Wear resistance and abrasiveness of CAD-CAM monolithic materials

Ludovichetti, Francesco Saverio; Trindade, Flávia Zardo; Werner, A.; Kleverlaan, Cornelis J.; Fonseca, Renata Garcia

doi:10.1016/j.prosdent.2018.05.011

Cited by 117 publications

(120 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is a benefit for the antagonist's teeth because it produces less wear. Differences in surface roughness of materials were also found in a similar study [54]. These results show that mechanical polishing can result in lower Ra and Rz values before and after thermocycling, resulting in reduced microbial adhesion.…”

Section: Discussionsupporting

confidence: 80%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 80%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Ludovichetti et al (15) used two-body wear test with ACTA wear machine for 200,000 cycles and determined the wear rate with a surface profilometer. The authors did not found statistically difference between ZLS and LD for wear against bovine enamel.…”

Section: Discussionmentioning

confidence: 99%

“…All specimens were then individually embedded in autopolymerizing acrylic resin cylinder, leaving the top of each disc uncovered. Thus, the samples were submitted to the wear simulator (Biocylce V2, Biopdi, São Carlos, SP, Brazil) with 2 mm steatite pistons (magnesium silicate, Ceramica Chiarotti, Jaguariúna, SP, Brazil), which served as analogue to dental enamel antagonist (15)(16)(17). The wear simulator operates by applying a vertical load on the specimen, sliding horizontally, and then repeating the cycle (16).…”

Section: Wear Simulationmentioning

confidence: 99%

Reinforced Glass-ceramics: Parametric Inspection of Three-Dimensional Wear and Volumetric Loss after Chewing Simulation

et al. 2019

View full text Add to dashboard Cite

The aim of this study was to investigate the three-dimensional wear, volumetric loss and surface roughness after chewing simulation of two glass ceramics. Lithium disilicate (LD, Emax CAD, Ivoclar) and Zirconia reinforced lithium silicate (ZLS, Vita Suprinity, Vita Zhanfabrick) discs (n=20/g) were scanned to obtain stereolithography (STL) files for each sample. All discs were submitted to chewing simulation with sliding configuration (30 N, 300,000 cycles, 6 mm and 1.7 Hz) with steatite as antagonist. The samples were then scanned again and the volume loss and the deepest defect depth was measured using the superimposed file from the baseline using three-dimensional digital parametric inspection software (GOM Inspect, Braunschweig, Germany). Surface roughness (Ra and Rz) was analyzed with a contact profilometer. Data were analyzed by one-way ANOVA and Tukey test (α=0.5%). ANOVA showed significant differences among the groups. Considering the ceramic volume loss, wear depth defect length and Rz roughness, LD (-22.09±5.57%; 0.80±0.06 µm; 3.08±1.02 µm) showed higher mean values than ZLS (-15.67±4.51%; 0.56±0.09 µm; 1.51±0.90 µm). Ra mean values were similar for both materials (p=0.064). All discs exhibited slight surface scratches along with the sliding direction with pitted wear patterns, while large cracks were observed on wear traces. These same areas can be identified in blue, overlapping the STL files before and after chewing simulation in inspection software. The linear reduction generated by sliding contact shows a graph with a similar wear pattern shape. ZLS was more resistant to wear than LD, with less volume loss and shallower surface defects.

show abstract

“…In addition, the adhesive bond between the veneer layer and the zirconia coping allows the use of polymer‐containing materials, such as the PIRGN tested here, and also of conventional resin composite CAD/CAM blocks. The combination of a stiff zirconia framework with a resin composite veneer has shown a mechanical performance comparable with that of glassy veneers but reduced wear on the enamel antagonist . On the other hand, this technology faces important esthetic limitations as a result of the monochromatic color features of the CAD/CAM blocks.…”

Section: Discussionmentioning

confidence: 99%

In vitro lifetime of zirconium dioxide‐based crowns veneered using Rapid Layer Technology

Riedel

Wendler

Belli

et al. 2019

European J Oral Sciences

View full text Add to dashboard Cite

Rapid Layer Technology (RLT) uses computer‐aided design/computer‐aided manufacturing (CAD/CAM) to manufacture a veneer layer that is adhesively bonded to the zirconia framework, avoiding firing steps during the fabrication process and thus preventing build‐up of residual stresses. This work studied, using sliding contact fatigue, the in vitro lifetime of restorations produced using RLT compared with restorations produced using conventional veneering techniques. Zirconia copings were veneered with a conventional hand‐layering method (VM9) using a fast (n = 16) or a slow (n = 16) cooling protocol, or with RLT. For the latter, the veneers were CAD/CAM fabricated using a feldspathic reinforced‐glass (Vitablocs Mark II; n = 16) or a polymer‐infiltrated reinforced‐glass network (Enamic; n = 16) and adhesively bonded to the zirconia frameworks. Crowns thus obtained were submitted to sliding contact fatigue against a steatite indenter in a chewing simulator until failure. A Kaplan–Meier survival analysis was conducted. None of the hand‐layered restorations survived after a 2 × 106‐cycle interval, whereas no fractures in the RLT groups were observed. Vitablocs Mark II veneers survived for a longer testing period (3.5 × 106 cycles) than their Enamic counterparts (2.5 × 106 cycles) owing to their superior wear behavior. The RLT represents an efficient method to veneer zirconia frameworks by reducing processing steps and, more importantly, increasing the lifetime of the restorations.

show abstract

Wear resistance and abrasiveness of CAD-CAM monolithic materials

Cited by 117 publications

References 27 publications

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

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

Reinforced Glass-ceramics: Parametric Inspection of Three-Dimensional Wear and Volumetric Loss after Chewing Simulation

In vitro lifetime of zirconium dioxide‐based crowns veneered using Rapid Layer Technology

Contact Info

Product

Resources

About