Avaliação da influência da realização da expansão rápida da maxila sobre a recidiva do apinhamento ântero-superior, em casos tratados ortodonticamente sem extrações / Influence of rapid maxillary expansion in maxillary anterior alignment stability, in nonextraction cases

AUTOR(ES)

Luiz Filiphe Gonçalves Canuto

DATA DE PUBLICAÇÃO

2006

RESUMO

The purpose of this retrospective study was to compare the long-term stability of maxillary incisors alignment in cases treated with or without rapid maxillary expansion (RME) during orthodontic treatment. The sample comprised 48 subjects presenting Class I and Class II malocclusions, treated nonextraction and Edgewise fixed appliances. The sample was divided into 2 groups according to the treatment protocol: Group 1 (with RME) comprised 25 patients (15 female; 10 male) at a mean initial age of 13.53 years (s.d. = ±1.63), who underwent rapid maxillary expansion during orthodontic treatment. Group 2 (without RME) comprised 23 patients (13 female; 10 male) at a mean initial age of 13.36 years (s.d. = ±1.81 years), treated with fixed appliances and no rapid maxillary expansion. Dental casts measurements were obtained at three times of evaluation (pretreatment, posttreatment and postretention) and the variables assessed were Little Irregularity Index, intercanine, interpremolar and intermolar widths, and maxillary arch length and perimeter. The statistical analysis was performed by one-way ANOVA and Tukey tests if necessary (intragroup comparison) and by independent t-tests (Intergroup comparison). Pearson? correlation coefficients were used to investigate possible associations between the variables evaluated. The results evidenced significant transversal increases in group treated with RME (group 1), however, during the postretention period, no significant differences were observed between the groups in the amount of maxillary incisors alignment relapse (+1,52 mm in both groups), as well as in most of the variables evaluated. Therefore, it was concluded that the RME procedure did not influence the long-term maxillary anterior crowding relapse.

ASSUNTO(S)

técnica de expansão palatina recidiva ortodontia corretiva crowding palatal expansion technique corrective orthodontics

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