Abstract
A statistical investigation of impacted teeth in permanent dentition (except the third molar) was carried out in 116 patients with cleft lip and/or cleft palate who were treated in our clinic between April 1,1989., and March 31,1994. The results were as follows:
1) Forty-seven impacted teeth were noted in 23 (19.8 %) of 116 patients.
2) Impacted teeth were present in the maxilla alone in 11.2 %, in both the maxilla and mandible in 5.2 %, and in the mandible alone in 3.4 % of the patients. Twenty-nine impacted teeth were in the maxilla, and 18 were in the mandible.
3) Of the impacted teeth,31.9 % were the lower second bicuspids,27.7% were the upper second bicuspids, and 10.6 % were the upper cuspids.
4) The frequency of numerical anomalies o f teeth was evaluated in patients with cleft lip and/or cleft palate having impacted teeth. Numerical anomalies were observed in 63.2 % of those with impacted teeth in the maxilla but not in the remaining 36.8 %. None of the patients with impacted teeth in the mandible had numerical anomaly.
