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Fig.2 (sagitttal section) shows that the bone height at the site of #31 is shorter than that of #30. There is a 1 mm separation from the Inferior Alveolar Nerve (brown) if a 8 mm implant is placed at #31.
Xin Wei, DDS, PhD, MS 1st edition 08/16/2015, last revision 08/16/2015