Rapid maxillary expansion with incisor intrusion: a study of vertical control.
This is a prospective study of 20 consecutively treated patients needing maxillary expansion and incisor intrusion. The patients were treated with a bonded maxillary expansion appliance, intrusion of the incisors with either a one-piece or three-piece base arch and anchorage augmented by the use of vertical-pull chincup therapy. Because rapid palatal expansion and intrusion of maxillary incisors both produce extrusion of posterior teeth, this study was undertaken to determine if a combination of controlled forces could prevent undesirable increases in vertical dimension. The maxillae were widened approximately 8 mm, the incisors were intruded 3 mm, the maxillary molars stayed the same or were intruded slightly, and the mandibular plane angle stayed essentially the same. In addition, A-point was retracted slightly and the occlusal plane was rotated in a counter-clockwise direction.
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D002508:Cephalometry / Q000706:statistics & numerical data; D002648:Child; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008310:Malocclusion / Q000628:therapy; D008437:Maxilla; D010155:Palatal Expansion Technique / Q000295:instrumentation*; D011446:Prospective Studies; D013997:Time Factors; D014087:Tooth Movement Techniques / Q000295:instrumentation*