Effect of thermocycling on roughness of nanofill, microfill and microhybrid composites

Santos, Paulo Henrique dos; Catelan, Anderson; Guedes, Ana Paula Albuquerque; Suzuki, Thaís Yumi Umeda; Godas, André Gustavo de Lima; Briso, André Luiz Fraga; Bedran-Russo, Ana K.

doi:10.3109/00016357.2014.971868

Cited by 22 publications

(27 citation statements)

References 18 publications

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“…The variation of filler exposure after thermal cycling is probably due to matrix degradation, which causes the exposure of the filler particles within and thus, results in higher roughness values . Several investigations have focused on the effects of thermocycling on microhardness, roughness, and color of composite restorations . Dos Santos and colleagues reported that 3,000 thermal cycles increased roughness values for all resin‐based composites and there was a tendency for reduced surface roughness values after 10,000 thermal cycles.…”

Section: Discussionmentioning

confidence: 99%

Effects of Novel Finishing and Polishing Systems on Surface Roughness and Morphology of Nanocomposites

Aytaç

Karaarslan

Ağaccıoğlu

et al. 2016

J Esthet Restor Dent

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Section: Discussionmentioning

confidence: 99%

Effects of Novel Finishing and Polishing Systems on Surface Roughness and Morphology of Nanocomposites

Aytaç

Karaarslan

Ağaccıoğlu

et al. 2016

J Esthet Restor Dent

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“…Thermocycling is a popular method of artificial accelerated aging of ceramics because it reproduces the oral environment as an extrinsic factor [24][25][26]. The water aging method includes standardized thermal variations with baths ranging from 5 to 55 • C for several cycles.…”

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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“…As a result of these changes, mechanical stresses and crack formations occur [26]. In literature, bath temperature and a number of cycles have not been standardized, but a short dwell of 15-20 s represents the changes in temperature in the oral environment [27][28][29]. Longer exposure times are not well tolerated [30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermocycling and Surface Treatments on the Surface Roughness and Microhardness of Three Heat-Pressed Ceramics Systems

et al. 2020

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Dental ceramic restorations are widely used in restorative dentistry. However, these restorations can be affected once cemented in the oral cavity by several factors. How can conventional surface treatments, such as glazing and mechanical polishing, diminish the effects of aging? The purpose of this in vitro study was to evaluate the effect of thermocycling and conventional surface treatments on the surface roughness and microhardness of three types of glass-ceramics by using a profilometer, scanning electron microscopy (SEM), atomic force microscopy (AFM), and a microhardness tester. Three types of ceramic systems (zirconia reinforced lithium silicate glass-ceramic, lithium disilicate glass-ceramic, and feldspathic glass-ceramic) (n = 48) were prepared. The samples were subjected to thermocycling for 10,000 cycles. Surface roughness was evaluated numerically using a profilometer and visually by using SEM and AFM. Microhardness was performed using a microhardness tester. The data were interpreted using the ANOVA test, and the results were correlated using Pearson’s correlation formula (r). Significant differences were found before and after thermocycling for the Ra (p < 0.01) and Rz (p < 0.05) parameters. As well, differences between glazed and polished surfaces were significant before and after thermocycling for surface roughness and microhardness (p < 0.05). A correlation was made between average surface roughness and microhardness (r = −460) and for the maximum surface roughness and microhardness (r = −606). Aging increases the roughness and decreases in time the microhardness. The tested ceramic systems behaved differently to the aging and surface treatments. Surface treatments had a significant impact on the microhardness and surface characteristics. The glazed groups were reported with higher surface roughness and lower microhardness when compared to the polished groups before and after thermocycling. The measuring roughness techniques determine the scale-dependent values for the Ra (Sa) and Rz (Sq) parameters. Thermocycling almost doubled the surface roughness for all the tested samples. Microhardness decreased only for the Celtra glazed samples. Nano-roughness increased the values for Vita and slightly for Emax. Thermocycling had little effect on Emax ceramic and a more significant impact on Celtra Press ceramic.

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Effect of thermocycling on roughness of nanofill, microfill and microhybrid composites

Cited by 22 publications

References 18 publications

Effects of Novel Finishing and Polishing Systems on Surface Roughness and Morphology of Nanocomposites

Effects of Novel Finishing and Polishing Systems on Surface Roughness and Morphology of Nanocomposites

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

The Effect of Thermocycling and Surface Treatments on the Surface Roughness and Microhardness of Three Heat-Pressed Ceramics Systems

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