title: Unilateral maxillary molar distalization with zygoma-gear appliance.
abstract: The aim of this study was to present the orthodontic treatment of a 15-year-old boy with a unilateral maxillary molar distalization system, called the zygoma-gear appliance. It consisted of a zygomatic anchorage miniplate, an inner bow, and a Sentalloy closed coil spring (GAC International, Bohemia, NY). A distalizing force of 350 g was used during the distalization period. The unilateral Class II malocclusion was corrected in 5 months with the zygoma-gear appliance. The maxillary left first molar showed distalization of 4 mm with an inclination of 3°. The maxillary premolars moved distally with the help of the transseptal fibers. In addition, there were slight decreases in overjet (-0.5 mm) and maxillary incisor inclination (-1°), indicating no anchorage loss from the zygoma-gear appliance. Preadjusted fixed appliances (0.022 × 0.028-in, MBT system; 3M Unitek, Monrovia, Calif) were placed in both arches to achieve leveling and alignment. After 14 months of unilateral distalization with the zygoma-gear appliance and fixed appliances, Class I molar and canine relationships were established with satisfactory interdigitation of the posterior teeth. Acceptable overjet and overbite were also achieved. This article shows that this new system, the zygoma-gear appliance, can be used for unilateral maxillary molar distalization without anchorage loss.
authors.affiliation: Research assistant, Department of Orthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
authors.forename: Dogan
authors.initials: D
authors.lastname: Kilkis
authors.forename: Mehmet
authors.initials: M
authors.lastname: Bayram
authors.forename: Mevlut
authors.initials: M
authors.lastname: Celikoglu
authors.forename: Metin
authors.initials: M
authors.lastname: Nur
mesh_terms: D000293:Adolescent; D001860:Bone Plates; D002508:Cephalometry; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy; D008437:Maxilla; D008963:Molar / Q000473:pathology*; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation* / Q000379:methods; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D010347:Patient Care Planning; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques / Q000295:instrumentation* / Q000379:methods; D016896:Treatment Outcome; D015050:Zygoma / Q000601:surgery