Evaluation of bond strength in single‐cone fillings of canals with different cross‐sections

Aim To evaluate the effect of root canal cross‐sectional shape on single‐cone root filling bond strength, as well as to determine the percentage of gutta‐percha‐filled areas (PGFA) and sealer‐filled areas (PSFA), establishing a relationship between these variables. Methodology Distal roots of mandibular molars were selected using microcomputed tomography imaging and allocated into three groups (n = 10) according to canal shape: round, oval and long oval. The canals were prepared with an R40 reciprocating instrument and filled with matching single‐cone gutta‐percha and AH Plus sealer. Two 1‐mm‐thick dentine slices were obtained from each third of each root. PGFA and PSFA were calculated in digital images (x25 magnification) of each slice. Next, the slices were subjected to a push‐out test and the failure modes (adhesive, cohesive or mixed) were assessed. Data were analysed using parametric tests (P