A in vitro study of coronal microleakage of different post and cement systems / 实用口腔医学杂志

ABSTRACT

Objective: To compare the coronal sealing abilities of different post and cement systems through measuring the value of leakage by using dye method. Methods: Fifty human mandibular premolars with single canal were divided into 6 groups randomly. A group roots sealed by temporary material, B group roots restored with fiber post adhered with composite resin cement, C group roots restored with casting metal post and core adhered with composite resin and zinc phosphate cement, D group positive control, E group negative control. After finishing preparation and restoration of roots, microleakage was determined by using dye method. Results: The groups restored with any post and core system produced significantly less microleakage than temporary material sealing group(P<0.05). But no differences were detected between two groups bonded with the composite resin cement (P>0.05). Posts adhered with zinc phosphate luting agent produced more leakage than those with composite resin cement(P<0.05). Conclusion: Luting agent can decrease the coronal microleakage. Composite resin cement provides better sealing ability.