Answer
You should have found that the upper left incisor was the most prominent incisor. This is in the 4 zone and the answer is therefore 4a.
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Index of Orthodontic Treatment Need
You should have found that the upper left incisor was the most prominent incisor. This is in the 4 zone and the answer is therefore 4a.
Click on the red "ruler" button to go back to the beginning.