The osteotomy (Fig.2 O) is initiated as lingual as possible so that there is enough room to repair the buccal defect.  As known, the mental loop exits buccal.  Lingual implant placement is safe.  Initial osteotomy depth check shows new bone at least 5 mm (Fig.3 with insertion of a parallel pin with 6 mm mark), while there is about 2 mm separation from the mental loop vertically (red dashed line).   There should be more separation of the apical osteotomy from the Mental Loop buccolingually.  As the osteotomy increases in diameter, it tends to shift buccally.  With guided surgery, the osteotomy would remain lingual most likely. C: crest.

Immediate Implant in Hard Bone Last Next Xin Wei, DDS, PhD, MS 1st edition 09/03/2015, last revision 01/26/2019