Análise pelo método de elementos finitos da distribuição de tensões em pilares de próteses removíveis classe I de Kennedy associada a implante osseointegrado

Abstract

Purpose: Removable Partial Dentures (RPD) still are prosthetic solution for several patients, especially for the preservation of tooth structure, reversibility and low cost. However, mandibular Kennedy Class I patients have worse prognosis of this apparatus.Thus, this study aimed to compare qualitatively through the experimental two-dimensional Finite Element Analysis (FEA), the stress distribution in the abutment tooth of conventional Free End Removable Partial Dentures (FERPD) and those associated with different types of dental implants with metallic crown. Materials and Methods: For this analysis, four hemi mandibles models with 1stand 2nd pre molar were obtained: Model A, control with conventional FERPD; Model B with RPD associated with external hexagonal implant; Model C with RPD associated with Morse taper implant; and Model D with RPD associated with short implant. With the aid of the Finite Element program Marc Mentat, the models were loaded with vertical forces of 10N on each cusp tip, totalizing 60N per model. Results: Model A exhibited the worst stress distribution on the abutment teeth. A reduction of stress on abutment teeth was observed in all models with RPD associated with implants, independently of the implant type. Conclusion: The distal placement of an implant to modify the patient s arch classification has been an alternative to improve the internal pattern of stress, in order to reduce the short comings of this type of prosthesis. Thus, this treatment indication could reduce costs for patients.