Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effect of additional coating of bonding resin on the microtensile bond strength of self-etching adhesives to dentin

접착레진의 추가도포가 자가부식형 접착제의 상아질에 대한 미세인장접착강도에 미치는 영향

  • Jung, Moon-Kyung (Department of Conservative Dentistry, School of Dentistry, Seoul National University) ;
  • Cho, Byeong-Hoon (Department of Conservative Dentistry, Dental Research Institute, Intellectual Biointerface Engineering Center, Seoul National University) ;
  • Son, Ho-Hyun (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Seoul National University) ;
  • Um, Chung-Moon (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Seoul National University) ;
  • Han, Young-Chul (Department of Conservative Dentistry, School of Dentistry, Seoul National University) ;
  • Choung, Sae-Joon (Department of Conservative Dentistry, School of Dentistry, Seoul National University)
  • 정문경 (서울대학교 치과대학 치과보존학교실) ;
  • 조병훈 (서울대학교 치과대학 치과보존학교실, 치학연구소, 지능형 생체계면공학연구소) ;
  • 손호현 (서울대학교 치과대학 치과보존학교실, 치학연구소) ;
  • 엄정문 (서울대학교 치과대학 치과보존학교실, 치학연구소) ;
  • 한영철 (서울대학교 치과대학 치과보존학교실) ;
  • 정세준 (서울대학교 치과대학 치과보존학교실)
  • Published : 2006.03.01
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Abstract

This study investigated the hypothesis that the dentin bond strength of self-etching adhesive (SEA) might be improved by applying additional layer of bonding resin that might alleviate the pH difference between the SEA and the restorative composite resin. Two SEAs were used in this study; Experimental SEA (Exp, pH: 1.96) and Adper Prompt (AP, 3M ESPE, USA, pH: 1.0) In the control groups they were applied with two sequential coats In the experimental groups, after applying the forst coat of assigned SEAs, the D/E bonding resin of All-Bond 2 (Bisco Inc., USA, pH: 6.9) was applied as the intermediate adhesive. Z-250 (3M ESPE, USA) composite resin was built-up in order to prepare hourglass-shaped specimens . The microtensile bond strength (MTBS) was measured and the effect of the Intermediate layer on the bond strength was analyzed for each SEA using t-test. The fracture mode of each specimen was inspected using stereomicroscope and Field Emission Scanning Electron Microscope (FE-SEM). When D/E bonding resin was applied as the second coat, MTBS was significantly higher than that of the control groups . The incidence of the failure between the adhesive and the composite or between the adhesive and dentin decreased and that of the failure within the adhesive layer increased. According to the results , applying the bonding resin of neutral pH can increase the bond strength of SEAs by alleviating the difference in acidity between the SEA and restorative composite resin.

본 실험에서는 자가부식형 접착제와 콤포짓트 레진 사이의 산도의 차이를 완화시킬 수 있는 접착레진을 자가부식형 접착제 위에 추가적으로 도포할 경우, 상아질에 대한 접착력을 개선할 수 있는지를 연구하였다. 자가부식형 접착제로는 실험실에서 직접 제작한 실험용 자가부식형 접착제 (pH: 1.96)와 Adper Prompt (3M ESPE, VSA, pH: 1.0)를 사용하였으며, 중성의 접착레진으로 All-Bond 2의 D/E bonding resin (Bisco Inc., USA, pH: 6.9)을 사용하였다. 두 대조군에서는 두 가지 자가부식형 접착제를 각각 두번씩 도포하였으며, 두 실험군에서는 각 자가부식형 접착제를 한번 도포한 후 그 위에 D/E bonding resin을 추가 도포하였다. Z-250 하이브리드 복합레진을 쌓아올려 모레시계 형태의 시편을 제작하여 미세인장강도를 측정하고 t-test를 이용하여 비교하였다. 파절 양상은 입체현미경과 주사전자현미경을 이용하여 관찰하였다. D/E bonding resin을 추가 도포한 미세 인장접착강도는 유의하게 증가되었고, 접착층과 복합레진 또는 접착층과 상아질 사이의 파절을 보인 시편의 수는 감소하고, 접착층 내의 파절을 보인 시편의 수는 증가되었다. 따라서 자가부식형 접착제와 복합레진의 산도의 차이를 완화할 수 있는 중성의 접착레진을 추가 도포할 경우 미세인장접착강도를 증가시킬 수 있음을 확인하였다.

Keywords

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