Anić I, Shirasuka T, Matsumoto K
Department of Dental Pathology, School of Dentistry, University of Zagreb, Zagreb, Croatia.
J Endod. 1995 Dec;21(12):594-8. doi: 10.1016/S0099-2399(06)81110-6.
The canals of 20 human dental roots were instrumented using a a step- back technique. The smear layer was removed, and the canals were obturated with composite resin. Two different techniques of compaction were used: either vertical or lateral motions were used to condense composite resin inside the root canal that was then photopolymerized layer by layer using the argon laser (488 nm). The beam was delivered into the root canal by means of an optical fiber 320 micrometers in diameter. Longitudinal and cross-sections of the samples and resin replicas of the root canals were examined using a light and scanning electron microscope. Scanning electron microscopic examination revealed that laterally compacted resin fillings showed fewer voids than those obtained by vertical compaction. In both experimental groups, adhesion of the resin to the dentin walls, pulled-out resin tags, microfailure, and resin fracture, leaving a layer of resin associated with the wall surface were observed.
使用逐步后退技术对20颗人牙根的根管进行预备。去除玷污层，并用复合树脂充填根管。采用两种不同的压实技术：使用垂直或侧向运动在根管内压实复合树脂，然后使用氩激光（488nm）逐层进行光聚合。光束通过直径为320微米的光纤导入根管。使用光学显微镜和扫描电子显微镜检查样本的纵剖面和根管的树脂复制品。扫描电子显微镜检查显示，侧向压实的树脂充填物比垂直压实的树脂充填物孔隙更少。在两个实验组中，均观察到树脂与牙本质壁的黏附、拔出的树脂标签、微渗漏和树脂断裂，留下一层与壁表面相关的树脂。
