Journal article
Different skeletal types underlying Class III malocclusion in a random population.
- Staudt CB Division of Orthodontics, Section of Dental Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland. christine.staudt@unige.ch
- Kiliaridis S
- 2009-11-07
Published in:
- American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. - 2009
Adolescent
Cephalometry
European Continental Ancestry Group
Facial Bones
Humans
Jaw Relation Record
Male
Malocclusion, Angle Class III
Maxillofacial Development
Skull
Young Adult
English
INTRODUCTION
We aimed to investigate the skeletal morphology underlying Class III malocclusion in a random population of young white men.
METHODS
We randomly selected 3358 Swiss Army recruits and examined them clinically. Of 77 (2.3%) with Class III malocclusion, 57 agreed to have lateral cephalograms. Mandibular and maxillary relationships (ANB, Wits), positions (SNB, SNA), and relative sizes (GoPg and ANS-PNS related to SN) were determined. Comparison with normal values showed discrepancies.
RESULTS
In 75.4% of the subjects, the Class III malocclusion had a skeletal origin. The discrepancy was mainly (47.4%) due to mandibular prognathism or growth excess (10.5% prognathism, 15.8% macrognathia, or 21.1% both), whereas the maxilla alone accounted for 19.3% (10.5% retrognathism, 8.8% micrognathia), and there was a combination of mandibular and maxillary disharmony in 8.7%. Dental compensation was common, with proclined maxillary incisors in 42.1% and retroclined mandibular incisors in 26.3%.
CONCLUSIONS
About 75% of the Class III malocclusion had skeletal origin in our subjects, mainly due to mandibular prognathism or macrognathia. The different skeletal types proposed in our study can give guidance in treatment planning and the evaluation of treatment effects in Class III malocclusion and in genetic studies.
We aimed to investigate the skeletal morphology underlying Class III malocclusion in a random population of young white men.
METHODS
We randomly selected 3358 Swiss Army recruits and examined them clinically. Of 77 (2.3%) with Class III malocclusion, 57 agreed to have lateral cephalograms. Mandibular and maxillary relationships (ANB, Wits), positions (SNB, SNA), and relative sizes (GoPg and ANS-PNS related to SN) were determined. Comparison with normal values showed discrepancies.
RESULTS
In 75.4% of the subjects, the Class III malocclusion had a skeletal origin. The discrepancy was mainly (47.4%) due to mandibular prognathism or growth excess (10.5% prognathism, 15.8% macrognathia, or 21.1% both), whereas the maxilla alone accounted for 19.3% (10.5% retrognathism, 8.8% micrognathia), and there was a combination of mandibular and maxillary disharmony in 8.7%. Dental compensation was common, with proclined maxillary incisors in 42.1% and retroclined mandibular incisors in 26.3%.
CONCLUSIONS
About 75% of the Class III malocclusion had skeletal origin in our subjects, mainly due to mandibular prognathism or macrognathia. The different skeletal types proposed in our study can give guidance in treatment planning and the evaluation of treatment effects in Class III malocclusion and in genetic studies.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.1016/j.ajodo.2007.10.061
- PMID 19892290
- Persistent URL
- https://folia.unifr.ch/global/documents/245723
Statistics
Document views: 46
File downloads: