مقايسه آزمايشگاهي ريزنشست به داخل كانال در دو نوع ماده سازنده كور تحت استرسهاي حرارتي

Invitro evaluation of intracanal microleakage of two core buildup materials after thermocycling

Introduction: Amalgam and adhesive resin cores with prefabricated dowels are commonly used to restore endodontically treated teeth. These restorations have been widely studied for their mechanical properties; however, less is known about their sealing ability. The purpose of this study was to compare the intracanal microleakage of amalgam and adhesive resin cores (coremax). Materials and Methods: In this interventional study, 30 intact human single root premolars were randomly divided into two groups each with fifteen teeth. Class V cavities with the dimension of 4mm*5mm were prepared on the buccal surface of each tooth with gingival margin in cementum and the cavity to be passed through the canal orifice. Then one group was filled with amalgam (oralloy) and another group with Coremax 11 according to manufactureʹs. After thermocycling and dye penetration, the teeth were sectioned and microleakage was assessed under a stereomicroscope SPSS software (version II) was used for data analysis (student t-test). Results: The mean microleakage of intracanal dye penetration of Coremax II was not significantly different from amalgam although it was greater for Coremax II compared to amalgam.(P-value= 0.720) Conclusion: Amalgam cores have less microleakage than adhesive resin cores but there was no significant difference between them.