title: A comparison of hydroxyapatite (HA) -coated threaded, HA-coated cylindric, and titanium threaded endosseous dental implants.
abstract: OBJECTIVE
  The purpose of this study was to compare the success of hydroxyapatite (HA) -coated and machined titanium (Ti) implants in a 5-year randomized, controlled clinical trial conducted at 2 centers.
  
  
  METHODS
  Each of 120 edentulous patients received HA-coated threaded, HA-coated cylindric, and machined Ti threaded implants in a randomized design using 5 or 6 implants. Digital radiographs allowed for yearly measurements of bone loss. Calibrated clinicians also measured mobility, Gingival Index, Plaque Index, probing depth, and recession. A Kaplan-Meier analysis was used to compare the proportion of ailing implants (defined as less than 2 mm of alveolar bone loss over 5 years) for each type of implant design. The criteria employed to assess implant outcome included the need for successful implants to lose less than 2 mm of bone support over the 5 years following placement of the prosthesis.
  
  
  RESULTS
  This analysis revealed that 95.2% of machined Ti threaded implants and 97.92% of HA-coated threaded implants were successful, while 99.0% of HA-coated cylindric implants experienced less than 2 mm of bone loss (P < .06).
  
  
  CONCLUSIONS
  All types of implants placed in this study had success rates above 95%.
  
  
  CONCLUSIONS
  Over 5 years, the success rate tended to favor HA-coated implants.
authors.affiliation: Department of Periodontology, University of Alabama School of Dentistry, Birmingham, Alabama 35294-0007, USA. jeffcoat@uab.edu
authors.forename: Marjorie K
authors.initials: MK
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: Nico C
authors.initials: NC
authors.lastname: Geurs
authors.forename: Howard M
authors.initials: HM
authors.lastname: Proskin
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000145:classification; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry*; D003774:Dental Plaque Index; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D017886:Durapatite / Q000737:chemistry*; D005500:Follow-Up Studies; D005889:Gingival Recession / Q000145:classification; D006801:Humans; D008875:Middle Aged; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000145:classification; D016037:Single-Blind Method; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D014025:Titanium / Q000737:chemistry*; D016896:Treatment Outcome
chemical_list: D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D003764:Dental Materials; D017886:Durapatite; D014025:Titanium