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Since the lingual portion of the osteotomy is higher, it is difficult to use drill with stopper. For the narrow septum osteotomy, multiple drills are used sequentially (Fig.5 after 4.3 mm drill). Note the bone plug in the apical end of the osteotomy.
Xin Wei, DDS, PhD, MS 1st edition 10/20/2016, last revision 08/01/2018