The characteristic features of skeletal class III in Iraqi adult orthodontic patient

Al-Mothaffar, Nagham; KH. Al-lehaibi, Wurood

	The characteristic features of skeletal class III in Iraqi adult orthodontic patient
Journal of baghdad college of dentistry
Article 1, Volume 23, Issue 3, 2011, Pages 149-155
Authors
Nagham Al-Mothaffar; Wurood KH. Al-lehaibi
Abstract
ABSTRACTBackground: Skeletal class III malocclusion is one of the dentofacial anomalies which associated with deviation inthe sagittal relationship of maxilla and mandible. This study performed to determine the characteristic features ofskeletal class III compared with skeletal class I.Materials and methods: Skeletal class III sample included 100 pretreatment digital lateral cephalometric radiographs(18-29) years which selected on the basis of Beta angle [> 35°] and divided into five groups according to location ofmaxilla and mandible in relation to the anterior cranial base (SNA and SNB angles). Another 45 radiographs wereselected as control group (normal SNA, SNB angles, Beta angle 27°-35°). Fourteen angular and eight linearmeasurements digitized and recorded using AutoCAD 2010 computer program.Results and Conclusions: In comparison with skeletal class I, skeletal class III had: Shorter anterior cranial base length,more obtuse gonial angle, no significant difference in the articular angle and upper anterior facial height. Labiallyproclined upper incisor and lingually retroclined lower incisor. The prognathism of both jaws was formed 43% of thesample with the most horizontal growth pattern and protruded profile, the retrognathism of both jaws formed 20%with the most vertical growth pattern and retruded profile. 17% of the sample had normal positioned maxilla andprotruded mandible and displayed horizontal growth pattern with protruded profile. Pure retruded maxilla formed12% of the sample and the least type was the combined maxillary retrognathism and mandibular prognathism (8%);both showed vertical growth pattern with protruded profile but extremely obvious in the latest one.Key words: Skeletal class III, Characteristic features. (J Bagh Coll Dentistry 2011;23(3): 149-155).

Statistics Article View: 6