Due to the large periapical lesion, there will be no solid (new) bone available for primary stability of an immediate implant (Fig.2: 7x17 mm). In fact the apical diameter of 7x17 mm tapered implant is 4.5 mm; 8x17: 5 mm.  Yellow dashed line represents the upper border of the Inferior Alveolar Canal (IAC). 

The mesiodistal widths of the root of the extracted tooth are 10 and 7 mm at the coronal and apical ends, respectively; the buccolingual ones 7 and 5 mm; the length 17 mm (Fig.3). 

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Xin Wei, DDS, PhD, MS 1st edition 10/10/2014, last revision 10/10/2014