1940-nm tulyum fiber lazeri ile seramik braketlerin çikarilmasi

The aim of the study was to determine the proper laser paramaters for 1940-nm Thulium Fiber Laser for ceramic bracket removing. In order to assess the effectiveness of 1940-nm Thulium Fiber Laser in orthodontic ceramic bracket debonding , polycrystalline ceramic brackets were bonded to mandibular bovine teeth with adhesive agent . The samples were divided into 9 different groups , 11 in each , due to applied laser power and laser duration, debonding method used . In addition, there was a control group that had no laser application . The debonding process was performed by 1940-nm Thulium Fiber Laser in CW (continous mode ) . The efficency of the laser was investigated together with the required debonding forces and intrapulpal temperature changes . In this study, keeping intrapulpal temperature changes below the threshold value that is accepted 5.5 °C must be accepted as a must. In most of the lasing groups , the increase in intrapulpal temperature changes were observed almost below the threshold value 5.5 °C . The findings revealed that 1940-nm Thulium Fiber Laser irradiation could reduce the needed debonding force or SBS (shear bond strength ) values significantly compared to control group . Irradiation of the specimens by 1940-nm Thulium Fiber Laser caused almost more than 50 % reduction in the needed debonding force when compared to the control group. Different application methods : non-scanning and scanning were studied to assess the effects of the distinct configurations. Scanning method was tried to reduce the intrapulpal temperature rise during laser irradiation but in this study side effects of this method were faced . Different application methods did not create any remarkable differences. In the lasing groups with the energies 25 J and more , adhesive remnant has not been observed on the enamel surfaces.