Method: A total of 618 adult subjects participated in the study, 74.4% were female. The mean age was 41.9±14.6 years and 21.36% were denture wearers. We conducted confirmatory factor analysis to assess goodness-of-fit of the original seven-factor structure (functional limitation, pain, psychological discomfort, physical disability, psychological disability, social disability and handicap).χ2/df, CFI, GFI e RMSEA were used as indices of goodness-of-fit. The Convergent validity was estimated by the average variance extracted (AVE). Reliability was estimated by Composite Reliability (CR) and Cronbachs’s alpha. The Discriminant validity was assessed by correlational analysis (ρ2). The stability of the model for users (sample A) and non-users (sample B) of Complete Denture was tested by multigroup analysis (Δχ2).
Result: The confirmatory factor analysis showed good fit to the total sample (χ2/df=2.885;CFI=0.975;GFI=0.964;RMSEA=0.055), to the users (sample A: χ2/df=1.566;CFI=0.967;GFI=0.918;RMSEA=0.066) and to the non-users of Complete Denture (sample B: χ2/df=2.554;CFI=0.974;GFI=0.959;RMSEA=0.057). The internal consistency and the Composite Reliability (CR) was adequate for the total sample. The convergent and discriminant validities were adequate for all samples (Total sample: AVE=0.500-0.665;ρ2=0.178-0.636; A: AVE=0.514-0.681;ρ2=0.169-0.472; B:AVE=0.500-0.665; ρ2=0.193-0.484) except for the users of Complete Denture (Sample B) to factor "psychological discomfort” (AVE:0,443). We observed measurement invariance of the OHIP-14 to users and non-users of Complete Denture (λ:Δχ2=6.148;p=0.523;Cov: Δχ2=51.223;p=0.050; Res:Δχ2=37.544;p=0.001).
Conclusion: The version of OHIP-14 applied to Brazilian dental patients was reliable and its stability was strong among users and non-users of Complete Denture.