Cephalometric Analysis and Radiographic Interpretation Flashcards
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What is the normal value for the SNA angle in cephalometric analysis?
Answer: 82°
The normal SNA angle is 82° (±2°), representing the anteroposterior position of the maxilla relative to the cranial base.
Which cephalometric landmark is defined as the most posterior-superior point of the pituitary fossa?
Answer: Sella
Sella (S) is located at the center of the sella turcica and serves as the origin of the sella-nasion reference line.
The Frankfort Horizontal plane is constructed between which two cephalometric landmarks?
Answer: Porion to Orbitale
The Frankfort Horizontal is drawn from Porion (superior border of external auditory meatus) to Orbitale (lowest point of the orbital rim).
Which cephalometric analysis first introduced the concept of measuring facial convexity angle to evaluate the skeletal profile?
Answer: Downs analysis
Downs analysis (1948) introduced the facial convexity angle, measuring the convexity of the face from Nasion-A point-Pogonion.
In standard cephalometric analysis, the mandibular plane is most commonly constructed from which landmarks?
Answer: Gonion to Menton
The mandibular plane is typically drawn from Gonion (Go) to Menton (Me), representing the inferior border of the mandible.
What is the normal range for the FMA (Frankfort-Mandibular Plane Angle) in Tweed's analysis?
Answer: 25–30°
The normal FMA in Tweed's analysis is approximately 25° (±5°), with 25–30° representing a normal vertical skeletal pattern.
An ANB angle of +6° in a patient most likely indicates which skeletal classification?
Answer: Class II skeletal relationship
An ANB angle greater than +4° indicates a Class II skeletal discrepancy, with the maxilla positioned anteriorly relative to the mandible.