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Abstract

Objective: To retrospectively study the dentition of southern Taiwan children with unilateral complete cleft lip and alveolus for the prevalence of hypodontia. Patients: 680 Taiwan children with unilateral complete cleft lip and alveolus aged between 10 and 12 years from July, 1983 to June, 2008 in Department of Orthodontics, Kaohsiung Chang Gung Memorial Hospital. Material and methods: Dental records were studied as were the panoramic radiograph, periapical films of anterior teeth, upper occlusal films and dental model from which the dentition was examined. Results: The prevalence of congenitally missing maxillary lateral incisor was 79.12% of cleft side and 3.82% on non-cleft side. The prevalence of congenitally missing maxillary central incisor was 4.85% of cleft side and 0.29% on non-cleft side. The prevalence of congenitally missing maxillary second premolar was 2.79% of cleft side and 2.06% on the non-cleft side. The prevalence of bilateral congenitally missing maxillary lateral incisor, central incisor and second premolar was 3.82%, 0.29% and 0.88% respectively. Conclusion: This group of Taiwan children with unilateral complete cleft lip and alveolus demonstrated the highest prevalence of congenitally missing maxillary lateral incisor on the cleft side followed by maxillary central incisor on the cleft side and then maxillary lateral incisor on the non-cleft side.

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