A longitudinal study of normal asymmetric mandibular growth and its relationship to skeletal maturation
ABSTRACT Our aims in this investigation were to assess asymmetric mandibular growth relative to skeletal maturation and to determine whether asymmetric growth occurs during a period of high growth velocity.
We evaluated lateral oblique and hand-wrist radiographs of 30 male and 30 female Class I participants in the Burlington Growth Study who were assessed at 3 time periods with the skeletal maturation index (SMI). The body, the ramus, the effective length, and the gonial angle on each side of the mandible were measured. Asymmetry between the right and left sides was analyzed with the SMI and for sex dependency.
The left ramus was consistently longer than the right in all evaluation periods (P <.05). The right body was consistently longer than the left in all evaluation periods (P <.05). The effective length showed no asymmetry until the last maturation group, when the right side was longer (P <.05). The gonial angle had no significant differences. Tests to determine differences between the sexes showed no significance in asymmetry, but the body, the ramus, and the effective length were longer in males than in females (P <.05).
Asymmetry does not occur or increase during any specific growth period.
- SourceAvailable from: Lesbia Rosa Tirado Amador05/2015; 11(20). DOI:10.16925/od.v11i20.748
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ABSTRACT: The aim of the present study was to determine the prevalence of mandibular asymmetries during the mixed dentition in growing children. For this purpose, a retrospective study was designed where various measurements were performed on the right and left sides of the mandible of panoramic radiographs of 327 children (males: 169; females: 158), 8-12 years old. Four linear measurements, mandibular ramus height, ramus width, corpus height, and corpus length, and two angles, mandibular gonial (Go) and mandibular condyle (Co), and the developmental stage of the permanent lower second molar were analysed. All measurements were adjusted for the magnification factor. The final data were then processed for the asymmetry index (AI) to determine the severity of the asymmetries and statistically analysed by Wilcoxon paired tests at the 95 per cent level of confidence. A moderate-to-severe mandibular asymmetry for the linear dimensions when both sides of the mandible were contrasted was found in more than a half of the sample. There was also a high prevalence of moderate and severe asymmetries when comparing Go and Co angles on both sides of the mandible. No differences were observed in the developmental stage of the lower permanent second molar between either side. There was a high prevalence of both dimensional and angular mandibular asymmetries in the studied population.The European Journal of Orthodontics 06/2011; 33(3):236-42. DOI:10.1093/ejo/cjq057 · 1.39 Impact Factor
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ABSTRACT: INTRODUÇÃO: as assimetrias faciais representam um desequilíbrio entre as estruturas esqueléticas homólogas da face. A maioria das pessoas apresenta algum grau de assimetria facial, pois é rara a condição de perfeita simetria. Todavia, somente quando é perceptível aos olhos do paciente, essa assimetria passa a ser relevante. Em tal condição, a correção ortocirúrgica ou o tratamento ortodôntico são possibilidades normalmente adotadas. OBJETIVO: o presente trabalho, baseado em uma revisão de literatura, é ilustrado por um caso clínico cujo tratamento consistiu em cirurgia ortognática Le Fort I para avanço e rotação da maxila e, na mandíbula, o tratamento foi conservador. CONCLUSÃO: o conhecimento da queixa principal e da expectativa do paciente e exames de diagnóstico bem realizados são itens importantes na decisão do plano de tratamento e no sucesso do resultado final.12/2011; 16(6):100-110. DOI:10.1590/S2176-94512011000600016