Comparison of resin push-out strength to root dentin of bovine- and human-teeth.

To compare the push-out strength of bovine- and human-root dentin and, thus, evaluate the suitability of bovine-root dentin to substitute human-root dentin for bond strength testing. Ten single-rooted human-teeth and ten bovine incisors were prepared using a #3 bur of a fiber post system (12 mm long). The posts were duplicated with resin cement (Duolink). The root canals were treated with All Bond 2 adhesive system and the resin posts were cemented using Duolink. The specimens were cut perpendicular to their long axis, yielding disc-specimens with 1.5 mm thickness, which were submitted to a push-out test (1 mm/min). Ten bond strength values per group (n = 10) were used for statistical analysis (Student t test, alpha =.05). Statistically significant differences were found for the bond strength values between bovine- (4.1 +/- 1.3 MPa) and human-root dentin (8.6 +/- 5.7 MPa) (P =.0001). The push-out strengths of bovine- and human-root dentin were statistically different.