The classification of bites is divided into three main categories: Class I, II, and III. This classification refers to the position of the first molars, and how they fit together.
Class I
Class I is a normal relationship between the upper teeth and lower teeth and jaws, or balanced bite.
Normal
Class I Crowding
Class I Spacing
Class II
Class II is where the lower first molar is posterior (or more towards the back of the mouth) to the upper first molar. In this abnormal relationship, the upper front teeth project further forward than the lower teeth. Class II problems can be due to insufficient growth of the lower jaw, an over growth of the upper jaw, or a combination of the two. In many cases, Class II problems are genetically inherited.
Class II Division I
Class II Division II
Class III
Class III is where the lower first molar is anterior (or more towards the front of the mouth) to the upper first molar. In this abnormal relationship, the lower teeth project further forward than the upper teeth. There is a concave appearance in profile with a prominent chin. Class III problems are usually due to an overgrowth in the lower jaw, an undergrowth of the upper jaw, or a combination of the two.
