Microleakage of Different Post Systems and a Custom Adapted Fiber Post

Objective: the effects of closely adapting a prefabricated fiber to the post space remain unknown. the purpose of this study was to quantify the microleakages of a custom adapted fiber-reinforced post, a prefabricated quartz fiber post and a cast post using nondestructive methods.materials and methods: sixty-five extracted human premolars were endodonti-cally treated and randomly divided into three groups (n=15), which were restored using a cast post-and-core, a custom adapted fiber post (refropost) with a micro-hybrid microfiller resin composite (gradia), or a prefabricated quartz fiber post (dt light post) and two groups of control ( n=10). all groups were cemented us-ing a dual polymerizing resin cement (panavia f2.0). a composite core (z100) was used for the fiber posts. the microleakage was calculated for the experimental and control groups before and after thermal cycling and cycling loading using a radio-tracer solution (thallium 201 chloride) and a gamma counter device. data were subjected to statistical analysis of anova and tukey hsd at significant level of p< 0.05.results: significantly lower microleakage values were found for the cast post-and-core (mean value =16.04 ×104 ) and custom adapted fiber post groups (mean value=14.36×104). thermal cycling and cyclic loading had no significant effect on the microleakage value of any tested group.conclusion: post systems with improved adaptation showed similar microleakage to casting posts.