title: Clinical and Radiographic Comparison between Platform-Shifted and Nonplatform-Shifted Implant: A One-Year Prospective Study.
abstract: BACKGROUND
  Developments in implant hardware and biologic understanding improved treatment predictability in terms of implant survival. Current research focuses on accelerated loading protocols and crestal bone preservation.
  
  
  OBJECTIVE
  This prospective, monocenter study analyzed the clinical and radiographic outcome of a novel parallel-walled implant, with and without platform shift.
  
  
  METHODS
  Forty-eight consecutively treated patients (30 women, 18 men) with crowns/bridges supported by 115 implants were included. Eighty-three percent of implants were nonocclusal, immediately loaded, and 17% were subjected to one-stage surgery and delayed loading after 10 weeks; 39.1% were of diameter 5.0 mm, enabling platform shifting with a 4.0 mm-wide prosthetic component; 60.9% were of diameter 4.0 mm with a 4.0 mm component. Radiographic crestal bone levels were assessed at baseline and 1 year. A multivariate statistical analysis was performed to determine factors affecting crestal bone loss after 1 year.
  
  
  RESULTS
  All implants survived and mean marginal bone loss was 0.73 mm (SD: 0.13; range: -0.60 to 5.0 mm). There was a statistically significant difference between platform-shifted (0.63 mm; SD: 0.18) and nonplatform-shifted (1.02 mm; SD: 0.14) implants. Implants in abundant bone volume lost significant less crestal bone (0.45 mm; SD: 0.14) compared with implants in small volume (1.20 mm; SD: 0.21). Implant diameter, loading time, anatomical position, smoking, and bone quality did not affect crestal bone loss.
  
  
  CONCLUSIONS
  After 1 year of loading, both implant-prosthetic features yield a high survival and limited crestal bone loss. Crestal bone loss is minimized using platform-shifted implants placed in sufficiently voluminous bone. To limit the crestal bone loss, an adopted implant diameter with platform shifting should be considered.
authors.affiliation: Department of Periodontology and Oral Implantology, Dental School, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
authors.forename: Maarten
authors.initials: M
authors.lastname: Glibert
authors.affiliation: Department of Periodontology and Oral Implantology, Dental School, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
authors.forename: Stijn
authors.initials: S
authors.lastname: Vervaeke
authors.affiliation: Department of Periodontology and Oral Implantology, Dental School, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.|Department of Prosthodontics, School of Dentistry, Malmö University, Malmö, Sweden.
authors.forename: Hugo
authors.initials: H
authors.lastname: De Bruyn
authors.affiliation: Department of Periodontology and Oral Implantology, Dental School, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
authors.forename: Pär-Olov
authors.initials: PO
authors.lastname: Östman
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000517:prevention & control; D003442:Crowns; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003829:Denture, Partial; D005260:Female; D006801:Humans; D057893:Immediate Dental Implant Loading; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011862:Radiography, Panoramic; D013499:Surface Properties; D019415:Torque; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: bone volume; dental implants; immediate loading; implant design; osseotite 2; platform shifting