ArticleBiomaterial investigations in dentistry2026
The effect of simulated toothbrushing with regular and whitening dentifrices on the colour stability of high translucency zirconia.
Article in Biomaterial investigations in dentistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: High translucency zirconia (HTZ) restorations are increasingly used for aesthetic dental applications due to their superior optical properties. However, colour stability under routine oral hygiene procedures, especially toothbrushing with regular or whitening dentifrices, remains a clinical concern. This study evaluated the effect of simulated toothbrushing on the colour stability (ΔE) of two different HTZ materials. Methods: Sixty unglazed and unpolished HTZ samples (10 mm × 2 mm) were fabricated using Computer Aided Design and Computer Aided Manufacturing (CAD/CAM) technology and divided into two groups based on translucency (HTZ-A: 5.8-9.7 wt% yttria and HTZ-B: 4.4-5.5 wt% yttria; Results: Artificial saliva caused minimal colour change in both zirconia groups (ΔE = 1.677 for HTZA, 1.802 for HTZB). Regular dentifrice induced significant ΔE values (HTZ-A: 8.722, HTZ-B: 8.346), while whitening dentifrice caused a significantly highest colour change for HTZ-B (HTZ-A: 6.348, HTZ-B: 11.062). Pairwise comparison revealed significant differences among all subgroups ( Conclusion: Simulated toothbrushing significantly affects the colour stability of HTZ restorations. Whitening dentifrices produced the greatest colour change in highly translucent zirconia. Material composition and dentifrice selection should be considered to maintain long-term aesthetics of zirconia restorations.
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