Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study

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The best line of treatment to restore root canal treated teeth is one of the highly considered and debatable subjects. The breakthrough of adhesion in dentistry has enhanced the techniques of restoration of endodontically treated teeth. Adhesive composite resin and glass fiber posts have superseded the previously used non-bonded amalgam and metallic posts. Preservation of the remaining tooth structure without the need to create retentive means in the preparation is considered a great advantage, moreover, these tooth-colored materials support the esthetic demands. The coverage of cusps of endodontically treated posterior teeth should not be undervalued to avoid the high risk of fracture. Porcelain fused to metal crowns were commonly used to restore posterior teeth with the underlying metal substructure for the strength and overlying porcelain for the appearance. However, this type of restorations necessitated considerable amount of reduction and had limited esthetics. In a move towards ... Objectives Course Objective The flat occlusal preparation design (FOD) of posterior teeth offers promising results of fracture resistance and stress distribution, but its application in vital teeth is limited as there may be a danger of pulp injury. Although this danger is omitted in endodontically treated teeth, there is no research work assessing the impact of FOD on the fracture resistance and distribution of stresses among these teeth. The aim of this study was to assess the impact of FOD of endodontically treated molars on the fracture resistance and distribution of stresses among a ceramic crown-molar structure when compared to the two planes occlusal preparation design (TOD)