The McGill Denture Satisfaction Questionnaire revisited: Exploratory factor analysis of a binational sample

• Published in: Gerodontology Vol. 37; no. 3; pp. 233 - 243
• Main Authors: Souza, Raphael F., Ribeiro, Adriana B., Oates, Thomas W., Feine, Jocelyne S.
• Format: Journal Article
• Language: English
• Published: England 01.09.2020
• Subjects: Brazil; complete denture; Dental Prosthesis, Implant-Supported; Denture Retention; Denture, Complete; Denture, Complete, Lower; Denture, Overlay; Esthetics, Dental; Factor Analysis, Statistical; Humans; Mastication; Patient Satisfaction; Personal Satisfaction; questionnaires; Reproducibility of Results; Surveys and Questionnaires; treatment outcome; Brazil; patient satisfaction; questionnaires; complete denture; treatment outcome
• ISSN: 0734-0664; 1741-2358; 1741-2358
• DOI: 10.1111/ger.12477

Objectives To examine the McGill Denture Satisfaction Questionnaire (MDSQ) in terms of dimensionality, item reduction and construct validity in a binational sample of complete denture wearers. Materials and Methods We conducted secondary analyses of baseline data from two studies on implant‐retained overdentures: a quasi‐experimental study in the United States (n = 145) and a randomised trial in Brazil (n = 120). All participants wore upper/lower dentures and responded at baseline to the MDSQ items concerning their original mandibular dentures. A putative model of the MDSQ items resulted in two question subsets: (a) overall satisfaction, retention/stability, aesthetics, cleaning, speech and comfort, plus general chewing ability; (b) mastication of specific foods. Analyses focused on the internal consistency of each subset and possible item reduction, using Cronbach's alpha (Cα), inter‐item correlation and exploratory factor analysis (EFA). Results The 1st subset showed high inter‐item correlation for most question combinations and no redundancy (r ≤ .8). An item on cleaning had low correlation, but its removal does not increase internal consistency (Cα ≥ .83). Results were 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 ≥ .95) and inter‐item correlation, with a single factor representing 65% of the variation. Conclusions This study discloses the reliability and construct validity of the MDSQ for patient‐centred evaluation of complete dental prostheses in the edentulous mandible. Findings also support the use of both “overall satisfaction” and “masticatory ability” as summary scores, for improved outcome assessment.