Estudo ortopantomográfico longitudinal das inclinações axiais mesiodistais em pacientes tratados ortodonticamente com extrações dos quatro primeiros pré-molares / Longitudinal ortopantomograph study of mesiodistal axial inclinations in orthodontically treated patients with first premolars extraction

AUTOR(ES)

Analu Giampietro Brandão

DATA DE PUBLICAÇÃO

2003

RESUMO

The objective of this study was to evaluate, through panoramic radiographs, the mesiodistal axial inclination, in orthodontically treated patients which had the four first premolars extracted, at the beginning, at the end and five years posttreatment, and to verify if the alterations in the mesiodistal axial inclination of the mandibular anterior teeth would present some influence in the relapse of their crowding. The experimental sample was comprised by 30 subjects (16 females and 14 males) with an initial mean age of 13 years and 01 month (10 years and 10 months - 18 years and 04 months), presenting either Class I or II malocclusions, treated orthodontically by standard edgewise appliance. The panoramic radiographic and dental casts of each patient were evaluated at the beginning (T1), at the end (T2) and five years posttreatment (T3). The mandibular anterior crowding was measured by Little irregularity index. The statistical analysis in which the data were processed included one-way analysis of variance (ANOVA) in order to identify the changes between the three phases related. As an adjunctive method, the Tukey test was conducted to indicate in which phases of the proposed study the statistically significant changes were occurred. The mean values of the mesiodistal axial inclination at T1, T2 and T3 were compared to the mesiodistal axial inclination of a normal control sample by means of the t test. In the group of patients that presented the relapse of mandibular anterior crowding (15 patients), the mean values of the mesiodistal axial inclination at T2 were compared with the mean value at T3 to verify if the alterations in the axial inclination could influence the relapse of mandibular anterior crowding. Results showed that the mesiodistal axial inclinations of the teeth at the beginning of treatment were different from those observed in a normal occlusion in 85% of the evaluated teeth. However, 45% of the teeth at the end, and 55% of the teeth five years posttreatment showed mean values similar to values of the normal occlusion. In relation of the stability of the mesiodistal axial inclination five years posttreatment, 75% of the teeth maintained the inclination obtained at the end of the treatment, independent if these inclinations were similar or not to the normal values. The alterations in the mesiodistal axial inclination between T2 and T3 did not influence the relapse of mandibular anterior crowding.

ASSUNTO(S)

extração dentária maloclusão molar

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