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Ab b s s t t r r a a c c t t 114 Treatment of anterior open bite with palatal crib and chincup: study of dentoalveolar and soft tissue effects The aim of this clinical, prospective and randomized study was to investigate the dentoalveolar and soft tissue effects of anterior open bite palatal crib and chincup treatment. The study group consisted of 60 caucasian children, of both genders, in mixed dentition phase, with permanent incisors and first molars completely erupted, presenting a Class I malocclusion with anterior open bite. This sample was randomly divided into two groups of 30 individuals each one. The treatment group (Group 1) had an initial mean age of 8.33 years, while the control group (Group 2) had an average of 8.61 years old. The evaluation period comprised the interval of 1 year between the first (T1) and the second (T2) lateral cephalometric radiographs. The experimental group used removable cribs in integral period (except for meals and oral hygiene) and chincup to sleep, with a force level of 450 to 500 g per side, passing 45o above the oclusal plane. The means and standard deviations for linear and angular cephalometric measurements were statistically analyzed by the non-paired “t” test, in a level of significance set at p< 0.05. Initial cephalometric variables were shown to be similar between the groups. The intergroup assessment of the alterations verified no significant difference in molar eruption level or in soft tissue anteroinferior height, suggesting that vertical control effects expected of the chincup did not occurred. On the other hand, dentoalveolar modifications in the anterior region were evident, with statistically significant extrusion, retrusion and lingual tipping of both upper and lower incisors. Such effects, probably due to the cribs, were the main responsible for the closure of the open bites in the experimental group. However, these hard tissue alterations did not implied expressive soft tissue modifications, once the variables related to soft profile did not present any statistically significant changes when the groups were contrasted. Abstract

Tratamento da mordida aberta anterior com grade palatina e mentoneira: estudo comparativo dos efeitos dentoalveolares e tegumentares