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The British Standards classification defines a Class2 division1 incisor relationship as follows: the lower incisor edges lie posterior to the cingulum plateau of the upper incisors, there is an increase in overjet and the upper central incisors are usually proclined.
In a Caucasian population the incidence of Class2 division1 incisor relationship is approximately 15-20 per cent.
Prominent upper incisors, particularly when the lips are incompetent, are at increased risk of being traumatized. It has been shown that children with an overjet greater than 9 mm are twice as likely to have suffered trauma involving their upper incisor teeth as are those with normal or reduced overjets.