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Following extraction and use of 3.8 mm Magic Drill, a 4.5x13 mm implant is placed lower than the mesial crest (Fig.3) to reduce the chance of the distal implant thread exposure. The latter is a measure to decrease peri-implantitis.
Xin Wei, DDS, PhD, MS 1st edition 09/20/2016, last revision 12/12/2018