title: Randomized controlled multicentre study comparing short dental implants (6 mm) versus longer dental implants (11-15 mm) in combination with sinus floor elevation procedures. Part 1: demographics and patient-reported outcomes at 1 year of loading.
abstract: OBJECTIVE
  To test whether or not the use of short dental implants (6 mm) results in an implant survival rate similar to long implants (11-15 mm) in combination with sinus grafting.
  
  
  METHODS
  This multicentre study enrolled 101 patients with a posterior maxillary bone height of 5-7 mm. Patients randomly received short implants (6 mm) (group short) or long implants (11-15 mm) with sinus grafting (group graft). Six months later, implants were loaded with single crowns and patients re-examined at 1 year of loading. Outcomes included treatment time, price calculations, safety, patient-reported outcome measures (OHIP-49 = Oral Health Impact Profile) and implant survival. Statistical analysis was performed using a non-parametric approach.
  
  
  RESULTS
  In 101 patients, 137 implants were placed. Mean surgical time was 52.6 min. (group short) and 74.6 min. (group graft). Mean costs amounted to 941EUR (group short) and 1946EUR (group graft). Mean severity scores between suture removal and baseline revealed a statistically significant decrease for most OHIP dimensions in group graft only. At 1 year, 97 patients with 132 implants were re-examined. The implant survival rate was 100%.
  
  
  CONCLUSIONS
  Both treatment modalities can be considered suitable for implant therapy in the atrophied posterior maxilla. Short implants may be more favourable regarding short-term patient morbidity, treatment time and price.
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.forename: Robert
authors.initials: R
authors.lastname: Haas
authors.forename: Marcin
authors.initials: M
authors.lastname: Tutak
authors.forename: Abel
authors.initials: A
authors.lastname: Garcia
authors.forename: Gian Pietro
authors.initials: GP
authors.lastname: Schincaglia
authors.forename: Christoph H F
authors.initials: CH
authors.lastname: Hämmerle
mesh_terms: D000328:Adult; D000368:Aged; D001294:Attitude to Health; D003365:Costs and Cost Analysis; D003442:Crowns / Q000191:economics / Q000523:psychology; D003758:Dental Implantation, Endosseous / Q000191:economics / Q000379:methods; D019250:Dental Implants, Single-Tooth / Q000191:economics / Q000523:psychology; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported / Q000191:economics / Q000523:psychology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D061646:Operative Time; D009909:Oral Health; D017060:Patient Satisfaction; D011446:Prospective Studies; D011788:Quality of Life; D012449:Safety; D059546:Sinus Floor Augmentation / Q000191:economics / Q000379:methods*; D016019:Survival Analysis; D016896:Treatment Outcome; D055815:Young Adult
keywords: OHIP; OHIP-49; bone augmentation; dental implant; multicentre; patient satisfaction; quality of life; randomized controlled clinical trial; short dental implant; sinus floor elevation; sinus grafting