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After extraction of the tooth #30 and curettage, the septum becomes so thin that the most coronal portion has to be removed with Rongeur and surgical fissure bur (bone height reduction). Initial osteotomy depth is ~ 4 mm from the flattened septum (Fig.1 (yellow dashed line: apical end of the osteotomy)). Red line: the Inferior Alveolar Canal.
Xin Wei, DDS, PhD, MS 1st edition 06/18/2018, last revision 06/18/2018