Bimaxillary Total Arch Intrusion in Lingual Orthodontics for Hyperdivergent Class II Face with Asymmetry and Lip Protrusion
조웅기, 서희주, 금병탁, 이기준,
소속 상세정보
조웅기 ( Cho Ung-Ki ) - Yonsei University College of Dentistry Department of Orthodontics
서희주 ( Seo Hui-Joo ) - Yonsei University College of Dentistry Department of Orthodontics
금병탁 ( Keum Byeong-Tak ) - Yonsei University College of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
KMID : 1149920200090010006
Abstract
Hyperdivergent Class II face is accompanied by a convex profile, while it is usually characterized by upright upper and/or lower incisors. Thus, it is important to precisely maintain an axis of upper incisors during retraction. Particularly, axis control of upper incisors is more difficult in lingual orthodontics. Unlike in the buccal appliance, traction force pushes the wire out of horizontal slot in the lingual appliance, so sufficient moment for torque control of incisors may not be obtained. Therefore, excessive overtorque should be placed on the archwire for making same amount of moment and accomplishing incisor translation. Furthermore, to correct lip protrusion and lip incompetency in this patient, bimaxillary total arch intrusion and maximum retraction of incisors was also treatment objective to improve soft tissue problems. This case report demonstrates satisfactory results through bimaxillary total arch intrusion with translation of upper incisors and intrusion of lower incisors using palatal/lingual miniscrews and continuous arch with additional torque for axis control of incisors in lingual orthodontics.
키워드
Gummy smile; Lip incompetency; Total arch intrusion; Anterior torque control
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