Tratamento da classe III com mordida aberta anterior / The treatment of class III with anterior open bite – case report

O tratamento de classe III realizado no momento oportuno previne maiores discrepâncias na fase adulta. Este trabalho teve como objetivo demonstrar a efetividade do aparelho de Hyrax associado ao uso da máscara de Petit, em um relato de caso clínico. Paciente do sexo feminino, na fase do surto de crescimento puberal, apresentava classe III esquelética com atresia maxilar, mordida cruzada posterior e mordida aberta anterior. O tratamento proposto foi o uso do disjuntor de Hyrax associado ao uso da máscara facial de Petit. O tratamento se mostrou efetivo, colaborando para a melhora da relação das bases ósseas de classe III e correção da mordida aberta anterior...

The treatment of class III if done in the correct age can avoid major discrepancies in adulthood. This work aims to demonstrate the effectiveness of Hyrax associated with the use of the Petit's mask in a case report. Female patient in growth stage, skeletal class III with maxillary atresia, posterior cross bite and anterior open bite. The proposed treatment was the use of Hyrax and use of facial mask. This treatment demonstrated be effectively contributing to an improvement of the relationship of class III with the closure of the anterior open bite...

Effects of injury or removal of the articular disc on maxillomandibular growth in young rats.

PURPOSE: This study analyzed the effects of injury and removal of the articular disc on maxillomandibular growth in young rats. MATERIALS AND METHODS: Thirty 1-month-old male Wistar rats were divided into 3 groups: injury, removal, and sham operated. Unilateral injury of the articular disc, removal of the articular disc, or only surgical access was performed. The animals were sacrificed at 3 months of age. Specimens were submitted to radiographic incidences and cephalometric mensurations were performed using a computer system. Data were subjected to statistical analyses among groups and between sides in each group. RESULTS: There were degenerative changes of the condylar process in the injury and removal groups. Significant differences between sides were observed for length of the premaxilla, height of the mandibular body, and length of the mandible. Concomitant group comparisons showed significant differences in the height of the mandibular body (P = .003) and the length of the mandible (P = .001). There were important decreases to the height of the mandibular body and mandibular length in the injury group, whereas there was an important decrease only for the length of the mandible in the removal group. Specific measurements of mandibular ramus structures exhibited differences between the injury and sham-operated groups and between the removal and sham-operated groups. CONCLUSION: Experimental injury and removal of the articular disc during the growth period in rats had deleterious effects on ramus structures and induced asymmetry of the mandible, with worse outcomes resulting from injury to the articular disc.