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ABO sample case 1; Case 1
For the sample case 1:
The question states to identify the dental changes that occurred in 22 months of tx (almost 2 years).
This was my answer that I came up with. I was confused by their assessment about L6 and L1.
U6s: moved mesially more than expected; therefore due to tx. The U6 should extruded about 2.4 mm; it looks a bit more than that. I would say that its extrusion was a combination of tx and growth related.
U1s: retroclined due to tx and held vertically due to tx
L6s: Erupted and extruded due to normal growth. We expect it to extrude about 1.8 mm and move mesially about 1 mm.
L1s: I feel like the L1s were held in the AP and extruded less than expected— all treatment related.
I’m confused by their answer: “L6s and L1s were held vertically.”
Thanks!
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8 Replies
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https://www.americanboardortho.com/media/0bhjmyib/202309_samplecases1withanswers-sampcases1.pdf
Posting the Link to the sample case you are referring to. Looks like this was updated in Sept 2023.
I agree with you. The L6s look like normal growth. L1s were held in the vertical.
I can’t explain why they suggest the L6s were held because my math adds up just like yours.
Anyone else have thoughts?
Carter
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The arbitrary nature of the superimposition questions is frustrating. A grid overlay would be nice, lol. Even the Buschang article examples are not to scale.
If we use the ave heights of molar crowns and incisors to be 7mm and 9mm respectively, the lower molar erupted at least 2mm in 22 mos. I would not call that held vertically.
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I concur. But this is the whole art in the midst of our science.
Keep cool. Remember you’re just having a conversation with a couple other orthodontists and communicating with them about a case using a bulleted lists. If something on the exam looks iffy to you then a chance is it looks iffy to the other ortho geniuses as well.
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🙏
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For the L1s I see a slight extrusion. If you trace the incisal edge pre and post, it seems it extruded very minor.
Am I wrong?
Thanks!
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See Chi’s reply below
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My two cents here…I’m thinking that they might be referring to mandibular molars and incisors were held vertically because from normal growth and not from treatment effect. And the question asked for dental changes from treatment.
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Exactly! Well assessed. When there is less than expected growth that means it was a treatment effect.
Keep it up-
Carter
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