Three-dimensional finite element analysis on stress distribution of the mandibular implant-supported cantilever prostheses depending on the designs.
10.4047/jkap.2009.47.1.70
- Author:
Jae Hyurk BAN
1
;
Sang Wan SHIN
;
Sun Jong KIM
;
Jeong Yeol LEE
Author Information
1. Department of Advanced Prosthodontics, Graduate School of Clinical Dentistry, Korea University, Korea. swshin@korea.ac.kr
- Publication Type:Original Article
- Keywords:
Three-dimensional FEA;
Rest implant;
All-on-Four;
Stress distribution
- MeSH:
Bite Force;
Bone Resorption;
Complement System Proteins;
Finite Element Analysis;
Imidazoles;
Mandible;
Molar;
Nitro Compounds;
Prostheses and Implants
- From:The Journal of Korean Academy of Prosthodontics
2009;47(1):70-81
- CountryRepublic of Korea
- Language:Korean
-
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.
