In Vitro Evaluation and Comparison of the Translucency of Two Different All-Ceramic Systems

Jurišić, Sanja; Jurišić, Gordan; Zlatarić, Dubravka Knezović

doi:10.15644/asc49/3/1

Cited by 31 publications

(22 citation statements)

References 28 publications

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“…39 statistical analysis SPSS-20.0 (IBM, Chicago, IL, USA) was used for statistical data analysis. The results of the tensile strength and translucency were presented as mean, SD, minimum, and maximum observations (Tables 2 and 3).…”

Section: Translucency Testmentioning

confidence: 99%

Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

Gad¹,

Abualsaud²,

Rahoma

et al. 2018

IJN

115

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Background Polymethyl methacrylate (PMMA) is widely used for the fabrication of removable prostheses. Recently, zirconium oxide nanoparticles (nano-ZrO 2 ) have been added to improve some properties of PMMA, but their effect on the optical properties and tensile strength are neglected. Objective The aim of this study was to investigate the effect of nano-ZrO 2 addition on the translucency and tensile strength of the PMMA denture base material. Materials and methods Eighty specimens (40 dumbbell-shaped and 40 discs) were prepared out of heat-polymerized acrylic resin and divided into four groups per test (n=10). The control group for each test included unreinforced acrylic, while the test groups were reinforced with 2.5, 5, and 7.5 wt% nano-ZrO 2 . Acrylic resin was mixed according to manufacturer’s instructions, packed, and processed by conventional method. After polymerization, all specimens were finished, polished, and stored in distilled water at 37°C for 48±2 hours. Tensile strength (MPa) was evaluated using the universal testing machine while the specimens’ translucency was examined using a spectrophotometer. Statistical analysis was carried out by SPSS using the paired sample t -test ( p ≤0.05). A scanning electron microscope was used to analyze the morphological changes and topography of the fractured surfaces. Results This study showed that the mean tensile strength of the PMMA in the test groups of 2.5%NZ, 5%NZ, and 7.5%NZ was significantly higher than the control group. The tensile strength increased significantly after nano-ZrO 2 addition, and the maximum increase seen was in the 7.5%NZ group. The translucency values of the experimental groups were significantly lower than those of the control group. Within the reinforced groups, the 2.5%NZ group had significantly higher translucency values when compared to the 5%NZ and 7.5%NZ groups. Conclusion The addition of nano-ZrO 2 increased the tensile strength of the denture base acrylic. The increase was directly proportional to the nano-ZrO 2 concentration. The translucency of the PMMA was reduced as the nano-ZrO 2 increased. Clinical significance Based on the results of the current study, the tensile strength was improved with different percentages of nano-ZrO 2 additions. However, translucency was adversely affected. Therefore, it is important to determine the appropriate amount of reinforcing nano-ZrO 2 that will create a balance between achieved properties – mechanical and optical.

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Section: Translucency Testmentioning

confidence: 99%

Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

Gad¹,

Abualsaud²,

Rahoma

et al. 2018

IJN

115

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show abstract

“…Yttria‐stablized tetragonal zirconia polycrystal (Y‐TZP) is applied as a dental ceramic. Y‐TZP is recognized as the toughest ceramic among all dental ceramics, but not as the most esthetic ceramic . Translucency of zirconia is less than that of tooth structures and other dental ceramics .…”

Section: Manufacturing Processesmentioning

confidence: 99%

“…As the ceramic translucency increases, the background effect increases. Monolithic zirconia ceramics are more translucent than framework zirconia ceramics and less translucent than feldspathic and glass ceramics . Thus, the background aspect for monolithic zirconia ceramics may be more critical than that for framework zirconia ceramics and less critical than that for feldspathic and glass ceramics.…”

Section: Clinical Factorsmentioning

confidence: 99%

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Tabatabaian

2018

Journal of Prosthodontics

116

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Monolithic zirconia restoration is an acceptable treatment option in restorative dentistry and a developing trend in esthetic dentistry. Digital dentistry has simplified fabrication of monolithic zirconia restorations. Zirconia ceramic has introduced an opportunity to achieve both esthetic and mechanical requirements for restorations. This is rarely found for a ceramic in dentistry. Monolithic zirconia restorations represent an acceptable durability, comparable to metal-ceramic restorations, while they are superior to metal-ceramic restorations esthetically; however, difficulties to gain an optimal shade reproduction and a color match with monolithic zirconia restorations still remain. The color of these restorations may be influenced by manufacturing processes, laboratory procedures, and clinical factors. Manufacturing processes determine basic optical properties of zirconia ceramics. Different laboratory procedures may create optical changes in zirconia ceramics. Also clinical factors such as dental background, cement, and zirconia restoration features may affect the resulting color. This literature review aimed to discuss potent factors in the color of monolithic zirconia restorations. An electronic search of the PubMed/Google Scholar database was performed to find related English-language articles published between January 1, 2000, and October 31, 2017. The key terms of background, cement, ceramic, color, esthetics, shade, spectrophotometry, thickness, translucency, and zirconia were used both individually and simultaneously. Also, a manual search was conducted, and five classic articles of color science were added. Thus 192 articles were included. In the last decade, shade reproduction of monolithic zirconia restorations has been highly regarded; however, further improvements are required in the manufacturing process to produce tooth-like zirconia ceramics. An esthetic guideline named background-cement-ceramic color harmony was suggested in this study; however, more clinical practice guidelines should be established for monolithic zirconia restorations on esthetics, and therefore, more studies are required.

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“…In addition to the material's excellent esthetics and tissue tolerance compared with metal‐ceramic restorations, its transformational toughening property provides high flexure strength (up to 1200 MPa) and fracture toughness (6 to 9 MPa.m ½ ) . However, because of the opaque nature of zirconia, veneering has been done with a more translucent feldspathic porcelain to achieve the desired esthetics . Therefore, to ensure the long‐term success of zirconia‐based restorations, sufficient bond strength is essential between veneering ceramic and the zirconia framework substructure …”

mentioning

confidence: 99%

“…[8][9][10][11][12][13][14] However, because of the opaque nature of zirconia, veneering has been done with a more translucent feldspathic porcelain to achieve the desired esthetics. 15,16 Therefore, to ensure the long-term success of zirconia-based restorations, sufficient bond strength is essential between veneering ceramic and the zirconia framework substructure. [17][18][19][20][21][22][23] Taskonak et al 24 examined the causes of failure in zirconiabased restorations and found that fractures initiated in the ce-ramic veneer layer.…”

mentioning

confidence: 99%

Fracture Resistance of Monolithic Glass‐Ceramics Versus Bilayered Zirconia‐Based Restorations

Hamza

Sherif

2017

Journal of Prosthodontics

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In Vitro Evaluation and Comparison of the Translucency of Two Different All-Ceramic Systems

Cited by 31 publications

References 28 publications

Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Fracture Resistance of Monolithic Glass‐Ceramics Versus Bilayered Zirconia‐Based Restorations

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