Dental Materials
Volume 23, Issue 5 , Pages 608-614, May 2007

A comparison of fatigue crack growth in resin composite, dentin and the interface

  • Matthew J. Soappman

      Affiliations

    • Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
    • ,
  • Ahmad Nazari

      Affiliations

    • Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
    • ,
  • Judith A. Porter

      Affiliations

    • Department of Restorative Dentistry, West Virginia University School of Dentistry, Robert C. Byrd Health Sciences Center North, PO Box 9495, Morgantown, WV 25606-9495, USA
    • ,
  • D. Arola

      Affiliations

    • Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
    • Corresponding Author InformationCorresponding author. Tel.: +1 410 455 3310; fax: +1 410 455 1052.

Received 12 January 2006; received in revised form 25 April 2006; accepted 10 May 2006.

Abstract 

Objectives

The objective of this in vitro study was to evaluate the fatigue crack growth properties of the dentin/resin adhesive interface.

Methods

Compact tension (CT) specimens were prepared from coronal dentin, resin composite, and dentin bonded to resin composite using Optibond Solo Plus adhesive. All specimens were then subjected to cyclic Mode I loading while fully hydrated at a stress ratio of R=0.1 and frequency of 5Hz. Steady state fatigue crack growth was modeled using the Paris Law in terms of the exponent (m) and coefficient (C).

Results

The average fatigue crack growth rates in the resin composite ranged from 1.6E−06 to 3.8E–05mm/cycle with growth occurring over a stress intensity range from 0.40 to 0.77MPam1/2; the average growth exponent was 6.9±3.1. Average fatigue crack growth rates for the dentin/resin interface specimens ranged from 5.5E−07 to 6.4E−03mm/cycle with growth occurring over a stress intensity range from 0.37 to 0.64MPam1/2. The Paris Law exponent for these specimens ranged from 16≤m≤25. Fatigue crack growth at the interface occurred primarily in the adhesive resin and at the adhesive–dentin interface. In addition, many of the dentin/resin specimens underwent unstable fracture at a comparatively low stress intensity range without undergoing cyclic crack growth.

Significance

The dentin/resin adhesive interface proved to be significantly more sensitive to fatigue crack growth than either dentin or resin composite. Variation in the cyclic crack growth responses of the dentin/resin interface specimens suggests that the interface, and particularly the adhesive resin, exhibits lower resistance to crack initiation and growth in comparison to dentin.

Keywords: Adhesive interface, Resin composite, Fatigue crack growth, Fracture

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PII: S0109-5641(06)00126-6

doi:10.1016/j.dental.2006.05.003

Dental Materials
Volume 23, Issue 5 , Pages 608-614, May 2007

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