| 000 | 03241cam a2200313 a 4500 | ||
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| 003 | EG-GiCUC | ||
| 008 | 180816s2017 ua dh f m 000 0 eng d | ||
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_aEG-GiCUC _beng _cEG-GiCUC |
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| 041 | 0 | _aeng | |
| 049 | _aDeposite | ||
| 097 | _aM.Sc | ||
| 099 | _aCai01.09.09.M.Sc.2017.No.F | ||
| 100 | 0 | _aNoura Mokhtar Nasr Sheded Alsedawy | |
| 245 | 1 | 0 |
_aFracture toughness and hardness of vita suprinity CAD/CAM with and without cyclic loading and thermocycling : _bAn in vitro study / _cNoura Mokhtar Nasr Sheded Alsedawy ; Supervised Samir Ziden , Ashraf Taher |
| 246 | 1 | 5 |
_aمتانه الكسر والقساوه للترميمات المصنعه من ماده ( فيتا سوبرينتى) بتاثير التحميل الدورى والحرارى وبدونه : _bدراسة معملية |
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_aCairo : _bNoura Mokhtar Nasr Sheded Alsedawy , _c2017 |
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_a121 P. : _bcharts , facsimiles ; _c25cm |
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| 502 | _aThesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine- Department of Prosthodontics | ||
| 520 | _aThe aim of this study is to evaluate the fracture toughness and hardness of Vita Suprinity with and without cyclic loading and thermocycling (An in-vitro study) -24 plates of 3mm thickness were cut by an isomet cutting machine. All the specimens were sintered and then auto-glazed according to manufacturer's instructions. -All specimens were stored in distilled water at 37oC for 24 hours in sealed containers in incubator. -Half of the specimens were exposed to thermal cycling with number of cycles was 500 cycle (46) , Dwell times were 25 s. in each water bath with a lag time 10 s. and The low-temperature point was 5 0C). The high temperature point was 55 0C. (46-47) and also were exposed to cyclic loading in chewing simulator machine in which Twelve specimens of experimental ceramic group were exposed to the mouth-motion fatigue at load of 50 N for 20,000 cycles with a frequency of 1.6 Hz -The other half was left with its glazed surface without any aging procedure thermocycling and cyclic loading. -Surface hardness and fracture toughness were measured before and after storage where the surface hardness was measured through Vicker{u2018}s indentation: three indentations were made in each sample and the mean was calculated for each using this equation. HV=1.854 P/d Fracture toughness was calculated by the indentation method through this equation. KIC = 0.016(E/H)-The basis of the indentation technique is a series of cracks that form under heavy loading for a certain duration in a brittle material around a Vickers diamond indenter. When viewed superiorly the cracks appear to emanate from each of the corners of the indentation. The size of these cracks expressed by the surface dimension {u2015}c,{u2016} increases with an elevating indentation load and is an inverse function of fracture toughness. The data was obtained and the results were tabulated | ||
| 530 | _aIssued also as CD | ||
| 653 | 4 | _aCAD/CAM | |
| 653 | 4 | _aCyclic loading and thermocycling | |
| 653 | 4 | _aVita suprinity | |
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_aAshraf Taher , _eSupervisor |
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| 700 | 0 |
_aSamir Ziden , _eSupervisor |
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| 905 |
_aNazla _eRevisor |
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| 905 |
_aShimaa _eCataloger |
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_2ddc _cTH |
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_c67110 _d67110 |
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