Levantamento estatístico do valor do módulo de elasticidade da dentina e dos materiais utilizados na reabilitação protética de raízes fragilizadas

Abstract

Endodontically treated teeth are more prone to root fracture and its rehabilitation is a complex task. The final restoration should reinforce the remaining tooth structure while allowing the maximum strength and retention of the selected post/core system. The behavior of these teeth has been reported by clinical, experimental and numerical studies, presenting a great variability of results. This study aimed to statiscally analyze the values presented in the literature for the elastic modulus of then dentin and the restorative materials used in prosthetic reconstruction of weakened roots, in order to allow for a better standardization for the numerical studies. Through a literature search Medline (PubMed) for experimental studies that investigated the elastic modulus of dentin and restorative materials, 149 studies were selected from which 78 were about dentin properties and 71 on restorative materials. The studies were categorized according to the material property and their results were analyzed and classified separately according to the type of mechanical tests performed. The statistical method of normal KolgomorovSmirnov was used for the statistical analysis. The values obtained were: 18,72GPa (dentin under compression), 18,45GPa (dentin under tension), 10,23GPa (composite resin), 4,55GPa (glass ionomer), 4,78GPa (adhesive), 42,27GPa (glass fiber post). Despite the variability, statistic results have shown a normal distribution. Therefore, the values may be assumed to well represent the materials behavior, which allows them to be used in Finite Elements Method (MEF) Studies.