Which skeletal classification is associated with an ANB angle less than 2?

The skeletal classification associated with an ANB angle of less than 2 degrees is Class III. The ANB angle is a cephalometric measurement used to assess the anteroposterior relationship between the maxilla (upper jaw) and the mandible (lower jaw). In a Class III skeletal relationship, the mandible is positioned more anteriorly relative to the maxilla, resulting in a lower ANB angle.

A normal ANB angle for Class I typically ranges between 2 to 4 degrees, while Class II is associated with a higher ANB angle due to an increased distance of the maxilla relative to the mandible. Since Class III reflects a protrusive mandible or a retrusive maxilla, it is characterized by an ANB angle that is less than 2 degrees, indicating a more Class III skeletal relationship where the mandible is forward compared to the maxilla. This classification is fundamental in orthodontics and helps guide treatment planning.