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After removing the residual root at #20, no antibiotic will be used for socket disinfection except gauze. It seems that an implant smaller than 4 mm is needed (Fig.2).
It appears safer to place 1-piece implant (Fig.3) than 2-piece one (Fig.4).
B: buccal; brown circle: Inferior Alveolar Canal.
Xin Wei, DDS, PhD, MS 1st edition 08/24/2016, last revision 08/24/2016