Blum J Y, Abadie M J
J Endod. 1997 Nov;23(11):669-75. doi: 10.1016/S0099-2399(97)80398-6.
The aim of this study was to evaluate the canal cleanliness achieved by five different preparation techniques, including use of the laser. By randomization, the palatal roots of 50 maxillary molars were assigned to one of five groups. During all preparations, a sodium hypochlorite irrigant was used. The following techniques were studied: (A) manual instrumentation (serial preparation), (B) laser preparation (Nd:YAP laser), (C) manual preparation with laser as adjunct, (D) manual preparation with a subsonic device as adjunct (MM 3000 with shapers), and (E) manual instrumentation with a subsonic device and laser as adjuncts (MM 3000 with shapers, Nd:YAP laser). The canal wall surfaces were examined under a scanning electron microscope at all levels with a new method using grid incrustation on the microscope screen. Techniques A and C differed from each other only by the size of the debris particles, which were smaller for the C preparation. For laser preparation (B) there was little increase in canal diameter increase, and a substantial amount of debris was present. The differences between techniques A, C, and D were not significant. The use of the subsonic device and laser together as adjuncts (E) showed the cleanest preparation with very little debris, opened tubules, and very small particle size. This result suggests that the laser has a potential in ensuring optimal canal cleanliness.
本研究的目的是评估包括使用激光在内的五种不同预备技术所达到的根管清洁程度。通过随机分组，将50颗上颌磨牙的腭根分配到五组中的一组。在所有预备过程中，均使用次氯酸钠冲洗液。研究了以下技术：(A) 手动器械预备（逐步预备），(B) 激光预备（钕:钇铝石榴石激光），(C) 以激光作为辅助的手动预备，(D) 以亚声器械作为辅助的手动预备（带有成形器的MM 3000），以及(E) 以亚声器械和激光作为辅助的手动器械预备（带有成形器的MM 3000，钕:钇铝石榴石激光）。使用一种在显微镜屏幕上进行网格包埋的新方法，在扫描电子显微镜下对根管壁表面的各个层面进行检查。技术A和C之间的差异仅在于碎屑颗粒的大小，C组预备后的碎屑颗粒较小。对于激光预备（B），根管直径增加幅度较小，且存在大量碎屑。技术A、C和D之间的差异不显著。将亚声器械和激光一起作为辅助（E）显示出预备最清洁，碎屑极少，牙本质小管开放，且颗粒尺寸非常小。这一结果表明激光在确保最佳根管清洁方面具有潜力。
