剂进行口腔内扫描。在此基础上，分别制作了Lava DVS冠[DVS]和Vita快速分层技术冠[RLT]。这两个系统都包含一个氧化锆框架和一个数字制作的硅酸盐陶瓷贴面。用复制体技术记录冠的边缘和内部适合性。复制品在放大倍数为200倍的显微镜下进行检查。采用Wilcoxon带符号秩次检验，检验两种系统的Pa值是否存在显著差异。以微米为单位(+/-标准差)，[DVS]为51(+/-38)，[RLT]为83(+/-51)；中轴为130(+/-56)，[RLT]为128(+/-66)；AXIO-咬合，[DVS]178(+/-55)，[RLT]230(+/-71)；正中(牙合)181(+/-41)，[RLT]297(+/-76)。根据Wilcoxon符号等级检验，结果在边缘、枢椎-牙合和中心-咬合间隙有显著差异。必须摒弃零假设。基于口内数字印记的完全数字化工作流程为两种系统的单个全冠提供了临床满意的结果。
The purpose of the study was to compare the accuracy of crowns exclusively fabricated by the digital workflow of two systems. The null hypothesis stated was: Both systems do not differ with respect to marginal and internal accuracy.In 14 patients, 13 molars and 1 premolar were prepared. Each preparation was scanned intraorally with two different digital impression systems, Lava COS and Cerec AC. On the basis of these data, Lava DVS crowns [DVS] and Vita Rapid Layering Technique crowns [RLT] were fabricated, respectively. Both systems contained of a zirconia framework and a digitally fabricated silicate ceramic veneering. The marginal and internal fit of the crowns was documented by a replica technique. The replicas were examined under microscope with a magnification of x200. The Wilcoxon signed rank test was applied in order to test if the values of the two systems showed significant differences at p a parts per thousand currency signaEuro parts per thousand 0.05.The results were as follows in micrometers (+/- standard deviation): at the marginal gap, 51 (+/- 38) for [DVS] and 83 (+/- 51) for [RLT]; mid-axial, 130 (+/- 56) for [DVS] and 128 (+/- 66) for [RLT]; axio-occlusal, 178 (+/- 55) for [DVS] and 230 (+/- 71) for [RLT]; and centro-occlusal, 181 (+/- 41) for [DVS] and 297 (+/- 76) for [RLT]. According to the Wilcoxon signed rank test, the results differed significantly at the marginal, axio-occlusal, and centro-occlusal gaps.The null hypothesis had to be rejected.The exclusively digital workflow on the basis of intraoral digital impressions delivered clinically satisfying results for single crowns with both systems.