Fig.3,4 are coronal sections at the site of #31. It appears that a 5.3x10 mm implant is not for the site of #31 (Fig.3). The osteotomy and implant may invade the Inferior Alveolar Nerve (orange circle).
A wider, but shorter implant should be able to avoid the nerve (Fig.4). The osteotomy and the implant should not be placed too deep (pink arrow).
Xin Wei, DDS, PhD, MS 1st edition 05/29/2015, last revision 05/29/2015