Depending upon the sagittal structure of jaws and teeth, the bite problem is classified into three main categories: Class I, class II and class III. These classes are discussed below:
Class I: Neutrocclusion
In this form of bite problem or bad bite, a normal molar relationship exists, but there are crossbites, crowding, and misalignment of the teeth.
Class II: Distocclusion
It is also known as retrognathism, overbite or overjet. In this case, the lower first molar is posterior than the upper first molar or the jaw and the upper front teeth projects more forward than the jaw and lower teeth. A distocclusionis further divided into two sub categories:
The case I: In this condition, the anterior teeth are protruded.
Case II: In this case,central teeth are retroclined and the lateral teeth are overlapping with the central teeth.
The distocclusion or overbite is generally caused due to the overgrowth of the upper jaw or insufficient growth of the lower jaw. The reason behind this deformation can be the genetic or certain environmental factors such as tongue thrusting and thumb sucking. To bring the lower and upper teeth in the appropriate position the overbite correction is done by bringing the lower and upper teeth in the appropriate position. The orthodontist uses growth-redirecting techniques for overbite correction.
Class III: Mesiocclusion
In mesiocclusion, the lower molar is more towards the front of the jaw as compared to the upper first molar. One can also say that lower jaw and teeth are more forward than the upper jaw and teeth. This deformation is generally caused due to the undergrowth of the upper jaw and overgrowth of the lower jaw. This bite problem creates the concave appearance of the mouth with the high up chin. It is also known as negativeoverjet, underbite, and prognathism.