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

Alghamdi, Wejdan S.; Labban, Nawaf; Maawadh, Ahmed; Alsayed, Hussain D.; Alrahlah, Ali; Alnafaiy, Sarah M.

doi:10.3390/ma15176146

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…% Al 2 O 3 [2]. The composition, size, and dispersion of the filler particles in the resin matrix could be another factor contributing to the differing fracture toughness of these materials [32,33]. Overall, there was no discernible difference in the fractured specimens immersed in AS and Cola as observed in the SEM micrographs.…”

Section: Discussionmentioning

confidence: 88%

“…According to the manufacturer, the CU material is reported to be the most elastic resin matrix-ceramic available on the market. The improved fracture toughness of CU might be the attributed to the flexible nature of the material and presumably because of the chemical stability of the polymeric content [32]. Elasticity allows the material to flex while chewing or under stress thereby minimising chipping and fractures [35].…”

Section: Discussionmentioning

confidence: 99%

“…In a recent study by Goujat et al, [36], the reported fracture toughness values of VE, CS and LU were similar to those reported in the present study. However, a comparison with previous findings should be made carefully due to the differences in the materials and methodologies applied [32].…”

Section: Discussionmentioning

confidence: 99%

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Fracture Toughness of Dental Cad/Cam Resin-Matrix Ceramics Exposed to an Acidic Environment

Alghamdi¹

2022

Ceramics - Silikaty

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This study aimed to assess the effects of an acidic environment on the fracture toughness of dental CAD/CAM resin-matrix ceramics. One hundred rectangular specimens (18 × 4 × 3 mm 3 ) were obtained from four CAD/CAM resin-matrix ceramic blocks -Crystal Ultra (CU), Vita Enamic (VE), Lava Ultimate (LU), Cerasmart (CS) -and a Vitablocs Mark II (VMII) glass-matrix ceramic. Specimens from each material group were aged either in artificial saliva or cola for one week (n = 10). The fracture toughness (KIc) was evaluated using the single-edge v-notch beam (SEVNB) method in a three-point bending set-up. The fractured specimen surfaces were analysed using a scanning electron microscope (SEM). The data were analysed using a two-way ANOVA with the post hoc Bonferroni and paired t-test (p < 0.05). The two-way ANOVA suggested that the materials significantly affected the KIc (p < 0.001), while the ageing environment had no significant effect on the KIc (p = 0.285). The highest KIc was observed in the CU group aged in cola (1.53 ± 0.12 MPa•m 1/2 ), while the lowest mean KIc was observed in the CS group aged in saliva (1.17 ± 0.08 MPa•m 1/2 ). All the tested CAD/CAM resin-matrix ceramics showed improved fracture toughness in an acidic environment compared to the artificial saliva. However, the fracture toughness of the CS and CU groups significantly improved in an acidic environment compared to the artificial saliva, demonstrating the ability of these materials to resist an erosive acidic environment.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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Fracture Toughness of Dental Cad/Cam Resin-Matrix Ceramics Exposed to an Acidic Environment

Alghamdi¹

2022

Ceramics - Silikaty

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“…For both IPS e.max CAD and Vita Enamic, using the isoMet 4000 microsaw, samples were sectioned to a thickness of one mm, and were verified using a digital caliper to Several research have intensified the influence of the surface finishing procedures and polishing materials on the color instability and surface irregularities of the restorative esthetic materials. Hence, prior to any testing procedures, all samples for both materials were finished and polished by the same technician following their manufacturer's instructions to attain a highly smooth flat surface, to ensure reliability of the measurements [51][52][53][54] .…”

Section: Discussionmentioning

confidence: 99%

Translucency, Microhardness and Fracture Toughness of Two Machinable Ceramics as Affected by Two Acidic Beverages

Sami

2023

Egyptian Dental Journal

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Statement of the Problem: Alterations of pH in the oral cavity can lead to degradation of machinable esthetic materials that mimic the natural tooth appearance resulting in an esthetic failure. Hence, the stability of the optical and mechanical characteristics of these materials is essential for a long-term successful restoration.Aim of the Study: To evaluate the translucency, microhardness, and fracture toughness of two CAD/CAM materials (IPS e.max CAD and Vita Enamic) after immersion in two acidic beverages (Coffee and Coca-Cola).Materials and methods: A total of 36 samples were equally divided into two groups each (n=18) as follows, Group I: IPS e.max CAD and Group II: Vita Enamic. Each group was further subdivided into two subgroups (n=9) according to the acidic beverage used, either Coffee, or Coca-Cola. Samples were immersed in acidic beverage solutions for three weeks, after which all samples were subjected to measure the translucency parameter using a Reflective Spectrophotometer and then using Vickers Micro-Hardness Tester to measure surface microhardness and fracture toughness. Statistical analysis was performed using one-way analysis of variance followed by Tukey's posthoc test if showed significance. Student t-test was done between main groups, while Two-way ANOVA compared the effect of each factor.Results: There was a statistically significant difference between IPS e.max CAD and Vita Enamic regarding translucency. Significant difference in surface microhardness, and fracture toughness after immersion in two acidic beverage solutions was revealed.Conclusions: Acidic beverages can adversely affect the translucency of glass-ceramic and hybrid ceramic materials. Microhardness and fracture toughness of different CAD/CAM esthetic materials was negatively affected secondary to exposure to beverages with low pH values.

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“…To evaluate the specimens’ surface roughness (surface roughness average, Ra), a profilometer (non-contact; Contour Gt-K1 optical profiler; Bruker Nano, Inc., Tucson, AZ, USA) was used, in which each specimen was mounted on the automated x-y stage. Five different points were scanned using scanning parameters as described by a previous study [ 32 ]. Following that, the capture images were used to calculate the averaged surface roughness (um) per specimen, Figure 3 and Figure 4 [ 3 ].…”

Section: Methodsmentioning

confidence: 99%

Comparative Evaluation of Surface Roughness and Hardness of 3D Printed Resins

et al. 2022

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The effect of printing parameters on the surface characteristics of three-dimensional (3D)-printed denture base resins (DBRs) is neglected. Therefore, this study investigated the effect of printing orientation and post-curing time on the surface roughness and hardness. One conventional heat-polymerized (HP) resin and two 3D-printing resins (NextDent (ND) and ASIGA (AS)) were used to fabricate a total of 250-disc (10 × 2.5 mm) specimens. ND and AS specimens were printed with different orientations (0-, 45-, and 90-degree) and each orientation group was subjected to four post-curing times (30, 60, 90, 120 min). Printed specimens were thermo-cycled (10,000 cycles) followed by the measuring of surface roughness (Profilometer (Ra)) and hardness (a Vickers hardness (VH)). ANOVA and post hoc tests were used for data analysis (α = 0.05) at significant levels. AS and ND showed no significant changes in Ra when compared with HP (p ˃ 0.05), except the 45-degree orientation (AS/90 min and AS/120 min) significantly increased surface roughness (p ˂ 0.001). There was no significant difference in Ra with different orientations and post-curing time for both materials AS and ND (p ˃ 0.05). Compared with HP, 3D-printed DBRs showed low VH values (p ˂ 0.001). For AS, 90-degree orientation showed a significant decrease in VH at 60, 90, and 120 min when compared with 0- and 45-degree orientation (p ˂ 0.001), while ND showed no significant difference in VH with different printing orientations (p ˃ 0.05). The VH of AS and ND improved when increasing post-curing time to 120 min (p ˂ 0.001), and the printing orientations and post-curing time did not affect the Ra of 3D-printed DBRs.

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

Cited by 10 publications

References 33 publications

Fracture Toughness of Dental Cad/Cam Resin-Matrix Ceramics Exposed to an Acidic Environment

Fracture Toughness of Dental Cad/Cam Resin-Matrix Ceramics Exposed to an Acidic Environment

Translucency, Microhardness and Fracture Toughness of Two Machinable Ceramics as Affected by Two Acidic Beverages

Comparative Evaluation of Surface Roughness and Hardness of 3D Printed Resins

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