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Dental Press Journal of Orthodontics

Print version ISSN 2176-9451


TUMA, Carlos Eduardo da Silva Nossa et al. Evaluation of the bone age in 9-12 years old children in Manaus-AM city. Dental Press J. Orthod. [online]. 2011, vol.16, n.3, pp.63-69. ISSN 2176-9451.

OBJECTIVE: This study evaluated the bone age using the Greulich & Pyle method (1959) and pubertal growth according to the study conducted by Martins (1979). METHODS: Hand and wrist radiographs of 201 children (103 boys) aged 9 to 12 years living in Amazonas were analyzed. A chi-square test was used for statistical analysis at a level of significance of 5% (p<0.05). RESULTS AND CONCLUSIONS: Girls were at more advanced stages in all phases of skeletal growth than boys for the ages under study; 50% of the girls had reached pubertal growth peak, whereas only 11.6% of the boys were in the same stage. The beginning and the peak of the pubertal growth spurt occurred earlier among girls (10.1 ± 0.7 and 11.1 ± 0.8 years) than among boys (11.4 ± 0.7 and 12.3 ± 0.4 years). Early maturation was more frequent among girls than among boys (41.8% vs. 5.8%), and late maturation was more prevalent among boys (38.8% vs. 11.2%). Mean bone age in the group of boys was 10.4 ± 1.7 years, and in the group of girls, 11.7 ± 1.8 years.

Keywords : Growth and development; Puberty; Sexual maturation.

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