IADR Abstract Archives
The McGill Denture Satisfaction Questionnaire (MDSQ) Revisited: Exploratory Factor Analysis
Objectives: Our objectives was to examine the MDSQ in terms of its dimensionality and possible item reduction in a binational sample of complete denture wearers.
Methods: This study provides secondary analyses of baseline data from two study on implant-retained overdentures: a quasi-experimental study in the US (University of Texas, n=145); and a randomized trial in Brazil (University of Sao Paulo, n=120). All participants were C/C denture wearers and provided responses to the MDSQ items referring to their mandibular dentures, before implants. A putative model of the MDSQ items (Figure 1) resulted in two question subsets subjected to separate analyses: (1) six questions on overall satisfaction, retention/stability, esthetics, cleaning, speech and comfort, plus two questions on general chewing ability; (2) mastication of specific foods (American study only). Analyses focused on the internal consistency of the subsets and possible item reduction, using Cronbach's alpha (Cα), inter-item correlation and exploratory factor analysis (EFA).
Results: For the 1st subset of questions, inter-item correlation was high for most combinations but disclosed no redundancy (r≤0.8). An item on cleaning had low correlation, but its removal does not increase internal consistency (Cα≥0.83). Results were nearly similar for both studies, with EFA showing a single significant factor (namely, “overall satisfaction, lower denture”) able to explain nearly 54% of the variance. The 2nd subset also shows strong internal consistency (Cα≥0.95) and inter-item correlation; however, we observe evident redundancy (r>0.8) for questions on a specific food (“salami”). A single factor (“masticatory ability”) represented 65% of the variation for the second subset.
Conclusions: This study endorses the reliability and validity of the MDSQ as a tool for patient-centered evaluation of complete dental prostheses in the edentulous mandible. Findings support the calculation of “overall satisfaction” and “masticatory ability” summary scores, by using a less burdensome questionnaire.
Methods: This study provides secondary analyses of baseline data from two study on implant-retained overdentures: a quasi-experimental study in the US (University of Texas, n=145); and a randomized trial in Brazil (University of Sao Paulo, n=120). All participants were C/C denture wearers and provided responses to the MDSQ items referring to their mandibular dentures, before implants. A putative model of the MDSQ items (Figure 1) resulted in two question subsets subjected to separate analyses: (1) six questions on overall satisfaction, retention/stability, esthetics, cleaning, speech and comfort, plus two questions on general chewing ability; (2) mastication of specific foods (American study only). Analyses focused on the internal consistency of the subsets and possible item reduction, using Cronbach's alpha (Cα), inter-item correlation and exploratory factor analysis (EFA).
Results: For the 1st subset of questions, inter-item correlation was high for most combinations but disclosed no redundancy (r≤0.8). An item on cleaning had low correlation, but its removal does not increase internal consistency (Cα≥0.83). Results were nearly similar for both studies, with EFA showing a single significant factor (namely, “overall satisfaction, lower denture”) able to explain nearly 54% of the variance. The 2nd subset also shows strong internal consistency (Cα≥0.95) and inter-item correlation; however, we observe evident redundancy (r>0.8) for questions on a specific food (“salami”). A single factor (“masticatory ability”) represented 65% of the variation for the second subset.
Conclusions: This study endorses the reliability and validity of the MDSQ as a tool for patient-centered evaluation of complete dental prostheses in the edentulous mandible. Findings support the calculation of “overall satisfaction” and “masticatory ability” summary scores, by using a less burdensome questionnaire.
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