title: Influence of implant geometry and surface characteristics on progressive osseointegration.
abstract: OBJECTIVE
  Although no currently available technique for the measurement of osseointegration is entirely satisfactory, 3 clinical variables can be reasonably associated with the process: probing depth, micromobility, and crestal bone height. Micromobility can be quantified to some extent with the use of the Periotest, a commercially available instrument In this investigation, the influence of surface characteristics and geometry upon Periotest value (PTV) and probing depth measurements was studied.
  
  
  METHODS
  In a multicenter trial, 120 healthy edentulous patients received 5 or 6 implants in the anterior mandible and were followed for 3 years. A total of 634 implants were placed. Every patient received at least 1 implant of each of 3 types: threaded titanium plasma-sprayed (TPS), threaded hydroxyapatite-coated (HA), and cylindric HA-coated. A randomization schedule assured that approximately equal numbers of each type of implant were placed and that they were uniformly distributed over the arch.
  
  
  RESULTS
  Of the 4 tested combinations of dependent and independent variables, the only statistically significant (P < .05) effect was that of coating on PTV. At 1 year after prosthetic restoration, the mean PTV for HA-coated threaded implants was -5.36 +/- 1.24, compared with -4.86 +/- 1.70 for TPS implants. This difference steadily declined in magnitude and significance, until, after 3 years, the groups were indistinguishable.
  
  
  CONCLUSIONS
  This study agrees with the previous observations that HA coating tends to accelerate the initial rate of osseointegration. The absence of a difference between threaded and cylindric implants confirms that the PTV responds to micromobility near the surface, on a scale much smaller than such gross geometric features.
  
  
  CONCLUSIONS
  On the basis of these results, one may conclude that HA-coated implants exhibit a more rapid decrease in micromobility than do TPS implants of identical geometry.
authors.affiliation: Department of Periodontology, University of Alabama (UAB) School of Dentistry, Birmingham, Alabama 35294-0007, USA. ngeurs@uab.edu
authors.forename: Nico C
authors.initials: NC
authors.lastname: Geurs
authors.forename: Robert L
authors.initials: RL
authors.lastname: Jeffcoat
authors.forename: Edwin A
authors.initials: EA
authors.lastname: McGlumphy
authors.forename: Michael S
authors.initials: MS
authors.lastname: Reddy
authors.forename: Marjorie K
authors.initials: MK
authors.lastname: Jeffcoat
mesh_terms: D020099:Coated Materials, Biocompatible; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D017886:Durapatite; D006801:Humans; D008334:Mandible; D015999:Multivariate Analysis; D016348:Osseointegration; D018709:Statistics, Nonparametric; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D017886:Durapatite