n. congenital absence of one or more teeth (not including the third molars, whose absence is considered a normal variation). Forms of hypodontia include *oligodontia and *anodontia.
n. absence of an organ, usually due to total failure of its development in the embryo. Dental agenesis (also known as *hypodontia) is the most common developmental anomaly in humans and may be caused by genetic defects in codes for transcription factors, proteins, and fibroblast growth factors.... agenesis
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