title: Six-mm versus 10-mm long implants in the rehabilitation of posterior edentulous jaws: a 5-year follow-up of a randomised controlled trial.
abstract: OBJECTIVE
  To compare the clinical outcome of 6-mm and 10-mm long implants in partially edentulous posterior areas.
  
  
  METHODS
  Twenty-four patients, with a partially edentulous area in the jaws with a height and width allowing the positioning of 2 to 3 adjacent 10 × 4.1 mm implants without any augmentation procedure, were randomly allocated according to a parallel group design to receive 6-mm long or 10-mm long implants. A total of 54 implants were placed (26 × 6 mm and 28 × 10 mm implants). Patients were restored 8 weeks after surgery and were followed for 5 years. Outcome measures were prosthesis and implant survival, as well as marginal bone level changes and complications.
  
  
  RESULTS
  After 5 years, 18 patients were available. One 6 mm implant failed during the healing period and its related prosthesis could not be placed. No implants were lost after loading. The 6 mm group registered 5 complications (1 mucositis, 3 prosthesis decementations and 1 chipping), while only 3 were registered in the 10 mm group (2 decementations and 1 chipping). The difference in complications between the two groups was not statistically significant (P = 0.39). Marginal bone loss at 5 years was 0.43 and 0.24 mm with the 6 mm and 10 mm groups, respectively (not statistically significant; difference between the two groups 0.19 mm; SD 0.23 mm; 95% CI -0.34;0.73; t test P = 0.42).
  
  
  CONCLUSIONS
  Implant and prosthetic survival and success rates were similar between prostheses supported by 6-mm or 10-mm long implants.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Romeo
authors.forename: Stefano
authors.initials: S
authors.lastname: Storelli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Casano
authors.forename: Massimo
authors.initials: M
authors.lastname: Scanferla
authors.forename: Daniele
authors.initials: D
authors.lastname: Botticelli
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000145:classification; D003758:Dental Implantation, Endosseous / Q000295:instrumentation / Q000379:methods; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation* / Q000601:surgery; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D013280:Stomatitis / Q000209:etiology; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants