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KMID : 0623920010110010041
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Dental Materials Journal, Seoul National University
2001 Volume.11 No. 1 p.41 ~ p.47
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EFFECT OF COLLAGEN REMOVAL ON THE SHEAR BOND STRENGTH OF ACETONE-BASED DENTIN BONDING AGENTS
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Jung Da-Woon
Kim Kang-Ho
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Abstract
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This study evaluated (1) the effect of collagen removal on the shear bond strength (SBS) of acetone-based dentin bonding agents (DBA), in comparison to ethanol-based DBA (2) the long-term effects of collagen removal on the SBS, and (3), the ultrastructure of resin-dentin interface under SEM.
The labial surface of 120 extracted human premolars and molars were ground to expose dentin, then polished with silicon carbide paper (#220, #600). The surfaces were randomly assigned to four treatment groups ; Group 1 DBA and Z250 composite resin was bonded to dentin surface; Group 2, same procedures as Group 1 with 10 % sodium hypochlorite (NaOCl) applicition for 1 minute after acid conditioning ; Group 3, same procedures as Group 1 with thermocycling (TC) for 5,000 cycles getween 5 and 55 ℃ ; Group 4, same procedures as Group 2 with TC for 5,000 cycles between 5 and 55 ℃.
The Scheffe post hoc test was used for statistical analysis. In two acetone based DBAs, collagen removed group resulted in a significant increase of the SBS before thermocyling (p<0.05). Afterthermocycling, there was no significant difference between the non collagen removed and collagen removed groups (p>0.05). The ethanol-based DBA showed no significant difference in SBS (regardless of sodium hypoohlorite application.) before and after TC The resin-dentin interfacial structure was examined was examined morphologically under SEM. Dentin surfaces with intact smear layer, after acid condtioning, and after additional 10 % NaOCl application after acid conditioning were also examined under SEM.
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