American Journal of Orthodontics & Dentofacial Orthopedics
Volume 142, Issue 3 , Pages 406-409, September 2012
Bonding a flexible spiral wire retainer to the lingual surfaces of all 6
anterior mandibular teeth is a commonly used type of retention.
Complications are rare but can be serious enough to produce biologic
damage. This article presents a serious complication of a lingual
flexible spiral wire retainer. Four years after the orthodontic
treatment, a 20-year-old man sought treatment for a broken flexible
spiral wire retainer. The clinical examination showed about 35° of
buccal root torque of that tooth. A cone-beam computed tomography image
showed that the root and the apex of the tooth were almost completely
out of the bone on its buccal side. Surprisingly, the tooth's vitality
was preserved. The tooth was moved back, nearly to its original
position; clinically, only a gingival recession remained. Orthodontists
and dentists should be aware of possible complications of bonded
retainers. Patients should be clearly informed how to detect problems at
an early stage.
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