J Korean Acad Prosthodont.  2010 Oct;48(4):266-272. 10.4047/jkap.2010.48.4.266.

The effect of implant system with reverse beveled platform design on marginal bone stress distribution

Affiliations
  • 1Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea. khjo@knu.ac.kr

Abstract

PURPOSE
The purpose of this study was to investigate the effects of the surface morphology of the implant neck on marginal bone stress measured by using finite element analysis in six implant models.
MATERIALS AND METHODS
The submerged type rescue implant system (Dentis co., Daegu, Korea) was selected as an experimental model. The implants were divided into six groups whose implant necks were differently designed in terms of height (h, 0.4 and 1.0 mm) and width (platform width, w = 3.34 + 2b [b, 0.2, 0.3 and 0.4 mm]). Finite element models of implant/bone complex were created using an axisymmetric scheme. A load of 100 N was applied to the central node on the top of crown in parallel with the implant axis. The maximum compression stress was calculated and compared.
RESULTS
Stress concentration commonly observed around dental implants did not occur in the marginal bone around all six test implant models. Marginal bone stress varied according to the implant neck bevel which had different width and height. The stress was affected more markedly by the difference in height than in width.
CONCLUSION
This result indicates that the implant neck bevel may play an important role in improving stress distribution in the marginal bone area.

Keyword

Implant neck; Reverse bevel; Finite element analysis; Marginal bone stress distribution

MeSH Terms

Axis, Cervical Vertebra
Crowns
Dental Implants
Finite Element Analysis
Models, Theoretical
Neck
Dental Implants

Figure

  • Fig. 1. Submerged type implant fixture with reverse slope at the crestal module. (A) overall aspect with dimensions and (B) model classification.

  • Fig. 2. Schematic figure of implant/bone complex used in this study together with important dimensions.

  • Fig. 3. Typical finite element mesh - detailed mesh profile on the marginal bone shown in the box.

  • Fig. 4. Stress distributions (maximum compressive stress) in the marginal bone around the six test implant models subject to a vertical load of 100 N. A: D55-b2-h4, B: D55-b3-h4, C: D55-b4-h4, E: D55-b2-h10, F: D55-b3-h10, G: D55-b4-h10 models.

  • Fig. 5. Stress distribution on the external surface of marginal bone around the six test implant models.


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