An anomaly characterized by an increased SNA angle is called which?

An anomaly characterized by an increased SNA angle is called which?

• A. Mandibular retrognathia
• B. Maxillary prognathism
• C. Mandibular prognathism
• D. Bimaxillary retrognathia

Answer: (B)

The SNA angle measures how far the maxilla sits forward relative to the cranial base. An increased SNA means the maxilla is positioned more anteriorly than normal, which is called maxillary prognathism. Mandibular retrognathia relates to the mandible's position and SNB, not SNA; mandibular prognathism involves the mandible being forward (increased SNB); and bimaxillary retrognathia would show reduced values for both SNA and SNB. So the finding of a larger-than-normal SNA specifically identifies the maxilla as prognathic.

The SNA angle measures how far the maxilla sits forward relative to the cranial base. An increased SNA means the maxilla is positioned more anteriorly than normal, which is called maxillary prognathism.

Mandibular retrognathia relates to the mandible's position and SNB, not SNA; mandibular prognathism involves the mandible being forward (increased SNB); and bimaxillary retrognathia would show reduced values for both SNA and SNB. So the finding of a larger-than-normal SNA specifically identifies the maxilla as prognathic.