title: Survival and patient satisfaction of short implants during the first 2 years of function: a retrospective cohort study with 694 implants in 416 patients.
abstract: OBJECTIVE
  The present study aimed to evaluate the influence of implant length on implant survival and patient satisfaction during the first 24 months in function.
  
  
  METHODS
  A retrospective cohort of 312 "short" Straumann(®) SLActive(®) implants (length ≤ 8 mm) in 224 patients, which were inserted between 2008 and 2010 in private practice, were evaluated. The mean observation period was 26.7 ± 9.7 months. Three hundred and eighty-two Straumann SLActive(®) implants in 192 patients with a length ≥ 12 mm served as control group. The mean observation period in the control group was 28.3 ± 10.1 months. Implant survival rate, crown-to-implant ratio, resonance frequency analysis, and patient satisfaction were evaluated.
  
  
  RESULTS
  Implant survival rate was 99% in the test vs. 98.7% in the control group. The crown-to-implant ratio was significantly higher in the control group (P < 0.0001). Resonance frequency analysis showed slightly higher values for the short implants. There was a tendency to higher satisfaction (Oral Health Impact Profile [OHIP]) in the test group without statistical significant differences but a high overall satisfaction in both groups.
  
  
  CONCLUSIONS
  Within the limits of the present investigation, implant length had no significant influence on implant survival during the first 24 months of function of the specific implant system with hydrophilic surface (SLActive(®) ). Further follow-up studies are required to evaluate long-term results of the reduced implant length.
authors.affiliation: Privat Practice, Zwickau, Germany.|Department of Oral and Maxillofacial Surgery (Director: Prof. Dr. Dr. Dr. h.c. Friedrich Wilhelm Neukam), University Hospital Erlangen, Friedrich Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Hentschel
authors.affiliation: Privat Practice, Zwickau, Germany.|Department of Oral and Maxillofacial Surgery (Director: Prof. Dr. Dr. Dr. h.c. Friedrich Wilhelm Neukam), University Hospital Erlangen, Friedrich Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Herrmann
authors.affiliation: Faculty of Medicine Carl Gustav Carus, Institute for Medical Informatics and Biometry (IMB), Technische Universität Dresden, Dresden, Germany.
authors.forename: Ingmar
authors.initials: I
authors.lastname: Glauche
authors.affiliation: Straumann GmbH, Freiburg, Germany.
authors.forename: Armin
authors.initials: A
authors.lastname: Vollmer
authors.affiliation: Department of Oral and Maxillofacial Surgery (Director: Prof. Dr. Dr. Dr. h.c. Friedrich Wilhelm Neukam), University Hospital Erlangen, Friedrich Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: Karl Andreas
authors.initials: KA
authors.lastname: Schlegel
authors.affiliation: Department of Oral and Maxillofacial Surgery (Director: Prof. Dr. Dr. Dr. h.c. Friedrich Wilhelm Neukam), University Hospital Erlangen, Friedrich Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: Rainer
authors.identifier: http://orcid.org/0000-0003-0199-9437
authors.initials: R
authors.lastname: Lutz
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D006801:Humans; D017060:Patient Satisfaction; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: bone implant interactions; clinical assessment; clinical research; clinical trials; diagnosis