Effect of damping properties on fracture resistance of root filled premolar teeth: a dynamic finite element analysis

  1. K-L. Ou1,2,
  2. C-C. Chang3,
  3. W-J. Chang4,
  4. C-T. Lin4,
  5. K-J. Chang4,
  6. H-M Huang1

Article first published online: 22 JUN 2009

DOI: 10.1111/j.1365-2591.2009.01570.x

Issue

International Endodontic Journal

International Endodontic Journal

Volume 42, Issue 8, pages 694–704, August 2009

Additional Information

How to Cite

Ou, K.-L., Chang, C.-C., Chang, W.-J., Lin, C.-T., Chang, K.-J. and Huang, H.-M. (2009), Effect of damping properties on fracture resistance of root filled premolar teeth: a dynamic finite element analysis. International Endodontic Journal, 42: 694–704. doi: 10.1111/j.1365-2591.2009.01570.x

Author Information

  1. 1

    Graduate Institute of Biomedical Materials and Engineering, Taipei Medical University

  2. 2

    Research Center for Biomedical Implant and Microsurgery Device, Taipei Medical University

  3. 3

    Department of Dentistry, Taipei City Hospital, RenAi Branch

  4. 4

    Department of Dentistry, Taipei Medical University, Taipei, Taiwan

*Dr Haw-Ming Huang, Graduate Institute of Biomedical Materials & Engineering, Taipei Medical University, 250 Wu-Hsing Street, Taipei, Taiwan (Tel.: 886 2 2736 1661; ext. 5128; fax: +886 2 27362295; e-mail: hhm@tmu.edu.tw).

Publication History

  1. Issue published online: 8 JUL 2009
  2. Article first published online: 22 JUN 2009
  3. Received 4 November 2008; accepted 22 February 09

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Keywords:

  • damping ratio;
  • dynamic finite element;
  • premolar;
  • stress

Abstract

Aim  To evaluate the ex vivo effects of damping on stress concentration in root filled premolar teeth.

Methodology  Damping ratios of maxillary premolar teeth that had undergone root canal treatment were tested in a laboratory model. In addition, two-dimensional finite element (FE) models were established for dynamic analysis.

Results  The mean-damping ratio was significantly lower in premolar teeth that had undergone root canal preparation (8.50 ± 0.53%) than in unprepared teeth (14.42 ± 2.17%) (P < 0.05). However, root filling had a significant positive effect on the damping ratio of the tooth (10.84 ± 1.70%) (P < 0.05). When the damping ratio was taken into consideration, FE analysis revealed that peak stresses in the apical one-third of the root on the buccal side were reduced by 31.8% when mastication forces were applied on the palatal cusp and occlusal fossa.

Conclusion  Pulp tissue plays an important role in providing protective effects when teeth are subjected to a dynamic load. However, root filled teeth do not provide such protective effects.

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