A 4.5x7(5) mm abutment is placed  mainly to correct the trajectory of the implant to certain degree.  Placement of the implant at #3 is quite smooth (Fig.5) in spite of severe bone loss and abundant granulation tissue at #3 and 5. 

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Xin Wei, DDS, PhD, MS 1st edition 06/24/2021, last revision 06/25/2021