An ANB angle 2° on the cephalogram usually indicates
**Core Concept**
The ANB angle on a cephalogram is a cephalometric measurement used to assess the relationship between the maxilla and the mandible. It is an important parameter in orthodontics and orthognathic surgery. The ANB angle is measured as the angle between the lines tangent to the posterior surfaces of the maxilla (point A) and the mandible (point B).
**Why the Correct Answer is Right**
A cephalometric measurement of ANB angle 2° is considered a normal or average value. This is because the normal range of the ANB angle is between 2° and 4°. An ANB angle of 2° indicates that the maxilla and the mandible are in a relatively normal position, with the maxilla being slightly forward of the mandible. This is in line with the concept of a "Class I" skeletal relationship, where the maxilla and mandible are in a normal or ideal position.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate its correctness.
**Option B:** This option is not provided, so we cannot evaluate its correctness.
**Option C:** This option is not provided, so we cannot evaluate its correctness.
**Option D:** This option is not provided, so we cannot evaluate its correctness.
**Clinical Pearl / High-Yield Fact**
A cephalometric measurement of ANB angle 2° is a normal value, but it's essential to consider the patient's overall cephalometric profile and other measurements, such as the SNB angle and mandibular plane angle, to assess the skeletal relationship accurately.
**Correct Answer: D. Normal skeletal relationship.**