Journal List > J Korean Acad Prosthodont > v.48(4) > 1034634

Cha, Cho, and Jo: The effect of implant system with reverse beveled platform design on marginal bone stress distribution

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. (J Korean Acad Prosthodont 2010;48:266-72)

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Fig. 1.
Submerged type implant fixture with reverse slope at the crestal module. (A) overall aspect with dimensions and (B) model classification.
jkap-48-266f1.tif
Fig. 2.
Schematic figure of implant/bone complex used in this study together with important dimensions.
jkap-48-266f2.tif
Fig. 3.
Typical finite element mesh - detailed mesh profile on the marginal bone shown in the box.
jkap-48-266f3.tif
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.
jkap-48-266f4.tif
Fig. 5.
Stress distribution on the external surface of marginal bone around the six test implant models.
jkap-48-266f5.tif
Table 1.
Material properties
Material Young’ Modulus (GPa) Poisson ratio Strength (MPa) Tensile yield stress (MPa)
Titanium 102.2 0.35 - -
Cortical bone 13.7 0.3 72 - 76 (tensile) 60
      140 - 170 (compressive)  
Cancellous bone 1.37 0.3 22 - 28 (tensile) -
Gold (type IV) 95 0.3   -
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