J Korean Acad Prosthodont.  2001 Apr;39(2):125-145.

A Comparison Of Load Transfer In Screw-And Cement-Retained Implant Fixed Partial Denture Designs

• Lee JH
• Kim CW
• Kim YS

Abstract

To compare the stress distribution patterns between cement-retained and screw-retained implant supported fixed prostheses according to four different abutment types, a three dimensional finite element analysis was performed. The hypothetical three unit fixed partial denture case was modeled on the three implants (10mm length and 3.75 diameter) in mandibular bone. Four angles of implantation (vertical 10,15 and 20 degree inclined mesially) were created and three different directions of force (vertical, oblique, horizontal) were applied at the center of the second premolar and distal end of the first molar for each cases. Within the limits of this study, the results were as follows. 1. In vertically installed cases, the more stress was concentrated at upper components, but mesially inclined cases, the more stress was concentrated at cortical bone. 2. The more inclined mesially the more stress was observed, especially at cortical bone. 3. The cement-retained models showed lower principal stress and more even stress distribution than the screw-retained models. 4. The similar stress distribution pattern was showed in model 1 and model 2, model 3 and model 4. 5. The more stress was observed when the loads were applied at the distal end of 1st molar than the center of 2nd premolar. 6. The fixture and the model as a whole, lesser stress values were observed when vertical loads were applied as compared to horizontal and oblique loads.

MeSH Terms

Bicuspid
Denture, Partial, Fixed*
Finite Element Analysis
Molar
Prostheses and Implants