V급 와동에서 심미성 수복재의 충전 방법에 따른 변연누출에 관한 실험적 연구

AN EXPERIMENTAL STUDY ON THE MARGINAL LEAKAGE ACCORDING TO THE FILLING METHOD OF THE ESTHETIC MATERIALS IN CLASS V CAVITIES

The purpose of this study was to evaluate the marginal leakage of esthetic restorative materials according to the filling method in class V cavities. 60 cavities were prepared on buccal surface for dye penetration test and divided into 5 experimental groups according to the filling methods of esthetic materials: group 1 was filled with glass ionomer cement, group 2, 3 and 4 were filled with the chamfer, knife edge and butt joint shaped glass ionomer cement respectively and silux plus/scotchbond 2$^{(R)}$ by sandwich technique, group 5 was lined with Dycal$^{(R)}$ and filled with silux plus/scotchbond 2$^{(R)}$ by bulk filling technique. All the specimens were then thermocycled in a range of $4^{\circ}C-60^{\circ}C$ by and immersed in 2% methylene blue dye solution for 24 hours, and sectioned mesiodistally with carborundum disk into two parts under water spray. All the specimens were observed at the occlusal and gingival margins and statistical analysis was performed. The obtained results were as follows : 1. At the occlusal margins, group 2, 3, 4 and 5 showed less marginal leakage than group 1 (p<0.05) and there were not significant differences among group 2, 3, 4, and 5. 2. At the gingival margins, group 5 showed the least marginal leakage and group 4 and 5 showed less marginal leakage than group 1, 2 and 3 (p<0.05). 3. In the laminated groups, group 4 showed less marginal leakage than group 2 and 3 at the gingival margins. 4. In comparison to the occlusal and gingival margins, all groups showed less marginal leakage at the occlusal margins than at the gingival margins (p<0.05).