Tamim Hazem, Skjerven Henrik, Ekfeldt Anders, Rønold Hans Jacob
Int J Prosthodont. 2014 Jul-Aug;27(4):331-7. doi: 10.11607/ijp.3607.
The aim of this in vivo study was to evaluate the accuracy of metal-ceramic crowns fabricated using computer-aided design/computer-assisted manufacturing (CAD/CAM) in conjunction with intraoral digital impressions.
Fifty patients in a general practice participated in the study. Patients were provided with crowns fabricated from digital impressions taken with an intraoral chairside scanner. Prior to crown insertion, the marginal integrity, esthetics, and occlusal and articulation contacts were evaluated using California Dental Association (CDA) criteria. The precementation space of the crowns was evaluated with the replica technique.
No adjustments were needed for any of the interproximal contact points. Adjustments of occlusion and articulation contacts were needed in 20% of the restorations. Clinical evaluation of the marginal integrity showed satisfactory results according to the CDA criteria. The 50 silicone replicas showed a median precementation space of 46 μm at the marginal measurement location, 94 μm at the midaxial location, and 185 μm at the centro-occlusal location.
The precementation spaces of the crowns were within the acceptable range for CAD/CAM restorations.
本体内研究的目的是评估使用计算机辅助设计/计算机辅助制造（CAD/CAM）结合口内数字印模制作的金属烤瓷冠的准确性。
五十名全科患者参与了本研究。为患者提供了由口内椅旁扫描仪采集的数字印模制作的牙冠。在牙冠就位前，使用加利福尼亚牙科协会（CDA）标准评估边缘完整性、美观性以及咬合和关节接触情况。使用复制技术评估牙冠的粘固前间隙。
任何邻面接触点均无需调整。20%的修复体需要调整咬合和关节接触。根据CDA标准，边缘完整性的临床评估显示结果令人满意。50个硅树脂复制体在边缘测量位置的粘固前间隙中位数为46μm，在中轴位置为94μm，在中央咬合位置为185μm。
牙冠的粘固前间隙在CAD/CAM修复体的可接受范围内。
