Abstract
ABSTRACTAngle Class III malocclusion is characterized by an anteroposterior dental discrepancy with or without anteroposterior and vertical skeletal changes. Patients usually seek orthodontic treatment because facial appearance is compromised in most cases. The present study describes the clinical case of a 12-year and 6-month-old girl in her final stage of pubertal growth presenting Class III malocclusion with anteroposterior and vertical discrepancies. Initial treatment consisted of maxillary expansion using a Hass expander followed by the use of a Petit facemask for a minimum of 16 hours a day. During corrective treatment, Class III elastics were used to complement protraction. At the end of the treatment, skeletal discrepancy had improved, and the ANB angle increased from 0 to 2o. Angle Class III malocclusion, anterior crossbite and open bite were corrected. This case was presented to the Committee of the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as part of the requisites to become a BBO Diplomate.
Highlights
A healthy 12-year and 6-month-old girl presented for an initial clinical examination. Her main complaint was that her mandibular teeth were in an anterior position in relation to her maxillary teeth, which compromised her facial esthetics (Fig 1)
More markedly, and the mandible were retruded in relation to the cranial base, which resulted in a concave profile (SNA = 77o and SNB = 77o, convexity angle = -2o) (Figs 1 and 4)
The following results were defined as the objectives of orthodontic treatment: to harmonize profile by improving skeletal positioning, to correct negative mandibular discrepancy and to retract mandibular incisors; to expand the maxilla to ensure a more effective protraction and to maintain facial height and prevent its increase
Summary
Angle Class III malocclusion is characterized by an anteroposterior dental discrepancy with or without anteroposterior and vertical skeletal changes. Angle Class III malocclusion, anterior crossbite and open bite were corrected. This case was presented to the Committee of the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as part of the requisites to become a BBO Diplomate. A má oclusão de Classe III de Angle tem como característica uma discrepância dentária anteroposterior, que pode ou não estar acompanhada por alterações esqueléticas tanto no sentido anteroposterior quanto no vertical. O presente artigo descreve o caso clínico de uma paciente com doze anos e seis meses de idade, portadora de má oclusão de Classe III, com discrepância anteroposterior e vertical, em fase final de crescimento.
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