Journal of Dentistry
Volume 37, Issue 5 , Pages 383-389, May 2009

The effect of custom adaptation and span-diameter ratio on the flexural properties of fiber-reinforced composite posts

  • Nicola M. Grande

      Affiliations

    • Department of Endodontics, Catholic University of Sacred Heart, Rome, Italy
    • ,
  • Gianluca Plotino

      Affiliations

    • Department of Endodontics, Catholic University of Sacred Heart, Rome, Italy
    • Corresponding Author InformationCorresponding author. Tel.: +39 3396910098; fax: +39 068072289.
    • ,
  • Pietro Ioppolo

      Affiliations

    • Technology and Health Department, Italian National Institute of Health, Rome, Italy
    • ,
  • Rossella Bedini

      Affiliations

    • Technology and Health Department, Italian National Institute of Health, Rome, Italy
    • ,
  • Cornelis H. Pameijer

      Affiliations

    • School of Dental Medicine, University of Connecticut, Farmington, CT, USA
    • ,
  • Francesco Somma

      Affiliations

    • Department of Endodontics, Catholic University of Sacred Heart, Rome, Italy

Received 10 November 2008; received in revised form 18 January 2009; accepted 19 January 2009.

Abstract 

Objectives

To evaluate whether custom modification resulting in an anatomically shaped post and whether the span/diameter ratio (L/D) would affect the mechanical properties of fiber-reinforced composite posts.

Methods

Preformed glass-fiber posts (Group 1) and modified glass-fiber posts (Group 2) and glass-fiber rods (Groups 3 and 4) (n=20) were loaded to failure in a three-point bending test to determine the maximum load (N), flexural strength (MPa) and flexural modulus (GPa). The span distance tested for Group 3 was 10.0mm, while for Group 4 was 22.0mm. Data were subjected to different statistical analysis with significance levels of P<0.05.

Results

The maximum load recorded for Groups 1 and 2 was 72.5±5.9N and 73.4±6.4N respectively, while for Groups 3 and 4 was 215.3±7N and 156.6±3.6N respectively. The flexural strength for Groups 1 and 2 was 914.6±53.1MPa and 1069.2±115.6MPa, while for Groups 3 and 4 was 685.4±22.2MPa and 899.6±46.1MPa. The flexural modulus recorded for Groups 1 and 2 was 32.6±3.2GPa and 33.4±2.2GPa respectively, while for Groups 3 and 4 was 13.7±0.3GPa and 34.4±0.3GPa respectively.

Conclusions

The flexural properties of an anatomically custom modified fiber post were not affected by the modification procedure and the span-diameter ratio is an important parameter for the interpretation of flexural strength and flexural modulus values.

Keywords: Endodontic posts, Root canal anatomy, Anatomical posts, Flexural properties

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PII: S0300-5712(09)00020-7

doi:10.1016/j.jdent.2009.01.007

Journal of Dentistry
Volume 37, Issue 5 , Pages 383-389, May 2009

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