Vickers micro-hardness study of the effect of fluoride mouthwash on two types of CAD/CAM ceramic materials erosion

Kermanshah, Hamid; Ahmadi, Elham; Rafeie, Niyousha; Rafizadeh, Shiva; Omrani, Ladan Ranjbar

doi:10.1186/s12903-022-02135-z

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…A significantly lower microhardness was observed among the study groups immersed in cola compared to those specimens immersed in AS. Our findings are in line with the previous studies [ 8 , 23 ] that advocate the deleterious effect of an acidic environment on the microhardness of the glass-ceramic material. Although the ceramic material is considered chemically inert, MII showed a deleterious effect after immersion in cola for 7 days.…”

Section: Discussionsupporting

confidence: 93%

“…Characterization through hardness is an important step to evaluate the clinical life of a material [ 22 ]. In the current study, MII showed the highest microhardness values compared to other groups, which could be related to the peculiar characteristics of ceramic material, as this material has smaller and more homogenous crystal sizes with enhanced interlocking between them [ 23 ]. A significantly lower microhardness was observed among the study groups immersed in cola compared to those specimens immersed in AS.…”

Section: Discussionmentioning

confidence: 99%

“…The specimens were positioned and secured in the lower sample holder of the device and the antagonist was affixed to a metal stylus in the upper sample holder. A chewing force of 49 N and 120,000 chewing cycles at a frequency of 1.6 Hz were applied to simulate approximately 6 months of the clinical life in accordance with previous studies [ 21 , 23 , 24 ]. After simulated chewing, the steatite–ceramic antagonist placed against each CAD/CAM specimen were removed from the sample holder, rinsed in running water and then dried and weighed to obtain the final mass.…”

Section: Methodsmentioning

confidence: 99%

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Influence of Acidic Environment on the Hardness, Surface Roughness and Wear Ability of CAD/CAM Resin-Matrix Ceramics

et al. 2022

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This study aimed to measure the effect of storage environment on the hardness, surface roughness and wear ability of CAD/CAM resin-matrix ceramics. A total of 200 rectangular-shaped specimens were obtained by sectioning 5 CAD/CAM blocks; Crystal Ultra (CU), Vita Enamic (VE), Lava Ultimate (LU), Cerasmart (CS) and Vita blocks Mark II (MII). Microhardness and surface roughness were measured at baseline and after 7 days of immersion either in saliva or cola (n = 10). The wear ability of the CAD/CAM materials against steatite-ceramics antagonist was determined using a chewing simulator. The data were statistically analyzed using factorial ANOVA followed by post hoc Bonferroni multiple comparison tests (p < 0.05). The independent factors significantly influenced the microhardness and surface roughness (p < 0.05). The highest VHN was observed in MII at baseline (586.97 ± 13.95), while CU showed the lowest VHN after 7 days of immersion in cola (68.3 ± 1.89). On the contrary, the highest Ra was observed after 120,000 chewing cycles for the VE specimens (1.09 ± 0.43 µm) immersed in cola, while LU showed the lowest Ra at baseline (0.07 ± 0.01 µm). The highest % mass loss of the antagonist was observed with MII immersed in cola (1.801%), while CS demonstrated the lowest % mass loss of 0.004% and 0.007% in AS and cola, respectively. This study confirms that the surface properties of tested CAD/CAM materials are susceptible to degradation in an acidic environment except for hardness and wear of CS material.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Influence of Acidic Environment on the Hardness, Surface Roughness and Wear Ability of CAD/CAM Resin-Matrix Ceramics

et al. 2022

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“…The hardness of studied groups (n = 10/subgroup) was evaluated at room temperature using Vickers microhardness tester (FM-700, Future Tech Corp., Japan) with a load of 500 gf for 10 s. Five indentations were placed 0.5 mm apart from each other in a horizontal direction across the tested specimen (UNI EN ISO 6507) [ 26 ]. The two diagonal lines generated from each indentation were measured using the microhardness tester machine which automatically generates the VHN for the resulted indentations according to the following equation [ 27 ]: where Hv is the Vickers hardness number in kg/mm 2 , P is the indenter load in kg and d is the diagonal length of the impression in mm.…”

Section: Methodsmentioning

confidence: 99%

Effect of erosive media on microhardness and fracture toughness of CAD-CAM dental materials

2022

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Background Erosive acids might create surface flaws and deteriorate the mechanical properties of CAD-CAM materials. This invitro study aimed to investigate the effect of simulated gastric HCl and extrinsic erosive acids on surface microhardness and fracture toughness of CAD-CAM materials. Methods 400 bar-shaped specimens (17×4×2 mm3) were prepared from 4 different CAD-CAM dental materials (n = 100/group); monolithic zirconia (Ceramill Zolid HT+, Amanngirbach, Austria), lithium disilicate ceramic (IPS e.max CAD, Ivoclar Vivadent, Liechtenstein), nanohybrid resin composite (Grandio Blocs, VOCO) and polymer-infiltrated glass network (Vita Enamic, VITA Zahnfabrik). Specimens from each material type were further subdivided into 5 groups (n = 20) according to the erosive media applied (simulated gastric HCl, white wine, Coca-Cola®, orange juice, and artificial saliva that served as a control). Specimens were immersed for 24 h in an incubator at 37 ℃, then ultrasonically cleaned in distilled water and air-dried. Half of the specimens were tested for Vickers microhardness (VHN) at parameters of 500 gf for 10 s, while the rest of the specimens underwent 3-point flexure till fracture. Fractured surfaces were examined under a scanning electron microscope (SEM) for fracture toughness (KIC) calculation using the quantitative fractographic analysis method. Data collected were statistically analyzed using two-way analysis of variance (α = 0.05) after verification of data normality and homogeneity of variances. Results Erosive media created surface flaws that lowered the surface microhardness of the material and initiated the fracture pattern under different loads according to material type. The material type was a more predominant factor than erosive media that affected either the microhardness or the fracture toughness of CAD-CAM dental materials. The highest VHN and KIC values were found among Ceramill Zolid HT+ groups followed by IPS e.max CAD and Grandio Blocs regardless of the erosive media employed. Erosive media significantly reduced the VHN and KIC in Vita Enamic specimens compared to the rest of the material types. Conclusion All CAD-CAM materials used, except Vita Enamic, showed high resistance against the erosive acids indicating higher longevity of the material in patients frequently exposed to either extrinsic or intrinsic acid.

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“…Today, rising living standards have induced significant changes in individuals' lifestyles and habits, and as a result, human lifespan has been extended (1). Scientists have played an important role in the management of the process by shifting the focus of their work to the technological support of this increasing time (2).…”

Section: Introductionmentioning

confidence: 99%

The effects of whitening mouthrinses on the color stability of CAD/CAM resin matrix ceramics

Eskitaşçıoğlu

2022

Med Sci Discov

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Objective: This study aimed to evaluate the color change of CAD/CAM resin matrix ceramic, which was exposed to three different whitening mouth rinses and artificial saliva for 12 and 180 hours. Material and Methods: A total of 60 samples were produced from prefabricated CAD/CAM resin matrix ceramic blocks for experimental study. The samples were randomly divided into four subgroups according to the whitening mouthrinses: Listerine Advanced White, Colgate Optic White, Oral B 3D White Luxe, and artificial saliva. Spectrophotometric measurements were made from each sample at 3 different times, before (initial) exposure to mouthrinses, 12 hours and 180 hours after exposure (∆E001, ∆E002 and ∆E003). While using the generalized linear models method for the comparison of ∆E00, ∆L, ∆a, and ∆b color changes according to the mouthrinse and exposure time; multiple comparisons were made with the Tukey HSD Test. The significance level was taken as p<0.050. Results: The results of the two-way analysis of variance showed that the used mouthrinse and the exposure time had a statistically significant effect on the ∆E00 values representing the color change (p<0.001), while the interaction between the mouthrinse and the time of use did not play an important role (p=0.165). Conclusion: After exposure time of 180 hours, all whitening mouthrinses induce color change of resin matrix ceramics above clinically noticeable level.

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Vickers micro-hardness study of the effect of fluoride mouthwash on two types of CAD/CAM ceramic materials erosion

Cited by 8 publications

References 36 publications

Influence of Acidic Environment on the Hardness, Surface Roughness and Wear Ability of CAD/CAM Resin-Matrix Ceramics

Influence of Acidic Environment on the Hardness, Surface Roughness and Wear Ability of CAD/CAM Resin-Matrix Ceramics

Effect of erosive media on microhardness and fracture toughness of CAD-CAM dental materials

The effects of whitening mouthrinses on the color stability of CAD/CAM resin matrix ceramics

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