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It seems that the bone loss at #17 is associated with mild pericoronitis. The tooth #17 should be extracted with placement of Bond Apatite to repair #18 distal defect. In fact sticky bone and collagen plug are placed instead (Fig.3), covered by 2 pieces of PRF.
Xin Wei, DDS, PhD, MS 1st edition 05/28/2021, last revision 05/28/2021