Abstract
Tooth shape deviations are a rare dental anomaly described in premolars and are characterized by simultaneous increased mesiodistal and decreased buccolingual dimension compared with other normal teeth. Man consulted the dentist with a complaint of misaligned teeth and requested orthodontic evaluation. After analysis of the plaster study models, it was noted that both mandibular first premolars presented a crown with an irregular shape (tooth shape deviation), larger mesiodistal measurement (11 mm), and discreetly smaller buccolingual measurement (8 mm) than the conventional premolars. Teeth are susceptible to developmental alterations, which may be primary or arise secondarily because of environmental influences. Along with alterations in size and shape, tooth shape deviation can also occur. These deviations alter the arch perimeter, leading to retention of the permanent canines and tooth crowding.
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