It appears that the bone graft particulates stick to each other (fuse) and bind to seemingly denuded the mesial surface of the mesial root (R) of the tooth #32 under the influence of rhPDGF-BB.  The periodontal space is expected to form (Fig.3s (sagittal section)).

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Xin Wei, DDS, PhD, MS 1st edition 03/18/2020, last revision 03/31/2020