광중합 Glass lonomer Cement의 결합 강도에 대한 실험적 연구 = EXPERIMENTAL STUDY OF BOND STRENGTH OF LIGHT-CURED GLASS IONOMER CEMENT

다국어 초록 (Multilingual Abstract)

The purpose of study was to compare bond strength of Light-cured Glass Ionomer Cement with those of Chemically-cured Glass Ionomer Cement and Composite Resin to enamel and dentin surface.
Each extracted molars, the buccal surfaces of which were flattened, were divided into two groups, so that 40 teeth their enamel exposed and the other 40 had their dentin exposed.
The materials used were:
1) FujiⅡ LC(Light-cured Glass Ionomer Cement)
2) FujiⅡ＆Shofu G.I typeⅡ(Chemically-cured Glass Iomomer Cement)
3) Silux Plus(Composite Resin)
Each of the materials was applied to the exposed surface of 10 teeth by insertion into a cylindericalshaped matrix which is 3mm diameter and 2mm in height.
The completed specimens were stored at 37。c under 100% humidity for 24 hours: then the shear bond strength of each material to enamel and dentin surface were measured with Instron universal testing machine.
The following results were obtained:
1. Bond strength to enamel surface increased in order of Shofu G.I typeⅡ, FujiⅡ, FujiⅡLC, and Silux Plus. Statistical significance was obserbed except for Shofu G.I typeⅡ and FujiⅡ, which are chemically-cured materials(p<0.01).
2. Bond strenght to dentin surface increased in order of Shofu G.I typeⅡ, FujiⅡ, Silux Plus, FujiⅡLC. There was statistical significance(p<0.05).
3. Bond strength to enamel surface was greater than that to dentin. There was statistical significance(p<0.01).
From such results, it can be concluded that when Glass Ionomer Cement is used for esthetic restoration, light-cured type, which has greater bond strenth to tooth structure, is preferred to chemically-cured type.