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Lower right mandibular third molar depicted on consecutive MRI slices from buccally to lingually. MR crown height is most appropriately measured on slice D. When MR root length would only be based on slice C, stage 3 would be allocated. In fact the tooth is in stage 4, since MR root length on slice B is slightly longer than MR crown height and the root is depicted over several slices (keeping in mind that slice thickness is 2 mm).
