Journal of Contemporary Dentistry

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VOLUME 1 , ISSUE 2 ( October-December, 2011 ) > List of Articles

RESEARCH ARTICLE

Evaluation of the stress distribution and displacement of the denture base in edentulous mandible with varied implant positions

Meghna K. Dang, Sabita M. Ram

Citation Information : Dang MK, Ram SM. Evaluation of the stress distribution and displacement of the denture base in edentulous mandible with varied implant positions. J Contemp Dent 2011; 1 (2):14-20.

DOI: 10.5005/jcd-1-2-14

License: CC BY-ND 3.0

Published Online: 01-12-2011

Copyright Statement:  Copyright © 2011; The Author(s).


Abstract

Aim

To evaluate the stress distribution and displacement of the denture base in a three dimensional finite element edentulous mandibular model with varied implant positions.

Objectives

1)To evaluate the stresses induced by implants placed in the anterior region of the edentulous mandible. 2)To evaluate the stresses induced by implants placed in the anterior and posterior region of the edentulous mandible. 3)To compare the stresses induced by implants placed in the anterior and posterior region of the edentulous mandible. 4)To evaluate the displacement of the denture base with implants placed in the anterior and posterior region of the edentulous mandible.5)To compare the displacement of the denture base with implants placed in the anterior and posterior region of the edentulous mandible.

Materials and Methods

The materials used were Nobel Biocare Mk III long implants 3.75×13mm and short 5.0×7.0 implants, with O-ball head attachment. ANSYS: Version 8.0 software was used to create a threedimensional model of an edentulous mandible and the two implants. Three models were prepared having different implant positions and locations. MODEL 1 Two long implants were placed interforaminally in lateral incisor region one on either side, MODEL 2 Four long implants placed were interforaminally in the central incisor and canine region two on either side and, MODEL 3 Two long implants were placed interforaminally in lateral incisor region one on either side and two short implants were placed in premolar region 3mm posterior to the mental foramen, one on either side. Two types of load were given ie. vertical load of 325N was applied in second premolar and first molar region and 10N load at 150 angulation was applied in the anterior incisors area. The models were loaded separately and stress pattern, amount of stresses and amount of displacement were analysed for each model.

Results

The observations obtained from the ANSYS software were analysed and evaluated. Model 3 showed the least amount of stress and displacement as compared to the other models.

Conclusion

When the implants were spread across the arch both anteriorly and posteriorly, the stress induced in the bone and displacement of the denture base was seen to be less.


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  1. Two dental implants designed for immediate loading: a finit element analysis. Int J Oral Maxillofac Implants. 2002;17:353-362.
  2. 3D finite element analysisof overdenture stability and stress distribution on mandibular implant-retained overdenture. J Korean Acad Prosthodont 2007;45(5):633-643.
  3. Dental implant prosthetics. Treatment options for mandibular implant overdentures. 2nd edition Elsevier publishing; 2005.
  4. FEM analysis on deformation and stress distribution in fixed metal-reinforcedprovisional restorations of immediately loade XiVE implants in the edentulous mandible. Poster presented at 12th International Friadent Symposium 2006 held on march 24-26 at Salzburg, Autria.
  5. Evaluation of design parameters of osseointegrated dental implants using finite element analysis. J Oral Rehab 2002;29:565-574.
  6. Attachments of implant retained tissue supported denture under biting forces. Archive Computational Mat Sc Surface Eng 2009;1(1):13-20.
  7. The influence of various attachment types in mandibular implant retained overdentures on maximum bite force and EMG. J Dent Res 2002;81(3):170-173.
  8. A threedimensional finite element study on two versus four implants in an edentulous mandible. Int J Prosthodont 1994;7(3):271-279.
  9. Mandibular implant overdentures supported by two or four endosseous implants. A 5 year prospective study. Clin Oral Impl Res. 2005:16;19-25.
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