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I thought two ABO sample cases were good examples of when “the math was right” but my interpretation was wrong. They are from the Sample Case Part II PPT.
Sample Case Part II – Sample Case #6 and Sample Case #10.
Sample Case 6, Question 1 : SNA 90, SNB 80, SN-MP 42, MPA 34 “Identify the skeletal findings”
They listed protrusive maxilla and retrusive mandible. I put protrusive maxilla only and did not include retrusive mandible. SN-FH was 8, so that’s right around normal so I didn’t make any adjustments.
Sample Case 10, Question 1: SNA 87, SNB 80, SN-MP 14, MP 8 “Identify the skeletal abnormalities”
They listed retrusive mandible. I had put protrusive maxilla, which wasn’t an answer on this case. I figured since SN-FH was 6, you could maybe subtract a degree or two from SNA and SNB, but then that would give SNA 85 and SNB 78. Visually, the mandible looked retrusive to me, but I got a little caught up in the numbers I think.
Are these interpretations affected by the fact that the patient in Sample Case 6 has a steep MPA, and the patient in Sample Case 10 has a low MPA? Thanks again!