Abnormalities Number 1) Partial anodontia or hypodontia: We use this term when a loss of up to six teeth in the dental arch. The prevalence of partial anodontia is very high, reaching, according to some authors, up to 20% of the population. It affects different dental groups, with predominance of upper lateral incisors, second premolars and third molars. In general, teeth that are affected more often we see that are more distal teeth of different tooth groups.
The hypodontia have a strong genetic pattern, and often repeated the same agenesis in different individuals of the same family. Left lateral incisor agenesis in a patient of 20 years which has just exfoliate the temporal side. We rule out the existence of a radiographic dental impaction, and warn the patient of frequent family pattern of abnormality. Agenesis of the four second premolars. Faced with a delay of more than a year in the exfoliation of primary teeth, we must make a radiographic study to determine if there is agenesis, delayed eruption, or an obstacle to the eruption. 2) Hipergenesia: In the presence of an excessive number of teeth we call hipergenesia or hyperdontia.
A teeth over the temporary call, so called because they exceed the normal number in the arcade. The hipergenesia may coincide in the same individual with agenesis, so not always hipergenesia to an increased number of teeth. Therefore, we prefer to analyze the number of teeth group teeth (incisor, canine, premolar and molar). The hipergenesias have a frequency ranging between 0.5 and 3%, with some racial variability.