If the ANB norm is 2 degrees and the measured value is -2 degrees, what does this suggest?

The measured value of -2 degrees in the ANB (Point A-Nasion-Point B) angle indicates a deviation from the normative value of 2 degrees. The ANB angle is a cephalometric measurement used to assess the relationship between the maxilla (upper jaw) and the mandible (lower jaw).

A positive ANB value suggests a Class II skeletal pattern, where the maxilla is positioned further forward relative to the mandible, which typically results in a convex profile. Conversely, a negative value suggests that the mandible is positioned further forward than the maxilla, indicating a Class III skeletal pattern. In this context, with the measured ANB angle at -2 degrees, it indicates that the mandible is more anteriorly positioned relative to the maxilla, aligning with the characteristics of a Class III skeletal relationship.

Thus, the understanding of ANB values allows practitioners to classify skeletal patterns accurately, and a measured value of -2 degrees directly correlates to a Class III skeletal pattern. This classification is essential in orthodontics and craniofacial assessments as it guides treatment planning and intervention strategies.