Objective: The aim of this study was to analyze the influence of cavity preparation and indirect restorative materials on the stress distribution over posterior teeth employing the Finite Elements Analysis. Methods: A buccal-lingual mandible section performed exactly over the mesio-lingual cusps of the first mandibular molar was computer designed, representing the enamel, dentin, periodontal ligament, spongy bone and cortical bone. The cavity preparation was defined as conservative (1) or extensive (2) as it follows: GII: inlay (1); GIII: inlay (2); GIV: onlay (1); GV: onlay (2); GVI: overlay(1); GVII: overlay (2). The elasticity modulus and Poisson Coefficient were defined to each structure, and to the resinous cement, ceramic material (Empress) and ceromer (Targis). An occlusal load was performed on maximum intercuspation and on lateroprotrusion (work side). The stress distribution was analyzed by a computer software, Ansys 6.1. Results: It was verified on the maximum intercuspation a higher tension concentration on functional cusps. On lateroprotrusion this situation was greater on the groups with an extensive occlusal opening. The Von Mises stress concept proved that the restorative material type may influenciate the stress distribution. Conclusions: Ceramics tends to accumulate the stress inside the restoration body whereas ceromer tends to transfer it to the tooth structure. Support by: FAPEMIG/CNPq.

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