For example, in a study in an Egyptian population, approximately 97% of root canals in first premolars presented as a single canal; the rest had two canals. Other research showed that about 98% of ...

The aim of this study was to compare mandibular form (i.e., size and shape) between patients with agenesis of the lower second premolar (P2) and a control group with no agenesis. Three hypotheses ...