The stress evaluation of root posts using the finite element analysis

ABSTRACT

INTRODUCTION AND OBJECTIVE: The aim of this investigation was to evaluate through Finite Element Analysis (FEA) the displacement and stress distribution of prefabricated serrated and tapered dental root posts of different compositions carbon fiber, glass fiber and titanium. MATERIALS AND METHODS: Through this biomechanical analysis a carbon fiber post (CF), a glass fiber post (GF) and a titanium post (TI) were compared according to their design (tapered [T]) and serrated [S]) and under a load of 250 N, at 45º, in order to simulate an occlusal load of a canine tooth. RESULTS: FEA demonstrated the following maximum displacement (MXD) in millimeters T.CF (tapered carbon fiber post) = 2.48 mm; T.GF = 1.58 mm; T.TI = 0.50 mm; S.CF = 7.66 mm; S.GF = 4.87mm. CONCLUSION: These results showed that the carbon fiber post demonstrated the greatest displacement, followed by the glass fiber and the titanium posts. The tapered design presented detachment values much lower than the serrated design.