EFFECT OF SELF-ETCHING PRIMER APPLICATION ON THE CHARACTERISTICS & STRENGTH OF DENTIN BONDING IN PRIMARY TOOTH

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Journal of the Korean Academy of Pediatric Dentistry 1999;26(4):595-607.
Published online November 30, 1999.

EFFECT OF SELF-ETCHING PRIMER APPLICATION ON THE CHARACTERISTICS & STRENGTH OF DENTIN BONDING IN PRIMARY TOOTH

자가부식 프라이머의 처리가 유치의 상아질과 레진 간의 결합 형태와 강도에 미치는 효과

이준행, 김용기, 김종수

단국대학교 치과대학 소아치과학교실

Abstract

The purpose of this in vitro study was to evaluate the efficacy of self-etching primer which was developed to simplify the bonding procedures by measuring the shear bond strength and observing the interfacial morphology. 90 flat dentinal surfaces were prepared by grinding the buccal and lingual areas of caries-free human deciduous molars. After bonding of composite resin to sample surfaces according to the manufacturer's direction and thermocycling, shear bond strengths were measured using Universal testing machine(Instron). 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 as follows. 1. Group III showed higher shear bond strength than group I and II but no statistically significant difference was founded between group I and II(p>.05). 2. Adhesive failure was predominant in group II whereas dentin detachment was the main failure pattern in group I and III. 3. Relating long resin tags of 100-200μm were observed in samples of all groups under SEM. In group I, homogeneously long resin tags were arranged rather tight whereas rather loosely arranged resin tags of various length were found in group II. Lateral branching of resin tags was the characteristic finding observed in group III.

Key Words: Self-etching primer, Shear strength