The Effect of Flowable Bulk Fill Vs Multi Increment Composite on Microleakge and Polymerization Shrinkage Strain in Pulpotomized Primary Molars

Abstract

Success of restoration of pulpotomized molars is highly associated with the biological seal provided by the final restoration that prevent bacterial infiltration of the remaining vital pulp tissue. Stainless steel crowns have been the golden standard to restore pulpotomized primary molars with high success rate. However, recently parents show increasing demands to provide esthetic restorations for their children causing resin based composites more popular for the restoration of primary molars. This study was designed to assess and compare the microleakage of different restorative materials: Stainless steel crowns, multi Increment restorative composite resin, and bulk fill flowable restorative composite resin, used in restoration of pulpotomized primary molars using two different adhesive systems. Also to compare between the polymerization shrinkage strain of the two composite resins used. In the microleakage test the extracted primary second molars were cleaned with rubber cup and pumice and scaled by ultra-sonic scaler to remove any debris on their surfaces and stored in distilled water at room temperature within one month after extraction until use. All the specimens were randomly divided into 3 groups according to the material used as follows: