Transmittance of visible and blue light through zirconia

Liebermann, Anja; Rafael, Caroline Freitas; Kauling, Ana Elisa Colle; Edelhoff, Daniel; Ueda, Ken–ichi; Seiffert, Andreas; Volpato, Cláudıa Ângela Mazıero; Güth, Jan‐Frederik

doi:10.4012/dmj.2016-287

Cited by 10 publications

(16 citation statements)

References 25 publications

(48 reference statements)

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“…It has been reported that lowering the amount of alumina addition from 0.25 to 0.1 or 0.05 wt.% can significantly increase the translucency. Although alumina elimination improves translucency [17], it requires higher sintering temperatures (>1500 °C) in conjunction with a longer dwell time (6 h) which increases significantly the grain size leading sequentially to reduced translucency [18,19]. Another strategy recently developed by Zhang et al [20,21] to synthesize highly-translucent, strong and aging-resistant zirconia is doping with trivalent ions with larger radius compare to Zr 4+ , that segregate at grain boundaries.…”

Section: Optical Propertiesmentioning

confidence: 99%

Monolithic Zirconia: An Update to Current Knowledge. Optical Properties, Wear, and Clinical Performance

Rigos²,

et al. 2019

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The purpose of this paper was to update the knowledge concerning the wear, translucency, as well as clinical performance of monolithic zirconia ceramics, aiming at highlighting their advantages and weaknesses through data presented in recent literature. New ultra-translucent and multicolor monolithic zirconia ceramics present considerably improved aesthetics and translucency, which, according to the literature reviewed, is similar to those of the more translucent lithium disilicate ceramics. A profound advantage is their high strength at thin geometries preserving their mechanical integrity. Based on the reviewed articles, monolithic zirconia ceramics cause minimal wear of antagonists, especially if appropriately polished, although no evidence still exists regarding the ultra-translucent compositions. Concerning the survival of monolithic zirconia restorations, the present review demonstrates the findings of the existing short-term studies, which reveal promising results after evaluating their performance for up to 5 or 7 years. Although a significant increase in translucency has been achieved, new translucent monolithic zirconia ceramics have to be further evaluated both in vitro and in vivo for their long-term potential to preserve their outstanding properties. Due to limited studies evaluating the wear properties of ultra-translucent material, no sound conclusions can be made, whereas well-designed clinical studies are urgently needed to enlighten issues of prognosis and long-term survival.

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Section: Optical Propertiesmentioning

confidence: 99%

Monolithic Zirconia: An Update to Current Knowledge. Optical Properties, Wear, and Clinical Performance

Rigos²,

et al. 2019

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“…The explanations for this change in properties of the light-cured resin cement under thicker ceramics may be related to the reduction of the light transmitted by the light-curing unit when crossing a 2 mm thick ceramic 22 . According to Liebermann et al 23 (2018), light transmittance is inversely related to the thickness of the ceramic, which will be crossed by the light beam. That is, the thicker the material, the lower the transmittance of that light 22,23 .…”

Section: Discussionmentioning

confidence: 99%

“…According to Liebermann et al 23 (2018), light transmittance is inversely related to the thickness of the ceramic, which will be crossed by the light beam. That is, the thicker the material, the lower the transmittance of that light 22,23 . Transmittance can be defined as the amount of light that passes through a material, part of which is reflected or absorbed 23 .…”

Section: Discussionmentioning

confidence: 99%

“…That is, the thicker the material, the lower the transmittance of that light 22,23 . Transmittance can be defined as the amount of light that passes through a material, part of which is reflected or absorbed 23 . If a small part of this light is scattered and most of it is transmitted through the material, higher transmittance values will be achieved 22,23 .…”

Section: Discussionmentioning

confidence: 99%

“…Transmittance can be defined as the amount of light that passes through a material, part of which is reflected or absorbed 23 . If a small part of this light is scattered and most of it is transmitted through the material, higher transmittance values will be achieved 22,23 . In a ceramic material, the light ends up being too dispersed and diffusely reflected, generating an opaque appearance 22,23 .…”

Section: Discussionmentioning

confidence: 99%

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Effect of ceramic thicknesses and opacities on water sorption and solubility of a light-curing resin cement by different units

Cerqueira

Souza²,

Gomes³

et al. 2021

Braz. J. Oral Sci.

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Aim: This study evaluated the water sorption and solubility of a light-cured resin cement, under four thicknesses and four opacities of a lithium disilicate ceramic, also considering three light-emitting diode (LED) units. Methods: A total of 288 specimens of a resin cement (AllCem Veneer Trans – FGM) were prepared, 96 samples were light-cured by each of the three light curing units (Valo – Ultradent / Radii-Cal – SDI / Bluephase II – Ivoclar Vivadent), divided into 16 experimental conditions, according to the opacities of the ceramic: High Opacity (HO), Medium Opacity (MO), Low Translucency (LT), High Translucency (HT), and thicknesses (0.3, 0.8, 1.5, and 2.0 mm) (n = 6). The specimens were weighed at three different times: Mass M1 (after making the specimens), M2 (after 7 days of storage in water), and M3 (after dissection cycle), for calculating water sorption and solubility. Results: The higher thickness of the ceramic (2.0 mm) significantly increased the values of water sorption (44.0± 4.0) and solubility (7.8±0.6), compared to lower thicknesses. Also, the ceramic of higher opacity (HO) generated the highest values of sorption and solubility when compared to the other opacities, regardless of the thickness tested (ANOVA-3 factors / Tukey’s test, α = 0.05). There was no influence of light curing units. Conclusion: Higher thicknesses and opacities of the ceramic increased the water sorption and solubility of the tested light-cured resin cement.

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Translucency of Monolithic Zirconia after Hydrothermal Aging: A Review of In Vitro Studies

Papageorgiou-Kyrana¹,

Fasoula

Kontonasaki

2020

Journal of Prosthodontics

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PurposeRecent modifications in composition, structure, and fabrication methods have led to monolithic zirconia ceramics of superior translucency. However, during aging, intrinsic microstructural features, such as grain boundaries and pores, may affect light scattering and consequently the translucency of zirconia. The aim of this study was to systematically review if hydrothermal aging affects the translucency of monolithic zirconia.Materials and MethodsAn electronic search in Medline and Scopus was conducted to identify the effect of hydrothermal aging on the translucency of zirconia. The search was limited to English‐language publications and in vitro studies. The following search terms were used alone or in combination: “monolithic zirconia,” “full contour zirconia,” “Y‐TZP zirconia,” “tetragonal zirconia,” “cubic zirconia,” “aging,” “hydrothermal aging,” “steam autoclave,” “translucency,” “translucency parameter,” and “contrast ratio.” From the titles found after searching the electronic databases, only 10 articles met the inclusion criteria and were included in this review. The translucency parameter or total transmittance was used to extract data from the studies.ResultsAging reduced the translucency of monolithic zirconia in most of the studies; however, the differences varied according to the brand tested and the microstructure and thickness of the specimens. The thinner specimens presented higher translucency alterations. Although in all studies a change in translucency was recorded, its mean values suggest that the differences are within the acceptability threshold in most cases, independent of the color system used to calculate translucent parameter, so they are clinically undetectable. For longer aging times, beyond the perspective clinical life of the restorations, the change in translucency is higher than the acceptability threshold.ConclusionsThere is a controversy regarding how aging affects the translucency of monolithic zirconia ceramics; however, this may not be clinically important, as in most cases, changes (either decrease or increase) in translucency were within the acceptability thresholds.

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Transmittance of visible and blue light through zirconia

Cited by 10 publications

References 25 publications

Monolithic Zirconia: An Update to Current Knowledge. Optical Properties, Wear, and Clinical Performance

Monolithic Zirconia: An Update to Current Knowledge. Optical Properties, Wear, and Clinical Performance

Effect of ceramic thicknesses and opacities on water sorption and solubility of a light-curing resin cement by different units

Translucency of Monolithic Zirconia after Hydrothermal Aging: A Review of In Vitro Studies

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