@Article{, title={A comparative lateral cephalometric study between class III malocclusion and class I normal occlusion}, author={Shahba'a A. Mohammed}, journal={Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد}, volume={21}, number={4}, pages={97-103}, year={2009}, abstract={ABSTRACT
Background: The purpose of this retrospective study was to compare the craniofacial cephalometric measurements
between Class III malocclusion and Class I normal occlusion in Iraqi adults.
Materials and methods: 30 digital true lateral cephalometric radiographs for 15 males and 15 females were selected
from the files of the patients attending the Orthodontic clinic in the College of Dentistry, University of Baghdad with
an edge to edge and anterior cross bite incisor relation to represent the Class III. Another 30 digital true lateral
cephalometric radiographs for 15 males and 15 females for under and postgraduate students in the same college,
with Class I molar relation, ANB angle ranged between 2-4°, and overjet and overbite between 1-4 mm, were
selected to represent Class I normal occlusion sample. 24 skeletal and dental measurements (14 angular and 9 linear
measurements and one ratio) were measured using AutoCAD program. Independent samples t-test was used to
evaluate the classes differences in each gender.
Results and Conclusions: In comparison with Class I normal occlusion, Class III sample had: shorter posterior cranial
base length and smaller saddle angle for both genders, retrognathic maxilla in males and normal in females, shorter
maxillary length, prognathic mandible and chin position, longer mandibular length in females and normal in males,
smaller ramus height in males, steeper mandibular plane with more obtuse gonial angle, decreased posterior facial
height, normal total anterior facial height in males and decreased in females, proclined maxillary incisors as well as
retroclined mandibular incisors with larger inter-incisal angle.
Key words: Class III, cephalometrics. (J Bagh Coll Dentistry 2009; 21(4): 97-103).

} }