A Five-Year Evaluation of Cephalometric Measurements in Patients that Displayed over than four-ANB-Initial-Angle-Degree, treated by Means of Orthodontic Appliances and the Four First Bicuspids Extraction

Ana Carla Raphaelli NAHÁS, Marcos Roberto de FREITAS, Arnaldo PINZAN, José Fernando Castanha HENRIQUES, Guilherme dos Reis Pereira JANSON, Renato Rodrigues de ALMEIDA

The main objective of this study was to evaluate the long-term stability of the following cephalometric measurements: SNA, SNB, ANB, 1.NA, 1-NA, _1 .NB, _1 -NB, 1.PNSANS, IMPA, 1. _1 . This analysis was carried out in patients that displayed an ANB initial angle over than 4 degrees, orthodontically treated which had the four first bicuspids extracted. Alternatively, this study also determined the influence of the proposed treatment at the dentobasal arrangements by orthodontic mechanics and its preservation after five years of treatment completion. The sample of this study was comprised of twenty-seven patients that were assessed at the beginning (T1), at the end (T2) and five years later (T3). According to the statistically obtained results, all the studied measurements, between phases T1 and T2, significantly changed reflecting the influence of orthodontic mechanics on the dental movement. Between the T2 and T3 phases, all the measurements remained stable. By the end of the orthodontic treatment all the necessaries dental arrangements were performed and preserved in a long-term fashion.

Keywords: Dental arrangements. Orthodontics. Stability.

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