RESUMO
Eighty-two-day-old male Wistar rats were selected to study the pattern of craniofacial growth following partial or total resection of zygomatic arches. Rats were divided into five groups: Group I or control group; group II, with unilateral partial resection of zygomatic arch; group III, with bilateral partial resection; group IV, with unilateral total resection, and group V, with bilateral total resection of zygomatic arch. Direct dry skull and cephalometric measurements showed increased facial projection and decreased transverse facial width on side of resected arch. Different considered points, measured distances, and average results obtained are presented. Conclusions of this study are discussed emphasizing the function of zygomatic arch as moderator of morphologic development and growth of the face. Practical application of this study if results are extrapolated to growth pattern of patients with malformations of zygomatic arch, such as Treacher Collins syndrome, are discussed also, establishing as priority in their treatment the reconstruction of this structure.
Assuntos
Zigoma/cirurgia , Animais , Animais Recém-Nascidos , Masculino , Ratos , Ratos Wistar , Zigoma/crescimento & desenvolvimentoRESUMO
Con el objeto de estudiar el patrón de crecimiento craneofacial ante la ausencia del arco cigomático por su resección en etapa temprana, se estudiaron 82 ratas Wistar divididas en tres grupos: grupo I, testigo; Grupo II, animales con resección bilateral. Los producto fueron sacrificados a los cuatro meses de edad para su estudio cefalométrico y de cráneo seco. Se presentan los resultados y se discuten las posibles causas de las alteraciones de crecimiento observadas que, extrapoladas al patrón de crecimiento del síndrome de Treacher Collins, permiten concluir que el arco cigomático tiene un efecto moderador en el desarrollo morfológico de la cara