Objectives: Cantilever extensions increase the load distributed to supporting structures in fixed partial dentures. In this clinical scenario biomechanical complications and clinical failure are possible. The length of the cantilever considered as optimal is not well-known. The purpose of this study was to examine the stress distribution in distal cantilevered fixed prostheses that are designed with different cantilever length and different connector width between the cantilever and the primary abutment restoration. Methods: The finite element method was used to create models of 2 restoration types; porcelain fused to metal and an all-ceramic (IPS Empress 2) fixed prosthesis. Both models were designed with distal cantilevers involving the first and second premolars as abutments and cantilever extension involving a premolar or molar.. The widths of connectors between the cantilever and the primary abutment restoration were changed (from 2.25 mm to 3.25 mm) to evaluate the influence of a width change on stress distribution. The load applied during the FEA was positioned at the cusp tips of all teeth. Results: The finite element analysis of the models revealed Von Misess stress values with maximum stress concentrations observed on connectors of distal cantilevers. Stress concentration sites were also observed at the distal cervical area of the second premolar tooth. Conclusions: Increasing the length of distal cantilever increased the stress levels, while the wider connectors decreased the stress levels. The stress levels in IPS Empress 2 models were greater than ceramometal models. . There was a direct correlation between length of cantilever and stress distribution, and an inverse correlation with length of the cantilever and the width of connector.

Back to the Scientific Program Program
Back to the Joint Meeting of the Continental European, Israeli, and Scandinavian (NOF) Divisions of the IADR (August 25 -- 28, 2004)

Top Level Search