Journal of the Korean Academy of Pediatric Dentistry 2007;34(3):359-369.
Published online August 31, 2007.
The Effect of Surface Sealing on the Microleakage of Class V Composite Resin Restorations
Yeon-Hee Youn, Hong-Keun Hyun, Young-Jae Kim, Jung-Wook Kim, Ki-Taeg Jang, Sang-Hoon Lee, Chong-Chul Kim, Se-Hyun Hahn
Department of Pediatric Dentistry, School of Dentistry and Dental Research Institute, Seoul National University 
제V급 복합레진 수복물의 표면전색이 미세변연누출에 미치는 효과
윤연희, 현홍근, 김영재, 김정욱, 장기택, 이상훈, 김종철, 한세현
서울대학교 치과대학 소아치과학교실 및 치학연구소
Correspondence:  Se-Hyun Hahn,  Tel: 02-2072-3819, Fax: 02-744-3599, Email:
This in vitro study was performed to assess the effect of surface sealing on the microleakage of class V composite resin restorations that underwent several aging treatments. Class V cavities were prepared on the buccal surface of 100 sound extracted premolars and restored with a hybrid light-cured composite resin according to the manufacturer's instructions. They were randomly divided into two groups consisting of 50 samples: group I, without surface sealing, and group II, in which margins were etched and surface sealant was applied. After thermocycling, each group was divided into five subgroups, respectively, to represent the five aging treatments: group A = no further treatment (only thermocycling), B = toothbrushing, C = load cycling, D = toothbrushing followed by load cycling, and E = aging treatment in deionized water for six months. Microleakage was assessed by examining the penetration of 2% methylene blue dye. The following results were obtained: 1. At occlusal and cervical margins in groups without surface sealing, there was no significant difference in microleakage after the several aging treatments (p>0.05). 2. The occlusal margins of groups with surface sealing showed no significant differences after the several aging treatments (p>0.05). 3. In the cervical margins of groups with surface sealing, microleakage significantly increased after load cycling or aging in deionized water for six months (p<0.05). 4. The no-further-treatment group and the toothbrushing group with surface sealing showed less microleakage than the corresponding groups without surface sealing (p<0.05). 5. The surface-sealed groups with load cycling or aging in deionized water showed no significant difference in microleakage to the corresponding groups without surface sealing (p>0.05). In conclusion, the results of this study suggest that the surface sealant infiltrating through the gap of the cervical margin exerted a positive effect on microleakage at the initial stage, but the effect was not sufficient to overcome the stress generated by the cuspal flexure during occlusal loading and water absorption.
Key Words: Surface sealing, Microleakage, Toothbrushing, Load cycling, Water absorption

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