title: Randomized controlled multicenter study comparing short dental implants (6 mm) versus longer dental implants (11-15 mm) in combination with sinus floor elevation procedures. Part 2: clinical and radiographic outcomes at 1 year of loading.
abstract: OBJECTIVE
  To compare, clinically and radiographically, short dental implants (6 mm) to long implants (11-15 mm) placed with sinus grafting.
  
  
  METHODS
  Participants with 5-7 mm of bone height in the posterior maxilla were randomly allocated to receive short implants (GS) or long implants with sinus grafting (GG). Implants were loaded with single crowns 6 months after placement (PR). Patients were re-evaluated 12 months after loading (FU-1). Outcome variables included: Implant survival rate (CSR), marginal bone level alteration (MBL), periodontal probing depth (PPD), bleeding on probing (BoP), plaque control record (PCR) and crown-to-implant ratios (C/I). Statistical analysis was performed using parametric tests.
  
  
  RESULTS
  In 97 subjects, 132 implants were re-evaluated at FU-1. The CSR was 100%. The MBL from implant placement (IP) to (PR) was -0.22 ± 0.4 mm for GG and -0.3 ± 0.45 mm for GS (p < 0.001). MBL from IP to FU-1 was -0.37 ± 0.59 mm for GG and -0.22 ± 0.3 mm for GS (p < 0.001). Intergroup comparisons showed non-significant differences for MBL (p > 0.05), PPD (p = 1) and PCR (p = 0.09). BoP was higher in the GS (p = 0.04). The C/I was 0.99 ± 0.17 for GG and 1.86 ± 0.23 for GS (p < 0.001). No correlation was observed between C/I and MBL, (GG: p = 0.13; GS: p = 0.38).
  
  
  CONCLUSIONS
  Both treatment modalities provided similar outcomes.
authors.affiliation: School of Dentistry Universita' di Ferrara, Ferrara, Italy.
authors.forename: Gian Pietro
authors.initials: GP
authors.lastname: Schincaglia
authors.affiliation: Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Daniel S
authors.initials: DS
authors.lastname: Thoma
authors.affiliation: Akademie für Orale Implantologie, Private Practice, Vienna, Austria.
authors.forename: Robert
authors.initials: R
authors.lastname: Haas
authors.affiliation: Aesthetic Dent, Private Practice, Szczecin, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Tutak
authors.affiliation: University of Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: Abel
authors.initials: A
authors.lastname: Garcia
authors.affiliation: Division of Prosthodontics, School of Dental Medicine, University of Connecticut, Farmington, CT, USA.
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Taylor
authors.affiliation: Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Christoph H F
authors.initials: CH
authors.lastname: Hämmerle
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D059546:Sinus Floor Augmentation; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: bone augmentation; dental implant; multicentre; randomized controlled clinical trial; short dental implant; sinus floor elevation; sinus grafting