A comparison of Numerical anomalies in cleft and non-cleft patients

Objectives: To determine the frequency and distribution of hypodontia and supernumerary teeth in the permanent dentition of Cambodian orthodontic patients.
Methods: Sample consists of 482 patients. Group 1: 438 non-cleft patients (140 male and 198 female), mean age 17.19±SD5.50 years. Group 2: 44 cleft patients (15 male and 29 female), mean age 12.50±SD4.27 years. Numerical anomalies of the permanent dentition (not inclusive the 3^rd molars) were observed on Panoramic X-ray by two researchers independently. The data was recorded and analyzed using SPSS version 21.0.
Results: Hypodontia (not inclusive of third molars) was observed in 9.4% of Group 1 and 65.9% of Group 2 patients, P<0.001. The most commonly missing tooth was upper right lateral incisor (Gp 1: 3.0%, Gp 2: 34.1%) followed by upper left lateral incisor (Gp 1: 2.1%, Gp 2: 31.8%). Supernumerary teeth were observed in 6.4% of Group 1 and 13.6% of Group 2 patients, P>0.05. The most common location of supernumerary was in the midline in Group 1, and adjacent to the cleft sites in Group 2.
Conclusions: The cleft patients have a higher prevalence of supernumerary and a significantly higher prevalence of hypodontia than non-cleft patients. The most commonly missing teeth for both groups were the upper lateral incisor.