Validation of the Vietnamese version of the patient's denture assessment questionnaire in complete denture wearers

The patient's denture assessment (PDA) is a standardized self-reported questionnaire developed in Japan to evaluate patient satisfaction with complete dentures. Although it has been validated in multiple languages, no validated version existed for the Vietnamese population. This study aimed to assess the psychometric properties of the Vietnamese version of the PDA (PDA-V) in a clinical sample of complete denture wearers.

A cross-sectional validation study was conducted with 200 complete denture wearers in a public dental hospital in Vietnam. Internal consistency was assessed using Cronbach's α. Test-retest reliability was evaluated in a subsample of 120 participants after a 7-14 day interval using intraclass correlation coefficients (ICCs). Convergent validity was examined through correlation with a 100-mm visual analog scale (VAS) of global denture satisfaction. Discriminant validity was tested by comparing PDA-V scores between patients clinically judged as needing new dentures and those who did not.

The PDA-V demonstrated excellent internal consistency across all six subscales (Cronbach's α = 0.82-0.87) and strong test-retest reliability (ICC = 0.86-0.92). A significant positive correlation was found between total PDA-V and VAS satisfaction scores (ρ = 0.78, P < 0.001), supporting convergent validity. Discriminant validity was confirmed by significantly lower PDA-V scores in patients assessed as needing new dentures (P < 0.01). No significant ceiling or floor effects were observed.

The PDA-V is a reliable and valid instrument for evaluating patient satisfaction with complete dentures. It is suitable for both clinical assessment and research purposes in the Vietnamese population.