QUANTITATIVE MICROLEAKAGE EVALUATION OF DIFFERENT FIBER POSTS CEMENTED WITH DIFFERENT ADHESIVE CEMENTS

Purpose: the aim of this in vitro study was to compare the microleakage of two fiber-reinforced post systems cemented with luting agents that utilize two currently available adhesive approaches in three segments of teeth. materials and methods: forty two extracted human maxillary central incisor and canine teeth with straight root canals were prepared using a step-back technique and obturated with gutta-percha using lateral condensation. following standardized post-space preparations, the roots were divided into 2 fiber-post groups (carbopost, relyx fiber post) and further divided into 3 subgroups of 7 specimens each for the adhesive approach (panavia f, relyx unicem, maxcem). all specimens were thermal cycled 2500 times between 5°c and 55°c and stored in methylene-blue solution for 24 hours. bonded specimens were cut horizontally into three sections (cervical, medium, apical) and each section was evaluated using a stereomicroscope at original magnification x12. for each image, dye penetration was estimated as the ratio of methylene-blue-infiltrated surface divided by total dentin surface. the data were statistically analyzed by using the kruskal-wallis test and mann-whithney u test (p<0.05). results: carbon fiber-reinforced posts demonstrated significantly higher microleakage in cervical root sections (p<0.05) than the glass fiber-reinforced posts. for the glass fiber-reinforced post groups, the least microleakage was observed for the panavia f 2.0 in all root sections, while the highest microleakage was observed for the maxcem (p<0.05). regardless of the post types, panavia f 2.0 demonstrated the highest sealing ability, while maxcem exhibited higher microleakage in all root sections (p<0.05). conclusion: in all root section glass fiber-reinforced posts cemented with panavia f 2.0 had the least microleakage when assessed using a dye penetration technique.