Stability of anterior open-bite treatment with occlusal adjustment.
BACKGROUND
In this study, we aimed to evaluate the long-term stability of anterior open-bite treatment with occlusal adjustment and the dentinal sensitivity caused by this procedure in the long term.


METHODS
The sample comprised 17 open-bite patients who experienced relapse of the negative vertical overbite after orthodontic treatment and were retreated with occlusal adjustment. The cephalometric changes were evaluated on lateral cephalograms obtained before and after the occlusal adjustment and in the long term (mean, 3.4 years after occlusal adjustment). Dentinal sensitivity was also evaluated before the occlusal adjustment, and 1.35 months, 4.61 months, and 3.4 years later. The cephalometric statuses between the 3 evaluations were compared with analysis of variance (ANOVA) and Tukey tests. The percentages of clinically significant relapse were calculated. To compare dentinal sensitivity at the several stages, nonparametric Friedman and Wilcoxon tests were performed.


RESULTS
Statistically significant relapse of anterior open bite occurred in 33.3% of the patients. Those who had the procedure before 21 years of age were most likely to experience relapse. Dentinal sensitivity remained within the normal range in the long term.


CONCLUSIONS
Despite the statistically significant relapse of anterior open bite, clinically significant stability was found in 66.7% of the patients.
Janson
Guilherme
G
Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. jansong@travelnet.com.br
Crepaldi
Marcus Vinicius
MV
Freitas
Karina Maria Salvatore
KM
de Freitas
Marcos Roberto
MR
Janson
Waldyr
W
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000704:Analysis of Variance; D002508:Cephalometry / Q000706:statistics & numerical data; D003807:Dentin Sensitivity / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008963:Molar / Q000254:growth & development; D019558:Occlusal Adjustment / Q000009:adverse effects*; D024343:Open Bite / Q000628:therapy*; D012008:Recurrence; D019233:Retreatment; D012189:Retrospective Studies; D018709:Statistics, Nonparametric; D055815:Young Adult