Department of Prosthodontics, University of Bern, Siwtzerland.
Int J Oral Maxillofac Implants. 2011 May-Jun;26(3):648-56.
To analyze maintenance service of fixed maxillary prostheses and overdentures based on conventional gold bars or titanium bars and frameworks fabricated with computer-aided design/computer-assisted manufacture (CAD/CAM) technology.
Forty-one patients participated; 16 received an implant overdenture with a gold bar (gold OD), 12 received a CAD/CAM-fabricated implant OD with a titanium bar (Ti OD), and 13 received a CAD/CAM implant-supported fixed prosthesis (IFP). The bars and frameworks were screw-retained at the implant level. Maintenance service performed during the first 2 years was recorded and compared between the three groups. After this 2-year period, the Oral Health Impact Profile (OHIP) was administered.
For ODs (gold, Ti) most service consisted of activation of the matrices. Fractures of matrices and bar extensions occurred only in the gold OD group, and 65% of these patients exhibited hyperplasia of the peri-implant mucosa. The maintenance rates were 1.24 (gold OD), 1.36 (Ti OD), and 0.98 (IFP). These differences were not statistically significant. Retightening of occlusal screws was not necessary in any group. The probability that a complication occurred in the first year was high (60% to 70%) and statistically not different between the three groups. The probability that a second complication occurred was significantly lower for the IFP group versus the gold OD group. The mean OHIP values were 1.7 (IFP), 6.7 (gold OD), and 7.3 (Ti OD); ratings in the IFP group were significantly better.
Maintenance service was typical for implant prostheses in the edentulous maxilla. Direct screw retention at the implant level without abutments had a favorable effect in all groups. A trend toward a reduction in problems was observed with the CAD/CAM superstructures. The OHIP confirmed high satisfaction, but quality of life appeared to be slightly higher with fixed prostheses.
分析基于传统金杆或钛杆以及计算机辅助设计/计算机辅助制造（CAD/CAM）技术制作的框架的固定式上颌义齿和覆盖义齿的维护服务。
共有 41 名患者参与；16 名患者接受了带金杆的种植体覆盖义齿（金 OD），12 名患者接受了带钛杆的 CAD/CAM 制作的种植体覆盖义齿（Ti OD），13 名患者接受了 CAD/CAM 种植体支持的固定修复体（IFP）。杆和框架在种植体水平用螺丝固定。记录并比较了三组患者在前 2 年的维护服务情况。2 年后，进行口腔健康影响概况（OHIP）评估。
对于 OD（金、Ti），大多数服务都包括对基托的激活。仅在金 OD 组发生了基托和杆延伸的断裂，65%的患者出现了种植体周围黏膜增生。维护率分别为 1.24（金 OD）、1.36（Ti OD）和 0.98（IFP）。这些差异无统计学意义。任何组都不需要重新拧紧咬合螺丝。第一年发生并发症的概率很高（60%至 70%），三组间无统计学差异。IFP 组发生第二次并发症的概率明显低于金 OD 组。OHIP 平均值分别为 1.7（IFP）、6.7（金 OD）和 7.3（Ti OD）；IFP 组的评分明显更好。
上颌无牙颌种植义齿的维护服务通常是典型的。在所有组中，直接在种植体水平用螺丝固定而无基台具有良好的效果。CAD/CAM 上部结构的问题呈减少趋势。OHIP 证实了高满意度，但固定修复体的生活质量似乎略高。
