CT coronal sections at the mesial root of #31 show that a 7x17 (Fig.2) or 7x14 mm (Fig.3) implant does not look too large for the alveolar bone buccolingually.  The large implant is able to help close the large socket (mesial (Fig.1,4) and buccal (B) aspects), reducing the amount of bone graft (red circles) placed.  The shorter implant (which can be placed a little deeper, Fig.3) may reduce the chance of buccal thread exposure.  L: lingual.

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Xin Wei, DDS, PhD, MS 1st edition 10/11/2014, last revision 02/17/2015