198 The mandibular 3-implant overdenture

Thursday, March 22, 2012: 10:45 a.m. - 12:15 p.m.
Presentation Type: Oral Session
E. EMAMI1, J. BERNIER2, P. ROMPRE1, and J.S. FEINE3, 1Universite de Montreal, Montreal, QC, Canada, 2Private Practice, Ste-Foy, QC, Canada, 3Faculty of Dentistry, McGill University, Montreal, QC, Canada

To determine the magnitude of change in ratings of oral health related quality of life and to assess patients’ satisfaction ratings with mandibular 3-implant overdentures.


This quasi-experimental study examined satisfaction and oral health related quality of life in 135 edentate individuals (mean 61 ±21 years) who received mandibular 3-implant-overdentures from 2006-2009 in a private practice in Quebec, Canada. Data were collected from individuals’ dental records and a follow-up survey. The 20-item Oral Health Impact Profile (OHIP-20) was used to assess oral health quality of life at baseline and at follow-up. Rocking movements and satisfaction with the mandibular prostheses were measured by use of a denture satisfaction questionnaire at post-treatment. Paired t-tests and change scores were used to determine the magnitude of change from pre to post treatment.  Post-treatment satisfaction values for satisfied and dissatisfied individuals were analyzed using chi-square tests. Regression analyses were used to evaluate the effects of demographic variables, type of fixtures and type of attachment system on treatment outcomes.


Individuals who received mandibular 3-implant overdentures had statistically significant improvements in all 7 domains of the OHIP-20 from pre to post treatment (total OHIP change score -25.1 p<0.001). The mean of the OHIP post treatment total score was not influenced by sex, type of fixtures or type of attachment. Approximately 79% of individuals reported having no rocking movement, and 76% were completely satisfied with their 3-implant overdentures. General satisfaction was not influenced by sex, type of fixture or type of attachment. 


These results suggest that the majority of individuals wearing mandibular 3-implant overdentures do not report rotational movements, and they have improved patient-based outcomes.  However, further research is needed to assess the efficacy of this treatment modality in relation to other types of overdentures.

This abstract is based on research that was funded entirely or partially by an outside source: Astra Tech AB

Keywords: Implants, Prostheses and Quality of life
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