Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia
Cooling rate is the main fact in success and life span of all ceramic restoration through its effect on mechanical properties and producing a residual tensile stress, crack propagation and failure restorations. The goals of this study is to assess the impact of diverse cooling cycles (slow cooling...
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middle technical university
2021-09-01
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| Series: | Journal of Techniques |
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| Online Access: | https://journal.mtu.edu.iq/index.php/MTU/article/view/366 |
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| author | Shahad Hazim Ali Lateef Essa Alwan Abdul Kareem J. Al-Azzawi |
| author_facet | Shahad Hazim Ali Lateef Essa Alwan Abdul Kareem J. Al-Azzawi |
| author_sort | Shahad Hazim Ali |
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Cooling rate is the main fact in success and life span of all ceramic restoration through its effect on mechanical properties and producing a residual tensile stress, crack propagation and failure restorations. The goals of this study is to assess the impact of diverse cooling cycles (slow cooling – fast cooling) on the surface hardness of the Zirconia (VM9). A total of 30 conventional Y-TZP Zirconia (Vita VM9) disks were fabricated according manufacturers recommendation. The samples were partition into three categories depending on the cooling system. Each group consisted of ten specimens in diameter (2mm×10mm). Control group: samples are unescorted by any change. Fast cooling group: these specimens were fast cooled after second firing (910C0 -600C0) with opening Oven muffle 25% withholding time for 5 minute and remove from the furnace to cool at room temperature. Slow cooling group: specimens were slow cooled after second firing (910C0 -400C0) with opening Oven muffle 25% withholding time for 5 minute and remove from the furnace to cool at room temperature. Each specimen was subjected to hardness test in load 9.8N at 15s using Digital microvickers Hardness tester, Scanning electron microscope. The statistical analysis revealed that, the highest vickers hardness mean value was for the control group (690.57 ± 69.9563) and for second group (618.12± 53.6164) and for third group (631.75±65.3858), The facts were statistically examined by applying ANOVA test (P- value) testes which revealed significant differences(p=0.038) (p<0.05) among groups. Conclusion: The impact of cooling cycle on the hardness surface measurements of the Zirconia (Vita VM9) between the three groups was significant. The slow cooling shows a higher value of (VH) Hardness and recommended for Zirconia than the fast cooling.
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| format | Article |
| id | doaj-art-f08e34d4aeb44875a4e845df7970c14d |
| institution | Kabale University |
| issn | 1818-653X 2708-8383 |
| language | English |
| publishDate | 2021-09-01 |
| publisher | middle technical university |
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| series | Journal of Techniques |
| spelling | doaj-art-f08e34d4aeb44875a4e845df7970c14d2025-01-19T11:08:59Zengmiddle technical universityJournal of Techniques1818-653X2708-83832021-09-013310.51173/jt.v3i3.366Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic ZirconiaShahad Hazim Ali0Lateef Essa Alwan1Abdul Kareem J. Al-Azzawi2College of Health and Medical Technology, Middle Technical University, Baghdad, IraqInstitute of Medical Technology Baghdad, Middle Technical University, Baghdad, IraqAl-Rasheed University Collage/ Dentistry Department, Baghdad, Iraq Cooling rate is the main fact in success and life span of all ceramic restoration through its effect on mechanical properties and producing a residual tensile stress, crack propagation and failure restorations. The goals of this study is to assess the impact of diverse cooling cycles (slow cooling – fast cooling) on the surface hardness of the Zirconia (VM9). A total of 30 conventional Y-TZP Zirconia (Vita VM9) disks were fabricated according manufacturers recommendation. The samples were partition into three categories depending on the cooling system. Each group consisted of ten specimens in diameter (2mm×10mm). Control group: samples are unescorted by any change. Fast cooling group: these specimens were fast cooled after second firing (910C0 -600C0) with opening Oven muffle 25% withholding time for 5 minute and remove from the furnace to cool at room temperature. Slow cooling group: specimens were slow cooled after second firing (910C0 -400C0) with opening Oven muffle 25% withholding time for 5 minute and remove from the furnace to cool at room temperature. Each specimen was subjected to hardness test in load 9.8N at 15s using Digital microvickers Hardness tester, Scanning electron microscope. The statistical analysis revealed that, the highest vickers hardness mean value was for the control group (690.57 ± 69.9563) and for second group (618.12± 53.6164) and for third group (631.75±65.3858), The facts were statistically examined by applying ANOVA test (P- value) testes which revealed significant differences(p=0.038) (p<0.05) among groups. Conclusion: The impact of cooling cycle on the hardness surface measurements of the Zirconia (Vita VM9) between the three groups was significant. The slow cooling shows a higher value of (VH) Hardness and recommended for Zirconia than the fast cooling. https://journal.mtu.edu.iq/index.php/MTU/article/view/366ZirconiaCooling RateVickers Hardness (HV)Mechanical PropertiesScanning Electron MicroscopeCrack |
| spellingShingle | Shahad Hazim Ali Lateef Essa Alwan Abdul Kareem J. Al-Azzawi Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia Journal of Techniques Zirconia Cooling Rate Vickers Hardness (HV) Mechanical Properties Scanning Electron Microscope Crack |
| title | Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia |
| title_full | Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia |
| title_fullStr | Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia |
| title_full_unstemmed | Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia |
| title_short | Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia |
| title_sort | evaluation the effect of different cooling cycles on the hardness surface of the conventional feldspathic zirconia |
| topic | Zirconia Cooling Rate Vickers Hardness (HV) Mechanical Properties Scanning Electron Microscope Crack |
| url | https://journal.mtu.edu.iq/index.php/MTU/article/view/366 |
| work_keys_str_mv | AT shahadhazimali evaluationtheeffectofdifferentcoolingcyclesonthehardnesssurfaceoftheconventionalfeldspathiczirconia AT lateefessaalwan evaluationtheeffectofdifferentcoolingcyclesonthehardnesssurfaceoftheconventionalfeldspathiczirconia AT abdulkareemjalazzawi evaluationtheeffectofdifferentcoolingcyclesonthehardnesssurfaceoftheconventionalfeldspathiczirconia |