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首页> 外文期刊>The Journal of Prosthetic Dentistry >Marginal adaptation of zirconium dioxide copings: Influence of the CAD/CAM system and the finish line design
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Marginal adaptation of zirconium dioxide copings: Influence of the CAD/CAM system and the finish line design

机译：二氧化锆顶盖的边缘适应性：CAD / CAM系统和终点线设计的影响

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Statement of problem Marginal adaptation is essential for the long-term success of dental restorations. Studies comparing the marginal gaps of computer-aided design/computer-aided manufacturing (CAD/CAM) restorations made from conventional and digital impressions are limited. Purpose The purpose of this study was to evaluate the marginal adaptation of zirconium dioxide copings made with 2 different CAD/CAM systems, the Lava All-Ceramic System (scanning definitive dies made with conventional impressions) and the Lava Chairside Oral Scanner (scanning directly from the prepared tooth). In addition, the influences of 2 different finish line configurations were also compared. Material and methods Forty human molar teeth were prepared to receive complete crowns. Twenty were prepared with a 90-degree round shoulder and the other 20 with a 45-degree chamfer finish line. Zirconium dioxide copings were fabricated by using CAD/CAM technology. The specimens were randomized; they included 10 teeth with round shoulder and 10 with chamfer finish lines with the Lava All-Ceramic System, and 10 teeth with round shoulder and 10 with chamfer finish lines with the Lava Chairside Oral Scanner. The marginal gaps were measured at 5 points on each side with stereomicroscopy at 40× magnification. Data were analyzed with 2-way ANOVA (α=.05). Results The mean values of the measured marginal gap for the round shoulder group were 52.66 μm with the Lava All-Ceramic System and 14.98 μm with the Lava Chairside Oral Scanner. The mean values for the chamfer group were 64.06 μm for the Lava All-Ceramic System and 18.45 μm for the Lava Chairside Oral Scanner. Differences were identified when the marginal gaps between the specimens with different CAD/CAM systems were compared. However, differences in the finish line design were identified only between the round shoulder and chamfer with the Lava All-Ceramic System. Conclusions Restorations fabricated with the Lava Chairside Oral Scanner displayed smaller marginal gaps than those made with the Lava All-Ceramic System. Nevertheless, all marginal gaps were within the range of clinical acceptability for both groups.
机译：问题陈述边缘适应对牙齿修复的长期成功至关重要。比较由传统和数字印模制作的计算机辅助设计/计算机辅助制造（CAD / CAM）修复体的边际差距的研究非常有限。目的这项研究的目的是评估由2种不同的CAD / CAM系统，Lava All-Ceramic系统（扫描使用常规印模制作的确定模具）和Lava Chairside口腔扫描仪（直接从准备好的牙齿）。此外，还比较了2种不同终点线配置的影响。材料和方法准备了40颗人类臼齿以接受完整的牙冠。准备了20个带有90度圆角的肩部，另20个带有45度倒角终点线。通过使用CAD / CAM技术制造二氧化锆顶盖。标本随机分组。他们使用Lava All-Ceramic System包括10个带有圆肩的牙齿和10个带有倒角终点线的牙齿，以及带有Lava Chairside口腔扫描仪的10个带有倒角终点线和10个带有倒角终点线的牙齿。用立体显微镜在40倍放大率下在每侧的5个点处测量边缘间隙。用2-方差分析（α= .05）分析数据。结果圆肩组的测量边缘间隙平均值在Lava All-Ceramic系统下为52.66μm，在Lava Chairside口腔扫描仪上为14.98μm。对于Lava All-Ceramic系统，倒角组的平均值为64.06μm，对于Lava Chairside口腔扫描仪，则为18.45μm。比较具有不同CAD / CAM系统的样本之间的边际间隙时，可以识别出差异。但是，仅在熔岩全陶瓷系统的圆肩和倒角之间发现了终点线设计的差异。结论用Lava椅旁口腔扫描仪制作的修复体的边缘间隙比用Lava全陶瓷系统制作的修复体小。尽管如此，两组的所有边缘性差距均在临床可接受范围内。

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