title: Retrospective clinical outcome of nanopolymorphic crystalline hydroxyapatite-coated and anodic oxidized titanium implants for 10 years.
abstract: OBJECTIVE
  Nanopolymorphic crystalline Hydroxyapatite (HA)-coated implants were different in surface property from conventional HA-coated implants subjected to previous clinical studies. The purposes of the present study were to retrospectively evaluate 10-years clinical outcome of the HA-coated implants (HA implants) with a comparison to the same system implants with anodic oxidized titanium surface (Ti implants).
  
  
  METHODS
  Cumulative survival rate (CSR) of HA or Ti implants placed in 183 patients (55±12.4 years old) over two decades was calculated with life table analysis. Differences in CSR at each interval year, sex, age, frequency of number of implant placement according to implant location and diameter were compared between both types of implants.
  
  
  RESULTS
  Total 455 HA implants and 255 Ti implants were included. CSR at upper molar site was consistently higher in HA implants than Ti implants until 8 years after placement. The values after 10 years was 89.9% or 77.7% in HA or Ti implants, respectively. There were no significant differences in overall CSR at any interval year. HA implants were more distributed at upper molar site but less at lower molar site than Ti implants. Diameter of HA implants tended to be wider than Ti implants.
  
  
  CONCLUSIONS
  Under limitation of this retrospective study, the nanopolymorphic crystalline HA-coated implants were more survived at upper molar site than anodic oxidized implants until 8 years after placement. This clinical outcome might attribute to differences in topographical and physicochemical characteristics between both types of implants.
authors.affiliation: Department of Removable Prosthodontics & Gerodontology, Tokyo Dental College, Tokyo, Japan; Implant and Tissue Engineering Dental Network-Tokyo, Tokyo, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Kato
authors.affiliation: Department of Removable Prosthodontics & Gerodontology, Tokyo Dental College, Tokyo, Japan. Electronic address: masayamada1020@gmail.com.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamada
authors.affiliation: Department of Removable Prosthodontics & Gerodontology, Tokyo Dental College, Tokyo, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Sakurai
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D003460:Crystallization; D003757:Dental Implantation / Q000379:methods / Q000401:mortality / Q000706:statistics & numerical data; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017886:Durapatite; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D049329:Nanostructures; D010084:Oxidation-Reduction; D012189:Retrospective Studies; D012737:Sex Factors; D013499:Surface Properties; D015996:Survival Rate; D013995:Time; D014025:Titanium / Q000737:chemistry; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants; D017886:Durapatite; D014025:Titanium
keywords: Anodic oxidization; Implantology; Life table analysis; Osseointegration; Prognosis