Removal of intracanal broken instrument by laser welding.

1. 本文报道了一种用激光焊接去除管内破碎器械的新方法。我们改进了这种方法，使用直径0.5mm的不锈钢球从根管中去除细小的k形锉。本研究的目的是研究不锈钢球对破碎锉与不锈钢管之间激光焊接的影响。本实验使用了15个k锉尖。将一个不锈钢球插入上面提到的管子中，k形锉尖端的一端与球接触。然后用900mJ 10pps的Nd: YAG激光从焊管另一端照射1、2、3秒，最后用钳子评价焊接强度。除1个1秒辐照组外，其余样品均成功焊接。结果表明，采用Nd: YAG激光焊接可以去除根管内细小的k锉。用激光焊接法去除管内破损器械本研究的目的是探讨用激光焊接法从拔除的人牙中去除管内破损器械。实验中使用了30个k锉（#8-#25）。每个锉尖样本被插入拔出的人上颌切牙根管中。每个锉样放置在根尖附近，插入一根不锈钢管接触锉尖的冠状端。然后将Nd: YAG激光以400mJ 10pps照射1秒，激光照射后将根管从根管中取出。所有的锉尖都成功地从根管中取出。结果表明，采用Nd: YAG激光焊接法可以将根管内的金属器械破碎。

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 After lasing, the tube was withdrawn from the root canal.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