The effect of cavity wall property on the shear bond strength test using iris method
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본 연구에서는 ‘전단접착강도 시험법에서 cohesive failure 를 줄일 수 있는 것으로 소개된 metal iris를 사용하면, 실제의 1급 와동에서보다 복합 레진과 와동벽의 결합이 없어서 C-factor 적게 작용하고 계면에 발생하는 수축 응력이 감소됨으로써, 임상에서보다 높은 결합력 값이 보고될 것이다.’라는 가설을 검증하기 위하여 dentin iris를 사용하여 전단접착강도를 측정하였다. 64개의 대구치를 4군으로 구분하여 metal iris와 dentin iris 군으로 구분하고, 그 각각을 ONE-STEP과 ALL-BOND 2의 두 군으로 나누었다. bonding agent를 적용하고, iris를 고정한 후, 복합 레진을 충전하여 시편을 완성하였다. 이 때 dentin iris의 경우 내면에도 bonding agent를 적용하여 와동벽과의 결합이 발생하게 하였다. 전단접착강도는 24시간 후 측정하였고, 파절의 양상은 주사전자현미경과 입체광학현미경을 이용하여 결정하였다. 전단접착강도 측정법에서 iris 법을 이용함으로써 cohesive failure를 줄일 수 있다. 전단접착강도 측정법은 adhesive 두께가 얇은 경우에 와동벽의 영향을 받는다.
Abstract
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. The occlusal dentin of 64 extracted human molars were randomly divided into 4 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. 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. 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.
참고문헌 (16)
- Buonocore MG, "A simple method of increasing the adhesion of acrylic filling materials to enamel surfaces", 34, pp.849~853 (1955)
- Finger WJ, "Dentin bonding agents" (1988), 184-188
- Retief DH, "Standardizing laboratory adhesion tests", 4, pp.231~236 (1991)
- Holtan JR, "Bond strength of six dentinal adhesives", 22, pp.92~96 (1993)
- Van Noort R, "A critique of bond strength measurement", pp.61~67
- Davison CL, "An investigation into the quality of dentine bonding systems for accomplishing a durable bond", 20, pp.291~300 (1993)
- Van Noort R, "A study of the interfacial shear and tensile stresses in a restored molar tooth", 16, pp.286~293 (1988)
- DeHoff PH, "Three-dimensional finite element analysis of the shear bond test", 11, pp.126~131 (1995)
- Versluis A,, "Why do shear tests pull out dentin?", 76(6), pp.1298~1307 (1997)
- Watanabe LG,, "Shear bond strength. Single plane vs. lap shear." (1988)
- Dickens SH 6 Milos MF, "Relationship of dentin shear bond strengths to different laboratory test designs", 15, pp.185~192 (2002)
- Cho BH, "Effect of interfacial bond quality on the direction of polymerization shrinkage flow in resin composite restorations", 27, pp.297~304 (2002)
- Van Noort R, "The effect of local interfacial geometry on the measurements of the tensile bond strength to dentin", pp.889~893
- Choi KK, "The effect of adhesive thickness on polymerization contraction stress of composite", 79(3), pp.812~817 (2000)
- Armstrong SR, "Effect of hybrid layer on fracture toughness of adhesively bonded dentin-resin composite joint", 14, pp.91~98
- Yoshikawa T,, "Effects of dentin depth and cavity configuration on bond strength", 4, pp.898~905 (1999)