Güçlendirilmiş dental seramiklerin vickers sertlikleri ve yük altında kırılma davranışları
| Autor: | Bulent Gokce, Celal Artunc, M Çömlekoglu, M Gungor, Mine Dundar, Mutlu Ozcan |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Cumhuriyet Dental Journal, Vol 12, Iss 2, Pp 119-120 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1302-5805 2146-2852 |
| Popis: | Objective: The objectives of this study were to determine the Vicker`s hardness of reinforced dental ceramics and determine the modes of fractures under load. Methods: Four ceramic core groups (n=7/group) from leucite (Evopress,Wegold&De), low leucite (Finesse, Ceramco), glass-infiltrated (Inceram Alumina,Vita) and lithium disilicate materials (E.max press, Ivoclar) were fabricated according to each manufacturers’ instructions (thickness: 3 mm, diameter: 5 mm). Their individual veneering ceramics were vibrated, condensed in a stainless steel mold (diameter: 5 mm, height: 5 mm) and fired on the core materials. The specimens were stored in distilled water at 37°C for 24 hours prior to indentation tests and embedded in polyesther moulds. Vickers hardness values (DUH±SD) were measured (cross-head speed:7,2 gf/s, load:200 gf) and statistically analysed (ANOVA). A load of 400 N was applied on the surfaces of specimens with a diamond indentor (diameter:1 mm) at the macro hardness test machine for crack formation. The crack modes for each group were observed under the scanning electrone microscope. Results: The Vickers hardness values for low leucite veneering ceramic were significantly (P |
| Databáze: | Directory of Open Access Journals |
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