Limits...
Biaxial flexural strength of bilayered zirconia using various veneering ceramics.

Chantranikul N, Salimee P - J Adv Prosthodont (2015)

Bottom Line: BFS of K/CZR, K/EM and K/VT were not significantly different from each other, but were significantly lower than the other two groups.Weibull distribution reported the same trend of reliability as the BFS results.From the result of this study, the BFS of the bilayered zirconia/veneer composite did not only depend on the Young's modulus value of the materials.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.

ABSTRACT

Purpose: The aim of this study was to evaluate the biaxial flexural strength (BFS) of one zirconia-based ceramic used with various veneering ceramics.

Materials and methods: Zirconia core material (Katana) and five veneering ceramics (Cerabien ZR; CZR, Lava Ceram; LV, Cercon Ceram Kiss; CC, IPS e.max Ceram; EM and VITA VM9; VT) were selected. Using the powder/liquid layering technique, bilayered disk specimens (diameter: 12.50 mm, thickness: 1.50 mm) were prepared to follow ISO standard 6872:2008 into five groups according to veneering ceramics as follows; Katana zirconia veneering with CZR (K/CZR), Katana zirconia veneering with LV (K/LV), Katana zirconia veneering with CC (K/CC), Katana zirconia veneering with EM (K/EM) and Katana zirconia veneering with VT (K/VT). After 20,000 thermocycling, load tests were conducted using a universal testing machine (Instron). The BFS were calculated and analyzed with one-way ANOVA and Tukey HSD (α=0.05). The Weibull analysis was performed for reliability of strength. The mode of fracture and fractured surface were observed by SEM.

Results: It showed that K/CC had significantly the highest BFS, followed by K/LV. BFS of K/CZR, K/EM and K/VT were not significantly different from each other, but were significantly lower than the other two groups. Weibull distribution reported the same trend of reliability as the BFS results.

Conclusion: From the result of this study, the BFS of the bilayered zirconia/veneer composite did not only depend on the Young's modulus value of the materials. Further studies regarding interfacial strength and sintering factors are necessary to achieve the optimal strength.

No MeSH data available.


Related in: MedlinePlus

BFS test conducted on bilayered zirconia/veneer specimens using a universal testing machine according to ISO standard 6872:2008.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4644776&req=5

Figure 2: BFS test conducted on bilayered zirconia/veneer specimens using a universal testing machine according to ISO standard 6872:2008.

Mentions: The BFS was measured using a piston on three balls in a universal testing machine (Servo hydraulic system model 8872, Instron, England) according to ISO standard 6872: 2008 (Fig. 2).18 The test was carried out by placing the zirconia core at the bottom side and using a crosshead speed at 0.5 mm/min until failure. Between the piston and the specimen, a thin plastic sheet (thickness 0.05 mm) was placed to distribute the load and minimize stress concentration. The load at the time of fracture was recorded and the BFS was calculated by using formula for bilayered disk1920 shown in Fig. 3. The mean and standard deviation of BFS data were collected for each group. Statistical analyses were performed with one-way ANOVA and Tukey post hoc multiple comparison tests (α = .05) using SPSS version 17.0 (SPSS Inc., Chicago, IL, USA). The reliability of strength was analyzed with the Weibull distribution. The Weibull modulus was obtained from the slope by plotting the probability of survival of each specimen and fracture stresses as follows:21


Biaxial flexural strength of bilayered zirconia using various veneering ceramics.

Chantranikul N, Salimee P - J Adv Prosthodont (2015)

BFS test conducted on bilayered zirconia/veneer specimens using a universal testing machine according to ISO standard 6872:2008.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644776&req=5

Figure 2: BFS test conducted on bilayered zirconia/veneer specimens using a universal testing machine according to ISO standard 6872:2008.
Mentions: The BFS was measured using a piston on three balls in a universal testing machine (Servo hydraulic system model 8872, Instron, England) according to ISO standard 6872: 2008 (Fig. 2).18 The test was carried out by placing the zirconia core at the bottom side and using a crosshead speed at 0.5 mm/min until failure. Between the piston and the specimen, a thin plastic sheet (thickness 0.05 mm) was placed to distribute the load and minimize stress concentration. The load at the time of fracture was recorded and the BFS was calculated by using formula for bilayered disk1920 shown in Fig. 3. The mean and standard deviation of BFS data were collected for each group. Statistical analyses were performed with one-way ANOVA and Tukey post hoc multiple comparison tests (α = .05) using SPSS version 17.0 (SPSS Inc., Chicago, IL, USA). The reliability of strength was analyzed with the Weibull distribution. The Weibull modulus was obtained from the slope by plotting the probability of survival of each specimen and fracture stresses as follows:21

Bottom Line: BFS of K/CZR, K/EM and K/VT were not significantly different from each other, but were significantly lower than the other two groups.Weibull distribution reported the same trend of reliability as the BFS results.From the result of this study, the BFS of the bilayered zirconia/veneer composite did not only depend on the Young's modulus value of the materials.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.

ABSTRACT

Purpose: The aim of this study was to evaluate the biaxial flexural strength (BFS) of one zirconia-based ceramic used with various veneering ceramics.

Materials and methods: Zirconia core material (Katana) and five veneering ceramics (Cerabien ZR; CZR, Lava Ceram; LV, Cercon Ceram Kiss; CC, IPS e.max Ceram; EM and VITA VM9; VT) were selected. Using the powder/liquid layering technique, bilayered disk specimens (diameter: 12.50 mm, thickness: 1.50 mm) were prepared to follow ISO standard 6872:2008 into five groups according to veneering ceramics as follows; Katana zirconia veneering with CZR (K/CZR), Katana zirconia veneering with LV (K/LV), Katana zirconia veneering with CC (K/CC), Katana zirconia veneering with EM (K/EM) and Katana zirconia veneering with VT (K/VT). After 20,000 thermocycling, load tests were conducted using a universal testing machine (Instron). The BFS were calculated and analyzed with one-way ANOVA and Tukey HSD (α=0.05). The Weibull analysis was performed for reliability of strength. The mode of fracture and fractured surface were observed by SEM.

Results: It showed that K/CC had significantly the highest BFS, followed by K/LV. BFS of K/CZR, K/EM and K/VT were not significantly different from each other, but were significantly lower than the other two groups. Weibull distribution reported the same trend of reliability as the BFS results.

Conclusion: From the result of this study, the BFS of the bilayered zirconia/veneer composite did not only depend on the Young's modulus value of the materials. Further studies regarding interfacial strength and sintering factors are necessary to achieve the optimal strength.

No MeSH data available.


Related in: MedlinePlus