Dental Materials
Volume 22, Issue 1 , Pages 45-56, January 2006

Micro-tensile bond strength of three luting resins to human regional dentin

  • Bin Yang

      Affiliations

    • Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University, Arnold-Heller-Strasse 16, 24105 Kiel, Germany
    • ,
  • Klaus Ludwig

      Affiliations

    • Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University, Arnold-Heller-Strasse 16, 24105 Kiel, Germany
    • ,
  • Rainer Adelung

      Affiliations

    • Multicomponent Materials, Faculty of Engineering, Christian-Albrechts University, Kiel, Germany
    • ,
  • Matthias Kern

      Affiliations

    • Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University, Arnold-Heller-Strasse 16, 24105 Kiel, Germany
    • Corresponding Author InformationCorresponding author. Tel.: +49 431 5972874; fax: +49 431 5972860.

Received 13 July 2004; received in revised form 28 January 2005; accepted 8 February 2005.

Summary 

Objectives

To evaluate the micro-tensile bonding strength (μTBS) 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 7.5N, in the self-curing mode. After storage for 1 or 3 days, μTBS was tested at a cross-head speed of 1mm/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 μTBS 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 μTBS, failed primarily cohesively in luting resin. μTBS of SB-d and SB-c were significantly higher than those of PF and RU. RU, with the lowest regional μTBS, 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.

Keywords: Micro-tensile bond, Regional dentin, Luting resin, TEM, SEM, Interface, Fractography

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PII: S0109-5641(05)00127-2

doi:10.1016/j.dental.2005.02.009

Dental Materials
Volume 22, Issue 1 , Pages 45-56, January 2006

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