Analise da estabilidade do reposicionamento inferior da maxila sem a utilização de enxerto interposicional : um estudo cefalometrico retrospectivo / Analysis of stability after maxillary inferior repositioning without interpositional graft : a retrospective cephalometric study

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The true vertical maxillary deficiency is a characteristic of Short Face Syndrome (CFS), in these patients, the inferior repositioning of the maxilla is indicated in order to provide a better facial esthetics and improved function. But this surgical movement has been described as the most instable movement, and interpositional autogenous bone graft usually is used to increase post-surgical stability. The objective from this study was to evaluate long term post surgical stability of the inferior repositioning of the maxilla, fixed with four 2.0mm "L" shaped miniplate, positioned at canine and zygomatic-maxillary buttresses, without any type of graft. A cephalometric study was performed, analyzing linear measures the I, A, ANS, CMV and PNS points until horizontal reference line (S-N drawing 7° inferiorly) and vertical reference line (perpendicular the S-N 7° crossing S point) traced at 3 different times: immediate pre operative, immediate post operative and a long time post operative with least 6 months. A total sample of 10 young adult patients who underwent an inferior repositioning of the maxilla was achieved. As result of this study, it was found an average surgical movement of 5.13 mm at I point, 5.82mm at SNA point and 5.34mm at A point. A relapse of 2.36 mm (43.39%), 2.87 mm (48.44%) and2.80 mm (51.41%) was found respectively. A strong statistical positive correlation was found between the amount of movement and amount of relapse for all points analyzed with a Pearson coefficient r>0.5000. It was concluded, in this sample, that the inferior repositioning of the maxilla using this type of internal rigid fixation without any type of graft is not stable and that one strong positive correlation exist enters the amount of inferior movement and amount relapse

ASSUNTO(S)

recurrence sindromes recidiva osteotomy osteotomia syndrome

ACESSO AO ARTIGO

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