Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, vol.20, no.1, pp.12-18, 2010 (Peer-Reviewed Journal)
Purpose: There are numerous studies about tooth
agenesis, but most focus on the absence of teeth not
the patterns of absent teeth. The purpose of this
study was to document TAC values in a sample of
orthodontic patient population.
Material and Methods: Orthopantomograms of
2733 orthodontic patients (1674 females and 1059
males) between the ages of 12 and 25 years were
examined for the evidence of hypodontia. The TAC
method was used to determine TAC and TACoverall
values for combination patterns of absent teeth.
Results: It was found that 710 (26%) patients had
1600 missing teeth, including third molars. There were
79 combination patterns of these missing teeth. A
number of 31 patterns were occurred more than one
and symmetrical patterns were clearly showed in
congenitally missing teeth.
Conclusions: In this study, the symmetry and
combinations of tooth agenesis in an orthodontic
patient population by using the TAC and TACoverall
values were performed.