Dental Materials
Volume 25, Issue 1 , Pages 74-79, January 2009

Evaluation of crack propagation in dental composites by optical coherence tomography

  • Ana K.S. Braz

      Affiliations

    • Graduate Program in Odontology, Universidade Federal de Pernambuco, Recife, PE, Brazil
    • Corresponding Author InformationCorresponding author at: Graduate Program in Odontology, Universidade Federal de Pernambuco, Rua Washington Luís 51, Cabo de SantoAgostinho-Pernambuco 54510-440, Brazil. Tel.: +55 81 3524 0234/99223464.
    • ,
  • Bernardo B.C. Kyotoku

      Affiliations

    • Department of Physics Universidade Federal de Pernambuco, Recife, PE, Brazil
    • ,
  • Rodivan Braz

      Affiliations

    • Graduate Program in Odontology, Universidade de Pernambuco, Recife, PE, Brazil
    • ,
  • Anderson S.L. Gomes

      Affiliations

    • Graduate Program in Odontology, Universidade Federal de Pernambuco, Recife, PE, Brazil
    • Department of Physics Universidade Federal de Pernambuco, Recife, PE, Brazil

Received 18 April 2007; received in revised form 12 April 2008; accepted 15 April 2008.

Abstract 

Objectives

The purpose of this study was to image the sites of fracture initiation and slow crack propagation in a fiber reinforced composite, using the optical coherence tomography (OCT) technique.

Methods

Bar specimens (2mm×3mm×25mm) of fiber reinforced composite were mechanically and thermally cycled to emulate oral conditions. The interior of these samples was analyzed prior to and after loading, using OCT. The device used was a home-built Fourier domain OCT setup working at 800nm with 6μm spatial resolution.

Results

Intact specimens after load cycling were analyzed. It was clearly seen that OCT images provide an insight into crack propagation, which is not seen by the naked eye.

Significance

By using OCT the possibility of analyzing the fracture propagation quantitatively, and in depth, was added, opening up possibilities to quantitative studies.

Keywords: Optical coherence tomography, Crack propagation, Dental composites

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PII: S0109-5641(08)00142-5

doi:10.1016/j.dental.2008.04.011

Dental Materials
Volume 25, Issue 1 , Pages 74-79, January 2009

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