Corrosion effect on the flexural strength &amp;amp; micro-hardness of ips e-max ceramics

Mohsen, Cherif A.

doi:10.4236/ojst.2011.12006

Cited by 15 publications

(20 citation statements)

References 17 publications

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“…This in turn leads to plaque accumulation, secondary caries, and periodontal inflammation. Corrosion can also lead to discoloration of the restoration and a decrease in fracture strength of the glass-ceramic [13,14,51]. The results of this study demonstrated that SiC coating is an effective approach to improve the chemical stability of glass-ceramic materials by minimizing corrosion and maintaining a smoother surface (Figures 1, 2 and 4).…”

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

“…In conclusion, SiC is a novel coating that holds promise for improving the performance of ceramic materials used for dental applications.Materials 2020, 13, 1215 2 of 11 substances pH 8-14 (e.g., spinach, soybeans, and antacids) [1]. Eventually, this constant change in pH can decrease the fracture strength of glass-ceramics [13,14] and increase surface roughness [15,16]. This roughening of the restoration can lead to plaque accumulation and increased wear of the opposing enamel [17,18].…”

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confidence: 99%

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Novel Coating to Minimize Corrosion of Glass-Ceramics for Dental Applications

et al. 2020

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The effect of a novel silicon carbide (SiC) coating on the chemical durability of a fluorapatite glass-ceramic veneer was investigated by examining weight loss and ion release levels. The hypothesis that this novel coating will exhibit significant corrosion resistance was tested. Inductively coupled plasma atomic emission spectrometer (ICP) was used for ion concentration determination and scanning electron microscopy (SEM) for surface morphology analyses. Samples were immersed in pH 10 and pH 2 buffer solutions to represent extreme conditions in the oral cavity. Analyses were done at 15 and 30 days. The SiC coated group demonstrated significant reduction in weight loss across all solutions and time points (p < 0.0001). Ion release analyses demonstrated either a marginally lower or a significantly lower release of ions for the SiC-coated disks. SEM analysis reveals planarization of surfaces by the SiC-coated group. The surfaces of coated samples were not as corroded as the non-coated samples, which is indicative of the protective nature of these coatings. In conclusion, SiC is a novel coating that holds promise for improving the performance of ceramic materials used for dental applications.Materials 2020, 13, 1215 2 of 11 substances pH 8-14 (e.g., spinach, soybeans, and antacids) [1]. Eventually, this constant change in pH can decrease the fracture strength of glass-ceramics [13,14] and increase surface roughness [15,16]. This roughening of the restoration can lead to plaque accumulation and increased wear of the opposing enamel [17,18]. Dental restorations should be able to withstand these fluctuations in pH.Chemical durability of dental materials has been extensively studied because of the importance of this property on the longevity of the restoration. Intrinsic or extrinsic modifications can be used to improve chemical durability. Several studies have demonstrated chemical stability for glass-ceramics can be enhanced by (1) different ratio of compositions; (2) addition of oxides, such as CaO, K 2 O, and Al 2 O 3 ; and (3) fluorine and calcium phosphates as part of intrinsic modifications [19-23]. Extrinsic modification can be achieved by producing additional layers on the surface to enhance chemical durability and other physical properties [24-26]. Esquivel-Upshaw et al. showed that glazed material has better chemical resistance than non-glazed material [1]. Topateş et al. discussed the effect of different glaze compositions on chemical durability [25]. Rau et al. reported that the chemical resistance and corrosion rate of magnesium alloy were improved with the application of a glass-ceramic coating [26].Chemical durability is also important because leached ions during corrosion may not be safe. The literature demonstrated the cytotoxicity of materials in ceramic [27][28][29][30]. Elshahawy et al. reported that Zn had the highest cytotoxicity (60% cell viability) to fibroblast cells among the ions released from gold alloys and ceramic crowns in patients' saliva, followed by Cu > Ag > Pd > Al > Au > Si. The cyt...

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Novel Coating to Minimize Corrosion of Glass-Ceramics for Dental Applications

et al. 2020

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“…(40) Also, Vickers Hardness Test is a convenient mean for investigating the mechanical properties of small volume materials. (45) Vita Enamic recorded the highest weight loss followed by IPS e.max CAD then Celtra Duo. There was a significant difference between Vita Enamic weight loss and both IPS e.max CAD and Celtra Duo, while there was no significant difference between IPS e.max CAD and Celtra Duo weight loss.…”

Section: Discussionmentioning

confidence: 93%

Wear and Microhardness of Three Different Types of CAD/CAM Ceramic Materials

Salem

2019

Egyptian Dental Journal

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Objective: Wear and microhardness of three different types of CAD/CAM ceramics against enamel as an occlusal antagonist were studied. Also, microhardness was evaluated. Materials and Methods: The three tested ceramics were: Vita Enamic (polymer-infiltrated ceramic), IPS e.max CAD (lithium disilicate ceramic) and Celtra Duo (Zirconia reinforced lithium silicate ceramic). The occlusal antagonists were extracted teeth. Thirty samples were constructed divided into 3 groups according to the type of ceramic used (10 samples each). Then each group was subdivided into 2 subgroups (5 samples each), The first subgroups underwent a microhardness test while the other subgroups were first weighed then subjected to wear test and finally re-weighed again before being subjected to microhardness test. Results: The results showed a significant difference in weight loss due to wear between Vita Enamic and both IPS e.max CAD and Celtra Duo. There was also a significant difference for the antagonist tooth structure as regard both weight and height loss between Vita Enamic and both IPS e.max CAD and Celtra Duo. Microhardness results showed a significant difference between Vita Enamic and both IPS e.max CAD and Celtra Duo as regard microhardness without and after wear. For all the tested ceramics, there was no significant difference as regard microhardness without and after wear test. Also, there was no significant difference as regard wear and microhardness between IPS e.max CAD and Celtra Duo. Conclusions: Vita Enamic showed the worst wear behavior and the least abrasiveness to enamel while, IPS e.max CAD and Celtra Duo showed comparable wear behavior and abrasiveness to enamel. Also, ceramic microhardness was not affected by wear for the three tested ceramics.

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“…Another report suggested better mechanical properties of polymer-ceramic materials, with less brittleness, better edge stability as well as superior machinability and esthetics [37]. Nguyen et al [38] stated that mechanical properties, including FS, hardness and fracture toughness, were significantly improved in NCRCs using the method of manufacturing pre-polymerized materials under high pressure and high temperature.…”

Section: Discussionmentioning

confidence: 99%