Influence of a machined collar on crestal bone changes around titanium implants: a histometric study in the canine mandible

Hermann, Joachim S; Jones, Archie A; Bakaeen, Lara G; Buser, Daniel; Schoolfield, John D; Cochran, David L (2011). Influence of a machined collar on crestal bone changes around titanium implants: a histometric study in the canine mandible. Journal of periodontology, 82(9), pp. 1329-38. Chicago, Ill.: American Academy of Periodontology 10.1902/jop.2011.090728

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It has been shown that peri-implant crestal bone reactions are influenced by both a rough-smooth implant border in one-piece, non-submerged, as well as an interface (microgap [MG] between implant/abutment) in two-piece butt-joint, submerged and non-submerged implants being placed at different levels in relation to the crest of the bone. According to standard surgical procedures, the rough-smooth implant border for implants with a smooth collar should be aligned with the crest of the bone exhibiting a smooth collar adjacent to peri-implant soft tissues. No data, however, are available for implants exhibiting a sandblasted, large-grit and acid-etched (SLA) surface all the way to the top of a non-submerged implant. Thus, the purpose of this study is to histometrically examine crestal bone changes around machined versus SLA-surfaced implant collars in a side-by-side comparison.

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