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Changes to Glazed Dental Ceramic Shade, Roughness, and Microhardness after Bleaching and Simulated Brushing
Author(s) -
Rodrigues Carlos Roberto Teixeira,
Turssi Cecilia Pedroso,
Amaral Flávia Lucisano Botelho,
Basting Roberta Tarkany,
França Fabiana Mantovani Gomes
Publication year - 2019
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12663
Subject(s) - indentation hardness , opalescence , materials science , surface roughness , ultimate tensile strength , ceramic , dental ceramics , sandpaper , dental porcelain , surface finish , composite material , dentistry , medicine , microstructure , cubic zirconia , physics , quantum mechanics
Purpose To evaluate shade stability, surface roughness, microhardness, and compressive strength of a glazed feldspathic ceramic subjected to bleaching and simulated brushing. Materials and Methods Eighty‐eight glazed feldspathic ceramic specimens were made from microparticulate leucite and divided into eight groups (n = 10). The whitening products used were: Opalescence Trèswhite Supreme (Ultradent), Opalescence®\ PF 15% (Ultradent), and Oral‐B 3D White Whitestrips. All substances for whitening were used for 4 hours/day for a period of 14 days; the control group was not bleached. Next, half of the specimens were individually brushed. Microhardness and surface roughness data were subjected to three‐way ANOVA and Tukey test. The diametrical tensile strength data were subjected to two‐way ANOVA. The shade change data were analyzed using Kruskal‐Wallis, Mann‐Whitney, and the Student‐Newman‐Keuls test. The significance level was set at 5%. Results Glazed feldspathic ceramic surface microhardness was significantly affected by bleaching agents ( p = 0.007). Initially, glazed ceramic microhardness was significantly higher than that observed after contact with the bleaching agents, whether or not brushing was performed. The specimens submitted to bleaching in preloaded trays presented lower surface roughness values after brushing ( p = 0.037). The surface roughness was significantly lower in the brushed specimens ( p = 0.044). The diametrical tensile strength was not significantly affected by the application of bleaching agents ( p = 0.563) or by brushing ( p = 0.477). When the specimens were brushed, however, shade change was significantly influenced by the bleaching agent used ( p = 0.041). Conclusions Bleaching agents associated with brushing cycles can alter surface properties and shade stability of glazed feldspathic ceramics, though such findings may not reflect the performance of unglazed feldspathic ceramics.