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The effect of the strength and wetting characteristics of Bis-GMA/TEGDMA-based adhesives on the bond strength to dentin

2,2-Bis[4-(2-methoxy-3-methacryloyloxy propoxy) phenyl] propane을 함유한 상아질 접착레진의 물성이 접착강도에 미치는 영향

  • Park, Eun-Sook (Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute) ;
  • Kim, Chang-Keun (School of Chemical Engineering and Materials Science, Chung-Ang University) ;
  • Bae, Ji-Hyun (Department of Conservative Dentistry, Section of Dentistry, Seoul National University Bundang Hospital) ;
  • Cho, Byeong-Hoon (Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute)
  • 박은숙 (서울대학교 치의학대학원 치과보존학교실) ;
  • 김창근 (중앙대학교 공과대학) ;
  • 배지현 (분당서울대학교병원 치과보존과) ;
  • 조병훈 (서울대학교 치의학대학원 치과보존학교실)
  • Received : 2011.03.02
  • Accepted : 2011.03.06
  • Published : 2011.03.31

Abstract

Objectives: This study investigated the effect of the strength and wetting characteristics of adhesives on the bond strength to dentin. The experimental adhesives containing various ratios of hydrophobic, low-viscosity Bis-M-GMA, with Bis-GMA and TEGDMA, were made and evaluated on the mechanical properties and bond strength to dentin. Materials and Methods: Five experimental adhesives formulated with various Bis-GMA/Bis-MGMA/TEGDMA ratios were evaluated on their viscosity, degree of conversion (DC), flexural strength (FS), and microtensile bond strength (MTBS). The bonded interfaces were evaluated with SEM and the solubility parameter was calculated to understand the wetting characteristics of the adhesives. Results: Although there were no significant differences in the DC between the experimental adhesives at 48 hr after curing (p > 0.05), the experimental adhesives that did not contain Bis-GMA exhibited a lower FS than did those containing Bis-GMA (p < 0.05). The experimental adhesives that had very little to no TEGDMA showed significantly lower MTBS than did those containing a higher content of TEGDMA (p < 0.05). The formers exhibited gaps at the interface between the adhesive layer and the hybrid layer. The solubility parameter of TEGDMA approximated those of the components of the primed dentin, rather than Bis-GMA and Bis-M-GMA. Conclusions: To achieve a good dentin bond, a strong base monomer, such as Bis-GMA, cannot be completely replaced by Bis-M-GMA for maintaining mechanical strength. For compatible copolymerization between the adhesive and the primed dentin as well as dense cross-linking of the adhesive layer, at least 30% fraction of TEGDMA is also needed.

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