The fundamental aspect in the diagnosis of and treatment planning for an impacted maxillary permanent canine is the ability to recognize and predict its subsequent failure of eruption. Early diagnosis of canine displacement, in relation to the surrounding structures, is based primarily on a radio graphic examination. Nowadays CT scanning units are relatively few and imaging is expensive, their use is increasing. and they are now more freely available to the orthodontist in practice. It may still be difficult to justify using the method on a routine basis for the occasional and more...