Researcher, Department of Conservative Dentistry and Orofacial Prosthodontics, School of Dentistry, Complutense University of Madrid, Madrid, Spain.
Postgraduate student, Department of Conservative Dentistry and Orofacial Prosthodontics, School of Dentistry, Complutense University of Madrid, Madrid, Spain.
J Prosthet Dent. 2020 Sep;124(3):351-356. doi: 10.1016/j.prosdent.2019.09.021. Epub 2019 Dec 4.
Clinical studies about interim implant-supported prostheses made of polymethylmethacrylate (PMMA) and polyoxymethylene (POM) have been limited to clinical reports or studies on the survival of implants subjected to immediate loading without evaluating the influence of the material used.
The purpose of this randomized clinical trial was to evaluate the clinical performance of posterior resin interim implant-supported fixed partial dentures (FPDs) made of 2 different computer-aided design and computer-aided manufactured (CAD-CAM) materials: PMMA and POM.
A total of 21 participants received 49 interim implant-supported FPDs. The same participant received the PMMA as part of the control group and the POM as part of the experimental group. The restorations were evaluated at 1 week and 3 and 6 months after their placement, using the California Dental Association (CDA) quality-evaluation index. Their functional wear and color stability were also evaluated. Data were analyzed by using nonparametric statistics (α=.05).
The CDA criteria showed that the PMMA group performed better than the POM group in the surface and color parameter (P<.05). Fractures at the implant connection level were observed in 10 prostheses. The number of fractures was significantly higher in internal conical connection implants (P<.05). The statistical analysis of color stability showed values of ΔE*ab of 7.18 for PMMA and 8.58 for POM, without significant differences between materials. Concerning the wear evaluation, a significant increase in the wear of both materials was found at 6 months of functioning (P<.05). No significant differences were found within materials.
Within a 6-month observation period, PMMA interim implant-supported FPDs performed better than POM in the surface and color parameter. Entirely polymer posterior implant-supported FPDs with internal conical connection implants appear to be more susceptible to fracture.
关于聚甲基丙烯酸甲酯（PMMA）和聚氧化甲烯（POM）制成的临时植入物支持的假体的临床研究仅限于临床报告或研究即刻负载下植入物的存活率，而没有评估所使用材料的影响。
本随机临床试验的目的是评估 2 种不同计算机辅助设计和计算机辅助制造（CAD-CAM）材料制成的后牙树脂临时植入物支持固定局部义齿（FPD）的临床性能：PMMA 和 POM。
共有 21 名参与者接受了 49 个临时植入物支持的 FPD。同一名参与者接受了 PMMA 作为对照组的一部分，POM 作为实验组的一部分。在放置后 1 周和 3 个月和 6 个月时，使用加利福尼亚牙科协会（CDA）质量评估指数对修复体进行评估。还评估了它们的功能磨损和颜色稳定性。使用非参数统计分析（α=.05）分析数据。
CDA 标准表明，在表面和颜色参数方面，PMMA 组的表现优于 POM 组（P<.05）。在 10 个修复体中观察到在植入物连接水平处发生的骨折。在内部锥形连接植入物中，骨折的数量明显更高（P<.05）。对颜色稳定性的统计分析显示，PMMA 的ΔE*ab 值为 7.18，POM 的为 8.58，两种材料之间无显著差异。关于磨损评估，在 6 个月的功能使用中，两种材料的磨损均显著增加（P<.05）。在材料内部未发现显著差异。
在 6 个月的观察期内，PMMA 临时植入物支持的 FPD 在表面和颜色参数方面的表现优于 POM。具有内部锥形连接植入物的全聚合物后牙植入物支持的 FPD 似乎更容易发生骨折。
Zotero 插件