Longitudinal dental maturation of children with complete unilateral cleft lip and palate: A case-control cohort study.

OBJECTIVES: Many reports suggest that children with cleft lip and palate (CLP) have delayed dental development and asymmetrical timing of tooth-pair formation. We aimed to investigate the dental maturation of permanent teeth in children with complete unilateral CLP (UCLP) and compare the findings with non-CLP children.

SETTING AND SAMPLE POPULATION: This case-control study used 115 radiographs of children with complete UCLP and controls (non-CLP children matched on age, gender and ethnicity) from a hospital-based dental clinic in Singapore.

MATERIAL AND METHODS: Orthopantomographs of 60 children with complete UCLP (5-9 years old) and 55 children (9-13 years old) from the same cohort were investigated using the Demirjian's method and compared with controls to determine if there were any differences in dental maturation with age.

RESULTS: Delayed dental maturation was found in the 5- to 9-year-old children with UCLP compared to controls by 0.55 years (standard deviation: 0.75) (P<.001). There was no significant difference between the dental maturation of children with UCLP and controls in the 9- to 13-year-old group (P=.744). The group with UCLP had higher risk of asymmetrically developing tooth pairs than the control group for both age groups (P<.001).

CONCLUSION: No difference in dental maturation between UCLP and controls in the 9- to 13-year-old group was found. However, there was diametrical difference in dental maturation in the 5- to 9-year-old group, which attenuated as they grew older. There was a consistently higher risk of asymmetrical tooth formation in children with UCLP than in controls.