산 처리가 상아질 접착에 미치는 영향
EFFECT OF ACID-TREATMENT ON DENTIN BONDING
신경호, 최태진, 허영구,
소속 상세정보
신경호 ( ) - 경희대학교 식품공학과
최태진 ( ) - 경희대학교 식품공학과
허영구 ( ) - 경희대학교 식품공학과
KMID : 0362319930180010073
Abstract
The purpose of this study was to evaluate the effect of various acid treatments on dentin bonding.
Freshly extracted human teeth were uprightly embedded in self curing acrylic resin, and their occlusal surfaces were grinded to expose flat dentin surfaces. The specimens were divided into 4 grpups. Specimens of one group were not treated so as
to
be a
control and those of the other three groups were threated with 10% polyacrylic acid, 10% phosphoric acid, and 10-3 solution(10% citric acid/3% ferric chloride) respectively. Primer, bonding resin and composite resin were applied over the treated
dentin
surfaces sequentially. All specimens were stored in 37℃ distilled water for 24 hours, then the tensile bond strength was measured and the treated dentin surfaces and fracured dentin surfaces were examined under a scanning electron microscope.
@ES The results were as follows;
@EN Bond strengths of acid-treated groups were higher than those of the untreated group. In the acid-treated group, bond strength was found to be the highest in the 10-3 solution group followed by the 10% phosphoric acid group and the 10%
polyacrylic
acid group(P<0.01).
On SEM examination of dentin surfaces, the untreated dentin surface showed a remaining smear layer and closed dentinal tubules. Dentin surfaces treated with 10% polyacrylic acid showed a clean dentin surface without the smear layer, but showed
remaining
smear plugs in dentinal tubules. A dentin surface treated with 10% phosphoric acid or 10-3 solution showed open dentinal tubules without the smear layer or smear plugs.
On SEM observation of the fractured dentin-resin interface, the untreated group showed that failure occurred in the smear layer. The group treated with 10% polyacrylic acid showed no resin tag remained in the dentinal tubules, but resin tags in
the
dentinal tubules were observed in the group treated with the 10% phosphoric acid or the 10-3 solution.
On the failure mode examination, the higher the bond strength of the group, the higher the frequency of cohesive failure. The coefficient between bond strength and cohesive failure rate was 0.71.
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