Vickers micro hardness was assessed on root dentin and cementum in 30
canines obtained from the Periodontics Discipline tooth bank. Crown and
cervical portion of the root were discarded by a transverse section
situated 3mm, apically, from the cemento-enamel junction on the buccal
surface, thus obtaining the root specimen. On root dentin, mean micro
hardness values were obtained for 3 regions: (DR1) from 0.05 to 0.1 mm
of the cemento dentin junction - 30.64 VHN; (DR2) from 0.3 to 0.5 mm of
the cemento dentin junction - 56.92 VHN and (DR3) from 0.8 to 1.0 mm of
the cemento dentin junction - 32.70 VHN. After statistical analysis
(Variance Analysis test, p > 0,05), we conclude that micro hardness
at the DR2 region was statistically greater than that at the DR3 region
which was, in turn, greater than that at the DR1 region. The mean micro
hardness of cementum was 19.70 VHN
