Korean J Orthod.  2006 Aug;36(4):308-320.

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

• Ahn KS
• Joo E
• Park JY
• Ryu YK
• Cha IH
• Lee KJ

Abstract

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.

Keyword

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

MeSH Terms

Axis, Cervical Vertebra
Female
Humans
Osteogenesis
Osteogenesis, Distraction
Periodontal Ligament
Plastics
Tooth Movement
Plastics