Hypodontia

See also: List of dental abnormalities associated with cutaneous conditions
Hypodontia
Pronunciation
  • hi-po-don-ti-ia
SpecialtyDentistry
Types1
CausesEnvironmental or genetic. Can be isolated or associated with syndromes such as ectodermal dysplasia and Down syndrome.
Diagnostic methodDental panoramic tomograph screening, no earlier than 9 years of age
Preventionn/a
Treatment
  • Prevention of tooth loss through caries, periodontal disease and trauma
  • Multidisciplinary approach with paediatric, orthodontic and restorative specialties
  • Management varies with stage of dental development

Hypodontia is defined as the developmental absence of one or more teeth excluding the third molars. It is one of the most common dental anomalies, and can have a negative impact on function, and also appearance. It rarely occurs in primary teeth (also known as deciduous, milk, first and baby teeth) and the most commonly affected are the adult second premolars and the upper lateral incisors. It usually occurs as part of a syndrome that involves other abnormalities and requires multidisciplinary treatment.

The phenomenon can be subdivided into the following according to the number of teeth concerned:

  1. Hypodontia: one to six missing teeth excluding the third molars
  2. Oligodontia: six or more missing permanent teeth excluding the third molars
  3. Anodontia: complete absence of teeth