Buccal and palatal cusps fracture resistance of root filled teeth using various dentine bonding agents and hybrid composite resin

In this study, we aimed to compare the buccal and palatal cusp fracture resistance of endodontically treated primary maxillary premolars with mesial-occlusal-distal cavity which was restored with composite resin by using different types of bonding adhesives. A hundred extracted double rooted human maxillary premolars were randomly separated into five groups in which 20 teeth were included in each group. Group 1 was restorated with total performance hybrid spectrum hybrid composite and Prime&Bond NT, and Group 2 was restorated with total performance hybrid spectrum hybrid composite and Clearfil S-Tri Bond. Group 3 was restorated with total performance hybrid spectrum hybrid composite and Clearfil SE Bond. Group 4 was considered as positive control, and Group 5 was considered as negative control. Also each experimental group was divided into two subgroups of 10 teeth in order to compare the values of buccal and palatal cusp fracture resistance. Group 3, in which Clearfil SE Bond was used showed a higher value of fracture resistance than Group 1, in which Prime&Bond NT was used. When samples were investigated, it was observed that there was no statistically significant difference between buccal and palatal cusps of mesial-occlusal-distal cavities which were restorated with hybrid composite and different bonding adhesives.