数字化口腔修复(18)——CAD/CAM全瓷冠与个性化基台的适合性

Digital restorative dentistry and prosthodontics(18)——The fit of all-ceramic crowns and custom abutments

目的:比较不同计算机辅助设计和制造(computer aided design/manufacture,CAD/CAM)全瓷冠与氧化锆个性化基台的边缘和内部适合性。方法:用CAD/CAM分别设计和加工氧化锆个性化基台和全瓷冠3组(IPS e.max、Enamic和Suprinity),每组各5个全瓷冠。通过微机断层扫描(micro computed tomography,micro-CT)测量全瓷冠与氧化锆个性化基台的绝对边缘差异(absolute marginal discrepancy,AMD)、轴面间隙(axial gap,AG)、咬合间隙(occlusal gap,OG),比较不同材料全瓷冠与氧化锆个性化基台的边缘和内部适合性。结果:Enamic组分别与IPS e.max组和Suprinity组AMD之间的比较差异均具有统计学意义(P<0.05);而IPS e.max组与Suprinity组AMD之间的差异则无统计学意义(P>0.05)。Suprinity组分别与IPS e.max组和Enamic组AG之间的比较差异均具有统计学意义(P<0.05);IPS e.max组与Enamic组AG之间的差异不具有统计学意义(P>0.05)。Suprinity组、IPS e.max组和Enamic组3组OG之间的比较差异具有统计学意义(P<0.05)。结论:不同的CAD/CAM全瓷冠材料影响其边缘和内部适合性。Suprinity和IPS e.max陶瓷材料的边缘适合性优于Enamic材料,Suprinity材料全瓷冠的轴面间隙和咬合间隙最小。

Objective： To compare the marginal and internal fits of different computer aided design/manufacture（ CAD/CAM） all-ceramic crowns seated on zirconia custom abutments. Methods： CAD/CAM systems were used to fabricate a zirconia custom abutment and three groups（ IPS e. max,Enamic and Suprinity） of all-ceramic crowns for five samples,respectively. The absolute marginal discrepancy（ AMD）,axial gap（ AG）,and occlusal gap（ OG） were evaluated by micro computed tomography（ micro-CT） for comparing the marginal and internal fits of all-ceramic crowns and zirconia custom abutments. Results： AMD of Enamic group were significantly different from that of IPS e. max group and Suprinity group（ P 0. 05）. AG of IPS e. max group and Enamic group were evidently different from that of Suprinity group（ P 0. 05）. There were statistically signifiant difference for OG among three groups（ P 0. 05）. Conclusion： Different materials of CAD / CAM influenced the marginal and internal fit of all-ceramic crowns. For AMD,the ceramics of IPS e. max and Suprinity were much better than of Enamic. As for AG and OG,Suprinity was much better than that of Enamic and IPS e. max.