A comparison of stress distribution and flexion among various designs of bar attachments for implant overdentures: A three dimensional finite element analysis

Vijay, Prakash and D’Souza, Mariette and Adhikari, Raviraj (2009) A comparison of stress distribution and flexion among various designs of bar attachments for implant overdentures: A three dimensional finite element analysis. Indian Journal of Dental Research, 20 (1). pp. 31-36. ISSN 0970-9290

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Abstract

Context: Bar overdentures are popular choices among clinicians worldwide but configurations that provide an optimal biomechanical distribution of stress are still debatable. Aims: To compare the stresses and elastic flexion between implant supported bar over dentures in various onfigurations using finite element analysis. Settings and Design: A CAT scan of a human mandible was used to generate an anatomicallyaccurate mechanical model. Materials and Methods: Three models with bars and clips in three different configurations were constructed. Model 1 had a single bar connecting two implants, Model 2 had three bars connecting all the four implants, and Model 3 had two bars connecting the medial and distal implants on the sides only. The models were loaded under static conditions with 100N load distributed at the approximate position of the clip. The mandibular boundary conditions were modeled considering the real geometry of its muscle supporting system. Maximum von Mises stress at the level of the bar and at the bone implant interface were compared in all three models. The flexion of mandible and the bar was also compared qualitatively. Statistical Analysis Used: The analyses were accomplished using the ANSYS software program and were processed by a personal computer. Stress on these models was analyzed after loading conditions. Results: Qualitative comparisons showed that stress at the level of the bar and at the bone implant interface were in the following order: Model 1> Model 3> Model 2. The flexion of the mandible and the bar were in the following order: Model 2 > Model 1 > Model 3. Conclusions: Four implant bar systems connected by bars on the sides only is a better choice than two implant bar systems and four implant bar systems with bars connecting all four implants

Item Type: Article
Uncontrolled Keywords: Bar attachment, finite element analysis, implant overdenture, stress distribution
Subjects: Dentistry > MCODS Manipal > Prosthodontics
Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 31 Mar 2016 14:23
Last Modified: 31 Mar 2016 14:23
URI: http://eprints.manipal.edu/id/eprint/145718

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