title: Success and complications of implant-retained prostheses provided by the Post-Doctoral Prosthodontics Program, University of Puerto Rico: a cross-sectional study.
abstract: BACKGROUND
  The success rate of implant-retained prostheses in a postdoctoral prosthodontics program was unknown and could not be related to any set of potential clinical issues or patient characteristics.
  
  
  OBJECTIVE
  The purpose of this study was to determine the success rate of implant-retained prostheses placed by prosthodontic residents between 1997 and 2012 and to evaluate the associations between patient classifications and specific restoration characteristics as related to prosthesis success or failure.
  
  
  METHODS
  A total of 272 prostheses in 119 patients were clinically evaluated. Success was defined as the absence of prosthetic complications or any implant-related complication that affected prosthesis survival. Logistic regression was used to evaluate associations between prosthesis success/failure and a wide array of study variables, adjusting for patient age, sex, and prosthesis longevity.
  
  
  RESULTS
  The overall success rate was 71%, with a mean prosthesis age of 4.5 years (range: 4 months to 16.8 years). Implant single crowns were the most successful prosthesis type (81% success). The most common complications observed were porcelain fractures in fixed dental prostheses (15%) and lack of stability (31%) and retention (29%) in removable dental prostheses. Having a removable prosthesis (versus natural dentition) in the opposing occlusion significantly decreased the odds of success (OR=0.26, 95% CI: 0.11-0.64). Definitively cemented fixed prostheses were more successful than those cemented with an interim cement (OR=4.56, 95% CI: 1.37-15.22).
  
  
  CONCLUSIONS
  The overall success rate of the implant-retained prostheses placed in the program was low compared with previously published studies. This study revealed the need for an efficient, comprehensive recall system for patients receiving implant-retained prostheses, either fixed or removable.
authors.affiliation: Professor, Prosthodontics Section, School of Dental Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico. Electronic address: maria.loza3@upr.edu.
authors.forename: María A
authors.initials: MA
authors.lastname: Loza-Herrero
authors.affiliation: Assistant Professor, Deanship of Research, Center for Clinical Research and Health Promotion, School of Dental Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico.
authors.forename: Sona
authors.initials: S
authors.lastname: Rivas-Tumanyan
authors.affiliation: Professor, Oral Biology Section, School of Dental Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico.
authors.forename: Evangelia
authors.initials: E
authors.lastname: Morou-Bermudez
mesh_terms: D000368:Aged; D003430:Cross-Sectional Studies; D015921:Dental Implants / Q000706:statistics & numerical data*; D017268:Dental Prosthesis Retention / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011647:Puerto Rico; D016896:Treatment Outcome; D014495:Universities
chemical_list: D015921:Dental Implants