Micro-tensile bond strength of three luting resins to human regional dentin Bin Yang a , Klaus Ludwig a , Rainer Adelung b , Matthias Kern a, * a Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University, Arnold-Heller-Strasse 16, 24105 Kiel, Germany b Multicomponent Materials, Faculty of Engineering, Christian-Albrechts University, Kiel, Germany Received 13 July 2004; received in revised form 28 January 2005; accepted 8 February 2005 KEYWORDS Micro-tensile bond; Regional dentin; Luting resin; TEM; SEM; Interface; Fractography Summary Objectives: To evaluate the micro-tensile bonding strength (mTBS) of three luting resins to human regional dentin. Methods: Dentin disks from non-carious third molars were prepared from different regions (s, superficial dentin; d, deep dentin; c, cervical dentin), and divided into groups based on anatomical locations and luting resins (Super-Bond C&B: SB; Panavia F 2.0: PF; RelyX Unicem: RU): SB-s, SB-d, SB-c; PF-s, PF-d, PF-c; RU-s, RU-d, RU-c. Luting resins were used according to the manufacturers’ instructions, to bond 1-mm- diameter PMMA or composite rods to the exposed dentin specimens under a load of 7.5 N, in the self-curing mode. After storage for 1 or 3 days, mTBS was tested at a cross-head speed of 1 mm/min. Data were analyzed with ANOVA and Fisher’s PLSD test. The bonding interface and fractography analyses were performed with SEM and TEM. Results: ANOVA results showed that mTBS to superficial dentin was significantly higher than to deep or cervical dentin for all three luting resins. SB-s and PF-s, with the highest mTBS, failed primarily cohesively in luting resin. mTBS of SB-d and SB-c were significantly higher than those of PF and RU. RU, with the lowest regional mTBS, failed mostly within demineralized dentin. SEM and TEM showed that adhesive failures in SB and PF occurred at the top of the hybrid layer (HL), but no obvious HL was observed in RU. Significance: Luting resins with different chemical formulations and applications yield significantly different bond strengths to different regions in human dentin. Q 2005 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. Introduction Resin cements are increasingly used for luting all- ceramic, metal or composite indirect restorations due to their excellent mechanical properties, better bond strengths and improved esthetics Dental Materials (2006) 22, 45–56 www.intl.elsevierhealth.com/journals/dema 0109-5641/$ - see front matter Q 2005 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. doi:10.1016/j.dental.2005.02.009 * Corresponding author. Tel.: C49 431 5972874; fax: C49 431 5972860. E-mail address: [email protected] (M. Kern).
Micro-tensile bond strength of three luting resins to human regional dentin
May 20, 2023
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