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Fig. 8 (preop CBCT sagittal section): The coronal distal threads of the tissue-level implant at the site of #19 (between arrowheads) are exposed to the mesial socket of the tooth #18 and covered by bone graft (red circle). The rest of the sockets (including the distal) is filled with collagen plug or membrane.
Xin Wei, DDS, PhD, MS 1st edition 05/07/2015, last revision 05/09/2015