RESUMO
<p><b>OBJECTIVE</b>To explore the change of bone density of children's mandible measured by quantitative computed tomography (QCT).</p><p><b>METHODS</b>71 children aged between 10-16 years were measured by QCT in left mandible angle, middle of mandible and right mandible angle. The differences were analyzed according to the age and sex respectively.</p><p><b>RESULTS</b>The density of mandible of left mandible angle, middle of mandible, right mandible angle were 44.29, 89.70, 54.31 mg/dL in the 10-12 ages group, and 63.85, 122.47, 70.23 mg/dL in the 13-16 ages group.</p><p><b>CONCLUSION</b>Male youngster's mandible density was increased with the age between 10-12 and 13-16 ages. There were significant differences between left mandible angle, middle of mandible and right mandible angle. There were significant differences of mandible density between male and female.</p>
