title: Short (5 and 7 mm long) porous implants in the posterior atrophic maxilla: a 5-year report of a prospective single-cohort study.
abstract: OBJECTIVE
  The aim of this ongoing prospective study was to determine the 5-year survival rate of short porous dental implants in the posterior atrophic maxilla combined, when necessary, with crestal sinus floor elevation and often adding anorganic bovine bone.
  
  
  METHODS
  In 87 partially edentulous patients, 110 short porous implants were placed and followed up for 5 years. The implants used were of two lengths (5 and 7 mm) and two diameters (4.1 and 5 mm) and were chosen according to the available crestal height and width. In 47 sites, osteotome sinus floor elevation was performed (in 8 cases compacting basal bone, in 39 adding a xenograft). The unloaded healing period was 6 months. A total of 63 implants were restored with single crowns and 47 were splinted to the adjacent implants. Outcome measures were prosthesis and implant failures, any complications, and peri-implant marginal bone resorption.
  
  
  RESULTS
  Five years after loading, no patients dropped out. Eleven implants failed: 2 implants at uncovering and 9 after prosthetic loading. Eleven patients (12.6%) lost 1 implant. In 6 patients (6.9%) a prosthesis failure occurred (implants loaded with single crowns). One surgical complication (membrane perforation) occurred but the implant was normally inserted. No complications occurred during the healing period. In 3 patients, severe peri-implantitis occurred post loading and the implants had to be removed. Two abutments became loose and one crown chipped. At the end of the follow-up period the implant survival rate was 90%, and 93.1% with regard to prosthetic reconstruction. The mean peri-implant marginal bone loss was 1.4 mm.
  
  
  CONCLUSIONS
  The use of short porous implants showed an acceptable clinical outcome in the treatment of the posterior maxilla in this interim 5-year report. Longer follow-ups are needed to confirm these results.
authors.affiliation: Private Practice, Turin, Italy. micperelli@yahoo.it
authors.forename: Michele
authors.initials: M
authors.lastname: Perelli
authors.forename: Roberto
authors.initials: R
authors.lastname: Abundo
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Corrente
authors.forename: Carlo
authors.initials: C
authors.lastname: Saccone
mesh_terms: D001284:Atrophy; D001857:Bone Matrix / Q000637:transplantation; D018786:Bone Substitutes / Q000627:therapeutic use; D015331:Cohort Studies; D003442:Crowns; D059605:Dental Implant-Abutment Design; D003758:Dental Implantation, Endosseous / Q000295:instrumentation; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008903:Minerals / Q000627:therapeutic use; D016348:Osseointegration / Q000502:physiology; D010027:Osteotomy / Q000295:instrumentation; D057873:Peri-Implantitis / Q000209:etiology / Q000601:surgery; D016062:Porosity; D011183:Postoperative Complications; D011446:Prospective Studies; D059546:Sinus Floor Augmentation / Q000379:methods; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: C077540:Bio-Oss; D018786:Bone Substitutes; D015921:Dental Implants; D008903:Minerals