Oral-health related quality of life in patients with non-metal clasp dentures: a randomized crossover trial

Abstract

Objectives

We investigated the efficacy of non-metal clasp dentures (NMCDs) with regard to the oral-health related quality of life (OHRQoL) and compare the findings with those for conventional metal clasp-retained dentures (MCDs).

Methods

This single-centre, randomized controlled, two-phase, open label, crossover trial included 28 partially dentate individuals. The patients were randomized to receive MCDs followed by NMCDs, or the opposite sequence (n = 14 in each group); each denture was worn for 3 months. OHRQoL was evaluated using the Oral Health Impact Profile-Japanese version (OHIP-J) at entry (T-entry; before treatment with the first denture) and at 3 months after treatment with each denture (T3). An examiner evaluated denture stability, oral appearance and surface roughness before denture delivery (T0) and at T3 and denture hygiene at T3.

Results

A total of 24 patients completed the trial. There were no complications related to the dentures, abutment teeth or denture-bearing mucosa during the follow-up periods for both dentures. The mean OHIP summary score was lower for NMCDs than for MCDs, and the difference (9 points) was greater than the minimal important difference (6 points), indicating the difference was clinically relevant. The effect size was medium (0.70). Statistical analyses with linear mixed models found a significant effect of the denture type on the OHIP summary score and scores for the Orofacial appearance, Orofacial pain and Psychological impact domains (NMCD < MCD; P < 0.05).

Conclusions

The results of our study suggest that NMCDs allow for better OHRQoL compared with MCDs.

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