It appears that 2.5x12 mm one piece implant is an option (Fig.3, red circles: particulate graft).  The abutment of the 2.5 mm 1 piece implant is straight, whereas that of 3 mm one can be 15° (Fig.4).  When the large 1 piece implant is used, it can be placed in more or less anatomic position with risk of the labial plate perforation.  Therefore onlay (Fig.4 red lines) or particulate graft should be done as the first procedure or at the same time.

1 Piece or Onlay Graft? Last Surgery

Xin Wei, DDS, PhD, MS 1st edition 11/27/2014, last revision 08/05/2018