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Effects of core characters and veneering technique on biaxial flexural strength in porcelain fused to metal and porcelain veneered zirconia.

Oh JW, Song KY, Ahn SG, Park JM, Lee MH, Seo JM - J Adv Prosthodont (2015)

Bottom Line: Half of each core group was 0.5 mm-in thickness and the other half was 1.0 mm-in thickness.Thus, there were four groups with 20 cores/group.Tensile strength was measured using the biaxial flexural strength test based on the ISO standard 6872:2008 and Weibull analysis was conducted.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science, Chonbuk National University, Jeonju, Republic of Korea.

ABSTRACT

Purpose: The purpose of this study was to assess the impact of the core materials, thickness and fabrication methods of veneering porcelain on prosthesis fracture in the porcelain fused to metal and the porcelain veneered zirconia.

Materials and methods: Forty nickel-chrome alloy cores and 40 zirconia cores were made. Half of each core group was 0.5 mm-in thickness and the other half was 1.0 mm-in thickness. Thus, there were four groups with 20 cores/group. Each group was divided into two subgroups with two different veneering methods (conventional powder/liquid layering technique and the heat-pressing technique). Tensile strength was measured using the biaxial flexural strength test based on the ISO standard 6872:2008 and Weibull analysis was conducted. Factors influencing fracture strength were analyzed through three-way ANOVA (α≤.05) and the influence of core thickness and veneering method in each core materials was assessed using two-way ANOVA (α≤.05).

Results: The biaxial flexural strength test showed that the fabrication method of veneering porcelain has the largest impact on the fracture strength followed by the core thickness and the core material. In the metal groups, both the core thickness and the fabrication method of the veneering porcelain significantly influenced on the fracture strength, while only the fabrication method affected the fracture strength in the zirconia groups.

Conclusion: The fabrication method is more influential to the strength of a prosthesis compared to the core character determined by material and thickness of the core.

No MeSH data available.


Related in: MedlinePlus

Probability Weibull was analyzed for group comparisons.
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Figure 3: Probability Weibull was analyzed for group comparisons.

Mentions: Table 8 shows the results of the Weibull analysis for the biaxial flexural strength. The shape parameter indicates the probability of fracture at varying stresses. In all samples, the values of the shape parameter exceeded 1, meaning that the probability of fracture increased as stress increased. The second row in the table presents Weibull scale values, which indicated that strain with 63.2% of the materials show fracture. Fracture probability versus fracture strength was analyzed for each group (Fig. 3). From the group comparison analysis, two important findings were obtained. First, consistent with the results of fracture strength test, the fracture possibility increased as the fracture strength increased. Second, M1.0P was the highest scale parameter followed by Z1.0P, M0.5P, Z0.5P, M1.0C, Z0.5C, Z1.0C and M0.5C.


Effects of core characters and veneering technique on biaxial flexural strength in porcelain fused to metal and porcelain veneered zirconia.

Oh JW, Song KY, Ahn SG, Park JM, Lee MH, Seo JM - J Adv Prosthodont (2015)

Probability Weibull was analyzed for group comparisons.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644775&req=5

Figure 3: Probability Weibull was analyzed for group comparisons.
Mentions: Table 8 shows the results of the Weibull analysis for the biaxial flexural strength. The shape parameter indicates the probability of fracture at varying stresses. In all samples, the values of the shape parameter exceeded 1, meaning that the probability of fracture increased as stress increased. The second row in the table presents Weibull scale values, which indicated that strain with 63.2% of the materials show fracture. Fracture probability versus fracture strength was analyzed for each group (Fig. 3). From the group comparison analysis, two important findings were obtained. First, consistent with the results of fracture strength test, the fracture possibility increased as the fracture strength increased. Second, M1.0P was the highest scale parameter followed by Z1.0P, M0.5P, Z0.5P, M1.0C, Z0.5C, Z1.0C and M0.5C.

Bottom Line: Half of each core group was 0.5 mm-in thickness and the other half was 1.0 mm-in thickness.Thus, there were four groups with 20 cores/group.Tensile strength was measured using the biaxial flexural strength test based on the ISO standard 6872:2008 and Weibull analysis was conducted.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science, Chonbuk National University, Jeonju, Republic of Korea.

ABSTRACT

Purpose: The purpose of this study was to assess the impact of the core materials, thickness and fabrication methods of veneering porcelain on prosthesis fracture in the porcelain fused to metal and the porcelain veneered zirconia.

Materials and methods: Forty nickel-chrome alloy cores and 40 zirconia cores were made. Half of each core group was 0.5 mm-in thickness and the other half was 1.0 mm-in thickness. Thus, there were four groups with 20 cores/group. Each group was divided into two subgroups with two different veneering methods (conventional powder/liquid layering technique and the heat-pressing technique). Tensile strength was measured using the biaxial flexural strength test based on the ISO standard 6872:2008 and Weibull analysis was conducted. Factors influencing fracture strength were analyzed through three-way ANOVA (α≤.05) and the influence of core thickness and veneering method in each core materials was assessed using two-way ANOVA (α≤.05).

Results: The biaxial flexural strength test showed that the fabrication method of veneering porcelain has the largest impact on the fracture strength followed by the core thickness and the core material. In the metal groups, both the core thickness and the fabrication method of the veneering porcelain significantly influenced on the fracture strength, while only the fabrication method affected the fracture strength in the zirconia groups.

Conclusion: The fabrication method is more influential to the strength of a prosthesis compared to the core character determined by material and thickness of the core.

No MeSH data available.


Related in: MedlinePlus