INFLUENCE OF THE ENAMEL TREATMENT WITH ER:YAG LASER ON THE MICROLEAKAGE OF PIT AND FISSURE SEALANT

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Journal of the Korean Academy of Pediatric Dentistry 2006;33(2):192-200.
Published online May 31, 2006.

INFLUENCE OF THE ENAMEL TREATMENT WITH ER:YAG LASER ON THE MICROLEAKAGE OF PIT AND FISSURE SEALANT

Er:YAG 레이저를 이용한 법랑질 표면처리가 치면열구전색제의 미세누출에 미치는 영향

이지현, 김재문, 김신, 정태성

부산대학교 치과대학 소아치과학교실

Correspondence: ,

Abstract

The aim of this study was to assess the microleakage underneath a pit and fissure sealant bonded to occlusal surfaces treated by Er:YAG laser To determine the most effective energy density of laser, fourteen specimens were irradiated from 50mJ to 300mJ at 3Hz. After irradiation, the lased specimens were observed under the scanning electron microscope. Thirty six non-carious extracted premolars were randomly assigned to four groups of nine teeth: group 1, no treatment on the occlusal surface; group 2, acid etching for 15 seconds; group 3, Er:YAG laser irradiation; group 4, acid etching followed by Er:YAG laser irradiation. The pits and fissures were sealed with unfilled sealant(Helioseal F) and the specimen teeth were thermo-cycled, immersed in 2% Rhodamine B solution, longitudinally sectioned and analyzed for microleakage with fluorescent microscope. The results were as follows: 1. Er:YAG lased surfaces with 50mJ, 3Hz showed a similar pattern of irregularity with acid etched enamel surfaces 2. The mean microleakage score increased in the order of group 2, 4, 3 and 1. There was no significant difference among group 1, 3 and 4(p>0.05), however group 2 showed significantly less microleakage compared with group 1 and 3. Conclusively, the laser irradiation seemed not enough to replace the acid etching for proper retention of pit and fissure sealants.

Key Words: Pit and fissure sealant, Microleakage, Laser etching, Er:YAG laser