With the 2nd redirection (Fig.6 (4.5 mm tap, mesial crest (<) much lower than the distal one)), a 4.5x12 mm implant is placed with 50 Ncm; bone graft is placed with emphasis on the palatal defect (Fig.7 *).  As usual, an immediate provisional is fabricated.   In fact the abutment may be not completely seated because of contact with the mesial crest (<).  After 5.5 mm profile drill 11 months postop, the abutment has no contact with the mesial crest (Fig.8 <).