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Cusp tip attrition. This would have to be present to represent the maximum difference in additional variability between roots only and whole tooth in the repeated measures. (A) Normal 3D volume. (B) 3D volume representing maximum difference in additional variability of the roots versus the whole tooth (64.79 mm3 − 30.39 mm3 = 34.40 mm3) in the repeated measures removed from cusp tips.
