Apical microleakage of different luting agents in endodontically treated teeth restored with para-post system

Endodontically treated teeth are known to present a higher risk of biomechanical failure than vital teeth. Complete obturation of the root canal system to the cementodentinal junction is assumed to be an important goal in endodontic treatment. The microleakage is determined today by many in vivo and in vitro techniques such as; staining, measurement by scanning electron microscope, bacterial activity, decay, air pressure, chemical agents, markers, neutron activation analysis, radioisotope, ionisation, autoradiography, and reversible radioactive adsorption and thermal cyclus application. The purpose of this study was to compare the apical leakage with using the biomolecular characteristics of the methylene blue technique in root canals obturated with a stainless-steel post system (ParaPost System) cemented with zinc-policarboxilate cement, glass-ionomer cement and resin cement. Fifty mandibular first premolar teeth with straight root canals, anatomically similar root segments (root lengths 17 mm.), and fully developed apices, extracted for periodontal reasons, were selected and divided into 5 groups of 10 each. Analysis of variance (ANOVA) was used to determine whether significiant differences existed between the means of the different groups. Multiple comparisons and rankings were done using Duncan's multiple range test. The negative controls and positive controls all leaked significantly more than all of the experimental groups. Glass ionomer cement had significantly less microleakage than zinc-policarboxilate cement. Composite resin (self-cured) cement had significant more microleakage than all of the cements at (p<0.001).