ANB in Class II:
- A- increase.
- B- decrease.
- C- same ANB is angle between SNA and SNB.
In Class II malocclusion, the ANB angle is increased compared to the normal range seen in Class I.
Here's a breakdown of the options:
A. Increase:
This is the correct answer. In Class II, the maxilla (upper jaw) is positioned forward compared to the mandible (lower jaw), leading to an increased ANB angle.
B. Decrease:
This is incorrect. A decrease in ANB indicates a Class I or Class III skeletal pattern, not Class II.
C. Same ANB is angle between SNA and SNB:
This is partially correct. The ANB angle is the angle between the SNA (sella-nasion-A point) and SNB (sella-nasion-B point) lines on a cephalometric radiograph. However, the statement doesn't consider the specific range of ANB values for different skeletal patterns.
summary:
So, to summarize:
- In Class II malocclusion, the ANB angle is increased compared to the normal range seen in Class I.
- The normal range for ANB in adults is typically considered to be 0° to 4°.
- ANB is a valuable indicator of the anteroposterior relationship between the maxilla and mandible.
