Editorial Type:
Article Category: Research Article
 | 
Online Publication Date: 01 Feb 2016

Stress Distribution on Short Implants at Maxillary Posterior Alveolar Bone Model With Different Bone-to-Implant Contact Ratio: Finite Element Analysis

DDS, PhD,
DDS, PhD,
DDS, PhD,
DDS, PhD, and
DDS, PhD
Page Range: 26 – 33
DOI: 10.1563/aaid-doi-D-14-00003
Save
Download PDF

The aim of this study was to evaluate the stress distribution of the short dental implants and bone-to-implant contact ratios in the posterior maxilla using 3-dimensional (3D) finite element models. Two different 3D maxillary posterior bone segments were modeled. Group 1 was composed of a bone segment consisting of cortical bone and type IV cancellous bone with 100% bone-to-implant contact. Group 2 was composed of a bone segment consisting of cortical bone and type IV cancellous bone including spherical bone design and homogenous tubular hollow spaced structures with 30% spherical porosities and 70% bone-to-implant contact ratio. Four-millimeter-diameter and 5-mm-height dental implants were assumed to be osseointegrated and placed at the center of the segments. Lateral occlusal bite force (300 N) was applied at a 25° inclination to the implants long axis. The maximum von Mises stresses in cortical and cancellous bones and implant-abutment complex were calculated. The von Mises stress values on the implants and the cancellous bone around the implants of the 70% bone-to-implant contact group were almost 3 times higher compared with the values of the 100% bone-to-implant contact group. For clinical reality, use of the 70% model for finite element analysis simulation of the posterior maxilla region better represents real alveolar bone and the increased stress and strain distributions evaluated on the cortical and cancellous bone around the dental implants.

<bold>
  F
  <sc>igure 1</sc>
</bold>
F igure 1

(a) The dimensions of the simulated alveolar bone segments. (b) An oblique occlusal bite force of 300 N applied at a 25° inclination to the bucco-palatinal axis of the implants.


<bold>
  F
  <sc>igure 2</sc>
</bold>
F igure 2

The von Mises stress distributions computed for the Bicon Max 2.5 short dental implants evaluated under oblique load.


<bold>
  F
  <sc>igure 3</sc>
</bold>
F igure 3

The von Mises stress distributions on the implants, cortical bone, and cancellous bone for groups 1 and 2.


<bold>
  F
  <sc>igure 4</sc>
</bold>
F igure 4

(a) The maximum principal stress distributions on cortical bone group 1. (b) The maximum principal stress distributions on cancellous bone group 1. (c) The maximum principal stress distributions on cortical bone group 2. (d) The maximum principal stress distributions on cancellous bone group 2.


<bold>
  F
  <sc>igure 5</sc>
</bold>
F igure 5

(a) The minimum principal stress distributions on cortical bone group 1. (b) The minimum principal stress distributions on cancellous bone group 1. (c) The minimum principal stress distributions on cortical bone group 2. (d) The minimum principal stress distributions on cancellous bone group 2.


<bold>
  F
  <sc>igure 6</sc>
</bold>
F igure 6

The von Mises stress, maximum principal, and minimum principal stress values on cancellous bone for groups 1 and 2.


Contributor Notes

Corresponding author, e-mail: yenero80@yahoo.com
  • Download PDF