J Korean Acad Prosthodont.  2009 Jan;47(1):70-81. 10.4047/jkap.2009.47.1.70.

Three-dimensional finite element analysis on stress distribution of the mandibular implant-supported cantilever prostheses depending on the designs

• Ban JH
• Shin SW
• Kim SJ
• Lee JY

• KMID: 2000388
• DOI: http://doi.org/10.4047/jkap.2009.47.1.70

Abstract

STATEMENT OF PROBLEM: The position and length of cantilever influence on the stress distribution of implants, superstructure and bone. In edentulous mandible, implant-supported cantilever prostheses that based 4 or 6 implants between mental foramens has been attempted. Excessive bite force loaded at cantilever prosthesis causes bone resorption and breakage of superstructure prosthesis around posterior implants. To complement the cantilever length of conventional prosthesis, In 1992, (McCartney) introduced "cantilever - rest - implant" and Malo reported "All-on-Four" in 2003. PURPOSE: Analyze and compare the stress distribution of conventional cantilever prostheses with rest implant and Allon-Four(TM) implant prostheses. MATERIAL AND METHOD: The external loads (300 N vertically, 75 N horizontally) are applied to first molar area. The stress value, stress distribution and aspect of stress dispersion are analyzed by three-dimensional finite element analysis program, ANSYS ver. 10.0.
RESULTS
1. The rest implant and "All-on-Four" implant system are superior to conventional cantilever prostheses to reduce stress on the bone and the superstructure around implants. 2. The rest implant was of the greatest advantage to stress distribution on bone, implant and superstructure. 3. With same number of implants, distally tilted implants are preferred to conventional cantilever prostheses for reducing the length of cantilever.

Keyword

Three-dimensional FEA; Rest implant; All-on-Four; Stress distribution

MeSH Terms

Bite Force
Bone Resorption
Complement System Proteins
Finite Element Analysis
Imidazoles
Mandible
Molar
Nitro Compounds
Prostheses and Implants
Complement System Proteins
Imidazoles
Nitro Compounds

Figure

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  Fig. 1. Geometric configurations of mandible section and implants.

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  Fig. 2. Finite element models of three types of used.

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  Fig. 3. Finite element models of mandible, implant and prosthesis.

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  Fig. 4. External loads subjected to prosthesis on right mandible.

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  Fig. 5. Maximum equivalent stress of cortical bone. (Model A: conventional type, Model B: rest implant type, Model C: Allon-Four type)

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  Fig. 6. Maximum equivalent stress of cortical bone. (Model A: conventional type, Model B: rest implant type, Model C: All-on-Four type)

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  Fig. 7. Maximum equivalent stress of cancellous bone. (Model A: conventional type, Model B: rest implant type, Model C: Allon-Four type)

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  Fig. 8. Maximum equivalent stress of cancellous bone. (Model A: conventional type, Model B: rest implant type, Model C: All-on-Four type)

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  Fig. 9. Maximum equivalent stress of implants. (Model A: conventional type, Model B: rest implant type, Model C: Allon-Four type)

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  Fig. 10. Maximum equivalent stress of implants. (Model A: conventional type, Model B: rest implant type, Model C: All-on-Four type)

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  Fig. 11. Maximum equivalent stress of prosthesis. (Model A: conventional type, Model B: rest implant type, Model C: Allon-Four type)

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  Fig. 12. Maximum equivalent stress of prosthesis. (Model A: conventional type, Model B: rest implant type, Model C: All-on-Four type)

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