SHEAR BOND STRENGTH OF

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Journal of the Korean Academy of Pediatric Dentistry 2000;27(3):444-456.
Published online August 31, 2000.

SHEAR BOND STRENGTH OF "ONE-BOTTLE ADHESIVE" SYSTEM IN PRIMARY DENTIN

One-Bottle 상아질 결합제의 유치 상아질에 대한 전단 결합 강도에 관한 연구

김종빈, 김종수

단국대학교 치과대학 소아치과학교실

Abstract

To test the shear bond strength of a new "one-bottle adhesive" system to primary dentin two commercially available one-bottle adhesives (Prime & Bond NT, Single bond) and conventional three step system(Scotchbond Multi-Purpose Plus) were included for comparison. And We observe the interfacial morphology by scanning electron microscope. 90 primary molar teeth were embedded in acrylic and buccal and lingual surface were polished to 320 grit to create standardized dentin surface for testing. After bonding of composite resin to sample surfaces according to the manufacturer s direction and 1000 times thermocycling in dwell time 30 second, Shear bond strengths of adhesives to dentin were determined using universal testing machine and analyzed by ANOVA test. Another groups of specimens were treated by hydrochloric acid to secure the resin only and those tags were evaluated under SEM for their length and forms and the morphology of the bonding sites were also observed. The result are as follows. 1. Group I(Prime & Bond NT) showed higher shear bond strength than group iI(Single Bond) and III(Scotchbond Multi Purpose Plus) but no statistically significant difference was founded between groups(p>.05). 2. Relating long resin tags of 70-120μm were observed in samples of all groups under SEM. We could observed hybrid layer, resin tag and many lateral branches in every group. But, we observed in group III rare lateral branched than other two group and discontinuous hybrid layer.

Key Words: One-bottle adhesive, Primary dentin, Shear bond strength, Scanning electron microscope