Laser debonding of ceramic brackets using a 1940-nm Thulium Fiber Laser

Orthodontics is a branch of dentistry which related in correction of maloccculsions Bracket are small attachments and the part of the braces that attach to each tooth, After treatment they usually debond by conventional methods but this can cause mechanical damage on the enamel. Using lasers in debonding is a new kind of research area in debonding of ceramic brackets. Using lasers while debonding reduces the force of the bonds in adhesive resin that application easier and reduces the risk of enamel damage. However, the heat produced by some lasers can damage the tooth pulp. 5.5°C is accepted as the threshold value for difference in intrapulpal temperature. In this study 1940-nm Thulium Fiber Laser in CW (Continious mode) applied on polycrystalline ceramic brackets which are bonded on bovine teeth by Bis-GMA type adhesive resin. Breaking time and the load at the breaking point were measured. During that time, the changes in intrapulpal temperatures were recorded by a K-type Thermocouple. Laser parameters are determined such that intrapulpal temperature changes below the threshold value.