What does an SNB value of 85 degrees signify when the normal value is 80 degrees?

An SNB angle of 85 degrees indicates that the mandible is positioned more anteriorly or is prognathic compared to the normative value of 80 degrees. In cephalometric analysis, the SNB angle assesses the relationship between the maxilla and the mandible. A higher SNB angle signifies that the mandible has a forward positioning relative to the skull base, which is characteristic of a prognathic profile.

This information is crucial for orthodontic diagnosis and treatment planning, as it helps determine the relationship between the upper and lower jaws, which can influence facial aesthetics and functional occlusion. Understanding this aspect of skeletal relationships enables practitioners to make informed decisions regarding orthodontic appliances or surgical interventions that may be necessary for balancing occlusion or improving facial harmony.