Because of supraeruption of the tooth #28 (Fig.6 arrow), a healing abutment (4x2 mm) is placed at #5 (data not shown), while a pair abutment (4.5x4(2) mm) is placed at #4.  In fact a splinted provisional is placed at #4 and 5 with a low occlusal table.

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Xin Wei, DDS, PhD, MS 1st edition 02/22/2017, last revision 09/01/2018