The importance of controlling vertical movement of posterior teeth for a Class II malocclusion in a non-growing patient: a case report

ABSTRACT Objective This case report emphasizes the importance of controlling vertical movement of posterior teeth for a non-growing Class II malocclusion with a complete deep overbite and large overjet. The intrusion of incisors without molar extrusion is one of the key factors for the aesthetics and stability of treatment outcomes. Case A 19-year-old woman had a chief complaint of excessive incisor display while smiling. She was diagnosed with an Angle Class II malocclusion with a complete deep overbite and large overjet caused by the improper interposition of her lower lip and overerupted incisors. To achieve satisfactory results, the vertical movements of posterior teeth needed to be controlled. Two orthodontic miniscrews were used in her maxillary arch to intrude the incisors and control the movement of molars. Concurrently, a utility intrusion arch was used to intrude and labially incline the lower incisors. Treatment result Her upper and lower incisors had been intruded by 4 mm and 3 mm, respectively, without the extrusion of posterior teeth. The-lip-to-incisor relationship at rest position had been improved and she was pleased with the results. Conclusion These mechanics were effective for a complete deep overbite correction without undesirable effects.