References
The aberrant canine part 1: aetiology and diagnosis
From Volume 10, Issue 4, October 2017 | Pages 126-130
Article
The permanent canine usually erupts uneventfully, but occasionally it may fail to do so. When this occurs there is a potential for the adjacent teeth to be damaged. Even when it does not cause any damage, treatment of the ectopically positioned canine can present a substantial challenge to the orthodontist. This paper presents a summary of the development and eruption of the permanent canine, both upper and lower, possible adverse effects of an aberrant position and the different treatment options.
Calcification of the upper and lower permanent canine teeth begins at 4 to 5 months post-partum, with crown formation being complete by the age of 5 years. The lower permanent canine erupts at around 10 years of age (± 6 months) and the upper canine at about 11.5 years (± 6 months). Although the upper permanent canine has a long path of eruption, the crown should be palpable beneath the mucosa in the buccal sulcus by the age of 10 years. Eruption is guided by the distal surface of the lateral incisor root in the case of the maxillary canine, and this can lead to the distal angulation of the lateral incisor. As a result, it is normal to see physiological spacing of the upper incisors in the mixed dentition (Figure 1), often referred to as the ‘ugly duckling’ stage, which then closes as the upper canines erupt, guided by the distal surfaces of the upper lateral incisor roots. Once the canines have fully erupted, the intercanine width in both the upper and lower arches is at its greatest and will then only reduce over time.1
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