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근관치료시 Nd:YAG Laser 사용과 세척액에 따른 치근단 폐쇄효과의 비교
김진운,이희주,허 복 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.4
(Abstract) The application of Nd:YAG laser and irrigants to the root surface can change its surface configurations. The purpose of this study was to investigate the effects of Nd:YAG laser and irrigants on the apical seal of obturated canals. In this study. 66 single rooted teeth were randomly assigned to 4 group of 14 teeth each. 8 teeth were served us positive and negative controls. The teeth were divided into 6 groups as follows. Group A: Nd:YAG laser, 5% NaOCI + Rc-prep Group B: Nd:YAG laser, Saline Group C: 5%NaOCI + Rc-prep Group D: Saline Group E: Positive control Group F:Negative control 66 teeth were instrumented using Maillefer ProFile (Orifice Shapers, .04 taper, .06 taper, Dentsply, Switzerland). Two of each group were selected at random, and the canal wall surfaces were examined under a SEM. 12 teeth of each group were obturated using by lateral condensation technique. Specimens were immersed in india ink for 7days. decalcified by 10% nitric acid, dehydrated by 75, 80, 85, 90, 95 and 100% alcohol in order, cleared by methyl salicylate and then mesured of dye penetration with stereomicroscope(×15 magnification) and Image Pro plus. The data were analyzed statistically by one-way ANOVA test and Duncan's Multiple Range test The resuls were as fllows: 1. The mean leakage was 0.128±0.375 for group A. 0.237±0.325 for group B. 0.297±0.468 for groupC. 0.586±0.402 for group D.(p<0.05) 2. Group A had better sealing ability than Gfoup C, but there was statistically no significant differences.(p>0.05) 3. Group B had better sealing ability than Group D. and there was statistically significant difference.(p<0.05) 4. Group A had better sealing ability than Group B, but there was statistically no significant difference.(p>0.05) 5. Group C had better sealing ability than D. but there was statistically no significant difference.(p>0.05) 6. As a result of observation under SEM. Smear layers were removed in Group A, B but Smear layers were partially removed and smear plugs were remained in Group C. Smear layers were not removed in Group D. To be specially Melting of smear layer were showed in Group C 7. These results suggest that the laser has potential in reducing the apical microleakage of obturated canals.