Effects of Horizontal Misfit and Bar Framework Material on the Stress Distribution of an Overdenture-Retaining Bar System: A 3D Finite Element Analysis

Abstract

The levels of static stresses seem to be closely linked with horizontal misfit, such that its amplification caused increased levels of stress in the structures of the overdenture-retaining bar system. On the other hand, the stiffness of the bar framework presented a lower effect on the static stress levels.

Stress analysis of different configurations of 3 implants to support a fixed prosthesis in an edentulous jaw

“…Use of FE analysis helps to overcome some traditional experimental methodological limitations, by offering information about the biomechanics of a given situation. [13][14][15][16] However, FE analysis presents some limitations due to simplifications made in the analysis. The assumption of homogeneous, isotropic, and linearly elastic properties for the bone is common in the literature, [13][14][15][16] but could affect the reliability of the results.…”

“…The elastic properties used (Table 1) were taken from the literature. [13][14][15][16] Convergence tests, with 6% confidence levels, were performed to guarantee that the results were not influenced by the FE mesh. The implant thread was removed to reduce the number of elements.…”

A Retrospective 2‐Year Clinical Study of Immediate Prosthetic Rehabilitation of Edentulous Jaws with Four Implants and Prefabricated Bars

“…Different prosthetic designs as well as multiple types of materials have been used to fabricate prosthetic frameworks . A truly passive fit of screw‐retained prostheses onto both vertical and tilted implants has been reported to be mandatory to avoid tensile, compressive, and bending forces, which may be dangerous for the osseointegration process and/or result in failure of the components . However, some studies have found that dental implants tolerate certain levels of misfit …”

Technique of Framework Cemented on Prepared Abutments to Obtain Passive Fit at Fixed Complete Denture: A 2-Year Follow-Up Report

“…The absence of a passive fit in the implant-prostheses interface increases stress concentration on the supporting tissues, due to the intimate bone-implant contact (1)(2)(3)(4). A misfit in the denture frameworks can cause many complications, including biological effects such as inflammation of the surrounding tissue, pain, bone deformation and remodeling, continual resorption or even the loss of osseointegration (5).…”