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Document Type |
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Article In Journal |
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Document Title |
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INFLUNCE OF VENEERING AND HEAT TREATMENT ON FLEXURE STRENGTH OF LITHIUM DISILICATE-BASED CERAMICS INFLUNCE OF VENEERING AND HEAT TREATMENT ON FLEXURE STRENGTH OF LITHIUM DISILICATE-BASED CERAMICS |
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Document Language |
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English |
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Abstract |
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The aim of the present study was to evaluate and compare the influence of subjecting
both Empress 2 and Third generation Optimal Pressable Ceramic (3G OPC) core
materials to the recommended firing cycles and application of the veneering porcelain
on the flexure strength of tested materials .
Methods: Four group specimens for each material were prepared and a biaxial flexure
test was conducted using a Universal Testing Machine (Model 1197, Instron Corp.,
Canton, Mass ).Four groups from each material were prepared, each group consists of
seven samples. Empress 2 material were used to prepare group L 11, IJI, IV and 3G
OPC material were used to prepare group V, VI, VII, VIII. Samples were prepared as
follows: Group 1& V: 2mm thick specimen pressed only without layering (control
group), Group 11& VI: 1.5mm thick specimen veneered by adding one layer (0.5mm)
of veneering porcelain and glazed, Group III&IIV: 1mm thick specimen veneered by
adding two layers (0.5mm each) of veneering porcelain and glazed, Group IV & VIII:
2 mm thick specimen subjected to simulated layering and glazing firings.
Results: Tukey's post -hoc test showed that for Empress 2 groups there was a
statistically significant difference between the mean flexural strength values of group
111 and group IV, while there was no significant difference among the other groups.
For the 3G OPC there was a statistically significant difference between group VI and
group VIII. While there was no significant difference among the other groups, in
addition to that, there was a highly significant statistical difference between each
pairs of comparable groups of the two tested materials using student T-test.
Conclusion: The mean flexure strength values of Empress 2 system are significantly
higher than 3G OPC system. Veneering and heat treatment cycles did not affect the
flexure strength of the two tested materials in comparison to the pressed only
material, while core reduction reduced the flexure strength of these two systems
significantly in comparison to the heat treated materials. |
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ISSN |
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0 |
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Journal Name |
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Cairo Dental Journal |
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Volume |
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19 |
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Issue Number |
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3 |
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Publishing Year |
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2003 AH
2003 AD |
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Article Type |
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Article |
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Added Date |
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Monday, May 5, 2008 |
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Researchers
| داليا ابو العينين | Abu-Alenain, Dalia | Researcher | Doctorate | dabualenain@kau.edu.sa |
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