title: Does implant staging choice affect crestal bone loss?
abstract: OBJECTIVE
  The purpose of the present study was to compare the crestal bone loss around implants placed according to either a 1-stage or 2-stage implant installation procedure using a digital subtraction radiography technique.
  
  
  METHODS
  In the present randomized clinical trial, screw-shaped tapered implants were inserted in the posterior mandible of patients needing fixed partial dentures. In each edentulous area, according to the randomization table, 1 implant was inserted using a 1-stage procedure (group 1) and 1 was placed using a 2-stage approach (group 2). The implants were temporized with the relined denture after 2 weeks. All implants were functionally loaded with fixed partial dentures after 3 months. Crestal bone loss (primary outcome variable) was measured using a digital subtraction radiography technique. Standardized radiovisiographs were taken after implant insertion, after fixed partial denture installation (3 months after surgery), and after 6 and 12 months of functional loading. The data were analyzed using the Wilcoxon signed ranks test (α = 0.05).
  
  
  RESULTS
  Eleven patients (mean age 46.9 years, 3 women and 8 men) were included in the study. A total of 34 implants were inserted, 17 using a 1-stage protocol and 17 using a 2-stage protocol. Three months after implant placement, the 2-stage implants showed significantly more crestal bone loss (0.65 ± 0.71 mm) than the 1-stage implants (0.41 ± 0.53 mm; P = .02). However, after 6 and 12 months of functional loading, both groups showed comparable changes in bone level (P > .05).
  
  
  CONCLUSIONS
  No differences were found between 1-stage and 2-stage implant placement in crestal bone loss after 1 year of functional loading.
authors.affiliation: Implant Research Center and Department of Prosthodontics, Tehran University of Medical Sciences School of Dentistry, Tehran, Iran.
authors.forename: Hakimeh
authors.initials: H
authors.lastname: Siadat
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Panjnoosh
authors.forename: Marzieh
authors.initials: M
authors.lastname: Alikhasi
authors.forename: Masoud
authors.initials: M
authors.lastname: Alihoseini
authors.forename: Seyed Hossein
authors.initials: SH
authors.lastname: Bassir
authors.forename: Amir Reza
authors.initials: AR
authors.lastname: Rokn
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology*; D000539:Alveolar Process / Q000000981:diagnostic imaging; D059605:Dental Implant-Abutment Design; D003758:Dental Implantation, Endosseous / Q000379:methods*; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003830:Denture, Partial, Fixed; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D057893:Immediate Dental Implant Loading; D007576:Jaw, Edentulous, Partially / Q000000981:diagnostic imaging / Q000534:rehabilitation / Q000601:surgery; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery; D008875:Middle Aged; D019252:Radiography, Dental, Digital; D013382:Subtraction Technique; D013524:Surgical Flaps; D016896:Treatment Outcome; D055815:Young Adult