Lai Yi-Yin, Pai Lu, Chen Chin-Ping
Graduate Institute of Clinical Dentistry, School of Dentistry, National Defense Medical Center (NDMC), Taipei, Taiwan.
J Endod. 2007 Jul;33(7):875-8. doi: 10.1016/j.joen.2007.03.016. Epub 2007 May 2.
This study compared the marginal leakage of temporary restorations using Cavit, IRM, zinc phosphate cement (ZPC), and copper bands cemented with ZPC. Standardized complex endodontic access preparations were made in 176 extracted human molars. The teeth were divided into six groups, including positive and negative controls. A Universal matrix system was placed over each tooth before restoration, except in the copper band group, in which teeth were restored with ZPC after copper band cementation. Marginal leakage was evaluated with a binocular microscope after the teeth were immersed in artificial saliva, colored with 2% methylene blue and buffered to neutral pH, at 37 degrees C for various time intervals after thermal cycling. In the experimental groups, the differences in the leakage scores of the Cavit group and the other groups were very marked. The Cavit group presented the least marginal leakage, irrespective of time, whereas more than half the specimens from the IRM, ZPC, and copper band groups displayed severe leakage from day 1.
本研究比较了使用Cavit、IRM、磷酸锌水门汀（ZPC）以及用ZPC黏固的铜带进行临时修复体的边缘微渗漏情况。在176颗拔除的人磨牙上制作标准化的复杂根管入口预备。将牙齿分为六组，包括阳性和阴性对照。除铜带组外，在修复前在每颗牙齿上放置通用基质系统，铜带组在铜带黏固后用ZPC进行修复。在牙齿浸入人工唾液、用2%亚甲蓝染色并缓冲至中性pH值后，在37℃下经过热循环后的不同时间间隔，用双目显微镜评估边缘微渗漏情况。在实验组中，Cavit组与其他组的渗漏评分差异非常显著。无论时间如何，Cavit组的边缘微渗漏最少，而从第1天起，IRM、ZPC和铜带组超过一半的标本显示出严重渗漏。
