When 1.2 mm drill is used for osteotomy at #14 and 15, the bone feels to be soft (Fig.1).  One of the small drills is bent during X-ray taking.  Either a broken drill bit or Bone Expander 1 should be used.

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Xin Wei, DDS, PhD, MS 1st edition 07/31/2017, last revision 06/12/2019