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* Corresponding author: Professor John Mew Braylsham Castle Broad Oak, Heathfield, Sussex TN21 8TY, UK Tel / Fax: +44 435 862045 e-mail: john.mew@virgin.net Introduction: Impacted maxillary canines are a major problem and expense in orthodontic practice. It seems as though their incidence has risen in recent years. It had been noticed that fewer canines appeared to be impacted amongst patients who had been treated by Orthotropics®, a form of treatment which involves proclining the incisors and expanding the maxilla. The objective was to compare the influence of Orthotropics on the ratio of impacted canines with matched averages from other populations. Methodology: Records over a five year period were taken from a practice specialising in Orthotropics. An audit of the incidence of impacted canines was taken and compared with average frequencies. Results: There appeared to be a zero incidence of impacted canines amongst patients from this practice who started treatment before the age of ten. This compares with an incidence of 31⁄2 % in the wider range of older patients from comparative populations. Conclusion: Expansion coupled with proclination of the incisors in children under nine years old, may reduce or eliminate the impaction of maxillary canines.

Canine impaction: how effective is early prevention? An audit of treated cases