Cephalometric effects produced by Ten Hour Force Theory application and cervical headgear, both followed by the fixed appliance therapy for Class II treatment / Estudo cefalométrico comparativo entre o recurso da Teoria de Força das Dez Horas e o uso do aparelho extrabucal

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This study aimed to compare the cephalometric effects promoted by two different protocols to correct the Class II malocclusion: Extraoral Appliance associated to fixed appliances and the Ten-Hour Force Theory, that consists in the use of fixed appliances, 8 hours a day using extraoral appliance and 16 hours a day using Class II elastics, 8 hours in the first mandibular molar and 8 hours in the second mandibular molar. The T10 group comprised 31 patients with a mean initial age of 14.90 years, final age of 17.25 years and mean treatment time of 2.35 years. The Extraoral group comprised 28 patients with a mean initial age of 13.98 years, final age of 16.46 years and a mean treatment time of 2.47 years. It was evaluated the lateral cephalograms of all patients in pretreatment and posttreatment stages. Intergroup comparison of treatment changes was performed by t tests. Maxillary molars presented greater distal tipping and extrusion in Extraoral group, showing that mandibular molars did not present greater mesial movement caused by use of elastics in T10 group. Class II molar relationship was better corrected in T10 group than in Extraoral group, certainly due to the lack of patient compliance in the use of extraoral appliance. It was concluded that the Ten Hour Force Theory is valid because use of Class II elastics did not influence mandibular teeth position.

ASSUNTO(S)

angle class ii mallocusion extraoral traction appliances má oclusão de angle classe ii corrective orthodontics ortodontia corretiva aparelhos de tração extrabucal

ACESSO AO ARTIGO

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