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The immediate implant (tissue-level) is designed to be as large as 7 mm and as long as 17 mm (Fig.3). To reduce paresthesia (yellow dashed line: the possible upper border of the Inferior Alveolar Canal)) , a shorter implant (14 mm long in red line) is preferred.
Retrospectively, a 7 mm wide implant is an overkill mesiodistally, particularly for a woman. A 14 mm long implant has approximately 9 mm contact with the septum for primary stability. There will be almost no chance to injury the Inferior Alveolar Nerve. Immediate implant appears to offer an advantage in this aspect.
Xin Wei, DDS, PhD, MS 1st edition 02/15/2015, last revision 02/16/2015