Effect of different chlorhexidine application times on microtensile bond strength to dentin in Class I cavities
강현정, 문호진, 신동훈,
소속 상세정보
강현정 ( Kang Hyun-Jung ) - Dankook University School of Dentistry Department of Conservative Dentistry
문호진 ( Moon Ho-Jin ) - Dankook University School of Dentistry Department of Conservative Dentistry
신동훈 ( Shin Dong-Hoon ) - Dankook University School of Dentistry Department of Conservative Dentistry
KMID : 0362320120370010009
Abstract
Objectives: This study evaluated the effect of 2% chlorhexidine digluconate (CHX) with different application times on microtensile bonds strength (MTBS) to dentin in class I cavities and intended to search for ideal application time for a simplified bonding protocol.
Materials and Methods: Flat dentinal surfaces with class I cavities (4 mm × 4 mm × 2 mm) in 40 molar teeth were bonded with etch-and-rinse adhesive system, Adper Single Bond 2 (3M ESPE) after: (1) etching only as a control group; (2) etching + CHX 5 sec + rinsing; (3) etching + CHX 15 sec + rinsing; (4) etching + CHX 30 sec + rinsing; and (5) etching + CHX 60 sec + rinsing. Resin composite was built-up with Z-250 (3M ESPE) using a bulk method and polymerized for 40 sec. For each condition, half of the specimens were immediately submitted to MTBS test and the rest of them were assigned to thermocycling of 10,000 cycles between 5℃ and 55℃ before testing. The data were analyzed using two-way ANOVA, at a significance level of 95%.
Results: There was no significant difference in bond strength between CHX pre-treated group and control group at the immediate testing period. After thermocycling, all groups showed reduced bond strength irrespective of the CHX use. However, groups treated with CHX maintained significantly higher MTBS than control group (p < 0.05). In addition, CHX application time did not have any significant influence on the bond strength among groups treated with CHX.
Conclusion: Application of 2% CHX for a short time period (5 sec) after etching with 37% phosphoric acid may be sufficient to preserve dentin bond strength.
키워드
Application time; Chlorhexidine; Class I cavity; Etching; Microtensile bond strength; Thermocycling
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