Wong W S, Rosenberg P A, Boylan R J, Schulman A
Department of Endodontics, New York University, College of Dentistry, New York 10010, USA.
J Endod. 1994 Dec;20(12):595-7. doi: 10.1016/S0099-2399(06)80084-1.
The purpose of this in vitro study was to compare the apical seals achieved using retrograde amalgam fillings or the Nd:YAG laser. Freshly extracted teeth were randomly separated into groups that would have their apices treated either with a Nd:YAG laser or retrograde amalgam. After instrumentation and obturation, bacterial reservoirs were prepared in the coronal portion of canals. Teeth to receive retrofillings had their apices prepared and amalgams placed. Teeth to be lasered had no apical preparations. Teeth and culture media were then sterilized by irradiation. Streptococcus salivarius was deposited in the opened bacterial reservoirs. At intervals, culture media with an indicator in culture chambers was observed for color change. Specimens that demonstrated color change were cultured for S. salivarius. Under the conditions of this in vitro study, no statistically significant difference was found in bacterial leakage between the laser-treated group and the retrograde amalgam group.
这项体外研究的目的是比较使用逆行银汞充填或钕钇铝石榴石（Nd:YAG）激光实现的根尖封闭效果。将新鲜拔除的牙齿随机分为两组，一组使用Nd:YAG激光处理根尖，另一组使用逆行银汞充填。在进行根管预备和充填后，在根管的冠部制备细菌储存库。接受逆行充填的牙齿进行根尖预备并放置银汞合金。接受激光处理的牙齿不进行根尖预备。然后通过辐照对牙齿和培养基进行灭菌。将唾液链球菌接种到开放的细菌储存库中。每隔一段时间，观察培养室中带有指示剂的培养基的颜色变化。出现颜色变化的标本培养唾液链球菌。在这项体外研究的条件下，激光处理组和逆行银汞充填组之间在细菌渗漏方面未发现统计学上的显著差异。
