Limited Bone Height with Indistinct Inferior Alveolar Canal

A 45-year-old man has lost the tooth #31 for several years.  The Inferior Alveolar Canal is indistinct (Fig.1,2).  Although the bone height is more than 10 mm, the initial osteotomy depth is 8 mm.  It is also easy to change trajectory with short osteotomy.  Use 4 mm implant spacer to position the starter drill. 

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Xin Wei, DDS, PhD, MS 1st edition 09/26/2015, last revision 11/21/2018