An ANB angle of 2 degrees on the cephalogram usually indicates:

 # An ANB angle of 2 degrees on the cephalogram usually indicates:

A. An unfavorable relationship of mandible to maxilla

B. A favorable relationship of maxillary alveolar base to mandibular alveolar base

C. Poor cranial growth with poor prognosis

D. Retruded maxillary incisor

The correct answer is B. A favorable relationship of maxillary alveolar base to mandibular alveolar base.

SNA angle relates the maxilla to the cranial base. The mean value is 82°. A larger value indicates a prognathic maxilla while a smaller value suggests a retrognathic maxilla. SNB angle relates the mandible to the cranial base. Its average value is 80°. Larger values indicate a prognathic mandible while smaller values indicate a retrusive mandible. ANB angle denotes the relative position of the maxilla and mandible to each other. The mean value is 2°. An increase in this angle indicates class-II skeletal tendency while an angle that is less than normal or a negative angle suggests a skeletal class-III relationship.