Removal of intracanal broken instrument by laser welding.

1.本文报告了一种用激光焊接技术取出根管内折断器械的新方法。我们改进了这种方法，使用直径为0.5mm的不锈钢球从根管中取出细K锉。本研究的目的是检查不锈钢球对激光焊接在一个破碎的文件和不锈钢管之间的影响。在该实验中使用了15个K锉尖端。将不锈钢球插入上述管中，使K锉尖端的断裂端与球接触。然后，通过管的另一端以900 mJ 10 pps照射Nd：YAG激光1、2和3秒。最后，使用一对钳子评估焊接强度。激光焊接是成功的，在所有样品中，除了一个n 1秒照射组。结论：1.采用Nd：YAG激光焊接根管内细小折断的K锉，可有效去除根管内细小折断的K锉.激光焊接根管内折断器械的取出本研究的目的是探讨使用这种方法从离体人牙中取出根管内折断器械。本实验中使用了30个K文件（#8-#25）。将每个锉尖样品插入到提取的人上颌切牙的根管中。将每个锉样品定位在根尖附近，并插入不锈钢管以接触锉尖的冠状端。然后，以400 mJ 10 pps照射Nd：YAG激光1秒。激光照射后，将管从根管中取出。所有锉尖均成功从根管中取出。我们的结论是，根管中断裂的金属器械可以通过使用Nd：YAG激光焊接来去除。

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 After lasing, the tube was withdrawn from the root canal.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.