Color changes of polyetheretherketone (PEEK) and polyoxymethelene (POM) denture resins on single and combined staining/cleansing action by CIELab and CIEDE2000 formulas |
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| Institution: | 1. Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece;2. Department of Operative Dentistry, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece;3. Department of Restorative Dental Sciences, Division of Prosthodontics, University of Florida College of Dentistry, Gainesville, FL, United States;1. University of Rome Tor Vergata, Italy;2. Adjunct Associate Professor, Dental college of Georgia, Augusta University, USA. Private practice, Rome, Italy;3. Department of Periodontology and Oral Surgery, University of Liège, Belgium;4. Bernhard Gottlieb University Clinic of Dentistry, Medical University of Vienna, Austria;5. Department of Mathematics, University of Rome Tor Vergata, Italy;1. Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita 565-0871, Japan;2. Department of Oral Health Sciences, Otemae College, 6-42 Ochayasho-cho, Nishinomiya, Hyogo 6628552, Japan |
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| Abstract: | PurposeThe purpose of study was to investigate the long-term effect of staining and/or cleansing solutions on the color stability of two non-metal removable partial denture materials.MethodsOne hundred disks (25×3 mm) of polyoxymethylene (POM) and polyetheretherketone (PEEK) were immersed in water, wine, coffee, cleanser and combo bath, simulating normal daily use. Color parameters in the CIELAB system was measured every 30 cycles up to 240 using a contact colorimeter and color differences estimated using ΔEab and ΔE00 formulas. Two-way repeated measures ANOVAs and regression analyses were performed at α = 0.05.ResultsRegression analysis indicated a strong R2 between color changes and number of cycles, for both materials. Tests of within-subjects effects for the ΔEab revealed significant differences among cycles and between the materials in the wine and coffee baths (p < 0.001). Significant materialXcycles interactions were also recorded with all staining baths. ΔE00 values were lower than ΔEab up to 63.6%. Tests within and between-subjects effects for the ΔE00 gave similar but not the same with ΔEab results.ConclusionsΔE00 found to correlate well with ΔEab. Long term exposure of both materials showed a progressive discoloration in all except control baths. POM discolored more than PEEK in coffee, and combo baths but not in cleanser. Discoloration was smaller in combo bath (where a cleanser was also used) indicating the effectiveness of a cleanser to prevent long term discoloration of both materials. |
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| Keywords: | Color changes PEEK POM CIELab CIEDE2000 |
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