J Korean Acad Prosthodont.  2012 Apr;50(2):119-127. 10.4047/jkap.2012.50.2.119.

Finite element analysis on the connection types of abutment and fixture

• Jung BH
• Lee GJ
• Kang DW

• KMID: 2195505
• DOI: http://doi.org/10.4047/jkap.2012.50.2.119

Abstract

PURPOSE
This study was performed to compare the stress distribution pattern of abutment-fixture connection area using 3-dimensional finite element model analysis when 5 different implant systems which have internal connection.
MATERIALS AND METHODS
For the analysis, a finite element model of implant was designed to locate at first molar area. Stress distribution was observed when vertical load of 200 N was applied at several points on the occlusal surfaces of the implants, including center, points 1.5 mm, 3.0 mm away from center and oblique load of 200 N was applied 30degrees inclined to the implant axis. The finite element model was analyzed by using of 3G. Author (PlassoTech, California, USA).
RESULTS
The DAS tech implant (internal step with no taper) showed more favorable stress distribution than other internally connected implants. AS compare to the situations when the loading was applied within the boundary of implants and an oblique loading was applied, it showed higher equivalent stress and equivalent elastic strain when the loading was applied beyond the boundary of implants. Regardless of loading condition, the abutments showed higher equivalent stress and equivalent elastic strain than the fixtures.
CONCLUSION
When the occlusal contact is afforded, the distribution of stress varies depending on the design of connection area and the location of loading. More favorable stress distribution is expected when the contact load was applied within the diameter of fixtures and the DAS tech implant (internal step with no tapering) has more benefits than the other design of internally connected implants.

Keyword

Dental Implants; 3 Dimensional Finite Element Analysis; Occlusal Force; Internal Connection Implant; Implant-Abutment Connection

MeSH Terms

4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid
Axis, Cervical Vertebra
Bite Force
California
Dental Implants
Finite Element Analysis
Molar
Sprains and Strains
4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid
Dental Implants

Figure

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  Fig. 1 Abutment and fixture modeling. DSA: JOY (DAS tech, Gwangju, Korea), AST: Osseospeed TX (Astra tech, Mölndal, Sweden), FRI: Ankylos C/X (Friadent, Mannheim, Germany), SST: Standard Implant (Straumann, Waldenburg, Switzerland), SBL: Bone Level Implant (Straumann, Waldenburg, Switzerland).

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  Fig. 2 Finite element model of whole body.

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  Fig. 3 Loading conditions. A: Loading A condition, B: Loading B condition, C: Loading C condition, D: Loading D condition.

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  Fig. 4 The stress contours of models under Loading A condition.

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  Fig. 5 The stress contours of models under Loading B condition.

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  Fig. 6 The stress contours of models under Loading C condition.

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  Fig. 7 The stress contours of models under Loading D condition.

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