Karlsson S
NIOM, Scandinavian Institute of Dental Materials, Oslo, Norway.
Acta Odontol Scand. 1993 Jun;51(3):129-34. doi: 10.3109/00016359309041158.
In contrast to conventional casting methods for the production of a metallic crown the Procera process is based on precision machine duplication of models combined with spark erosion of the metal frame. Some of the steps in the manual handling procedure are thereby excluded. The present study evaluated, by means of a replica technique, the fit or adaptation of Procera titanium crowns to the stone die and in vivo to the tooth before cementation. For any combination, the marginal adaptation was superior to and significantly better than the occlusal areas and axial surfaces, respectively. In addition, the crowns had a significantly better fit to the stone die than to the tooth. The marginal discrepancy was approximately 60 microns in vitro and 70 microns in vivo, with a range of 3-205 microns.
与用于制造金属冠的传统铸造方法不同，Procera工艺基于模型的精密机械复制以及金属框架的电火花加工。因此排除了手工操作过程中的一些步骤。本研究通过复制技术评估了Procera钛冠在粘结前与石膏模型以及体内与牙齿的贴合度或适应性。对于任何组合，边缘适应性分别优于咬合区域和轴向表面，且明显更好。此外，冠与石膏模型的贴合度明显优于与牙齿的贴合度。体外边缘差异约为60微米，体内为70微米，范围为3 - 205微米。
