| 000 | 05779namaa22004091i 4500 | ||
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| 003 | OSt | ||
| 005 | 20250223033428.0 | ||
| 008 | 250209s2023 |||a|||f m||| 000 0 eng d | ||
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_aEG-GICUC _beng _cEG-GICUC _dEG-GICUC _erda |
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_aeng _beng _bara |
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| 049 | _aDeposit | ||
| 082 | 0 | 4 | _a617.695 |
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_a617.695 _221 |
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| 097 | _aPh.D | ||
| 099 | _aCai01.09.10.Ph.D.2023.Ma.M | ||
| 100 | 0 |
_aMariam Adel Hosny Mohamed, _epreparation. |
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| 245 | 1 | 0 |
_aMechanical characterization of an experimental newly formulated resin infiltrated lithium-disilicate ceramic network versus resin infiltrated feldspathic ceramic network : _bIn-vitro study / _cby Mariam Adel Hosny Mohamed ; Supervisors Prof. Dr. Ahmed Nour El-Din Ahmed Habib, Prof. Dr. Moustafa Aboushlieb. |
| 246 | 1 | 5 |
_aتقييم الخواص الميكانيكية لمادة تجريبية مصنوعة حديثا من شبكة السيراميك ليثيوم ديسيليكاتي المطعمة ب الراتنج مقابل شبكة السيراميك فيلدسباثيك المطعمه ب الراتنج : _bدراسة معملية / |
| 264 | 0 | _c2023. | |
| 300 |
_a105 pages : _billustrations ; _c25 cm. + _eCD. |
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| 336 |
_atext _2rda content |
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| 337 |
_aUnmediated _2rdamedia |
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| 338 |
_avolume _2rdacarrier |
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| 502 | _aThesis (Ph.D)-Cairo University, 2023. | ||
| 504 | _aBibliography: pages 61-66. | ||
| 520 | _aAim: Mechanical properties of Polymer infiltrated ceramic network (PICN) range between that of resin-based composites and ceramics. Ongoing research on experimental PICNs shows impressive and promising results in terms of mechanical properties. The aim of this study was to evaluate the mechanical properties of a newly fabricated resin infiltrated lithium disilicate ceramic CAD/CAM block, in terms of; fracture load, flexural strength, fracture toughness, hardness and brittleness. Commercially available resin infiltrated feldspathic ceramic network was used as control. Methodology: IPS e.max CAD/CAM blocks were grinded into powder and used to produce porous ceramic network (25% porosity). Methylmethacrylate resin was infiltrated and polymerized to form a dense PICN. Porosity percentage and microstructure were investigated. Crowns were milled from newly fabricated PICN blocks and Vita Enamic then fracture load test was performed. Rectangular specimens were prepared from both materials, afterwards, flexural strength, fracture toughness, brittleness and Vickers’ hardness tests were investigated. Data were analyzed by independent sample-t test and paired sample-t test (α = 0.05, n = 12). Results: Newly formulated PICN had significantly higher fracture resistance (1640 N), fracture toughness (2.6 MPa m1/2) and lower brittleness index (0.89 μm1/2) compared to Vita Enamic (p < 0.001). In addition, no significant difference was found between the two materials in terms of hardness (p= 0.68) and flexural strength (p = 0.87). Conclusion: Newly fabricated PICN material showed enhanced mechanical properties that can justify its selection and clinical application for successful restorative treatments | ||
| 520 | _aMechanical properties of Polymer infilterated ceramic network (PICN) range between that of resin-based composites and porcelains. Ongoing studies on experimental PICNs shows promising results indicating that the mechanical properties of PICN can be enhanced by optimizing its chemical composition. The aim of this study is to evaluate the mechanical properties of a newly fabricated resin infiltrated ceramic CAD/CAM block where ceramic network is composed of glass-ceramic (lithium disilicate), in terms of ; flexural strength, fracture toughness, hardness, brittlness index and fracture load. Then compare it with commercially available resin infiltrated feldspathic ceramic network. Lithium disilicate CAD/CAM blocks were grinded into powder and used to produce a sintered porous ceramic network (25% porosity). Then, resin was infiltrated and polymerized to form a dense newly fabricated PICN. Rectangular specimens were prepared from both materials (n=12), Afterwards, flexural strength, fracture toughness, brittlnes index and Vickers’ hardness tests were investigated. Crowns were milled from newly fabricated PICN blocks and Vita Enamic (n=12) then fracture load test was performed. Results of this study showed that newly formulated PICN has significantly higher fracture load, fracture toughness and lower brittlness index compared to Vita Enamic. In addition, no significant difference was found between the two materials in terms of hardness and flexural strength . Those properties provides resistance against mechanical failure during occlusal loading while improving the millability of the material. This study results of newly fabricated PICN material can justify its selection and clinical application for successful and safe restorative treatments, however, further clinical studies are required in order to infer about the long-term behavior of this PICN in comparison with the already pre-established success and longevity of restorations with the classic ceramic-based restorative materials. | ||
| 530 | _aIssues also as CD. | ||
| 546 | _aText in English and abstract in Arabic & English. | ||
| 650 | 7 |
_aMaterials science _2qrmak |
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_aDisilicate Versus _aCharacterization _aFeldspathic _aCeramic Network |
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| 700 | 0 |
_aAhmed Nour El-Din Ahmed Habib _ethesis advisor. |
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_b01-01-2023 _cAhmed Nour El-Din Ahmed Habib _cMoustafa Aboushlieb _dTaheya Moussa _dEl-Sayed Gad Eid Gad El-Sayed _UCairo University _FFaculty of Dentistry _DDepartment of Dental Materials science |
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_aShimaa _eHuda |
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| 942 |
_2ddc _cTH _e21 _n0 |
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| 999 | _c170690 | ||