A 4.5x7 mm implant is placed at #31 with >50 Ncm due to the dense bone (Fig.1).  The mesiodistal space is so small that a small abutment has to be used (4.5x4(3) mm).

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Xin Wei, DDS, PhD, MS 1st edition 12/17/2019, last revision 02/14/2020