The reason that the implant is re-deviated buccally is that the coronal portion of the palatal plate is dense (Fig.6 *) and pushes the one piece implant buccally (Fig.7) while the latter is being inserted.

What should have been done is prior to implant placement, a 3.0 tapered drill is used to remove the coronal portion of the dense palatal plate (Fig.8, as compared to Fig.6).  The implant is going to be placed in the correct trajectory to protect the weak buccal plate and gingiva (Fig.9).

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Xin Wei, DDS, PhD, MS 1st edition 03/04/2013, last revision 01/19/2018