title: Fully vs. partially rough implants in maxillary sinus floor augmentation: a randomized-controlled clinical trial.
abstract: OBJECTIVE
  To compare implants with a rough surface in their whole length (FR) with implants having a 2 mm coronal machined portion (PR) when used in association with a sinus-lift procedure.
  
  
  METHODS
  Twenty-six patients with 2 mm< or =x< or =9 mm residual alveolar crest were prosthetically restored with implants after a staged sinus-lift procedure using osteotomes. In 13 randomly chosen patients, no more than one FR implant was placed (test group), while the rest were PR implants. The other 13 patients received only PR implants (control group). For comparisons, only one implant from each patient was used, i.e., from the test group only the 13 FR implants were used, while from the control group, one PR implant was randomly chosen. The presence/absence of plaque, BOP, PPD and REC were registered at the day of delivery of the restorations and after 1 year. Residual alveolar crest height and marginal bone levels around the implants were evaluated on standardized periapical radiographs taken at various stages.
  
  
  RESULTS
  Four FR and two PR implants were lost, and the cumulative survival rate was 82.9% (six lost out of 35). There were no significant differences between the two groups. Implant type, residual alveolar crest height, time of osseointegration, time of implant loading and smoking did not seem to influence implant survival.
  
  
  CONCLUSIONS
  FR and PR implants placed in augmented sinuses did not differ in their clinical performance.
authors.affiliation: Department of Periodontology and Oral Gerontology, Royal Dental College, University of Aarhus, Aarhus, Denmark. stavropoulos@odont.au.dk
authors.forename: Andreas
authors.initials: A
authors.lastname: Stavropoulos
authors.forename: Thorkild
authors.initials: T
authors.lastname: Karring
authors.forename: Lambros
authors.initials: L
authors.lastname: Kostopoulos
mesh_terms: D000539:Alveolar Process / Q000473:pathology; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D016025:Bone Transplantation / Q000379:methods; D000044:Dental Abutments; D015921:Dental Implants; D003773:Dental Plaque / Q000145:classification; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D005884:Gingival Hemorrhage / Q000145:classification; D005889:Gingival Recession / Q000145:classification; D006801:Humans; D008297:Male; D008437:Maxilla / Q000473:pathology / Q000601:surgery*; D008443:Maxillary Sinus / Q000601:surgery*; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D010027:Osteotomy / Q000379:methods; D010514:Periodontal Pocket / Q000145:classification; D013499:Surface Properties; D016019:Survival Analysis
chemical_list: D015921:Dental Implants