Extended glaze firings for porcelain-veneered zirconia: Effects on the mechanical and optical behavior

Rodrigues, Camila da Silva; Aurélio, Iana Lamadrid; Fraga, Sara; Kaizer, Marina R.; May, Liliana Gressler

doi:10.1016/j.dental.2021.03.009

Cited by 6 publications

(2 citation statements)

References 55 publications

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“…Previous studies have shown that even dental ceramics are prone to color alteration by staining [24][25][26]. However, the color difference can be calculated from other situations that restorative materials are subjected to, such as thermal [21,37] or surface treatments [38]. Even though our conclusions might be cautiously inferred for color difference analyses other than by staining, more studies on this topic (background effect) are encouraged.…”

Section: Discussionmentioning

confidence: 87%

Colorimetric analysis of dental porcelains: effects of the background color

Rodrigues

Lenz²,

May

et al. 2022

Cerâmica

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This study evaluated how the background (white or gray) affects the color parameter measurements and color difference calculations (∆E ab and ∆E 00 ) of dental ceramics. Disc-shaped feldspathic ceramic specimens were prepared with two shades (enamel and dentin) and stained in red wine (7-day immersion). A spectrophotometer was used to perform color measurements (CIEL*a*b* coordinates) over gray and white backgrounds after the specimen preparation and after staining. The color difference was calculated with CIEDE2000 (ΔE 00 ) and CIELAB (ΔE ab ) formulae. Initial L*a*b* coordinates, ΔE 00 , and ΔE ab data were analyzed with t-tests separately for each ceramic shade. White background led to higher values of L* and b* coordinates from the enamel shade, and of L*, a*, and b* coordinates from the dentin shade. However, ΔE 00 and ΔE ab results from white and gray backgrounds were similar in both ceramic shades. Therefore, background color did not affect the color difference results of the slightly stained feldspathic ceramic samples.

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Section: Discussionmentioning

confidence: 87%

Colorimetric analysis of dental porcelains: effects of the background color

Rodrigues

Lenz²,

May

et al. 2022

Cerâmica

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“…Zirconia is prepared using digital computer-aided design (CAD) and computer-aided manufacturing (CAM). However, the poor transparency of zirconia still needs to rely on a method of stacking ceramics to overcome the requirement of color restoration [18]. Glass-ceramics were initially produced using traditional lost wax casting and hot pressing [19,20].…”

Section: Introductionmentioning

confidence: 99%

In Vivo Evaluation of the Effects of Sintering Temperature on the Optical Properties of Dental Glass-Ceramics

Fan

Lin

Tsao³

et al. 2022

Nanomaterials

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In prosthodontics, the ability of glass-ceramics to express the optical properties of natural teeth is an important goal of esthetic restorations. Dental restorations do not merely need to be similar in color to natural teeth; proper optical properties, such as opalescence, transparency, etc., must be combined in order to achieve excellent esthetic effects. The optical properties of ceramic materials are mainly distinguished by different hues (e.g., A, B, C, and D) combined with translucency (e.g., high translucency (HT), medium translucency (MT), low translucency (LT), and medium opacity (MO)). However, there are many varieties of tooth color. Therefore, it is expected that glass-ceramics can change their nanocrystal size and porosity through different heat-treatment temperatures and times and, thereby, present different transparency effects. This study mainly analyzed the influence of changes in sintering temperature on the optical properties of glass-ceramics. The optical properties of glass-ceramics in the oral cavity were evaluated with human trials. We hypothesized that (1) the transparency of glass-ceramics can be changed by controlling the sintering temperature and (2) glass-ceramics modified by the sintering temperature can be suitable for clinical applications. Results showed that the transparency decreased, the nanoparticle size increased, the crystallinity increased, and the surface hardness decreased as the sintering temperature increased. High-brightness glass-ceramics have more-sensitive optical properties. Results of clinical trials showed that glass-ceramics whose transparency was changed by controlling the sintering temperature can be candidates for clinical applications. Based on the above results, the hypotheses of this study were supported. In the future, we will continue to explore the esthetic field of dental restorations.

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