AIM: To compare, cephalometrically and morphometrically, the craniofacial growth characteristics between untreated subjects with a Class II division 1 malocclusion and subjects with a Class I occlusion from the pre- to the post-pubertal stages of development, as defi ned on the basis of a biological indicator of individual skeletal maturity (cervical vertebral maturation method). SUBJECTS AND METHOD: The Class II division 1 sample comprised 17 subjects (11 males, 6 females) and the Class I group 17 subjects (13 males, 4 females). The lateral cephalograms of the subjects in both groups were analyzed at six consecutive stages of skeletal maturation [cervical stage (CS) 1 to CS6]. Three craniofacial regions (cranial base, maxilla and mandible) were analyzed on the lateral cephalograms of the subjects in both groups by means of thin-plate spline analysis at CS1 (pre-pubertal) and CS6 (post-pubertal). Both cross-sectional and longitudinal comparisons were performed on growth changes and on the size and shape differences between the two study groups. RESULTS: Craniofacial growth in subjects with an untreated Class II malocclusion was essentially similar to that observed in untreated subjects with a Class I occlusion at all developmental intervals, with the exception of signifi cantly smaller increases in mandibular length (P < 0.001) at the growth spurt (CS3 through CS4) and during the overall observation period (CS1 to CS6). Morphometric analysis showed an increased cranial base angulation as a typical feature of Class II malocclusions at the pre-pubertal developmental phase. Maxillary changes in shape or size were not signifi cantly different between the two groups. Subjects with a Class II malocclusion exhibited a signifi cant defi ciency in the size of the mandible at the completion of active craniofacial growth as compared with Class I subjects. CONCLUSIONS: Class II dentoskeletal disharmony does not exhibit a tendency to self-correction with growth.
|Titolo:||Size and shape growth changes in untreated subjects with Class II malocclusions.|
|Anno di registrazione:||2007|
|Autori di Ateneo:|
|Autori:||F. Stahl; L. Franchi|
|Appare nelle tipologie:||1c - Abstract su rivista|