Removal of intracanal broken instrument by laser welding.

1.激光焊接去除根管内细小碎屑我们报道了一种激光焊接去除根管内碎屑的新方法。我们对这种方法进行了改进，用直径为0.5 mm的不锈钢球从根管中取出了细小的K-锉。这项研究的目的是检查不锈钢球在激光焊接断头和不锈钢管子之间的效果。本实验使用了15个K文件提示。将一个不锈钢球插入上述管子中，K文件尖端的断端与球接触。然后，用900mJ 10pps的激光从管子的另一端照射1秒、2秒和3秒。最后，用一对钳子对焊接强度进行了评估。除1个n-1s照射组外，其余样品均成功进行激光焊接。结论：1.激光焊接可以去除根管内的细小碎屑。激光焊接根管内折断器械的取出本研究的目的是探讨用这种方法去除拔除的人牙的根管内折断器械。本实验使用了30个K文件(#8-#25)。每个指尖样本被插入到拔除的人上颌切牙的根管中。每个指甲样本都放置在根尖附近，并插入一根不锈钢管以接触指尖的冠端。然后，用能量为400mJ的10pps激光照射1s。激光治疗后，拔除根管。所有根尖均被成功地从根管中取出。结论：用激光焊接可以取出根管内破损的金属器械。

1. Removal of fine intracanal broken files with laser weldingWe reported a new method for the removal of intracanal broken instruments using laser welding. We improved this method to remove fine K-files from the root canal using a stainless-steel ball with a diameter of 0.5mm. The objective of this study was to examine the effects of the stainless-steel ball on laser welding between a broken file and a stainless-steel tube. Fifteen K-file tips were used in this experiment. Inserting a stainless-steel ball into the tube mentioned above, a broken end of a K-file tip was contacted with the ball. Then, Nd : YAG laser was irradiated through the other end of the tube at 900mJ 10pps for 1, 2 and 3 sec. Finally the strength of the welding was evaluated using a pair of pliers. Laser welding was successful in all samples except one n 1 sec irradiation group. We concluded that fine broken K-files in the root canal could be removed by laser welding using Nd : YAG laser.2. Removal of Intracanal Broken Instruments Using Laser WeldingThe objective of this study was to investigate the removal of intracanal broken instruments from extracted human teeth using this method. Thirty K-files (#8-#25) were used in this experiment. Each file tip sample was inserted into the root canal of an extracted human maxillary incisor. Each file sample was positioned near the root apex, and a stainless-steel tube was inserted to contact the coronal end of the file tip. Then, Nd : YAG laser was irradiated at 400mJ 10pps for 1 sec. After lasing, the tube was withdrawn from the root canal. All file tips were successfully removed from the root canal. We concluded that broken metallic instruments in the root canal could be removed by welding using Nd : YAG laser.