The effect of in-office bleaching agents on the Vickers hardness and surface topography of polished and unpolished CAD/CAM composite materials.
Autor: | Alamoush RA; Department of Fixed and Removable Prosthodontics, School of Dentistry, The University of Jordan, Amman, 11942, Jordan., Yang J; Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China.; National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China., Alhotan A; Department of Dental Health, College of Applied Medical Sciences, King Saud University, 11545, Riyadh, Saudi Arabia., Haider J; Department of Engineering, Manchester Metropolitan University, Manchester, M1 5GD, UK.; Division of Dentistry, School of Medical Sciences, The University of Manchester, Manchester, M13 9PL, UK., Matinlinna JP; Division of Dentistry, School of Medical Sciences, The University of Manchester, Manchester, M13 9PL, UK., Elraggal A; Operative Dentistry, Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt. alaa.elraggal@alexu.edu.eg. |
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Jazyk: | angličtina |
Zdroj: | Scientific reports [Sci Rep] 2023 Sep 15; Vol. 13 (1), pp. 15341. Date of Electronic Publication: 2023 Sep 15. |
DOI: | 10.1038/s41598-023-42415-4 |
Abstrakt: | In-office bleaching, using hydrogen peroxide, is effective to remove dental enamel stains. However, bleaching agents can deteriorate surface properties of CAD-CAM materials. This in vitro study aimed to investigate the effect of in-office bleaching agents on Vickers hardness and surface topography of polished and unpolished dental CAD-CAM composite materials (Grandio blocs, Lava Ultimate, BRILLIANT Crios, Cerasmart), and a polymer-infiltrated ceramic network block (Vita Enamic). The specimens were randomly divided into two groups: unpolished or polished. The micro-hardness and surface topography of each group were measured before bleaching, after a 60 min bleaching period, and 24-h and one-month post-bleaching. In-office bleaching significantly influenced the Vickers hardness of both the polished and unpolished CAD/CAM composite blocks, with Vita Enamic exhibiting the least hardness stability among all groups. Furthermore, in-office bleaching significantly influenced the surface roughness of unpolished CAD/CAM composite blocks. There was a significant difference in hardness reduction between the polished and unpolished specimens for most of the investigated materials at different time points. The bleaching did not influence the surface roughness of the investigated polished group, except for Vita Enamic and Lava Ultimate. However, it did influence the surface roughness of the investigated materials in the unpolished group. (© 2023. Springer Nature Limited.) |
Databáze: | MEDLINE |
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