The aims of the present study were: (i) to identify the association of
patterns of congenitally missing teeth with combinations of ectoderma
l symptoms occurring in patients with oligodontia; and (ii) to propose
a diagnostic scheme for the general practitioner. For this study 167
patients with oligodontia, both isolated and as part of a syndrome, an
d 135 healthy controls were interviewed and documented. Chi-square tes
ts, logistic regression and correspondence analysis were used to evalu
ate and test differences between the groups and associations between t
he congenitally missing teeth and ectodermal symptoms. No significant
differences were found between the control group and the patients with
isolated oligodontia with exception of the skin. It could be conclude
d from the present study that there were no clear associations between
congenitally missing teeth, either individually or patterns, and the
ectodermal symptoms or combinations of ectodermal symptoms. However, i
t could be concluded that if the most stable teeth are missing, or if
the number of missing teeth is large the patient should be examined ca
refully for symptoms of ectodermal dysplasia. Using logistic regressio
n a patient could be classified as having isolated oligodontia or olig
odontia as part of a syndrome with a specificity and sensitivity of 88
.2%.