Push-out bond strength of theracal lc, mta and gic used as furcal perforation repair materials and the time dependent change in it

The present study was conducted to compare and evaluate the push-out bond strength and its time-dependent change, of various materials when used for furcal perforations i.e. change in strength after 24 hours and 7 days to determine which material had the maximum push-out bond strength measurement so as to bear the forces of compaction of the coronal restoration. The study was carried out by preparing standard endodontic access cavities and decoronating 30 molars 5mm above the pulpal floor. After which, perforations were made in the furcal area of the pulpal floor. The size of the perforations was measured with a Stereomicroscope and ImageJ analysis. The remaining dentin thickness was measured with digital calipers. In each sample, a saline-soaked sponge was placed apical to the furcal perforation. For stabilisation, the roots were embedded in Silicon putty impression material to simulate the periodontal ligament, the apical third being embedded in cold-cure acrylic. The perforations were repaired with three different materials, Group I ProRoot White MTA, Group II Glass Ionomer Cement and Group III Theracal LC. Out of 10 samples, 5 samples in each group were subjected to push-out bond strength measurement after 24 hours & the remaining 5 after 7 days. Universal Instron testing machine with 1-mm-thick cylindrical stylus was used for push-out bond strength measurement at a crosshead speed of 0.5 mm/min. The results thus obtained were tabulated and were statistically analysed by using Anova and Tukey’s test. At both 24 hours and 7 days, the push-out bond strength of MTA>Theracal LC>GIC.