Coronal Microleakage of Temporary Filling Materials of Endodontically Treated Teeth.

Introduction: Temporary filling materials are commonly used to seal endodontic access cavities between visits. Objectives: The purpose of this study was to evaluate coronal microleakage of four temporary filling materials.  Methods: Four Temporary filling materials were evaluated; two ready made (Cavisol, Litrak) and two hand mixed (Zinc Phosphate, reinforced zinc oxide-eugenol{IRM}). Total samples were 80 intact extracted human permanent premolars. On each sample standardized class I access cavity (4x4 mm) was prepared. Samples were divided evenly into four groups. Each group was restored with one of the tested materials. The marginal seal of four filling materials was examined after thermocycling   (5 to 55 0C for 500cycles) using methylene blue dye penetration methods. Grading of the microleakage pattern was from 1 to 3, with 3 providing the best seal. Results: The result indicated that microleakage along Cavisol and Litrak samples was within grade 3; whereas IRM and zinc phosphate samples absorbed the dye into the bulk of the materials. Litrak was found to exhibit the best seal amongst the four tested materials followed by Cavisol, Zinc phosphate and IRM. Conclusion:  ready made temporary filling materials has the best sealing ability over hand mixed temporary filling materials.