Quantitative analysis of the maxilla and the mandible in hyper- and hypodivergent skeletal Class II pattern.
OBJECTIVE
To examine the volumetric (size) difference in the maxilla and the mandible of hyper- and hypodivergent skeletal patterns in Angle class II malocclusion.


METHODS
Descriptive retrospective study. The hypothesis is that a hypodivergent mandible has a larger size than a hyperdivergent mandible.


METHODS
Using cone-beam computed tomography, 20 subjects with Angle class II malocclusion were classified into two groups; 10 of 20 subjects formed a hyperdivergent group while the rest formed a hypodivergent group.


METHODS
Cone-beam computed tomography images were obtained and processed and 3D volume data was measured by one clinician. Dahlberg's technique was used to assess the measurement error and significant difference was set at p < 0.05.


RESULTS
No significant differences were found between the volumes of the maxilla and mandible in both groups. Differences were observed in the ratio of mandibular/maxillary volumes. The hypodivergent group had a significantly larger (p = 0.014) ratio than the hyperdivergent group.


CONCLUSIONS
Maxillary and mandibular volumes differ between hyper- and hypodivergent skeletal patterns.
Nair
R
R
Preventive Dentistry, National University of Singapore, Singapore.
Deguchi
T S R
TS
Li
X
X
Katashiba
S
S
Chan
Y H
YH
D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008312:Malocclusion, Angle Class II / Q000000981:diagnostic imaging / Q000473:pathology*; D008334:Mandible / Q000000981:diagnostic imaging / Q000473:pathology*; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology; D012189:Retrospective Studies; D013008:Somatotypes; D014716:Vertical Dimension; D055815:Young Adult