The empty socket of the tooth #4 is wide buccopalatal (Fig.10 B, P); the buccal plate is resorbed coronally (Fig.10 <) so that a 4.5 or 5 mm in diameter implant should be placed palatal (Fig.11).  Use sticky bone to repair the buccal plate defect.

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Xin Wei, DDS, PhD, MS 1st edition 05/25/2019, last revision 05/25/2019