Analysis of in vitro flexural strength and stress distribution of four different glass fibre posts with finite element method

Stress concentrations and values of four different glass fibre posts-FibreKleer (Jeneric Pentron, USA), everStick (StickTech, Finland), FRC Posteclus (Ivoclar Vivadent, Liechtenstein), Snowlight (Carbotech, USA) and a titanium post (Svenska Dentorama, Sweden) on the coronal-radicular area of maxillary central incisor tooth that develop under 100 Newton horizontal, vertical and chewing forces were analyzed using three dimension finite element method. and flexural strengths of glass fibre posts both dry and thermocycled were determined with three point bend test in vitro with a universal test machine and results were compared statisticallyMaxillary central incisor tooth with oblique and horizontal crack formation was modelled leaving 4 mm of gutta-percha and restored with a dual activated resin composite (Filtek Supreme XT, 3M ESPE, USA) core and crown material. 1.5 mm diameter FibreKleer, everStick, FRC PostecPlus, Dentorama post and two diameters (1.4-1.6 mm) Snowlight post were used for stress analysisStress values from highest till lowest were determined at FibreKleer, everStick, FRC PostecPlus, Snowlight and Dentorama posts. Stress concentrations under horizontal and chewing forces are seen mostly at Dentorama post. Under vertical forces, stress concentrations are seen similar at all posts. Stress values and concentrations are found higher at oblique cracked tooth models. Diameter differences ofSnowlight posts were found to have little impact on stress concentrations and values. Glass fibre reinforced composite posts that have highest flexural strength values both dry and thermocycled were recorded in order; everStick, FibreKleer, FRC PostecPlus andSnowlightKeywords: Glass fibre reinforced composite post, finite elements method, three point bend test