Maxillofacial features related to mandibular asymmetries in skeletal Class III patients

Publication date: Available online 3 December 2016
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Guilherme Thiesen, Bruno Frazão Gribel, Ki Beom Kim, Maria Perpétua Mota Freitas
PurposeTo analyze the components related to the different degrees of mandibular asymmetry in adults with skeletal Class III using cone-beam computed tomography (CBCT) images.Patients and MethodsCBCT images from 138 patients were analyzed. Asymmetry was determined by the deviation of the gnathion point in relation to the midsagittal plane and classified as relative symmetry, moderate mandibular asymmetry, or severe mandibular asymmetry. Several maxillary and mandibular measurements were made that compared the different degrees of mandibular asymmetry and also the difference between the measurements of contralateral side and the deviated side.ResultsFor patients with moderate and severe mandibular asymmetry, there were statistically significant differences between bilateral measurements of the sagittal position of the heads of the condyle, transversal and sagittal positioning of the gonion, ramus height and mandibular body length, as well as in the transversal and vertical positioning of the jugale point, besides a vertical positioning of the gonion only for severe asymmetry. In patients with severe mandibular asymmetry, there was a highly significant correlation of the gnathion lateral displacement with the lower dental midline displacement, as well as with the difference in the height of the mandibular rami between the deviated and contralateral sides.ConclusionIn subjects with skeletal Class III, not only the lateral displacement of the menton but also a series of morphological changes differed significantly for each degree of mandibular asymmetry.



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