Longitudinal study of the relationship between mandibular growth and height growth in subjects with skeletal Class II

Guilherme THIESEN, Marcus Vinicius Neiva Nunes do REGO, Eduardo Martinelli Santayana de LIMA

The height growth of children and teenagers, as well as its relationship with the rate of craniofacial growth, are of large interest to the orthodontist, since the indication of a therapy to control jaw development is based on the study of the skeletal age of the patient and subsequent somatic maturation. Therefore, this study aimed at evaluating the correlation between height growth and mandibular growth of 30 subjects presenting with skeletal Class II, with no orthodontic treatment, which were longitudinally followed-up through the Burlington Growth Study of Canada. The serial records were obtained at 6, 9, 12, 14 and 16 years of chronological age and comprised lateral cephalograms, clinical records and personal information. The results indicated that the height growth spurt, as well as the largest mean increase in the mandibular measurements, occurred from 9 to 12 years of age for the females and from 12 to 14 years of age for the males. Moreover, it was also observed that, among all study measurements, the rate of increase of the mandibular length demonstrated the strongest correlation with the mean rate of height growth of these individuals, specially for the males during their growth spurt (r=0,758).

Keywords: Class II. Mandibular growth. Height growth. Facial growth spurt.

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