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Effect of Cleansers on the Colour Stability of Zirconia Impregnated PMMA Bio-Nanocomposite

Dentistry, School of Medical Sciences, University of Manchester, Manchester M13 9PL, UK
Department of Dental Materials, Faculty of Dentistry, Sebha University, Sebha, Libya
Department of Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1757;
Received: 29 July 2020 / Revised: 27 August 2020 / Accepted: 2 September 2020 / Published: 6 September 2020
(This article belongs to the Special Issue Nanomaterials in Oral Science)
Exposure of denture base acrylic resins to the oral environment and storage media for extended periods of time results in colour change due to changes in the properties of the material. The purpose of this in vitro study was to assess the colour stability of high-impact heat-polymerized denture base acrylic resin (HI PMMA) impregnated with zirconia nanoparticles after storage in distilled water (DW) and denture cleaners such as Steradent (STD) and Milton (MIL) for 180 days. Ninety specimens of PMMA + Zirconia nanocomposite with varying nanoparticle concentrations (1.5 wt.%, 3.0 wt.%, 5.0 wt.%, 7.0 wt.% and 10 wt.%) were prepared with a diameter and thickness of 25 ± 1.0 mm × 2 ± 0.1 mm and divided into six groups, while each group was further divided into three subgroups: storage in DW (control), STD and MIL. Colour changes were measured with a Minolta Chroma Meter (Minolta, Osaka, Japan), and assessed using the CIE L*a*b* colorimetric system. Data were statistically analysed for colour change with Friedman’s Two-way and Kruskal-Wallis tests at a pre-set alpha value level of 0.05. The colour change (ΔΕ) exhibiting significant differences were found among all groups immersed in denture cleaners, and all values increased with time. According to the National Bureau of Standards, the control group displayed the lowest colour change value (ΔΕ = 1.22), and the highest value was for 10 wt.% ZrO2 while stored in MIL (ΔΕ = 6.07). The values of colour change for storage in water ranged from 0.49 (control) to 1.82 (10 wt.% ZrO2). The colour change value for the composite group containing 3 wt.% zirconia was clinically acceptable. However, high concentrations of denture cleaners should be avoided, and the shortest cleaning time is recommended to improve the clinical life of the nanocomposite denture base. View Full-Text
Keywords: denture; PMMA; zirconia (ZrO2); nanocomposite; colour stability denture; PMMA; zirconia (ZrO2); nanocomposite; colour stability
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MDPI and ACS Style

Zidan, S.; Silikas, N.; Haider, J.; Yates, J. Effect of Cleansers on the Colour Stability of Zirconia Impregnated PMMA Bio-Nanocomposite. Nanomaterials 2020, 10, 1757.

AMA Style

Zidan S, Silikas N, Haider J, Yates J. Effect of Cleansers on the Colour Stability of Zirconia Impregnated PMMA Bio-Nanocomposite. Nanomaterials. 2020; 10(9):1757.

Chicago/Turabian Style

Zidan, Saleh, Nikolaos Silikas, Julfikar Haider, and Julian Yates. 2020. "Effect of Cleansers on the Colour Stability of Zirconia Impregnated PMMA Bio-Nanocomposite" Nanomaterials 10, no. 9: 1757.

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