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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한치과보존학회 Restorative Dentistry and Endodontics Restorative Dentistry and Endodontics 제33권 제2호
발행연도
2008.1
수록면
148 - 161 (14page)

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The purpose of this study was to evaluate the effect of chlorhexidine (CHX) on microtensile bond strength (μTBS) of dentin bonding systems. Dentin collagenolytic and gelatinolytic activities can be suppressed by protease inhibitors, indicating that MMPs (Matrix metalloproteinases) inhibition could be beneficial in the preservation of hybrid layers. Chlorhexidine (CHX) is known as an inhibitor of MMPs activity in vitro. The experiment was proceeded as follows : At first, flat occlusal surfaces were prepared on mid-coronal dentin of extracted third molars. GI (Glass Ionomer) group was treated with dentin conditioner, and then, applied with 2 % CHX. Both SM (Scotchbond Multipurpose) and SB (Single Bond) group were applied with CHX after acidetched with 37% phosphoric acid. TS (Clearfil Tri-S) group was applied with CHX, and then, with adhesives. Hybrid composite Z-250 and resin-modified glass ionomer Fuji-II LC was built up on experimental dentin surfaces. Half of them were subjected to 10,000 thermocycle, while the others were tested immediately. With the resulting data, statistically two-way ANOVA was performed to assess the μTBS before and after thermocycling and the effect of CHX. All statistical tests were carried out at the 95 % level of confidence. The failure mode of the testing samples was observed under a scanning electron microscopy (SEM). Within limited results, the results of this study were as follows; 1. In all experimental groups applied with 2 % chlorhexidine, the microtensile bond strength increased, and thermocycling decreased the microtensile bond strength (P > 0.05). 2. Compared to the thermocycling groups without chlorhexidine, those with both thermocycling and chlorhexidine showed higher microtensile bond strength, and there was significant difference especially in GI and TS groups. 3. SEM analysis of failure mode distribution revealed the adhesive failure at hybrid layer in most of the specimen, and the shift of the failure site from bottom to top of the hybrid layer with chlorhexidine groups. 2 % chlorhexidine application after acid-etching proved to preserve the durability of the hybrid layer and microtensile bond strength of dentin bonding systems.
#미세인장결합강도 #내구성 #Chlorhexidine #Microtensile bond strength #Durability #Chlorhexidine

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참고문헌 (36)

참고문헌 신청
Inoue S / 2001 / Effect of remaining dentin thickness and the use of conditioner on microtensile bond strength of glass ionomer adhesive / Dent Mater 17:445~455 google schola Lin A / 1992 / Studies on the adhesion of glass ionomer cements to dentin / J Dent Res 71:1836~1841 google schola Van Meerbeek B / 2001 / Adhesives and cements to promote preservation dentistry / Oper Dent 26:S119~S144 google schola Yoshida Y / 2000 / Evidence of chemical bonding at biomaterial-hard tissue interfaces / J Dent Res 79:709~714 google schola Gale MS / 1999 / Thermal cycling procedures for laboratory testing of dental restorations / J Dent 27:89~99 google schola

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