TY - JOUR
T1 - Effect of 2% chlorhexidine on dentin microtensile bond strengths and nanoleakage of luting cements
AU - Hiraishi, N.
AU - Yiu, C. K.Y.
AU - King, N. M.
AU - Tay, F. R.
N1 - Funding Information:
The authors thank Amy Wong of the Electron Microscopy Unit, The University of Hong Kong for technical assistance. The hybrid resin composite (ESTENIA C&B) used in this study were generous gifts from Kuraray Medical Inc. This work was supported by grant 10207401/14207/08004/323/01, 10204604/07840/08004/324/01 and 10207821.14207.8004.324.01, Faculty of Dentistry, the University of Hong Kong.
PY - 2009/6
Y1 - 2009/6
N2 - Objectives: The aim of this study was to investigate the effect of pre-treatment by chlorhexidine on the microtensile bond strength (mTBS) of resin cements and nanoleakage at the resin-dentine interfaces. Methods: Cylindrical composite blocks were luted to human dentine using resin cements (RelyX ARC, 3M ESPE: ARC; Panavia F, Kuraray Medical Inc.: PF; RelyX Unicem, 3M ESPE: UN) with/without pre-treatment by 2% chlorhexidine digluconate (CAVITY CLEANSER, Bisco, Inc., Schaumburg, IL, USA). CAVITY CLEANSER was applied on the acid etched dentine for 60 s in the ARC group, and on smear layer-covered dentine in the PF and UN groups. After storage in water for 24 h, the bonded teeth were sectioned into 1 mm thick slabs and further into 0.9 mm × 0.9 mm beams. After immersion in water or ammoniacal silver nitrate for 24 h, the beams were stressed to failure in tension. The fractured surfaces were examined by field-emission scanning electron microscopy (FE-SEM) using backscattered electron mode. The silver-stained slabs were used to examine nanoleakage within the bonded interface by FE-SEM. Results: The resin cement and chlorhexidine treatment had significant effects (p < 0.0001) on mTBS; while the storage media had no significant effect (p = 0.435). The mTBS of ARC was significantly higher than the other cements. Chlorhexidine reduced mTBS and produced pronounced nanoleakage when PF and UC were luted to dentine. Conclusions: Pre-treatment with chlorhexidine affected the integrity of dentine bonding with PF and UC, while there was no adverse effect on coupling of ARC.
AB - Objectives: The aim of this study was to investigate the effect of pre-treatment by chlorhexidine on the microtensile bond strength (mTBS) of resin cements and nanoleakage at the resin-dentine interfaces. Methods: Cylindrical composite blocks were luted to human dentine using resin cements (RelyX ARC, 3M ESPE: ARC; Panavia F, Kuraray Medical Inc.: PF; RelyX Unicem, 3M ESPE: UN) with/without pre-treatment by 2% chlorhexidine digluconate (CAVITY CLEANSER, Bisco, Inc., Schaumburg, IL, USA). CAVITY CLEANSER was applied on the acid etched dentine for 60 s in the ARC group, and on smear layer-covered dentine in the PF and UN groups. After storage in water for 24 h, the bonded teeth were sectioned into 1 mm thick slabs and further into 0.9 mm × 0.9 mm beams. After immersion in water or ammoniacal silver nitrate for 24 h, the beams were stressed to failure in tension. The fractured surfaces were examined by field-emission scanning electron microscopy (FE-SEM) using backscattered electron mode. The silver-stained slabs were used to examine nanoleakage within the bonded interface by FE-SEM. Results: The resin cement and chlorhexidine treatment had significant effects (p < 0.0001) on mTBS; while the storage media had no significant effect (p = 0.435). The mTBS of ARC was significantly higher than the other cements. Chlorhexidine reduced mTBS and produced pronounced nanoleakage when PF and UC were luted to dentine. Conclusions: Pre-treatment with chlorhexidine affected the integrity of dentine bonding with PF and UC, while there was no adverse effect on coupling of ARC.
KW - Chlorhexidine
KW - Dentine disinfectant
KW - Microtensile bond strength
KW - Nanoleakage
KW - Resin cement
KW - SEM
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U2 - 10.1016/j.jdent.2009.02.002
DO - 10.1016/j.jdent.2009.02.002
M3 - Article
C2 - 19269731
AN - SCOPUS:64549129100
SN - 0300-5712
VL - 37
SP - 440
EP - 448
JO - Journal of Dentistry
JF - Journal of Dentistry
IS - 6
ER -