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The implant at #19 is equicrestal (Fig.6); the one at #18 is apparently supracrestal buccally (Fig.7). The crestal bone appears to present no obstacle to seating of the abutment after crestal bone resorption. The abutment should be able to be seated completely.
Xin Wei, DDS, PhD, MS 1st edition 12/14/2019, last revision 12/22/2019