Dentofacial anomalies related to the digit sucking habit.

Digit (thumb or finger) sucking is the most common oral habit, frequently seen among young children. With an increase in the prevalence of the oral habit in Nigeria in recent years there should be an expected increase in the dentofacial effects of the habit. In this study 81 children, 29 males and 52 females aged 3-16 years were examined. Each child was still actively engaged in the digit sucking habit. Subjects were divided into 3 age groups--3-6 years, 7-10 years and 11 years and above. The dentofacial effects of the habit on each subject were assessed. Increased overjet was observed in 63-705 of the children in the different age groups while the occurrence of anterior open bite ranged from 33.3% to 80% declining in frequency with increase in age. Unilateral posterior crossbite was observed in 8.65 of children while no case of bilateral crossbite was observed. Lip incompetence occurred in 51.8% of children examined, occurring most frequently in the oldest age group. Class 2 skeletal pattern was observed in 22.2% of the sample population. Results show that malocclusion is a frequent result of digit sucking especially when prolonged. There is a need to increase social awareness of the detrimental effects of this habit and if necessary offer alternative non-nutritive sucking methods.