Numerical Anomalies and Relationship With Malocclusion in Cambodian Orthodontic Patients

Objectives: To evaluate the prevalence and distribution of hypdontia and supernumerary teeth in pre-treatment records of Cambodian orthodontic patients according to gender and malocclusion types.
Methods: Two observers examined 438(140 males, 298 females) orthopantomograms with complete pre-orthodontic records. The prevalence and distribution of the anomalies were assessed and reported as descriptive statistics. Significance was set at P < 0.05.
Results: Patients were between 7.5 and 47 years (mean 17.19 ± 5.5). Prevalence of hypodontia was 9.3 % (8.6 % male, 9.7 % female). The prevalence of supernumerary teeth was 6.4 % (12.1 % male, 3.7 % female). Prevalence of hypodontia according to malocclusions was: Class I (14.6%), Class II Division 1 (6.1%) and Class III (10.1%). Prevalence of supernumerary teeth according to malocclusions was: Class I (6.3%), Class II Division 1 (5.5%) and Class III (7.7%).). There was significantly higher prevalence of supernumerary teeth in males than females in Class II div1 and Class III subgroups. The most common supernumerary teeth was Mesiodens (3%). The most common missing teeth were upper lateral incisors (5.1%).
Conclusions: A remarkably high rate of dental anomaly in number was recorded in orthodontic patients; therefore, orthodontists should carefully examine pre-treatment records for these anomalies to include their management in the treatment planning.