Medical Engineering & Physics
Volume 28, Issue 3 , Pages 199-213, April 2006

Effects of different inter-implant distances on the stress distribution around endosseous implants in posterior mandible: A 3D finite element analysis

  • Barış Şimşek

      Affiliations

    • Gazi University, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Guvenevler Gelincik Sokak No:14/2, Kavaklidere, 06690 Ankara, Turkey
    • Corresponding Author InformationCorresponding author. Tel.: +90 532 423 4127; fax: +90 312 212 5817/223 9226.
    • ,
  • Erkan Erkmen

      Affiliations

    • Gazi University, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Guvenevler Gelincik Sokak No:14/2, Kavaklidere, 06690 Ankara, Turkey
    • ,
  • Derviş Yilmaz

      Affiliations

    • Gazi University, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Guvenevler Gelincik Sokak No:14/2, Kavaklidere, 06690 Ankara, Turkey
    • ,
  • Atılım Eser

      Affiliations

    • Middle East Technical University, Department of Mechanical Engineering, Ankara, Turkey

Received 10 August 2004; received in revised form 10 April 2005; accepted 12 April 2005. published online 27 June 2005.

Abstract 

Purpose

The aim of this study was to evaluate the effects of different inter-implant distances on stress distribution in the bone around the endosseous titanium implants under vertical, oblique and horizontal loads in the posterior mandibular edentulousim by finite element analysis (3D FEA).

Materials and methods

3D FEA models representing mandible and ITI® implant (Straumann, Waldenburg, Switzerland) were simulated. The distances in-between the units were set at 0.5, 1.0 and 2.0cm. Vertical (V) 70°N, 60° oblique (BL) 35°N in buccolingual direction and horizontal (MD) 14°N in mesiodistal direction loads were applied to each of these designs. The principal stresses (tensile and compressive stress) on each model were calculated using MSC MARC finite element analyze solver software.

Results

The tensile stress (Pmax) values have been evaluated that they rose at the cervical region of buccal side when the inter-implant distances increased under V and BL loads and they diminished while the inter-implant distances decreased. In short inter-implant distances the compressive stress (Pmin) has been presented with increased values and found at the lingual surface of the cervical region.

Discussion

The results of this study indicated that the magnitude of the stress was influenced by complex factors such as the direction of loads and the distance between adjacent fixtures. The stress occurring around fixtures differs significantly with various types of inter-implant distance.

Conclusion

The evaluation of tensile and compressive stresses for cortical and cancellous bone under V, MD and BL loading conditions in aspect of inter-implant distance shows; the 1.0cm of inter-implant distance is the optimum distance for two fixture implantation.

Keywords: Inter-implant distance, Dental implant, Peri-implant structure, Stress distribution, 3D finite elements analysis

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PII: S1350-4533(05)00095-0

doi:10.1016/j.medengphy.2005.04.025

Medical Engineering & Physics
Volume 28, Issue 3 , Pages 199-213, April 2006

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