Reinforcement of Resin Composites for Core Build-up by Glass Fiber Post

Abstract

The aim of this study was to investigate the reinforcement effect of the position and diameter of a glass fiber post on the strength of resin composites in core build-up by insertion of a glass fiber post. Three different cured-type resin composites for core build-up and three different diameters of two different brands of glass fiber post were tested. Rectangular specimens, in which either the post was placed into the upper side (compressive side) or the lower side (tensile side), were fabricated and subjected to the 3-point bending test. In addition, the fracture resistance of the resin composite core with fiber post placed in human extracted premolar was determined. Significantly greater flexural strength was observed in the specimens in which the post was placed in the lower side than in those with it placed in the upper side (p<0.05). A trend was seen that the larger the diameter of the post, the greater the flexural strength in the 3-point bending test and the fracture resistance of the resin composite core in extracted teeth.