Abstract
OBJECTIVE: The aim of this prospective study was to cephalometrically analyze the stability of dentoalveolar and skeletal changes produced by a removable appliance with palatal crib associated to high-pull chincup in individuals with anterior open bite treated for 12 months, and compare them to individuals with similar malocclusion and age, not submitted to orthodontic treatment, also followed for the same period. METHODS: Nineteen children with a mean age of 9.78 years old treated for 12 months with a removable appliance with palatal crib associated with chincup therapy were evaluated after 15 months (post-treatment period) and compared with a control group of 19 subjects with mean age of 9.10 years with the same malocclusion that was followed-up for the same period. Seventy-six lateral cephalograms were evaluated at T1 (after correction) and T2 (follow-up) and cephalometric variables were analyzed by statistical tests. RESULTS: The results did not show significant skeletal, soft tissue or maxillary dentoalveolar changes. Overall, treatment effects on the experimental group were maintained at T2 evaluation with an increase of 0.56 mm in overbite. Overjet and maxillary incisors/molars position (vertical and sagittal) remained essentially unchanged during the study period. Only mandibular incisors showed significant changes (labial inclination and protrusion) compared to control group. CONCLUSIONS: Thus, it can be concluded that the early open bite treatment with a removable appliance and palatal crib associated with high-pull chincup therapy provided stability of 95%.
Highlights
Introduction and literature reviewStability in orthodontic treatments has always been a challenge for the orthodontists
Due to the lack of studies with appropriate methodology for evaluating treatment stability of anterior open bite in the mixed dentition, it was aimed to cephalometrically analyze the stability of dentoskeletal and profile changes in the treatment with removable appliance with palatal crib associated to high-pull chincup therapy in young patients with anterior open bite who had been treated for 12 months, and to compare them to similar individuals who had not undergone orthodontic treatment
Material and Methods The present study was derived from the research of Ferreira Pedrin in 2006,14 which consisted of a prospective randomized study with the treatment of 30 individuals with anterior open bite, who had been compared to a similar control group composed of 30 individuals
Summary
Stability in orthodontic treatments has always been a challenge for the orthodontists. Correction of vertical dysplasia, such as anterior open bite, has presented high indexes of relapse. Several treatment protocols have been indicated, in different ages, with the same objectives, for reaching an occlusal and facial harmony,[1,8,11,12,13,19,25] and, longterm stability. Evaluating the orthodontic literature, focusing on anterior open bite treatments in the mixed dentition,[24] only two randomly controlled studies reached the requirements for this selection. Other systematic reviews[8,18] evidenced the lack of studies investigating the stability in the mixed dentition, using a treatment protocol and comparing to a matched control group
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