title: Early loading of 6-mm-short implants with a moderately rough surface supporting single crowns--a prospective 5-year cohort study.
abstract: OBJECTIVE
  To evaluate prospectively the clinical and radiographic outcomes after 5 years of early loading of 6-mm implants with a moderately rough (SLActive(®) ) surface supporting single crowns in the posterior regions.
  
  
  METHODS
  Thirty-five consecutive patients received 40 SLActive(®) (Straumann) 6-mm implants with a diameter of 4.1 mm (n = 19) or 4.8 mm (n = 21). Insertion torque and resonance frequency analysis (RFA) were measured at implant installation. RFA was also measured at abutment connection. SynOcta abutments were tightened with 35 Ncm after 6 weeks of healing, and single porcelain fuse to metal crowns was cemented within 1 week. Implant survival rate and marginal bone loss were evaluated at various time intervals until 5 years after loading. The clinical crown/implant ratio was calculated as well.
  
  
  RESULTS
  Two of 40 implants were lost before loading (incorporation rate 95%), and no further implant loss or technical complications were encountered during the 5-year follow-up period. A mean marginal bone loss of 0.7 ± 0.6 mm was found after 5 years of function. The clinical crown/implant ratio increased with time from 1.6 at the delivery of the prosthesis to 2 after 5 years of loading.
  
  
  CONCLUSIONS
  Six millimeter implants with a SLActive(®) moderately rough surface supporting single crowns in the posterior region and loaded after 6-7 weeks maintained full function for at least 5 year with low marginal bone resorption.
authors.affiliation: Unit Scholar, Department of Biomedical and Neuromotorial Science, University of Bologna, Bologna, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Rossi
authors.affiliation: University of Berne, Berne, Switzerland.|University of Zurich, Zurich, Switzerland.
authors.forename: Niklaus P
authors.initials: NP
authors.lastname: Lang
authors.affiliation: Department of Biomedical and Neuromotorial Science, University of Bologna, Bologna, Italy.
authors.forename: Emanuele
authors.initials: E
authors.lastname: Ricci
authors.affiliation: Unit Scholar, Department of Biomedical and Neuromotorial Science, University of Bologna, Bologna, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Ferraioli
authors.affiliation: Department of Biomedical and Neuromotorial Science, University of Bologna, Bologna, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Marchetti
authors.affiliation: UNESP - São Paulo State University, Faculty of Dentistry of Araçatuba (SP), Araçatuba, Brazil.|ARDEC, Ariminum Odontologica, Rimini, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: Botticelli
mesh_terms: D000328:Adult; D000368:Aged; D003442:Crowns; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D006801:Humans; D057893:Immediate Dental Implant Loading / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013499:Surface Properties; D019415:Torque; D016896:Treatment Outcome
keywords: SLActive surface; dental implants; early loading; implant length; prospective cohort; short implants