title: Effect of surface modifications on early bone healing around plateau root form implants: an experimental study in rabbits.
abstract: OBJECTIVE
  The objective of the present study was to evaluate the biomechanical fixation and bone-to-implant contact (BIC) of plateau root form implants of varied surfaces.
  
  
  METHODS
  Plateau root form implants, 3.5 mm in diameter, 8 mm in length, with 4 surfaces (n = 16 each)--machined, alumina-blasted/acid-etched, alumina-blasted/acid-etched plus nanothickness bioceramic coating, and plasma-sprayed calcium-phosphate--were used. They were bilaterally placed at the distal femur of 16 New Zealand rabbits and remained in place for 2 and 4 weeks in vivo. After euthanizing the rabbits, the implants were subjected to torque to interface fracture and were subsequently processed as nondecalcified approximately 30-microm-thickness slides for histomorphologic analysis and BIC determination. Statistical analysis was performed using analysis of variance at the 95% level of significance, considering implantation time and implant surface as independent variables and the torque-to-interface fracture and BIC as dependent variables.
  
  
  RESULTS
  The torque-to-interface fracture was significantly affected by the implant surface (P < .001) but was not affected by the implantation time (P > .20). The implantation time and implant surface had significant effects on the BIC (P < .04 and P < .001, respectively). The greatest torque-to-interface fracture and BIC was observed for the plasma-sprayed calcium-phosphate.
  
  
  CONCLUSIONS
  The implant surface significantly influenced early bone healing around plateau root form implants.
authors.affiliation: Department of Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Suzuki
authors.forename: Monica D
authors.initials: MD
authors.lastname: Calasans-Maia
authors.forename: Charles
authors.initials: C
authors.lastname: Marin
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Granato
authors.forename: Jose N
authors.initials: JN
authors.lastname: Gil
authors.forename: Jose M
authors.initials: JM
authors.lastname: Granjeiro
authors.forename: Paulo G
authors.initials: PG
authors.lastname: Coelho
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D003758:Dental Implantation, Endosseous / Q000295:instrumentation*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D005269:Femur / Q000601:surgery; D016348:Osseointegration; D011817:Rabbits; D013314:Stress, Mechanical; D013499:Surface Properties; D019415:Torque
chemical_list: D015921:Dental Implants