Tratamento ortopédico da má oclusão de Classe III de angle com hyrax e máscara facial de petit: revisão de literatura

Abstract

Introduction: Malocclusions are classified according to the anteroposterior relationship of the first permanent molars. Class III malocclusion is characterized by a mesio- occlusion of the lower first molar, anterior crossbite and concave facial profile. It is caused by a dento-skeletal disharmonie that can be characterized by anterior mandibular position in relation to maxilla. The early treatment involve orthopedic intervention during craniofacial growth phase, by the maxillary disjunction and face-mask therapy for maxillary protraction. Due to the maxilla is moved forward and downward, a correction of anterior crossbite and abnormal maxillomandibular relationship is achieved. Objective: To review the literature on orthopedic treatment of Class III malocclusion using the Hyrax device associated with the Petit facial mask. Methodology: The bibliographic survey was carried out from didactic books and electronic searches, in the databases: Bireme, LILACS, PubMed and Scielo. Using the keywords: palatine disjunction, Angle Class III malocclusion, Petit facial mask and maxillary protraction, in Portuguese and English.Works, containing significant information were included, however, abstracts and texts that cited the topic without discussing it were discarded. After careful reading of the selected articles, the works that contained eligibility criteria were compiled in this work. Conclusion: Based on the above, it is concluded that the use of orthopedic therapy provides satisfactory aesthetic and occlusal results, if initiated early, between 5 and 10 years.