title: Finite element stress analysis of tooth-to-implant fixed partial denture designs.
abstract: OBJECTIVE
  The purpose of this study was to conduct a three-dimensional finite element stress analysis to compare models representing a natural tooth and an integrated implant connected with rigid and nonrigid prostheses.
  
  
  METHODS
  The mathematical models described an integrated implant connected to a second premolar tooth with a three-unit metal-ceramic fixed partial denture. In one model, the tooth and implant were rigidly connected, and in the other, a nonrigid connection was assumed. From a simulated vertical load the computer generated resultant stress contours and values (compressive and tensile) in horizontal and vertical dimensions.
  
  
  RESULTS
  A comparison of the magnitude and pattern of stresses generated in the models shows minimal differences. Although the maximum stress values were slightly higher in some areas of the rigid prosthesis model, the differences were negligible.
  
  
  CONCLUSIONS
  Based on the similarities in both the patterns of stress contours and the stress values generated in the two models, advocating a nonrigid connection because of a biomechanical advantage may be erroneous.
authors.affiliation: Department of Prosthodontics, School of Dental Medicine, University of Pittsburgh, PA 15261.
authors.forename: C M
authors.initials: CM
authors.lastname: Misch
authors.forename: Y H
authors.initials: YH
authors.lastname: Ismail
mesh_terms: D000539:Alveolar Process / Q000503:physiopathology; D001696:Biomechanical Phenomena; D000044:Dental Abutments; D015921:Dental Implants; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000379:methods*; D003781:Denture Retention / Q000295:instrumentation*; D003830:Denture, Partial, Fixed; D006801:Humans
chemical_list: D015921:Dental Implants