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Rapid canine retraction in a Class II bialveolar protrusion case using a lingually extended distraction screw

Korean Journal of Orthodontics 2006³â 36±Ç 4È£ p.308 ~ 320
¾È±¤¼®, Joo Euk, ¹ÚÁÖ¿µ, À¯¿µ±Ô, Â÷ÀÎÈ£, À̱âÁØ,
¼Ò¼Ó »ó¼¼Á¤º¸
¾È±¤¼® ( Ahn Kwang-Seok ) - Yonsei University College of Dentistry Department of Orthodontics
 ( Joo Euk ) - Yonsei University College of Dentistry Department of Orthodontics
¹ÚÁÖ¿µ ( Park Ju-Young ) - Yonsei University College of Dentistry Department of Orthodontics
À¯¿µ±Ô ( Ryu Young-Kyu ) - Yonsei University College of Dentistry Department of Orthodontics
Â÷ÀÎÈ£ ( Cha In-Ho ) - Yonsei University College of Dentistry Department of Oral and Maxillofacial Surgery
À̱âÁØ ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics

Abstract

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Rapid canine retraction, first introduced by Liou, is a distraction osteogenesis applied to the periodontal ligament tissue. Rapid tooth movement was facilitated by establishing minimal bony resistance on the distal surface of the canine by socket preparation and by osteogenesis on the mesial side in response to the periodontal distraction. Since undesired buccal tipping or extrusion of the canine during retraction tends to occur, it is crucial to maintain the firm path of movement and the axis of the canine during retraction. In order to improve the predictability of the canine movement, lingually extended distraction screws with heavy labial guiding wires were designed. Prefabricated plastic canine models for the estimation of socket depth and miniscrew implants for anchorage reinforcement were also devised. Applying these devices to a female patient with Class II anterior protrusion, the whole treatment was effectively finished in 13 months. Loss of vitality or periodontal problems did not occur throughout treatment, and stable occlusion was maintained during 10 months of retention. This case report demonstrates that a predictable rapid canine retraction can be achieved through the use of this modified technique.

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Rapid canine retraction;Periodontal distraction;Lingually extended distraction screw;Anterior protrusion

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