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RGO - Revista Gaúcha de Odontologia

On-line version ISSN 1981-8637


LORENZI, Lígia Maria et al. Wylie-Johnson analysis of adolescents of Afro-Brazilian descent with normal occlusion: investigation of the mean values. RGO, Rev. Gaúch. Odontol. [online]. 2014, vol.62, n.1, pp.13-17. ISSN 1981-8637.


The purpose of this study was to evaluate mean cephalometric measurements for a group of individuals of Afro-Brazilian descent using the Wylie-Johnson analysis, and to investigate the presence of sexual dimorphism.


Thirty-six lateral radiographs of the head of African-Brazilians were used. Subjects were 10 to 14 years old and had clinically normal occlusion, all permanent teeth, and no history of orthodontic treatment.


Results for girls and boys were, respectively: SNA 88.31º and 89.68º; SNB 83.96º and 85.01º; ANB 4.44º and 4.69º; 1:1= 118.18º and 116.51º; FG-ST 16.47 mm and 16.12 mm; ST-Pmf 19.69 mm and 19.88 mm; Pmf-ANS 53.69 mm and 54.84 mm; Pmf-1ºMS 21.83 mm and 20.64 mm; FG-Pg 108.19 mm and 108.45 mm; FPL -MPL 27.48º and 27.65º; TAFH 111.06 mm and 112.26 mm; UAFH 45.26 mm and 45.38 mm; LAFH 65.80 mm and 66.88 mm; FG-FPL 1.069 mm and -2.086 mm; MBL 70.24 mm and 69.67 mm; MRH 51.89 mm and 53.70 mm; gonial angle 129.27º and 129.28º. Results of Student's-t test (α=5%) did not show any sexual dimorphism. Results of descriptive statistics were similar for the individuals of Afro-Brazilian descent in the study.


Individuals of African descent had bimaxillary protrusion, a more acute interincisal angle, a larger inferior facial height, and a markedly convex profile.

Keywords : African Continental Ancestry Group; Cephalometry; Orthodontics.

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