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If he chooses extraction and implant, the latter can be 18 mm (bone-level (11 (septum, purple in color)+7 (apical, green) mm), Fig.2). If the implant perforates the septum, it will achieve primary stability in the apical bone (the first of 3 fixation points). There is ~5 mm clearance (brown) from the Inferior Alveolar Canal (red dashed line). The cuff of the restorative abutment will be most likely 3 mm (pink), while the abutment is estimated to be 4 mm long (blue). The initial osteotomy depth will be 16 mm.
Xin Wei, DDS, PhD, MS 1st edition 03/02/2017, last revision 03/02/2017