Removal of intracanal broken instrument by laser welding.

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 After lasing, the tube was withdrawn from the root canal.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