Comparison of Push-out Bond Strength of Gutta-percha to Root Canal Dentin in Single-cone and Cold Lateral Compaction Techniques with AH Plus Sealer in Mandibular Premolars

Background and aims. The singlecone technique has gained some popularity in some European countries. The aim of the present study was to compare the pushout bond strength of guttapercha to root canal dentin with the singlecone and cold lateral compaction canal obturation techniques.Materials and methods. The root canals of 58 human mandibular premolars were prepared using modified crowndown technique with ProTaper rotary files up to #F3as a master apical file (MAF) and divided randomly into groups A and B based on canal obturation technique. In group A (n = 29) the root canals were obturated with singlecone technique with #F3(30/.09) ProTaper guttapercha, which was matched with MAF in relation to diameter, taper and manufacturer in group B (n = 29) the canals were obturated with guttapercha using cold lateral compaction technique. In both groups AH plus sealer were used. After two weeks of incubation, three 2mm slices were prepared at a distance of 2 mm from the coronal surface and pushout test was carried out. Data were analyzed with descriptive statistics using independent sles ttest.Results. There were statistically significant differences between two groups. The mean pushout bond strength was higher in group B (lateral compaction technique) compared to group A (singlecone technique P < 0.05).Conclusion. Use of singlecone technique for obturation of root canals resulted in a lower bond strength compared to cold lateral compaction technique.