title: Titanium-zirconium narrow-diameter versus titanium regular-diameter implants for anterior and premolar single crowns: 1-year results of a randomized controlled clinical study.
abstract: OBJECTIVE
  To test whether titanium-zirconium (TiZr) 3.3 mm diameter implants perform differently from titanium (Ti) 4.1 mm diameter implants with respect to marginal bone level (MBL) and clinical parameters.
  
  
  METHODS
  Forty subjects in need of a single implant-supported crown in the anterior or premolar regions were recruited in two centres. After random allocation, either a Ti or a TiZr implant was placed. Definitive crowns were inserted 6 months after implant placement. Implant survival, change in MBL, clinical parameters and occurrence of adverse events were assessed at the 1-year examination.
  
  
  RESULTS
  At 1 year, 38 of the 40 included patients were examined (18 Ti and 20 TiZr implants). All the implants were in place and stable. From the implant placement to the 1-year examination, the change of MBL amounted to -0.40 mm in the Ti group and -0.41 mm in the TiZr group. There were no significant differences between the groups regarding the change in MBL, the clinical parameters and the occurrence of adverse events.
  
  
  CONCLUSIONS
  The use of TiZr implants with narrow diameter for the support of single crowns in the anterior and premolar regions leads to successful tissue integration and clinical performance over a 1-year period.
authors.affiliation: Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Goran I
authors.initials: GI
authors.lastname: Benic
authors.forename: German O
authors.initials: GO
authors.lastname: Gallucci
authors.forename: Muizzaddin
authors.initials: M
authors.lastname: Mokti
authors.forename: Christoph H F
authors.initials: CH
authors.lastname: Hämmerle
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Weber
authors.forename: Ronald E
authors.initials: RE
authors.lastname: Jung
mesh_terms: D020341:Absorbable Implants; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001641:Bicuspid; D018786:Bone Substitutes / Q000627:therapeutic use; D003442:Crowns; D003481:Cuspid; D059605:Dental Implant-Abutment Design; D019250:Dental Implants, Single-Tooth / Q000009:adverse effects; D003764:Dental Materials / Q000737:chemistry*; D003774:Dental Plaque Index; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor; D008297:Male; D008567:Membranes, Artificial; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D010512:Periodontal Index; D011446:Prospective Studies; D014025:Titanium / Q000737:chemistry*; D016896:Treatment Outcome; D055815:Young Adult; D015040:Zirconium / Q000737:chemistry*
chemical_list: D018786:Bone Substitutes; D003764:Dental Materials; D008567:Membranes, Artificial; D015040:Zirconium; D014025:Titanium
keywords: crown; dental implants; diameter; fixed partial denture; humans; narrow; radiographic; randomized controlled trial; survival; titanium; titanium-zirconium