| Titre : | Study of the mechanical, structural and thermal properties of dental ceramics |
| Auteurs : | Sabrina Cheriet, Auteur ; Abdelouahed Chala, Directeur de thèse |
| Type de document : | Monographie imprimée |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2018 |
| Format : | 1 vol. (53 p.) / 30 cm |
| Langues: | Français |
| Mots-clés: | Zirconium oxide,heat treatment,microstructure,microhardness |
| Résumé : |
The aim of this work is to study the effect of heat treatment (sintering) on the mechanical and structural properties of zirconium oxide used in tooth replacement and restoration, in addition to the effect of thermal shock in terms of microstructure and microhardness of this material. For this, we used several experimental methods represented in X-ray diffraction, scanning electron microscopy and microhardness. We can say that this material can be used to replace natural teeth in terms of mechanical properties and therefore we suggest to study its optical properties. |
| Sommaire : |
Summary General introduction ……………………………………………………………................. 01 Chapter I: Dental materials I.1. What is a biomaterial? ………………………………………………………................ 04 I.1.1. Introduction ………………………………………………………………................ 04 I.1.2. Definition …………………………………………………………………............... 04 I.1.3. The different classes of biomaterials ………………………………………............. 05 I.1.3.1. Metallic Biomaterials ……………………………………………………............. 05 I.1.3.1.1. Pure metals …………………………………………………………….............. 05 I.1.3.1.2. Alloys …………………………………………………………………............... 07 I.1.3.1.2.a. Precious dental alloys ………………………………………………................ 07 I.1.3.1.2.b. Non-precious dental alloys …………………………………………............... 08 I.1.3.2. Ceramic biomaterials and glasses ………………………………………............... 10 I.1.3.2.1. Inert organic ceramics ………………………………………………….............. 10 I.1.3.2.2. Bioactive ceramics and bioglasses ……………………………………............... 11 I.2. Dental ceramics ……………………………………………………………….............. 11 I.2.1. Definition …………………………………………………………………............... 11 I.2.2. Historic …………………………………………………………………….............. 11 I.2.3. Classifications ………………………………………………………………........... 12 I.2.3.1. Traditional classification …………………………………………………........... 12 I.2.3.2. Microstructural classification ……………………………………………............. 13 I.2.3.2.1. Composition category 1—Glass-Based Systems ………………………............. 13 I.2.3.2.2. Composition category 2—Glass-Based Systems with Fillers ………….............. 14 I.2.3.2.3. Composition category 3—Crystalline-based Systems with Glass Fillers ............ 14 I.2.3.2.4. Composition category 4— Polycrystalline Solids ……………………............... 14 I.2.3.3. Classification based on processing technique ……………………………............ 15 I.2.4. Physical and mechanical properties of dental ceramics …………………….............. 15 I.3. Glass ceramics ………………………………………………………………................ 17 I.3.1. Historic and definition …………………………………………………….............. 17 I.3.2. Biocompatible glass-ceramics ……………………………………………................. 18 I.3.3. Properties of dental glass ceramics …………………………………………........... 19 I.4. A special ceramic: zirconia ……………………………………………………........... 19 I.4.1. Historical developments …………………………………………………….............. 19 I.4.2. Definition …………………………………………………………………….......... 20 I.4.3 Crystallography ………………………………………………………………............ 20 I.4.3.1. Monoclinic form …………………………………………………………............. 20 I.4.3.2. Tetragonal or quadratic form …………………………………………….............. 21 I.4.3.3. Cubic form ……………………………………………………………….............. 22 I.4.4. Different types of zirconia ceramics available for dental applications ……............. 23 I.4.4.1. 3Y-TZP ……………………………………………………………………............ 23 I.4.4.2. Glass-infiltrated zirconia-toughened alumina (ZTA) ……………………............... 23 I.4.4.3. Partially stabilized zirconia (Mg-PSZ) ……………………………………........... 24 I.4.5 Mechanical properties of zirconia ………………………………………….............. 25 I.4.6. Thermal properties …………………………………………………………............. 25 I.4.7. Degradation at low temperature ……………………………………………............. 25 Chapter II: Materials and experimental methods II.1. Introduction …………………………………………………………………............... 28 II.2. Used materials ………………………………………………………………............. 28 II.3. Experimental techniques used ………………………………………………............. 28 II.3.1. X-ray diffraction ……………………………………………………………............ 28 II.3.2. Heat treatment ……………………………………………………………............. 30 II.3.3. Vickers microhardness ……………………………………………………............ 31 II.3.4. SEM ………………………………………………………………………............. 33 Chapter III: Experimental results and interpretations III.1. Results of X-ray diffraction ………………………………………………................. 36 III.1.1. The X-ray diffraction of the ZrO2 sample before sintering ……………................. 36 III.1.2. The X-ray diffraction spectroscopy of the zirconia sample after sintering ............ 36 III.1.2.1. Sintering at 1000°C ……………………………………………………............ 36 III.1.2.2. Sintering at 1200°C ……………………………………………………............. 38 III.1.2.4. Sintering at 1450°C ……………………………………………………............... 39 III.2. Results of SEM (The Scanning Electron Microscopy) …………………… .............. . 40 III.2.1. Before sintering ………………………………………………………….............. 40 III.2.1. Influence of heat treatment (After sintering) …………………………….............. 41 III.3. Microhardness measurement results ………………………………………............... 43 III.3.1. Microhardness measurement of the reference …………………………................ 43 III.3.2. Influence of sintering on the microhardness ……………………………................ 44 III.4. Thermal shock results …………………………………………………….................. 45 III.4.1. For samples, which had sintered at heat treatment of 1200°C …………............... 45 III.4.2. For samples that had sintered at heat treatment of 1450°C …………….................. 49 General conclusion ………………………………………………………………............. 53 List of references …………………………………………………………………............ 56 |
| Type de document : | Mémoire master |
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