Correction of skeletal class II severe open bite with temporomandibular joint disorder treated by miniscrew anchorage and molar extraction: a case report

Abstract

Abstract Background Little information is available on the treatment of open bite with temporomandibular joint disorder by intrusion of molars using miniscrews. Case presentation This case report describes a 42-year-old Japanese woman with a skeletal class II severe anterior open bite and temporomandibular joint disorder. The pretreatment magnetic resonance imaging of both temporomandibular joints revealed osteoarthritis and anterior disc displacement without reduction in both temporomandibular joints. A stabilization splint was used before orthodontic treatment and bilateral upper and lower premolars were extracted. Miniscrews were inserted into the palatal region to intrude the maxillary molars and avoid loss of anchorage. The maxillary left first molar was also extracted to improve the molar relationship and the dental midline. Normal overjet and overbite with Angle class I molar relationship were achieved, and the upper and lower midlines coincided. Our patient’s teeth continued to be stable and her temporomandibular joint was asymptomatic after a retention period of 2 years. Conclusions Intrusion of molars by miniscrews is available for skeletal class II severe open bite.

Keywords

• Open bite
• Skeletal class II
• Steep mandible
• TMD
• DDwoR
• Stabilization splint