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J Korean Acad Pediatr Dent. 2007;34(1): 62-72.
MICROTENSILE BOND STRENGTH ACCORDING TO DIFFERENT DENTIN WALL POSITIONS AND CURING LIGHTS IN CLASS I CAVITY OF PRIMARY MOLAR
이현헌, 장철호, 김영재, 김정욱, 장기택
서울대학교 치과대학 소아치과학교실 및 임상치의학연구소
Corresponding Author: 장기택 ,
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ABSTRACT
The purpose of present study was to determine whether different kinds of curing lights can alter microtensile bond strength(MTBS) of class I cavity pulpal and axial wall specimens in primary molar. Thirty clean mandibular 2nd primary molar's occlusal enamel were removed and class I cavity, size of 2×4×2mm was prepared. Dentin bonding agent was applied according to manufacturer's manual. Each group was cured with Halogen Curing Unit, Plasma Curing Unit and LED Curing Unit. Composite resin was bulk filled and photo cured with same curing unit. MTBS specimens which size is 0.7×0.7×4mm were prepared with low speed saw. Specimens were coded by their curing lights and wall positions (Halogen - Axial wall group, Halogen - Pulpal wall group, Plasma - Axial wall group, Plasma - Pulpal wall group, LED - Axial wall group, LED - Pulpal walt group). MTBS were tested at 1 mm/min cross Head speed by Universal Testing Machine. Fractured surface and bonding surface was observed with SEM. T-test between axial and pulpal specimens in each curing lights, one-way ANOVA among different curing light specimens in each wall positions were done. Weibull distribution analysis was done. The results were as follows : Mean MTBS of pulpal wall specimens were significantly greater than that of axial wall specimens at each curing units(p<.05). There was no significant difference in the MTBS among three curing units at axial wall and pulpal wall. In Weibull distribution, pulpal wall specimens were more homogeneous than axial wall specimens.
Keywords: Microtensile bond strength | Primary molar | Class I cavity | C-factor | Light curing unit | Weibull distribution analysis
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