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Placing a two-piece implant at the narrow ridge of the sites of #18 is quite challenging (Fig.4), as compared that at #31 (Fig.5).
It appears safer to place a 1-piece implant (Fig.3) than the 2-piece one.
B: buccal; brown circle: Inferior Alveolar Canal.
Xin Wei, DDS, PhD, MS 1st edition 08/24/2016, last revision 08/24/2016