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Article

Surface Characteristics and Color Stability of Dental PEEK Related to Water Saturation and Thermal Cycling

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Department of Dental Prostheses Technology (Dental Technology), Center for Advanced Technologies in Dental Prosthodontics, Faculty of Dental Medicine, Victor Babeș University of Medicine and Pharmacy Timișoara, Eftimie Murgu Square No. 2, 300041 Timișoara, Romania
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National Institute for Research and Development in Electrochemistry and Condensed Matter, 300569 Timisoara, Romania
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Department of Materials and Fabrication Engineering, Politehnica University Timişoara, Bulevard MihaiViteazul nr.1, 300222 Timişoara, Romania
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Department of Preventive, Community Dentistry and Oral Health, Center for Advanced Technologies in Dental Prosthodontics, Faculty of Dental Medicine, Victor Babes University of Medicine and Pharmacy Timișoara, Eftimie Murgu Square No. 2, 300041 Timișoara, Romania
*
Author to whom correspondence should be addressed.
Academic Editors: Márk Fráter, Edina Lempel and Zsolt Tóth
Polymers 2022, 14(11), 2144; https://doi.org/10.3390/polym14112144
Received: 12 April 2022 / Revised: 15 May 2022 / Accepted: 23 May 2022 / Published: 25 May 2022
(This article belongs to the Special Issue Advanced Polymeric Materials for Dental Applications)
(1) Background: The study was undertaken to evaluate the surface characteristics, microhardness, and color stability of PEEK materials related to water saturation and in vitro aging. (2) Methods: Custom specimens of unmodified and modified PEEK CAD/CAM materials were investigated: BioHPP, a ceramic reinforced PEEK, and Finoframe PEEK and Juvora medical PEEK, 100% PEEK materials. Forty-eight plates were sectioned in rectangular slices. The specimens were immersed in distilled water at 37 °C for a period of 28 days, and then subjected to aging by thermal cycling (10,000 cycles). Surface roughness was measured with a contact profilometer; nanosurface topographic characterization was made by Atomic Force Microscopy; Vickers hardness measurements were performed with a micro-hardness tester; color changes were calculated. All registrations were made before immersion in water and then subsequently once a week for 4 weeks, and after thermocycling. (3) Results: The studied reinforced and unfilled PEEK materials reached water saturation after the first week of immersion, without significant differences between them. The most affected from this point of view was the reinforced PEEK material. Thermocycling induces a significant increase inmicroroughness, without significant differences between the studied materials. In relation to the nanosurface topography and roughness, the reinforced PEEK material was the least modified by aging. The color changes after 4 weeks of water immersion and one year of simulated in vitro aging ranged from extremely slight to slight, for all materials. (4) Conclusions: Water absorption was associated with a decrease in microhardness. Surface characteristics are affected by water immersion and thermocycling. Perceivable or marked color changes of the materials were not detected during the study. View Full-Text
Keywords: dental PEEK; surface characteristics; microhardness; color changes; water saturation; thermal cycling dental PEEK; surface characteristics; microhardness; color changes; water saturation; thermal cycling
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MDPI and ACS Style

Porojan, L.; Toma, F.R.; Bîrdeanu, M.I.; Vasiliu, R.D.; Uțu, I.-D.; Matichescu, A. Surface Characteristics and Color Stability of Dental PEEK Related to Water Saturation and Thermal Cycling. Polymers 2022, 14, 2144. https://doi.org/10.3390/polym14112144

AMA Style

Porojan L, Toma FR, Bîrdeanu MI, Vasiliu RD, Uțu I-D, Matichescu A. Surface Characteristics and Color Stability of Dental PEEK Related to Water Saturation and Thermal Cycling. Polymers. 2022; 14(11):2144. https://doi.org/10.3390/polym14112144

Chicago/Turabian Style

Porojan, Liliana, Flavia Roxana Toma, Mihaela Ionela Bîrdeanu, Roxana Diana Vasiliu, Ion-Dragoș Uțu, and Anamaria Matichescu. 2022. "Surface Characteristics and Color Stability of Dental PEEK Related to Water Saturation and Thermal Cycling" Polymers 14, no. 11: 2144. https://doi.org/10.3390/polym14112144

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