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FTTA in Orthodontics, Orthodontic Department, University Dental Hospital of Manchester, Manchester, M15 6FH and University Hospital of South Manchester, Wythenshawe, M23 9LT, UK
This case report highlights the benefit of Cone Beam Computed Tomography (CBCT) in the diagnosis of incisor root resorption. Management of a 13-year-old patient, who was referred for an orthodontic assessment of an unerupted maxillary canine which was in complete transposition with the upper lateral incisor, is discussed. CBCT highlighted root resorption of the lateral incisor, as well as the central incisor, and provided additional diagnostic information to that shown by plain radiographic films.
Clinical Relevance: To demonstrate the efficacy of CBCT in detecting incisor root resorption secondary to maxillary canine impaction.
Article
Impaction of the permanent canine occurs when its eruption is prevented by being embedded in the alveolus. Careful clinical and radiographic examination is required to identify impacted permanent canines; the optimal age for radiological investigation is 10–13 years.1 The incidence has been reported at 0.98–2.2%.2 Of impacted canines, 20% are buccally placed, with the remainder being positioned either palatally, or distal to the lateral incisor.3
Tooth transposition is a unique type of ectopic eruption in which two teeth have interchanged position in the dental arch;4 or there is development of a tooth in a position normally occupied by a non-adjacent tooth.5 The most common tooth involved is the maxillary canine.4 The aetiology is reported to be multifactorial, including both genetic and environmental factors. The prevalence is less than 1%.5
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