title: Investigation of the Association Between Cement Retention and Prevalent Peri-Implant Diseases: A Cross-Sectional Study.
abstract: BACKGROUND
  The aim of this study is to examine the association between retention type (cement-retained versus screw-retained restorations) and prevalence of peri-implant diseases in a German university-treated population.
  
  
  METHODS
  Data were analyzed from individuals that underwent clinical and radiographic peri-implant examinations as part of a university-based cross-sectional study from September 2011 to October 2012.
  
  
  RESULTS
  Data from 139 individuals (mean age: 57.59 years) having 394 implants were analyzed: 192 implants supporting single crowns and 202 fixed partial dentures. Overall, 11.9% of the participants had peri-implantitis, whereas 68.9% had peri-implant mucositis. Crude odds ratios (95% confidence intervals) for peri-implantitis and peri-implant mucositis for cement- versus screw-retained restorations were 1.43 (0.45, 4.60) and 0.89 (0.53, 1.48), respectively. Results remained non-significant in multivariable models adjusting for type of restoration and smoking (all P values >0.50). There was also no effect of splinting restorations on disease prevalence in adjusted analyses (P values >0.32).
  
  
  CONCLUSIONS
  In this university-treated sample, there is no association between the type of prosthesis retention and peri-implant diseases. Current findings show that, when appropriate selection and removal of cement is performed, cement retention is not a risk indicator for peri-implant diseases.
authors.affiliation: Department of Periodontology, University of Washington, Seattle, WA.
authors.forename: Georgios A
authors.initials: GA
authors.lastname: Kotsakis
authors.affiliation: Biostatistical Design and Analysis Center, University of Minnesota, Minneapolis, MN.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Currently, Department of Mathematics and Statistics, Auburn University, Auburn, AL; previously, Biostatistical Design and Analysis Center, University of Minnesota.
authors.forename: Philippe
authors.initials: P
authors.lastname: Gaillard
authors.affiliation: Department of Prosthodontics, Dresden University of Technology, Dresden, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Raedel
authors.affiliation: Department of Prosthodontics, Dresden University of Technology, Dresden, Germany.
authors.forename: Michael Horst
authors.initials: MH
authors.lastname: Walter
authors.affiliation: Department of Prosthodontics, Dresden University of Technology, Dresden, Germany.
authors.forename: Ioannis K
authors.initials: IK
authors.lastname: Konstantinidis
mesh_terms: D003430:Cross-Sectional Studies; D003442:Crowns; D003738:Dental Cements; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D006801:Humans; D008875:Middle Aged; D057873:Peri-Implantitis / Q000517:prevention & control*
chemical_list: D003738:Dental Cements; D015921:Dental Implants
keywords: Cross-sectional studies; dental cements; dental implants; dental prosthesis, implant-supported; mucositis; peri-implantitis