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Combined effect of smear layer characteristics and hydrostatic pupal pressure on dentin bond strength of HEMA-free and HEMA-containing adhesives

Mahdan, Mohd. Haidil Akmal and Nakajima, Masatoshi and Foxton, Richard M. and Tagami, Junji (2013) Combined effect of smear layer characteristics and hydrostatic pupal pressure on dentin bond strength of HEMA-free and HEMA-containing adhesives. Journal of Dentistry, 41 (10). pp. 861-871. ISSN 0300-5712

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Objective This study evaluated the combined effect of smear layer characteristics with hydrostatic pulpal pressure (PP) on bond strength and nanoleakage expression of HEMA-free and -containing self-etch adhesives. Methods Flat dentine surfaces were obtained from extracted human molars. Smear layers were created by grinding with #180- or #600-SiC paper. Three HEMA-free adhesives (Xeno V, G Bond Plus, Beautibond Multi) and two HEMA-containing adhesives (Bond Force, Tri-S Bond) were applied to the dentine surfaces under hydrostatic PP or none. Dentine bond strengths were determined using the microtensile bond test (μTBS). Data were statistically analyzed using three- and two-way ANOVA with Tukey post hoc comparison test. Nanoleakage evaluation was carried out under a scanning electron microscope (SEM). Results Coarse smear layer preparation and hydrostatic PP negatively affected the μTBS of HEMA-free and -containing adhesives, but there were no significant differences. The combined experimental condition significantly reduced μTBS of the HEMA-free adhesives, while the HEMA-containing adhesives exhibited no significant differences. Two-way ANOVA indicated that for HEMA-free adhesives, there were significant interactions in μTBS between smear layer characteristics and pulpal pressure, while for HEMA-containing adhesives, there were no significant interactions between them. Nanoleakage formation within the adhesive layers of both adhesive systems distinctly increased in the combined experimental group. Conclusion The combined effect of coarse smear layer preparation with hydrostatic PP significantly reduced the μTBS of HEMA-free adhesives, while in HEMA-containing adhesives, these effects were not obvious. Clinical significance Smear layer characteristics and hydrostatic PP would additively compromise dentine bonding of self-etch adhesives, especially HEMA-free adhesives.

Item Type: Article (Journal)
Additional Information: 6272/44212
Uncontrolled Keywords: Dentine bond strength; One-step self-etch adhesives; HEMA; Hydrostatic pulpal pressure; Smear layer characteristics
Subjects: R Medicine > RK Dentistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Dentistry
Depositing User: DR mohd haidil akmal mahdan
Date Deposited: 13 Aug 2015 09:43
Last Modified: 13 Aug 2015 09:43
URI: http://irep.iium.edu.my/id/eprint/44212

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