Orthodontic problems

Class I malocclusion

A Class l malocclusion occurs when the teeth meet together correctly, but are crowded. Depending on the degree of crowding, space may need to be made by removing some teeth before braces can be put on.

In Britain, about 45% of the population have malocclusions of this type.

Class II division 1 malocclusion

A Class II Division 1 malocclusion occurs when the upper teeth stick out far in front of the lower teeth and are tipped forwards. Crowding may also be present. Depending on the degree of discrepancy, headgear, extractions or surgery may be needed.

Approximately 34% of the population suffers from this malocclusion.

Class II division 2 malocclusion

A Class II Division 2 malocclusion occurs when the upper teeth protrude but are tipped backwards instead of forwards. The overjet may not be greatly changed, but the overbite gives a "deep bite". Treatment is similar to that for the Class II Division 1 condition.

Malocclusions like this occur in about 18% of cases.

Class III malocclusion

A Class III malocclusion occurs when the lower teeth are in front of the uppers (a reverse overjet). There is often an associated jaw misalignment as well. These patients often need a combination of braces and a jaw surgery.

Because the lower jaw is one of the last bones to stop growing, treatment of Class III malocclusions is often delayed until the patients are adults, so that a correct treatment plan can be made.

Only about 2% of malocclusions belong to this class.