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Removal of broken instruments from the root canal is often time-consuming and extremely difficult. We reporteda new method of removing intracanal broken instruments using laser welding (9th ISLD, 2004). In short, broken K-files witha tip diameter of more than 0.25mm had been successfully welded to a stainless-steel tube (inner diameter: 0.5 mm). We improved this method to remove K-files (tip diameter: 0.25 mm) from the root canal using a stainless-steel ball with a diameterof 0.5 mm. The objective of this study was to examine the effects of the stainless-steel ball on laser welding between brokenfiles and stainless-steel tubes.<BR>Fifteen K-file tips were used in this experiment. Inserting the stainless-steel ball into the tube mentioned above, the brokenend of each K-file tip was contacted with the ball. Then, Nd: YAG laser was irradiated through the other end of the tube at 900mJ, 10 pps for 1, 2 and 3 sec. Finally the strength of the welding was evaluated using a pair of pliers and a tensile test wasperformed.<BR>The results were as follows: Laser welding was successful in all samples except one in the 1-sec irradiation group. In the 2-sec irradiation group, themeasured tensile welding strength was 25.5N. This may be strong enough to remove broken files from the root canal.<BR>We concluded that fine broken K-files in the root canal could be removed by laser welding using Nd: YAG laser.
日本レーザー歯学会の論文