Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures
The objective of this work was to evaluate biaxial-flexural-strength (σf), Vickers hardness (HV), fracture toughness (K Ic), Young's modulus (E), Poisson's ratio (ν) and porosity (P) of two commercial glass-ceramics, Empress (E1) and Empress 2 (E2), as a function of the h...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2008-09-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000300012 |
| _version_ | 1818497796555145216 |
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| author | Carla Castiglia Gonzaga Paulo Francisco Cesar Cristina Yuri Okada Catia Fredericci Flávio Beneduce Neto Humberto Naoyuki Yoshimura |
| author_facet | Carla Castiglia Gonzaga Paulo Francisco Cesar Cristina Yuri Okada Catia Fredericci Flávio Beneduce Neto Humberto Naoyuki Yoshimura |
| author_sort | Carla Castiglia Gonzaga |
| collection | DOAJ |
| description | The objective of this work was to evaluate biaxial-flexural-strength (σf), Vickers hardness (HV), fracture toughness (K Ic), Young's modulus (E), Poisson's ratio (ν) and porosity (P) of two commercial glass-ceramics, Empress (E1) and Empress 2 (E2), as a function of the hot-pressing temperature. Ten disks were hot-pressed at 1065, 1070, 1075 and 1080 °C for E1; and at 910, 915, 920 and 925 °C for E2. The porosity was measured by an image analyzer software and s f was determined using the piston-on-three-balls method. K Ic and HV were determined by an indentation method. Elastic constants were determined by the pulse-echo method. For E1 samples treated at different temperatures, there were no statistical differences among the values of all evaluated properties. For E2 samples treated at different temperatures, there were no statistical differences among the values of σf, E, and ν, however HV and K Ic were significantly higher for 910 and 915 °C, respectively. Regarding P, the mean value obtained for E2 for 925 °C was significantly higher compared to other temperatures. |
| first_indexed | 2024-12-10T18:49:50Z |
| format | Article |
| id | doaj.art-1922a35acc6e4d019b753970657daf46 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-12-10T18:49:50Z |
| publishDate | 2008-09-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-1922a35acc6e4d019b753970657daf462022-12-22T01:37:21ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392008-09-0111330130610.1590/S1516-14392008000300012Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperaturesCarla Castiglia GonzagaPaulo Francisco CesarCristina Yuri OkadaCatia FredericciFlávio Beneduce NetoHumberto Naoyuki YoshimuraThe objective of this work was to evaluate biaxial-flexural-strength (σf), Vickers hardness (HV), fracture toughness (K Ic), Young's modulus (E), Poisson's ratio (ν) and porosity (P) of two commercial glass-ceramics, Empress (E1) and Empress 2 (E2), as a function of the hot-pressing temperature. Ten disks were hot-pressed at 1065, 1070, 1075 and 1080 °C for E1; and at 910, 915, 920 and 925 °C for E2. The porosity was measured by an image analyzer software and s f was determined using the piston-on-three-balls method. K Ic and HV were determined by an indentation method. Elastic constants were determined by the pulse-echo method. For E1 samples treated at different temperatures, there were no statistical differences among the values of all evaluated properties. For E2 samples treated at different temperatures, there were no statistical differences among the values of σf, E, and ν, however HV and K Ic were significantly higher for 910 and 915 °C, respectively. Regarding P, the mean value obtained for E2 for 925 °C was significantly higher compared to other temperatures.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000300012dental glass-ceramicsinjection temperaturemechanical propertiesporosity |
| spellingShingle | Carla Castiglia Gonzaga Paulo Francisco Cesar Cristina Yuri Okada Catia Fredericci Flávio Beneduce Neto Humberto Naoyuki Yoshimura Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures Materials Research dental glass-ceramics injection temperature mechanical properties porosity |
| title | Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures |
| title_full | Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures |
| title_fullStr | Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures |
| title_full_unstemmed | Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures |
| title_short | Mechanical properties and porosity of dental glass-ceramics hot-pressed at different temperatures |
| title_sort | mechanical properties and porosity of dental glass ceramics hot pressed at different temperatures |
| topic | dental glass-ceramics injection temperature mechanical properties porosity |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000300012 |
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