Dental Materials
Volume 23, Issue 3 , Pages 317-324, March 2007

Prediction of permanent deformation in cast clasps for denture prostheses using a validated nonlinear finite element model

  • Ahmad Abdel Aziz Mahmoud

      Affiliations

    • Department of Conservative Dentistry and Prosthodontics, Dental School, University of Jordan, Amman 11942, Jordan
    • Corresponding Author InformationCorresponding author. Tel.: +962 79 6490 483; fax: +962 6 5339 289.
    • ,
  • Noriyuki Wakabayashi

      Affiliations

    • Removable Prosthodontics, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo 113-8549, Japan
    • ,
  • Hidekazu Takahashi

      Affiliations

    • Advanced Biomaterials, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo 113-8549, Japan

Received 29 March 2005; received in revised form 10 October 2005; accepted 25 October 2005.

Abstract 

Objectives

Permanent deformation is one of the most common mechanical complications that affect denture clasps. This can lead to loss of retention and stability of the prosthesis. The purpose of this study was to apply and validate a nonlinear finite element model for permanent deformation prediction in cast denture clasps. Such a model can enhance the process of design optimization and contribute to minimizing the possibility of this problem.

Methods

Cast clasps made from Ti–6Al–7Nb, Co–Cr and Type IV gold alloys were loaded in three different directions (outside, inside and outside inclined 30°), and the resulting permanent deformation values were recorded. Nonlinear finite element analysis simulations based on the maximum distortion energy criterion for yielding, were conducted for clasp models that were reproduced according to the dimensions of each experimental specimen. Linear regression analysis for the results of the experiment and simulation was performed to verify the validity of the mathematical models.

Results

Deflections required to produce specific amounts of permanent deformation were in close agreement with those recorded experimentally. The R2 value for all bending tests was 0.985 and the linear regression equation expressed in micrometers was [DeflectionFEA=0.976 (DeflectionReal)+34].

Significance

Permanent deformation behavior in the cast clasps with a relatively wide range of deflections (0–2mm) can be predicted using the proposed model, which shall enhance the design optimization process of cast clasps for denture prostheses.

Keywords: Finite element analysis, Nonlinear analysis, Plastic deformation, Denture, Clasp

To access this article, please choose from the options below

Login to an existing account or Register a new account.

  • Purchase this article for 31.50 USD (You must login/register to purchase this article)

    Online access for 24 hours. The PDF version can be downloaded as your permanent record.

  • Subscribe to this title

    Get unlimited online access to this article and all other articles in this title 24/7 for one year.

  • Claim access now

    For current subscribers with Society Membership or Account Number.

  • Visit SciVerse ScienceDirect to see if you have access via your institution.
 

PII: S0109-5641(06)00041-8

doi:10.1016/j.dental.2005.10.012

Dental Materials
Volume 23, Issue 3 , Pages 317-324, March 2007

Article Tools

* Image Usage & Resolution