title: A novel approach in treatment of maxillary deficiency by reverse chin cup.
abstract: The aim of this study was to evaluate the effectiveness of a newly designed small-sized extraoral appliance on Class III malocclusion and maxillary deficiency in growing patients. The case series included 10 patients (4 males, 6 females) with a mean age of 8.9 +/- 1.72 years who suffered from maxillary deficiency. All the patients were treated with an extra oral appliance which was named as reverse chin cup. This appliance consisted of a high pull cap, a chin cup with two vertical hooks, a removable appliance on the upper jaw, and two elastics which connected the hooks of the cup to the hooks of the removable appliance. The mean treatment time was 24 +/- 9 months. Mean SNA and ANB were significantly increased by 3.1 degrees +/- 1.6 degrees and 3.5 degrees +/- 1.7 degrees, respectively (p<0.001). The level of significance was set at P<0.05. The increase of SNA angle and ANS-PNS distance (p<0.001) and the decrease of nasolabial angle (P<0.004) indicated that the reverse chin cup was effective in moving the maxilla in a forward position. Moreover, the smaller size of this appliance makes it more favorable for patients.
authors.affiliation: School of Dentistry, Shahid Beheshti Medical Sciences University.
authors.forename: Rahman
authors.initials: R
authors.lastname: Showkatbakhsh
authors.forename: A
authors.initials: A
authors.lastname: Jamilian
mesh_terms: D002508:Cephalometry / Q000379:methods; D002648:Child; D005115:Extraoral Traction Appliances; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008046:Lip / Q000473:pathology; D008297:Male; D008313:Malocclusion, Angle Class III / Q000628:therapy*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000002:abnormalities* / Q000473:pathology; D009295:Nasal Bone / Q000473:pathology; D016382:Orthodontic Appliance Design; D009968:Orthodontic Appliances, Removable; D012189:Retrospective Studies; D012658:Sella Turcica / Q000473:pathology; D013997:Time Factors