Iris 법을 이용한 전단접착강도 측정에서 와동벽의 영향
The effect of cavity wall property on the shear bond strength test using iris method
소속 상세정보
Kim, Dong-Hwan/김동환
Bae, Ji-Hyun/Cho, Byeong-Hoon/Lee, In-Bog/Baek, Seung-Ho/Ryu, Hyun-Mi/Son, Ho-Hyun/배지현/조병훈/이인복/백승호/유현미/손호현
KMID : 0362320040290020170
Abstract
목적:본연구에서는 ´전단접착강도 시험법에서 cohesive failure를 줄일수 있는 것으로 소개된 metal iris를 사용하면, 실제의 1급 와동에서 보다 복합 레진과 와동벽의 결합이 없어서 C-factor적게 작용하고 계면에발생하는 수축 응력이 감소됨으로써 임상에서보다 높은 결합력 값이 보고될 것이다. 라는 가설을 검증하기 위하여 dentin iris를 사용하여 전단접착강도를 측정하였다.
방법:64개의 대구치를 4군으로 구분하여 metal iris와 dentin iris군으로 구분하고, 그 각각을 ONE-STEP과 ALL-BOND2의 두군으로 나누었다.bonding agent를 적용하고 iris를 고정한후 복합 레진을 충전하여 시편을 완성하였다.이때 dentin iris의경우 내면에도 bonding agent를 적용하여 외동벽과의 결합이 발생하게 하였다.전단접착강도는 24시간 후 측정하엿고, 파절의 양상은 주사전자현미경과 입체광학현미경을 이용하여 결정하였다.
결과:전단접차강도 측정법에서 iris법을 이용함으로써 cohesive failure를 줄일수 있다.전단접착강도 측정법은 adhesive두께가 얇은 경우에 왇오벽의영향을 받는다[
Objectives. In the unique metal iris method, the developing interfacial gap at the cavity floor resulting from the cavity wall property during polymerizing composite resin might affect the nominal shear bond strength values. The aim of this study is to evaluate that the iris method reduces the cohesive failure in the substrates and the cavity wall property effects on the shear bond strength tests using iris method.
Materials and Methods The occlusal dentin of 64 extracted human molars were randomly divided into l groups to simulate two different levels of cavity wall property (metal and dentin iris) and two different materials (ONE-STEP^(®) and ALL-BOND^(®) 2) for each wall property. After positioning the iris on the dentin surface, composite resin was packed and light-cured. After 24 hours the shear bond strength was measured at a crosshead speed of 0.5 mm/min. Fracture analysis was performed using a microscope and SEM. The data was analyzed statistically by a two-way ANOVA and t-test.
Results The shear bond strength with metal iris was significant higher than those with dentin iris (p = 0.034). Using ONE-STEP^(®), the shear bond strength with metal iris was significant higher than those with dentin iris (p = 0.005), but not in ALL-BOND^(®) 2 (p = 0.774). The incidence of cohesive failure was very lower than other shear bond strength tests that did not use iris method.
Conclusions The iris method may significantly reduce the cohesive failures in the substrates. According to the bonding agent systems. the shear bond strength was affected by the cavity wall property.
(J Kor Acad Cons Dent 29(2):170-176, 2004)
키워드
Shear bond test;Iris method;Fracture mode; C-factor; Bonding agent;전단접착강도. Iris 법;파절 양상;Bonding agent;C-factor
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