Effect of brushing and thermocycling on the shade and surface roughness of CAD-CAM ceramic restorations

Yuan, Judy Chia Chun; Barão, Valentim Adelino Ricardo; Wee, Alvin G.; Alfaro, Maria F.; Afshari, Fatemeh S.; Sukotjo, Cortino

doi:10.1016/j.prosdent.2017.06.001

Cited by 88 publications

(85 citation statements)

References 46 publications

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“…It helps the researcher save time by detecting the amount of material degradation in the thermal cycle within a shorter period of time, while the researcher gains information about the material. [27][28][29][30] In this in vitro study, three different CAD/CAM material samples were compared in terms of color stability. The last stage, i.e.…”

Section: Discussionmentioning

confidence: 99%

Effect of surface finishing treatments on the color stability of CAD/CAM materials

2020

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The aim of this study was to evaluate the effect of different surface finishing processes on the color stabilities of lithium disilicate glass-ceramics, zirconia-reinforced lithium silicate ceramics, and resin nanoceramics after artificial ageing. MATERIALS AND METHODS. 216 samples were prepared from 3 different CAD/CAM materials (LAVA Ultimate, IPS e.max CAD, VITA Suprinity) with A1 HT color at a size of 14 × 12 mm and a thickness of 0.5 ± 0.05 mm. Color measurements of the samples were performed with a spectrophotometer using color parameters and CIE Lab color system on a gray backing between baseline color and after 5000 cycles of artificial ageing in 4 stages (i.e. the first measurement before the treatment, the second measurement after polishing, the third measurement after cement application, and the fourth measurement after artificial ageing). The results were evaluated using the Variance analysis and Fisher's LSD test. RESULTS. Resin nanoceramics (LU) exhibited higher color change values than zirconia-reinforced lithium silicate (VS) and lithium disilicate (EC) ceramics after artificial ageing. Manual polishing and glazing resulted in similar color change for LU and VS (P>.05). In the EC group, glazing provided statistically different results as compared to the manual polishing and control groups (P<.05). Among the ceramic groups, color change values of the subgroup, which was treated by glazing, of the zirconia-reinforced lithium silicate (VS) and lithium disilicate (EC) samples were below the clinically acceptable level (ΔE < 3.5). CONCLUSION. The lowest color change for all stages was observed in Vita Suprinity.

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Section: Discussionmentioning

confidence: 99%

Effect of surface finishing treatments on the color stability of CAD/CAM materials

2020

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“…The water aging method includes standardized thermal variations with baths ranging from 5 to 55 • C for several cycles. The thermocycling method can affect the longevity of the restoration and using it can simulate the behaviour of the ceramic material in the oral environment [27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermocycling, Surface Treatments and Microstructure on the Optical Properties and Roughness of CAD-CAM and Heat-Pressed Glass Ceramics

2020

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Dental ceramic restorations are widely spread nowadays due to their aesthetics and biocompatibility. In time, the colour and structure of these ceramic materials can be altered by aging processes. How does artificial aging affect the optical and surface roughness of ceramics? This study aims to assess the effect of thermocycling, surface treatments and microstructure upon translucency, opalescence and surface roughness on CAD-CAM and heat-pressed glass-ceramic. Forty-eight samples (1.5 mm thickness) were fabricated from six types of A2 MT ceramic: heat-pressed and milled glass-ceramic (feldspathic, lithium disilicate and zirconia reinforced lithium silicate). The samples were obtained respecting the manufacturer’s instructions. The resulted surfaces (n = 96) were half glazed and half polished. The samples were subjected to thermocycling (10,000 cycles) and roughness values (Ra and Rz), colour coordinates (L*, a*, b*) and microstructural analyses were assessed before and after thermocycling. Translucency (TP) and opalescence (OP) were calculated. Values were statistically analysed using ANOVA test (one way). TP and OP values were significantly different between heat-pressed and milled ceramics before and also after thermocycling (p < 0.001). Surface treatments (glazing and polishing) had a significant effect on TP and OP and surface roughness (p < 0.05). The heat-pressed and milled zirconia reinforced lithium silicate glass-ceramic experienced a loss in TP and OP. Ra and Rz increased for the glazed samples, TP and OP decreased for all the samples after thermocycling. Microstructural analyse revealed that glazed surfaces were more affected by the thermocycling and especially for the zirconia reinforced lithium silicate ceramic. Optical properties and surface roughness of the chosen ceramic materials were affected by thermocycling, surface treatments and microstructural differences. The least affected of the ceramics was the lithium disilicate ceramic heat-pressed polished and glazed.

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“…For all groups, it can be noticed an increase in surface roughness after the fourth firing, statistically significant in CO and DC groups. The high‐temperature firing possibly induces thermal deformation of the ceramic material, which slightly increases the roughness, interfering with the accumulation of bacterial biofilm and may lead to periodontal disease . In addition, rougher surfaces may increase the susceptibility of staining of restorative materials …”

Section: Discussionmentioning

confidence: 99%

Effect of staining and repeated firing on the surface and optical properties of lithium disilicate

Miranda

Barcellos

MartinelliLobo

et al. 2019

J Esthet Restor Dent

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Objective: Evaluate the effect of staining and repeated firings on color, translucency and surface proprieties of CAD/CAM lithium disilicate (LD).Material and Methods: One hundred eighty LD discs were made (ISO 6872) and distributed in different groups (n = 20): control (CO)-no treatment; single-step characterization (SC)-crystallization and staining fired together; and double step characterization (DC)-crystallization and then staining. The samples were submitted to two, four, or six firings, resulting in nine groups: COII, COIV, COVI, SCII, SCIV, SCVI, DCII, DCIV, and DCVI. The color and translucency were measured by a reflectance spectrophotometer. Surface roughness (Ra) and Vickers nano-hardness were also measured. ANOVA and Tukey statistical tests were used (α = .05). Results:Only CO and DC demonstrated significant color alterations (ΔE 00 > 1.8). SC and DC did not show changes in translucency by the number of firings (P > .05); however, for CO (P = .02) these values increased. Nano-hardness was similar in all groups (P > .05). Ra values indicated differences due to the type of characterization (SC presented the highest values) and number of firings (CO and DC groups) (P < .01).Conclusion: SC promoted color, translucency, and roughness stability after repeated firings.Clinical Significance: The single characterization technic in CAD/CAM lithium disilicate presents good color, translucency, and hardness stability, which promote predictable results to monolithic restoration. K E Y W O R D Scolor, lithium disilicate, repeated firing, roughness, translucency

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Effect of brushing and thermocycling on the shade and surface roughness of CAD-CAM ceramic restorations

Cited by 88 publications

References 46 publications

Effect of surface finishing treatments on the color stability of CAD/CAM materials

Effect of surface finishing treatments on the color stability of CAD/CAM materials

Effect of Thermocycling, Surface Treatments and Microstructure on the Optical Properties and Roughness of CAD-CAM and Heat-Pressed Glass Ceramics

Effect of staining and repeated firing on the surface and optical properties of lithium disilicate

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