Zerr M a, Johnson W T, Walton R E
Department of Endodontics, University of Iowa, College of Dentistry, Iowa City 52242, USA.
Gen Dent. 1996 Mar-Apr;44(2):132-4; quiz 141-2.
Metal ruber-dam retainers may damage tooth structure, restorations, and the porcelain surface of crowns. In this study, effects of metal versus plastic retainers on the surface of porcelain fused to metal (PFM) were compared, specifically: defects at point of beak contact, and porcelain fracturing. Evaluation was performed with scanning electron microscopy (SEM); micrographs were examined for porcelain defects. No damage was evident with metal or plastic retainer placement. In conclusion, neither metal nor plastic retainers consistently damaged PFM surfaces.
金属橡皮障固位体可能会损害牙齿结构、修复体以及牙冠的瓷表面。在本研究中，比较了金属与塑料固位体对烤瓷熔附金属（PFM）表面的影响，具体包括：喙部接触点处的缺陷以及瓷裂。采用扫描电子显微镜（SEM）进行评估；检查显微照片以查看瓷质缺陷。放置金属或塑料固位体均未发现明显损伤。总之，金属和塑料固位体均不会持续损害PFM表面。
