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Initial osteotomy at the site of #31 using 2 mm pilot drill for 11 mm appears to be distal by 2-3 mm (Fig.1). Yellow dashed line: healed socket outline; red dashed line: the superior border of the Inferior Alveolar Canal.
Bone density seems to be low. Bone expansion and bending is indicated.
Xin Wei, DDS, PhD, MS 1st edition 12/12/2016, last revision 12/12/2016