PHYSICAL AND MECHANICAL PROPERTIES AND FAILURE MODE COMPARISON OF HUMAN AND BOVINE ENAMEL
DOI:
https://doi.org/10.15332/us.v13i1.1394Keywords:
Orthodontics, dental enamel, tooth, orthodontic bracketsAbstract
Objective: to compare the bond strength and failure mode between human and bovine enamel using the universal testing device and stereomicroscopy.
Methods: sixty teeth were used, thirty human upper premolars and thirty lower bovine incisor which were cemented with metallic standard brackets (Ortho Organizers, California, EE. UU.) using composite resin (Transbond® XT, 3M Unitek, St. Paul, Minnesota, EE. UU.) for later testing adhesion using the universal testing device (Instron 3367 Class 0.5 with load cell 0-30Kn, EE. UU.) at a speed of 1.,5 mm/min. The data was calculated in megapascals, dividing the force by the area of the bracket base. Finally, in order to determine the failure mode, the tooth surfaces and the bases of the brackets, were analyzed by visual inspection using a stereomicroscope (Stemi 2000C, Carl Zeiss, Göttingen, Germany).
Results: the bond strength in bovine teeth was higher than in human teeth (12.11 MPa and 6.10 MPa, respectively) without a statistically significant difference (p=0.052). The predominant failure modes for human and bovine teeth were presented at the interface Resin/Bracket (RB 60.71%) and Adhesive/Enamel (AE 57.14%). Multiple correspondence analyses reported that any force value could have any failure mode in both types of teeth.
Conclusion: although no statistically significant difference between groups was found, the applied method cannot determine whether it is possible the use of bovine teeth as a substitute for human teeth enamel in adhesion studies.
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