Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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EFFECT OF FILM THICKNESS OF RESIN CEMENT ON BONDING EFFICIENCY IN INDIRECT COMPOSITE RESTORATION

레진 시멘트의 film thickness가 간접 복합 레진 수복물의 접착 효율에 미치는 영향에 관한 연구

  • Lee, Sang-Hyuck (Department of Conservative Dentistry, Division of Dentistry, Graduate of Kyung Hee University) ;
  • Choi, Gi-Woon (Department of Conservative Dentistry, Division of Dentistry, Graduate of Kyung Hee University) ;
  • Choi, Kyung-Kyu (Department of Conservative Dentistry, Division of Dentistry, Graduate of Kyung Hee University)
  • 이상혁 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 최기운 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 최경규 (경희대학교 대학원 치의학과 치과보존학교실)
  • Received : 2009.10.14
  • Accepted : 2010.03.05
  • Published : 2010.03.31
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Abstract

The purpose of this study was to evaluate the effect of film thickness of various resin cements on bonding efficiency in indirect composite restoration by measurement of microtensile bond strength, polymerization shrinkage, flexural strength and modulus, fractographic FE-SEM analysis. Experimental groups were divided according to film thickness (< $50\;{\mu}m$-control, $50\;{\mu}m$-T50, $100\;{\mu}m$-T100, $150\;{\mu}m$-T150) using composite- based resin cements (Variolink II, Duo-Link) and adhesive-based resin cements (Panavia F, Rely X Unicem). The data was analyzed using ANOVA and Duncan's multiple comparison test (p < 0.05). The results were as follows ; 1. Variolink II showed higher microtensile bond strength than that of adhesive-based resin cements in all film thickness (p < 0.05) but Duo-Link did not show significant difference except control group (p > 0.05). 2. Microtensile bond strength of composite-based resin cements were decreased significantly according to increasing film thickness (p < 0.05) but adhesive-based resin cements did not show significant difference among film thickness (p > 0.05). 3. Panavia F showed significantly lower polymerization shrinkage than other resin cements (p < 0.05). 4. Composite-based resin cements showed significantly higher flexural strength and modulus than adhesive-based resin cements (p < 0.05). 5. FE-SEM examination showed uniform adhesive layer and well developed resin tags in composite-based resin cements but unclear adhesive layer and poorly developed resin tags in adhesive-based resin cements. In debonded surface examination, composite-based resin cements showed mixed failures but adhesive-based resin cements showed adhesive failures.

본 연구는 여러 레진 시멘트의 film thickness에 따른 상아질과 간접 레진 수복물 간의 미세인장 결합 강도를 측정하고, 각 레진 시멘트의 중합 수축 및 굴곡 강도, 탄성 계수를 비교 분석하며, 접착 계면 및 파단면의 주사전자 현미경 관찰을 통하여 레진 시멘트의 film thickness가 레진 간접 수복물의 접착 효율에 미치는 영향을 평가하고자 시행하였다. 복합 레진형 레진 시멘트인 Variolink II와 Duo-Link, 접착형 레진 시멘트인 Panavia F와 Rely X Unicem의 4가지 레진 시멘트를 사용하였고, 각각의 시멘트를 film thickness에 따라 < $50\;{\mu}m$ (control)의 대조군과 $50\;{\mu}m$ (T50), $100\;{\mu}m$ (T100), $150\;{\mu}m$ (T150)의 실험군으로 나누어 총 16개의 군으로 분류하였다. 데이터는 ANOVA와 Duncan's multiple comparison test (p < 0.05)를 이용하여 통계 분석하였으며 다음과 같은 결론을 얻었다; 1. Variolink Ⅱ는 모든 film thickness에서 접착형 레진 시멘트보다 높은 결합 강도를 나타냈지만(p < 0.05), Duo-Link는 대조군을 제외하고는 통계학적 유의차가 없었다(p > 0.05). 2. Film thickness가 증가할수록 복합 레진형 레진 시멘트의 결합 강도는 유의성 있게 감소(p < 0.05)하는 경향을 보인 반면, 접착형 레진 시멘트는 통계학적 유의차가 없었다(p > 0.05). 3. Panavia F는 통계학적으로 유의성 있게 낮은 중합 수축량을 나타냈다(p <0.05). 4. 굴곡 강도와 탄성 계수는 복합 레진형 레진 시멘트가 접착형 레진 시멘트보다 유의성 있게 높게 나타났다(p < 0.05). 5. FE-SEM 관찰 결과 결합 강도가 높은 복합 레진형 레진 시멘트는 균일한 접착층과 잘 발달된 resin tag 소견을 보였으나, 접착형 레진 시멘트는 불분명한 접착층과 resin tag 소견을 나타냈다. 파단면 관찰에서 복합 레진형 레진 시멘트는 혼합형 파괴 양상을 나타냈으나 접착형 레진 시멘트는 접착성 파괴 양상을 나타냈다.

Keywords

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