Radiology · single question
On a lateral cephalometric radiograph, the MANDIBULAR PLANE is constructed between which landmarks?
Show answer and explanation
Correct answer: D. Gonion (Go) and Menton (Me)
- A. Incorrect. Porion to Orbitale defines the FRANKFORT HORIZONTAL PLANE — not the mandibular plane.
- B. Incorrect. Nasion to Point A (A-N line) is used for measuring the position of the maxilla.
- C. Incorrect. Sella to Nasion (SN line) is the cranial base reference line.
- D. Correct. The MANDIBULAR PLANE is defined by connecting GONION (Go — the most inferior posterior point of the angle of the mandible) to MENTON (Me — the most inferior point of the chin/symphysis). This line represents the angle and inclination of the mandibular body and is used in cephalometric analysis.