Abstract
A fine flexible glass fiber made of quartz has been developed to transmit laser beams more effectively to a specific area. This may increase the potential usefulness of the Nd: YAG laser for root canal treatment. Recent investigations revealed that colloidal TiO2 irradiated by lasers generated laser photolysis and electron paramagnetic resonance (EPR). The aim of this study was to evaluate root canal preparation using Nd: YAG laser with TiO2 solution.Twenty-seven roots removed at 11mm from the apex were used. Root canal patency was confirmed using a No.10 K-file. Then, each sample was fixed to a movable stage, and the fiber tip was inserted near to the apex. The root canal walls were irradiated for 10 sec by Nd: YAG laser. The fiber tip was moved from the apical portion of the root canal towards the canal orifice at a speed of 1mm/sec. The root canal was filled with 5% TiO2 solution during lasing. As to laser irradiating parameters, the output energy was 120mJ, pulse frequency was 15, 30 and 60pps, and the repetition of lasing was 2, 4 and 8 times. Before lasing, the fiber was processed by Nd: YAG laser irradiation through itself in TiO2 solution for 30 sec. This procedure changed the laser irradiating pattern from straight to spherical. The lased samples were evaluated by contact microradiography, digital microscopy and scanning electron microscopy. The mean rates of increase of longitudinal cross sectional root canal space were 100.13±5.51% (15pps, 2 times), 94.42±14.37% (15pps, 4 times), 97.91±8.02% (15pps, 8 times), 100.16±20.88% (30pps, 2 times), 120.52±16.40% (30pps, 4 times), 103.55±10.66% (30pps, 8 times), 102.41±8.46% (60pps, 2 times), 101.01±24.54% (60pps, 4 times), and 96.13%±1625% (60pps, 8 times), respectively. No carbonization of the lased dentin surfaces was observed by digital microscopy and scanning electron microscopy when pulse repetition rate was less than 20pps. In conclusion, the lasing parameters of pulse energy 120mJ and repetition rate 30pps may be appropriate for Nd: YAG laser irradiation of root canals filled with TiO2 solution.
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