Background: The coronal seal is a crucial factor in success of any pulp therapy. When endodontic therapy is being carried out in multiple visits, there is a need to seal the access cavity by interim restorative materials that prevents the leakage of oral fluids and bacterial invasion into the access cavity and thus obviating reinfection. Hence the aim of the present study was to assess the sealing ability by evaluating microleakage of three different types of interim restorative materials. Method: A total of 45 extracted human premolars were divided randomly in to 3 groups. Group-1: Cavit G (3M), group-2: IRM (Dentsply Sirona), group-3: Temp.it (Spident co. ltd). Standardized access cavity preparation was done followed by placement of cotton pellet in the access cavity, interim restorative materials were placed as per the assigned group of restorative materials. Teeth were stained with 10% methylene blue dye for 1 week after which all the teeth were analysed for dye penetration under stereomicroscope. Statistical analysis of data was done using one-way ANOVA and Post Hoc Tukey test with a significance level of P ≤ 0.05. Results: Temp.it showed the least micro leakage value (5.28mm). Intergroup comparison showed statistically significant difference between Tempt.it and other groups whereas IRM and Cavit G showed no statistical significance. Conclusion: Though none of the tested materials were completely able to prevent the micro leakage, newer light cure interim restorative material Tempt.it provided better marginal seal than the other commercially available hand mixed and ready to use interim restorative materials.
Keywords: Interim restorative material, bacterial microleakage, marginal seal, coronal barriers