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首页> 外文期刊>The Journal of Prosthetic Dentistry >Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique
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Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique

机译：利用CAD / CAM技术和热压技术制造的陶瓷冠修复体的边缘和内部适应性

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Statement of problem The accuracy of chairside computer-aided design and computer-aided manufacturing (CAD/CAM) restorations is questionable, and the effect of the die spacer settings is not well stated in the literature. Purpose The purpose of the study was to evaluate the marginal and internal adaptation of E4D crowns fabricated with different spacer thicknesses and to compare these crowns with those fabricated with the heat-press technique. Material and methods The E4D system was used to fabricate 30 crowns for the first 3 groups, with different spacer thickness settings: 30 μm, 60 μm, and 100 μm. In the fourth group, 10 lithium disilicate crowns were fabricated with the heat-press technique. The occlusal gap, axial gap, vertical marginal gap, and absolute marginal discrepancy were evaluated by x-ray microtomography. Statistical significance was assessed with the Kruskal-Wallis test (α=.05). For post hoc analyses, the Mann-Whitney U test was used alongside the Bonferroni correction for multiple comparisons (α=.008). Results Within the CAD/CAM groups, the 30-μm spacer thickness resulted in the lowest median axial gap (90.04 μm), whereas the 60-μm spacer thickness resulted in the lowest median occlusal gap (152.39 μm). The median marginal gap values of the CAD/CAM-60 group (49.35 μm) and CAD/CAM-100 group (46.65 μm) were lower than those of the CAD/CAM-30 group (55.18 μm). No significant differences among the CAD/CAM groups were observed for absolute marginal discrepancy. The heat-press group had significantly different values than those of the CAD/CAM groups. Conclusion The spacer thickness and fabrication technique affected the adaptation of ceramic crowns. The heat-press group yielded the best marginal and internal crown adaptation results. The 30- or 60-μm spacer settings are recommended for the E4D CAD/CAM system.
机译：问题陈述椅子旁计算机辅助设计和计算机辅助制造（CAD / CAM）修复的准确性值得怀疑，并且在文献中还没有很好地说明模具间隔件设置的效果。目的研究的目的是评估采用不同垫片厚度制作的E4D牙冠的边缘和内部适应性，并将这些牙冠与采用热压技术制作的牙冠进行比较。材料和方法E4D系统用于制造前3组的30个牙冠，并具有不同的垫片厚度设置：30μm，60μm和100μm。在第四组中，用热压技术制造了10个二硅酸锂冠。通过X射线显微断层摄影术评估咬合间隙，轴向间隙，垂直边缘间隙和绝对边缘差异。用Kruskal-Wallis检验（α= .05）评估统计学显着性。对于事后分析，Mann-Whitney U检验与Bonferroni校正一起用于多重比较（α= .008）。结果在CAD / CAM组中，间隔厚度为30μm的轴向间隙中值最低（90.04μm），而间隔厚度为60μm的轴向间隙中值最低（152.39μm）。 CAD / CAM-60组（49.35μm）和CAD / CAM-100组（46.65μm）的中位边缘间隙值低于CAD / CAM-30组（55.18μm）。在CAD / CAM组之间，绝对边缘差异没有显着差异。热压组的值与CAD / CAM组的值显着不同。结论垫片的厚度和制造工艺会影响陶瓷冠的适应性。热压组的边缘和内部牙冠适应效果最佳。对于E4D CAD / CAM系统，建议使用30或60μm的垫片设置。

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