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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo cefalométrico-radiográfico individualizado do posicionamento da maxila em indivíduos com oclusão normal / Individual radiographic-cephalometric study of the position of the maxilla in normal occlusion subjects

Silva, Fernando Penteado Lopes da 10 March 2006 (has links)
Made available in DSpace on 2016-08-03T16:31:10Z (GMT). No. of bitstreams: 1 CAPA.pdf: 7954 bytes, checksum: a945699e853811fd047284c2598975bd (MD5) Previous issue date: 2006-03-10 / The position of the maxilla in the skull is subject of investigation by many authors along the time. Transmitting their ideas trough linear and angular measurements, they defined what considered as ideal , normal or acceptable position of the maxilla, relating it in most of the time with the cranial base. By the study of subjects with considered normal occlusion and with good facial balance, it was calculated mean values and standard deviations of some measurements, which were considered as parameters to evaluate all kinds of malocclusions. Considering the divergences found in the literature, the purpose of the present study was to evaluate the vertical and horizontal position of the maxilla and its inclination, in 94 subjects with normal occlusion. Considering this, it was determined some correlations between measurements of the own subjects: OPI-N with OPI-ENA and N-ENA with ENA-ENP. By the strong index of correlation found between these measurements, it was concluded that OPI-N can be take as a reference to establishment of OPI-ENA. In addition, ENA-ENP can be considered a reference to establish the distance N-ENA, so it is possible to determine respectively the position of the maxilla on the horizontal and vertical planes. The inclination of the maxilla, as defined by the angle OPI.ENA.ENP showed a mean value statistically very close of 0o (zero), indicating a strong tendency of the posterior extension of the palatal plane (ENA-ENP) touch the most posterior and inferior region of the occipital bone (OPI point). This was considered an important characteristic of subjects with normal occlusion. / O posicionamento da maxila no esqueleto craniofacial tem sido motivo de investigação por diversos autores ao longo do tempo. Traduzindo suas idéias por meio de medidas lineares ou angulares, tais autores definiram o que consideraram como a posição ideal , normal , ou aceitável da maxila, relacionando-a, na maioria das vezes, com a base do crânio. A partir da avaliação de indivíduos com oclusão considerada normal e com bom equilíbrio facial, eram calculados valores médios e desvios-padrão de determinadas medidas, os quais eram tomados como parâmetros para avaliações cefalométricas de pacientes distintos. Diante das divergências de opiniões encontradas na literatura, a proposta do presente estudo foi avaliar o posicionamento da maxila nos sentidos vertical, ântero-posterior e a sua inclinação, numa amostra de 94 indivíduos com oclusão normal. Foram determinadas correlações entre medidas do próprio indivíduo: OPI-N com OPI-ENA e N-ENA com ENA-ENP. A partir dos fortes índices de correlação encontrados, concluiu-se que a medida OPI-N pode ser tomada como referência para determinação de OPI-ENA, da mesma forma que ENA-ENP pode ser considerada para determinação de N-ENA, definindo respectivamente a posição da maxila nos sentidos sagital e vertical. A inclinação da maxila, representada aqui pelo ângulo OPI.ENA.ENP, teve valor médio estatisticamente próximo a 0o (zero), indicando forte tendência do prolongamento posterior do plano palatino (ENA-ENP) tangenciar a base posterior do crânio (ponto OPI), o que se revela uma importante característica de indivíduos com oclusão normal.

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