抄録
The purpose of this study was to clarify that performing the sealant procedure in the cleanest possible condition, following laser irradiation, helps to increase the probability of maintenance. This study included 45 upper first premolars that were removed for the purpose of occlusal guidance. The methods for fissure cleaning were 1) using brush cone alone, 2) using a brush cone and 3 % NaOCl, and 3) using a brush cone and laser irradiation. After each treatment, sealant was applied following acid etching treatment. Nd: YAG laser (20 pps, 100mJ, 2w, one shot mode 20sec, without using black ink) was used for the irradiation. A laser irradiation was done for fissure cleaning, and then sealant was applied. After that, the state of a dental pulp was examined. The following conclusions were obtained:
(1) The procedure using a brush cone and laser irradiation was the most effective for the cleaning debris from the fissure and less destructive to the fissure structure.
(2) When the laser irradiation was performed before acid etching, the leakage between enamel and sealant was the smallest.
(3) The harmful effect of laser irradiation without using black ink was less influential on the dental pulp tissue, in the present study.
(J. Jpn. Soc. Laser Dent. 12: 21-36, 2001 Reprint requests to Dr. NAMIOKA)
