title: Patient perceptions of the mandibular three-implant overdenture: a practice-based study.
abstract: OBJECTIVE
  Although three-implant overdentures have often been used in clinical practice, there are few studies to support this approach. Therefore, this study aimed to determine the magnitude of change in ratings of oral health-related quality of life and to assess patients' satisfaction ratings with mandibular three-implant overdentures.
  
  
  METHODS
  This quasi-experimental study examined oral health-related quality of life and satisfaction with prosthesis in 135 edentate participants (mean age 61.6 ± 7.9 years) who received mandibular three-implant overdentures from 2006 to 2009 in a private practice in Quebec, Canada. Data were collected from individual's dental records and a follow-up survey. The Oral Health Impact Profile (OHIP-20) was used to assess oral health-related quality of life at baseline and at follow-up. Satisfaction with the mandibular prostheses and perception of rocking movements were measured by use of a denture satisfaction questionnaire at follow-up. Descriptive statistics, bivariate and multivariate statistical analyses were used to analyse the data.
  
  
  RESULTS
  Individuals who received mandibular three-implant overdentures had statistically significant improvements in all seven domains of the OHIP-20 from pre- to post-treatment (total OHIP change score -25.1 P < 0.001). Pre-treatment OHIP scores and rotational movement explained 58% of the variance in the OHIP's change score (P ≤ 0.05). More than three quarters of the sample population (75.6%) were completely satisfied with their three-implant overdentures, and 81.5% reported having no rocking movement. General satisfaction with the prostheses was not influenced by gender, type of fixture, or type of attachment.
  
  
  CONCLUSIONS
  The treatment of edentulism by three-implant overdentures has favourable patient-based outcomes, with negligible perceptions of rotational movement. However, further research is needed to compare the efficacy of this alternative to other treatment modalities, such as the two-implant overdenture.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Université de Montréal, Montreal, QC, Canada; Department of Social and Preventive Medicine, School of Public Health, Université de Montréal, Montreal, QC, Canada.
authors.forename: Elham
authors.initials: E
authors.lastname: Emami
authors.forename: Raphael F
authors.initials: RF
authors.lastname: de Souza
authors.forename: Jacques
authors.initials: J
authors.lastname: Bernier
authors.forename: Pierre
authors.initials: P
authors.lastname: Rompré
authors.forename: Jocelyne S
authors.initials: JS
authors.lastname: Feine
mesh_terms: D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003779:Denture Design; D003781:Denture Retention; D003826:Denture, Complete, Lower; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008875:Middle Aged; D009909:Oral Health; D017060:Patient Satisfaction; D011788:Quality of Life; D011792:Quebec; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: implant; implant overdenture; oral health-related quality of life; patient satisfaction