Effect of external staining on the optical properties and surface roughness of monolithic zirconia of different thicknesses

Farzin, Mitra; Ansarifard, Elham; Taghva, Masumeh; Imanpour, Razieh

doi:10.1016/j.prosdent.2021.08.014

Cited by 21 publications

(11 citation statements)

References 35 publications

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“…0.5 mm specimens were prone to color change after repeated firings while there is less color change in specimens with 1 and 1.5 mm thickness. This was consistent with the study of Fathi et al [ 18 ] and Farzin et al [ 27 ] which was reported that color change in thin specimens was more than thick specimens. Color change of thin specimens between firing cycles was above clinically acceptable threshold while color change with thicker veneers after repeated firings is below the threshold.…”

Section: Discussionsupporting

confidence: 93%

Effect of Repeated Firings and Thickness on Optical Properties of Variable Preshaded and Shaded Novel Translucent Zirconia Blocks

Altan

ÇINAR

2022

BioMed Research International

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Objective. The purpose of this study was to examine the optical properties of translucent zirconia with different thickness during multiple firings. Materials and Methods. Three different types of translucent zirconia (Vita YZ HT (HT), Vita YZ ST (ST), Vita YZ XT (XT)) with thickness of 0.5, 1, and 1.5 mm were used in the study. 180 disk-shaped specimens ( n = 10 ) were prepared from preshaded and nonshaded blocks. The coloring liquid (A2, Vita Shade Liquid) was applied with a synthetic nylon brush in the nonshaded group. Then, the specimens were then subjected to 1, 3, and 5 firing times. After consecutive firings, color differences ( Δ E ) and translucency parameter ( TP ) were measured. Statistical analysis was carried out by using repeated measure ANOVA followed by Tukey test. Results. ANOVA analysis reveals that TP and Δ E were significantly affected by the repeated firings. The highest TP was seen in 0.5 mm XT specimen. For all specimens, TP decreases from 1st to 3rd firing cycles, despite TP increases from 3rd to 5th firing cycles. Although there is a significant change in TP values in 0.5 mm thickness, there is no significant change between firing cycles for 1 and 1.5 mm thickness specimens. The highest Δ E value was observed for shaded specimens between 1st and 5th firings. Δ E values were not significantly different between 1 and 3 firings. Conclusions. Changes in thickness and repeated firings of zirconia specimens affected final color and translucency of zirconia specimens. HT blocks are more affected by consecutive firings than ST and XT blocks. Δ E increased as the thicknesses decreased for both types of translucent zirconia specimens tested.

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Section: Discussionsupporting

confidence: 93%

Effect of Repeated Firings and Thickness on Optical Properties of Variable Preshaded and Shaded Novel Translucent Zirconia Blocks

Altan

ÇINAR

2022

BioMed Research International

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“…Similar to glass ceramics, polishing is a more effective finishing procedure to improve the physical properties of the material relative to glazing, creating a smoother surface without affecting the mechanical properties 134–138 . Besides, staining might require an increased number of firing procedures, which for zirconia systems has resulted in alterations in the translucency; however, it is noteworthy that ceramic thickness and block initial translucency has also dictated the effect of multiple firings on the properties of zirconia ceramics 139,140 . Also, extrinsic staining can be damaged or removed by in‐office or external trauma, such as occlusal adjustments, oral function, and toothbrushing 85,141,142 .…”

Section: All‐ceramic Systemsmentioning

confidence: 99%

“…[134][135][136][137][138] Besides, staining might require an increased number of firing procedures, which for zirconia systems has resulted in alterations in the translucency; however, it is noteworthy that ceramic thickness and block initial translucency has also dictated the effect of multiple firings on the properties of zirconia ceramics. 139,140 Also, extrinsic staining can be damaged or removed by in-office or external trauma, such as occlusal adjustments, oral function, and toothbrushing. 85,141,142 Previous findings have indicated that toothbrushing extrinsically stained zirconia restorations led to a significant alteration in the translucency and shade in up to 15-year simulations.…”

Section: Polycrystalline Ceramicsmentioning

confidence: 99%

Indirect restorative systems—A narrative review

Bonfante

Calamita

Bergamo

2023

J Esthet Restor Dent

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Objective: The background and clinical understanding of the properties of currently available indirect restorative systems and fabrication methods is, along with manufacturer and evidence-based literature, an important starting point to guide the clinical selection of materials for tooth and/or implant supported reconstructions. Therefore, this review explores most indirect restorative systems available in the market, especially all-ceramic, along with aspects of manufacturing process, clinical survival rates, and esthetic outcomes. Overview: Progressive incorporation of new technologies in the dental field and advancements in materials science have enabled the development/improvement of indirect restorative systems and treatment concepts in oral rehabilitation, resulting in reliable and predictable workflows and successful esthetic and functional outcomes. Indirect restorative systems have evolved from metal ceramics and polymers to glass ceramics, polycrystalline ceramics, and resin-matrix ceramics, aiming to improve not only biological and mechanical properties, but especially the optical properties and esthetic quality of the reconstructions, in attempt to mimic natural teeth. Conclusions: Based on several clinical research, materials, and patient-related parameters, a decision tree for the selection of indirect restorative materials was suggested to guide clinicians in the rehabilitation process. Clinical Significance: The pace of materials development is faster than that of clinical research aimed to support their use. Since no single material provides an ideal solution to every case, professionals must continuously seek information from well designed, long-term clinical trials in order to incorporate or not new materials and technological advancements.

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“…The human eye has certain limitations in recognizing colors and images [41]. The optical values (L*, a*, and b*) of teeth and materials can be accurately recorded using a dental colorimeter [42]. Colors can be digitized to assist in clinical dental applications.…”

Section: Evaluation Of Optical Propertiesmentioning

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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Effect of external staining on the optical properties and surface roughness of monolithic zirconia of different thicknesses

Cited by 21 publications

References 35 publications

Effect of Repeated Firings and Thickness on Optical Properties of Variable Preshaded and Shaded Novel Translucent Zirconia Blocks

Effect of Repeated Firings and Thickness on Optical Properties of Variable Preshaded and Shaded Novel Translucent Zirconia Blocks

Indirect restorative systems—A narrative review

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

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