title: Impact of abutment microstructure and insertion depth on crestal bone changes at nonsubmerged titanium implants with platform switch.
abstract: OBJECTIVE
  To assess the impact of microgrooved abutments and the insertion depth on crestal bone changes at titanium implants with platform switch.
  
  
  METHODS
  A total of n = 3 titanium implants (conical abutment connection) were inserted in each hemimandible of n = 6 foxhounds with the implant shoulder (IS) located at either epicrestal, supracrestal (+1 mm), or subcrestal (-1 mm) positions and randomly (split-mouth design) connected with machined or partially microgrooved healing abutments. At 20 weeks, tissue biopsies were processed for histological (primary outcome: net bone loss - NET) analyses.
  
  
  RESULTS
  Subcrestal positioning of IS tended to be associated with higher mean NET values (mm) at both machined (subcrestal [-0.72 ± 0.32] > epicrestal [-0.34 ± 0.21] > supracrestal [+0.20 ± 0.64]) and microgrooved (subcrestal [-0.48 ± 0.25] > epicrestal [-0.13 ± 0.54] > supracrestal [+0.33 ± 0.58]) abutments. However, these differences failed to reach statistical significance.
  
  
  CONCLUSIONS
  The insertion depth may have a direct influence on crestal bone-level changes at both types of abutments investigated.
authors.affiliation: Department of Oral Surgery, Heinrich Heine University, Düsseldorf, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Schwarz
authors.forename: Ilja
authors.initials: I
authors.lastname: Mihatovic
authors.forename: Vladimir
authors.initials: V
authors.lastname: Golubovich
authors.forename: Alex
authors.initials: A
authors.lastname: Schär
authors.forename: Martin
authors.initials: M
authors.lastname: Sager
authors.forename: Jürgen
authors.initials: J
authors.lastname: Becker
mesh_terms: D016301:Alveolar Bone Loss / Q000473:pathology; D000818:Animals; D000044:Dental Abutments; D059605:Dental Implant-Abutment Design; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D004285:Dogs; D013499:Surface Properties; D014025:Titanium
chemical_list: D015921:Dental Implants; D014025:Titanium
keywords: animal study; histomorphometry; insertion depth; titanium implant