Avaliação ultra-sonográfica do crescimento facial pré-natal

• Ano de defesa: 2008
• Autor(a) principal: Cardon, Stefan
• Orientador(a): Marchioro, Ernani Menezes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre
• Palavras-chave em Português: ODONTOLOGIA; ORTODONTIA; ORTOPEDIA FACIAL; ULTRASONOGRAFIA PRÉ-NATAL; DIAGNÓSTICO PRÉ-NATAL; DESENVOLVIMENTO FETAL; DESENVOLVIMENTO MAXILOFACIAL; FACE - CRESCIMENTO E DESENVOLVIMENTO
• Link de acesso: http://hdl.handle.net/10923/360

This study has the objective of evaluate the measurements of fetal cephalometrics, in the midsagittal plan, from images generated by ultra sonograms, in order to allow a better understanding of the mechanism of prenatal growth. The transversal sample consisted of 120 ultrasonographic images from healthy embryos of caucasian ancestry, in single gestation, between the 17ª and 35ª weeks. Angular measurements had been carried through that evaluated five variables: the maxillary position in relation to the anterior cranial base (SNMx), the mandibular position in relation to the anterior cranial base (SNMd), the intermaxillary distance difference to intermaxillary referring to Nasion (MxNMd), the mandible growth direction – Y-axis angle (NSGn) and the tegumental facial profile convexity (G'SnPog'). The averages and shunting line-standard for each variable were described and statistical tests were applied, that evaluated the compatibility of the obtained measures as well as the correlations between these and the gestational ages. The data had been analyzed with statistical software SPSS 15,0 (Chicago, IL, the USA) and Excel for Windows 2007 (Microsoft Corp., Redmond, WA, the USA). The results had indicated that three, of the five studied variables, had presented statistical significant correlations with the advance of the gestational age. From the results, it was concluded that, during the observed fetal period, the mandible grew, on average, more than what the maxilla, having as reference the anterior cranial base. There was a reduction of the intermaxilar sagittal difference and the convexity of the tegumental facial profile. The measurements related to the maxillary position and the Y-axis angle of mandibular growth had not presented correlations with the gestational age.