Tratamento da mordida aberta anterior com intrusão de molares utilizando ancoragem esquelética

relato de caso

Abstract

Anterior open bite (AOB) is a malocclusion characterized by a negative overbite. The present study aims to report a case of AOB treatment through maxillary molar intrusion using skeletal anchorage. A 25-year-old female patient was referred for orthodontic treatment due to the chief complaint of AOB relapse. Extraoral examination revealed mandibular retrognathism with passive lip seal. Intraoral examination showed crowding of the maxillary incisors, absence of the maxillary first premolars, bilateral Angle Class II molar relationship, while the canines presented a Class I relationship on the left side and Class II on the right side, along with tongue interposition. Passive self-ligating esthetic brackets were used for dental alignment and leveling of the arches. For maxillary molar intrusion, palatal mini-implants and buccal miniplates were initially installed, which were replaced by buccal mini-implants after 6 months of treatment. In the final phase of treatment, intermaxillary elastics were used on the maxillary canines and on the mandibular canines and first premolars to achieve occlusal settling. Treatment was completed after 23 months, resulting in closure of the AOB, a 2 mm overbite, and correction of dental alignment. The molars remained in Class II relationship, and a Class I canine relationship was achieved. AOB cases represent a major challenge in Orthodontics, depending on accurate diagnosis and proper biomechanical management. It was therefore concluded that the treatment was successfully completed due to correct diagnosis, appropriate application of biomechanical principles, and patient compliance.