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The purpose of this study was to evaluate the effects of CO<SUB>2</SUB> laser irradiation on penetration of constricted canals.<BR>Root canals of human extracted teeth were opened by the usual method, and penetration of constricted canals to the apical foramen was performed with #15k-files.<BR>Fifteen canals, including eight incisors and seven premolars that could not be penetrated, were selected as the constricted specimens (n=15).<BR>These specimens were irradiated by a CO<SUB>2</SUB> laser (E16, 9W, 0.5sec).<BR>After the irradiation, penetration to the apical foramen with #15 k-files was attempted.<BR>After the laser irradiation, the rate of penetration to the apical foramen was evaluated.<BR>The root surface temperature was also measured by an infrared thermometer before, during, and after the irradiation.<BR>Ten canals (67%) could be penetrated to the apical foramen.<BR>The root surface temperature increased during the irradiation.<BR>The CO<SUB>2</SUB> laser irradiation could penetrate to the apical foramen; the mean rate of the penetration distance was 0.78±0.39mm (n=15).<BR>This study suggested that CO<SUB>2</SUB> laser irradiation can penetrate a constricted root canal to the apical foramen.
- 日本レーザー歯学会の論文