title: Diagnosis and conservative treatment of skeletal Class III malocclusion with anterior crossbite and asymmetric maxillary crowding.
abstract: A man, aged 28 years 9 months, came for an orthodontic consultation for a skeletal Class III malocclusion (ANB angle, -3°) with a modest asymmetric Class II and Class III molar relationship, complicated by an anterior crossbite, a deepbite, and 12 mm of asymmetric maxillary crowding. Despite the severity of the malocclusion (Discrepancy Index, 37), the patient desired noninvasive camouflage treatment. The 3-Ring diagnosis showed that treatment without extractions or orthognathic surgery was a viable approach. Arch length analysis indicated that differential interproximal enamel reduction could resolve the crowding and midline discrepancy, but a miniscrew in the infrazygomatic crest was needed to retract the right buccal segment. The patient accepted the complex, staged treatment plan with the understanding that it would require about 3.5 years. Fixed appliance treatment with passive self-ligating brackets, early light short elastics, bite turbos, interproximal enamel reduction, and infrazygomatic crest retraction opened the vertical dimension of the occlusion, improved the ANB angle by 2°, and achieved excellent alignment, as evidenced by a Cast Radiograph Evaluation score of 28 and a Pink and White dental esthetic score of 3.
authors.affiliation: Lecturer, Beethoven Orthodontic Center, Hsinchu, Taiwan.
authors.forename: Linda L Y
authors.initials: LL
authors.lastname: Tseng
authors.affiliation: Director, Beethoven Orthodontic Center, Hsinchu, Taiwan.
authors.forename: Chris H
authors.initials: CH
authors.lastname: Chang
authors.affiliation: Professor emeritus, School of Dentistry, Indiana University; adjunct professor, School of Mechanical Engineering, Indiana University and Purdue University at Indianapolis, Indianapolis, Ind; visiting professor, Department of Orthodontics, School of Dentistry, Loma Linda University, Loma Linda, Calif. Electronic address: werobert@iu.edu.
authors.forename: W Eugene
authors.initials: WE
authors.lastname: Roberts
mesh_terms: D000328:Adult; D002508:Cephalometry / Q000379:methods; D019243:Enamel Microabrasion / Q000379:methods; D004955:Esthetics, Dental; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000175:diagnosis* / Q000628:therapy; D008313:Malocclusion, Angle Class III / Q000175:diagnosis* / Q000628:therapy; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D018704:Orthodontic Retainers; D057887:Overbite / Q000175:diagnosis / Q000628:therapy; D010347:Patient Care Planning; D014087:Tooth Movement Techniques / Q000295:instrumentation; D016896:Treatment Outcome; D014716:Vertical Dimension