J Korean Acad Prosthodont.  2010 Jul;48(3):181-188. 10.4047/jkap.2010.48.3.181.

A 3-dimensional finite element analysis of tapered internal connection implant system (Avana SS III(R)) on different abutment connections

• Lee HS
• Kim MR
• Park JM
• Kim SJ

• KMID: 2195553
• DOI: http://doi.org/10.4047/jkap.2010.48.3.181

Abstract

PURPOSE
The purpose of this study was to compare the stress distribution characteristics of four different abutment connections on SS-III(R) fixture under occlusal loading, using 3-dimensional finite element method.
MATERIALS AND METHODS
The fixture of SS-III(R) (Osstem, Korea) with 4 mm diameter and 11.5 mm length and 4 types of abutments were analyzed; Solid, Com-Octa, ComOcta Gold, and Octa abutment. The models were placed in the area of first molar in the mandible. The 4 loading conditions were; (1) the vertical loading of 100 N on the central fossa, (2) the vertical loading of 100 N on the buccal cusp, (3) the 30degreesinclined loading of 100 N to lingual side on the central fossa, and (4) the 30degrees inclined loading of 100 N to the lingual side on the buccal cusp. The 3G.Author program was used, the von-Mises stress was calculated and the stress contours were plotted on each part of the implant systems and the surrounding bone structures.
RESULTS
Regardless of abutment types and loading conditions, higher stress concentration was observed at the cortical bone. In cancellous bone, the highest stress was observed at apical portion and the maximum stress occurred at the implant neck. The higher internal stress was observed in the fixtures than in the bone. The lowest stress was observed at loading condition 1 and the stress concentration was also lower than any other loading conditions.
CONCLUSION
Within the limitation of the result of this study, it seems that the abutment connection type does not affect much on the stress distribution of bone structure.

Keyword

Three-dimensional FEA; SS-III(R) implant; Implant abutment; Stress distribution

MeSH Terms

Finite Element Analysis
Mandible
Molar
Neck

Figure

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  Fig. 1. Boundary conditions and materials of Model 1 (A: Solid abutment), Model 2 (B: ComOcta abutment), Model 3 (C: ComOcta Gold abutment) and Model 4 (D: Octa abutment).

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  Fig. 2. Locations and directions of loadings.

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  Fig. 3. Stress concentration in superstructure (Model 1).

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  Fig. 4. Maximum von-Mises stress in crown.

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  Fig. 5. Stress concentration in abutment screws (Load 3).

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  Fig. 6. Maximum von-Mises stress in abutment screw.

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  Fig. 7. Stress distribution in fixture.

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  Fig. 8. Maximum von-Mises stress in fixture.

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  Fig. 9. Stress distributions in bone.

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  Fig. 10. Stress distribution in cortical bone under loading conditions (Model 4).

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  Fig. 11. Maximum von-Mises stress in bone.

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