In-vitro wear of natural tooth surface opposed with zirconia reinforced lithium silicate glass ceramic after accelerated ageing

Fathy, Salma M.; Swain, Michael V.

doi:10.1016/j.dental.2017.12.010

Cited by 38 publications

(17 citation statements)

References 36 publications

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“…To date, as regards mechanical properties and clinical performances of ZLS, data are still limited, often controversial and short-term; these highly promising ceramics need further studies, both in vitro and in vivo, in order to precisely define physical-mechanical properties, clinical indications, limits and long-term performance of such restorations [114][115][116][117].…”

Section: Zirconia Reinforced-lithium Silicate Ceramics (Zls)mentioning

confidence: 99%

Current status on lithium disilicate and zirconia: a narrative review

et al. 2019

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Background: The introduction of the new generation of particle-filled and high strength ceramics, hybrid composites and technopolymers in the last decade has offered an extensive palette of dental materials broadening the clinical indications in fixed prosthodontics, in the light of minimally invasive dentistry dictates. Moreover, last years have seen a dramatic increase in the patients' demand for non-metallic materials, sometimes induced by metal-phobia or alleged allergies. Therefore, the attention of scientific research has been progressively focusing on such materials, particularly on lithium disilicate and zirconia, in order to shed light on properties, indications and limitations of the new protagonists of the prosthetic scene. Methods: This article is aimed at providing a narrative review regarding the state-of-the-art in the field of these popular ceramic materials, as to their physical-chemical, mechanical and optical properties, as well as to the proper dental applications, by means of scientific literature analysis and with reference to the authors' clinical experience. Results: A huge amount of data, sometimes conflicting, is available today. Both in vitro and in vivo studies pointed out the outstanding peculiarities of lithium disilicate and zirconia: unparalleled optical and esthetic properties, together with high biocompatibility, high mechanical resistance, reduced thickness and favorable wear behavior have been increasingly orientating the clinicians' choice toward such ceramics. Conclusions: The noticeable properties and versatility make lithium disilicate and zirconia materials of choice for modern prosthetic dentistry, requiring high esthetic and mechanical performances combined with a minimal invasive approach, so that the utilization of such metal-free ceramics has become more and more widespread over time.

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Section: Zirconia Reinforced-lithium Silicate Ceramics (Zls)mentioning

confidence: 99%

Current status on lithium disilicate and zirconia: a narrative review

et al. 2019

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“…12,13 In addition, these materials have optical and physical properties that are comparable to those of lithium disilicate 12,13 and fulfill the esthetic requirements through their enhanced translucency and different shade options. 11 The roughness, smoothness and surface quality of a restoration material is important for ensuring a desired esthetic appearance and longterm clinical succes 14,15 because rough surfaces have an impact on discoloration 16 , shade matching 17 , plaque accumulation, wear against opposite restoration materials or teeth, 18 and the tactile perception of the patient. 19 Well-finished surfaces were reported to cause fewer technical and esthetic problems by providing the material with tougher, glossier, and more stable translucency 3 and color.…”

Section: Introductionmentioning

confidence: 99%

“…22 The surface roughness of the restoration materials is affected by different factors and conditions. 17,18 A clinically acceptable Ra threshold for prostheses was reported to be 0.2 µm. 23 Excessive microbial adhesion and plaque formation occur when Ra>0.2 µm.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Finishing Methods and Aging on Surface Roughness and Optical Properties of Zirconia-Reinforced Lithium Silicate Glass-Ceramic

Alp

Subaşı

2019

Cumhuriyet Dental Journal

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Objectives: The effects of three different surface finishing methods and aging on the surface roughness and optical properties of zirconia-reinforced lithium silicate (ZLS) glass-ceramic were investigated. Materials and Methods: Rectangular specimens (0.6 mm thickness) were sliced from ZLS blocks (N=36). Three different types of surface finishing [glazing combined with crystallization (ZLS-CF) or after crystallization (ZLS-G) and polishing (ZLS-P)] (n=12) and 5000 thermocycles were applied. Three sets of measurements were performed before and after aging to determine the color coordinates and surface roughness (Ra) by using a colorimeter and profilometer, respectively. The mean surface roughness (Ra) values were calculated. Color differences and translucency parameter (TP) values were calculated using the color difference ΔEab and TP formulas. One-way ANOVA was used to analyze the color difference, translucency, and surface roughness values (α=.05). Results: Significant differences in the ΔE values were not observed (p=.736) for specimens with different types of surface finishing. A significant difference was observed between the translucency values for different surface finishing groups before aging (p<.001). A significant difference in the surface roughness data between samples with different kinds of surface finishing was observed both before and after aging (p<.001). The ZLS-P group exhibited lowest surface roughness values before and after aging (p<.001). A positive significant correlation between the ΔE and translucency change values was observed in both the ZLS-G (p=.005) and ZLS-P (p<.001) groups. Conclusions: The surface finishing type did not affect the color change of ZLS glass-ceramic. The translucency values for different surface finished ZLS glassceramic specimens changed before aging. After aging, the surface finishing did not affect the translucency of ZLS glass-ceramic. All tested groups exhibited surface roughness values higher than the plaque accumulation threshold (Ra=0.2 mm).

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“…Since the microstructure is influenced by the relation between crystalline phase and glassy matrix, any surface or subsurface defect can aggravate wear by fatigue process. Thus, reinforcing the importance a smooth surface to maintain the integrity and texture of the ceramic (25). This can justify the difference in roughness between both tested ceramics, allowing more shear between LD and the antagonist, consequently increasing the wear and volume loss.…”

Section: Discussionmentioning

confidence: 79%

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

et al. 2019

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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.

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In-vitro wear of natural tooth surface opposed with zirconia reinforced lithium silicate glass ceramic after accelerated ageing

Cited by 38 publications

References 36 publications

Current status on lithium disilicate and zirconia: a narrative review

Current status on lithium disilicate and zirconia: a narrative review

Effect of Surface Finishing Methods and Aging on Surface Roughness and Optical Properties of Zirconia-Reinforced Lithium Silicate Glass-Ceramic

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

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