12-31-2016, 09:49 PM
Sources: Facial growth in males 16 to 20 years of age R. J. Love, J. M. Murray, and A. H. Mamandras; Longitudinal changes in the adult facial profile Walter A. Formby, DDS, MS," Ram S. Nanda, DDS, MS, PhD, b and G. Friins Currier, DDS, MSD, MEd
Quote:Postpubertal craniofacial skeletal and dental changes were examined from lateral cephalograms taken when subjects were 16, 18, and 20 years of age. The sample consisted of males with no previous orthodontic treatment who had Class I skeletal and dental characteristics.
The rate of change of mandibular measurements was significant at each age interval. However, a much greater rate of change was seen from 16 to 18 years than from 18 to 20 years. Growth rates for this study did not agree with some previous studies.
Mandibular growth was greater than maxillary growth at each age interval when measured by either of two methods. A larger differential was seen from 16 to 18 years than from 18 to 20 years. Despite the fact that the magnitude of maxillary and mandibular growth after the age of 16 years did not approach previously reported pubertal levels, growth of both jaws was significant and may need to be assessed in orthodontic treatment planning.
The mandibular plane angle was significantly reduced, indicating a upward and forward rotational growth pattern. Forward rotation was thought to be brought about by disproportionate anteroposterior vertical growth.
Quote:Longitudinal growth changes in the adult craniofacial complex were studied for 24 white male and 23 white female subjects between the ages of 18 and 42 years who had Class I or end-to-end molar relationships and no excessive protrusions or retrusions.
The male profile straightened with age, and both lips became more retrusive. The males increased in all nose dimensions and in soft tissue thickness at pogonion, but decreased in upper lip thickness at labrale superius with a slight decrease in lower lip thickness at labrale inferius.
For males most changes in hard tissue measurements had been accomplished by age 25 years, whereas soft tissue changes in the nose, lips, and chin occurred as much after age 25 years as from age 18 to 25 years.
Those males who had high relative sagittal mandibular growth also experienced larger sagittal maxillary growth, and those who showed greater skeletal growth also had more soft tissue growth at the nose.