title: Management of open bite that developed during treatment for internal derangement and osteoarthritis of the temporomandibular joint.
abstract: This case report describes the orthodontic treatment performed for open bite caused by internal derangement (ID) and osteoarthritis (OA) of the temporomandibular joint (TMJ). A Japanese woman, aged 31 years and 11 months, referred to our department by an oral surgeon had an open bite with clockwise rotation of the mandible and degeneration of the condyle. The overbite was corrected through intrusion of the maxillary and mandibular molars using mini-screw implants to induce counterclockwise rotation of the mandible. Then, the mandibular second premolars were extracted and comprehensive orthodontic treatment was performed to establish a Class I molar relationship with distalization of the maxillary arch and to eliminate anterior crowding. Following treatment, her facial profile improved and a functional and stable occlusion was achieved without recurrence of the TMJ symptoms. These results suggest that orthodontic intrusion of the molars is one of the safer and less stressful alternatives for the management of open bite due to degeneration of the condyles caused by ID and OA of TMJ.
authors.affiliation: Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Arai
authors.affiliation: Private Practice, Seoul, Korea.
authors.forename: Jae Won
authors.initials: JW
authors.lastname: Choi
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Nakaoka
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Hamada
authors.affiliation: Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Nakamura
keywords: Internal derangement; Mini-screw implant; Osteoarthritis; Temporomandibular joint