Chai J, McGivney G P, Munoz C A, Rubenstein J E
Nobel Biocare Center for Excellence, School of Dentistry, University of Michigan, Ann Arbor, USA.
J Prosthet Dent. 1997 Jan;77(1):1-11. doi: 10.1016/s0022-3913(97)70199-9.
A new method for fabrication of crowns and fixed partial dentures (Procera system) that involves electric discharge machining and copy milling has been developed. The metal used is unalloyed titanium, which can be processed as a single coping or multiple units joined to a pontic by laser welding.
The single-unit coping or the fixed partial denture (FPD) substructure is then veneered with a low-fusing porcelain.
In this article the clinical application of this technique was evaluated by six major universities in the United States. A total of 114 patients participated in this study, which involved 126 restorations (55 maxillary and 71 mandibular prostheses). There were 179 abutments, of which 73 were crowns and 53 were three-unit FPDs. Surface and color, anatomic form, and margin integrity were assessed 1 month after cementation and at 1 year with the California Dental Association (CDA) quality assessment evaluation system.
No statistically significant differences in CDA scores between the 1 month evaluations and the 1 year assessments were found for surface and color (p = 0.68), anatomic form (p > 0.99), or margin integrity (p = 0.57). By use of the lowest ranking in the three categories as the overall quality of the restoration, only 3.3% (two crowns and two FPDs) were not acceptable at the 1-month visit and 4.5% (two crowns and three FPDs) were not acceptable at the 1-year evaluation. At-the 1-month visit 96.6% (114) of the restorations were considered to be satisfactory, whereas 95.5% (107 restorations) were evaluated similarly at the 1-year evaluation.
The Procera system demonstrated, by use of the CDA criteria, its capability to produce quality prostheses that were rated satisfactory more than 95% of the time after insertion and maintained this high rating at least for 1 year.
已开发出一种用于制作牙冠和固定局部义齿的新方法（Procera系统），该方法涉及电火花加工和仿形铣削。所使用的金属为非合金钛，可加工成单个桩冠或通过激光焊接连接到桥体的多个单元。
然后用低熔瓷为单单元桩冠或固定局部义齿（FPD）的下部结构进行饰面。
本文中，美国六所主要大学对该技术的临床应用进行了评估。共有114名患者参与了本研究，涉及126颗修复体（55颗上颌修复体和71颗下颌修复体）。有179个基牙，其中73个为牙冠，53个为三单元FPD。在粘结后1个月和1年时，使用加利福尼亚牙科协会（CDA）质量评估评价系统对表面和颜色、解剖形态以及边缘完整性进行评估。
在表面和颜色（p = 0.68）、解剖形态（p > 0.99）或边缘完整性（p = 0.57）方面，1个月评估和1年评估之间的CDA评分无统计学显著差异。以三类中的最低排名作为修复体的整体质量，在1个月复诊时，只有3.3%（两颗牙冠和两颗FPD）不可接受，在1年评估时，4.5%（两颗牙冠和三颗FPD）不可接受。在1个月复诊时，96.6%（114颗）修复体被认为满意，而在1年评估时，95.5%（107颗修复体）得到类似评价。
根据CDA标准，Procera系统显示出能够制作出质量优良的修复体，植入后超过95%的时间被评为满意，并且至少在1年内保持这一高评分。
