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| 2010-22 |
| 22-1 |
ISSN (Print) 1013-9052
EISSN 1658-3558
The Saudi Dental Journal,
P.O. Box 52500,
Riyadh 11563,
Kingdom of Saudi Arabia
P.O. Box 52500,
Riyadh 11563,
Kingdom of Saudi Arabia
| Tel. |
966-1-467-7328 |
| Fax. |
933-1-467-7308 / 966-1-467-7534 |
| Email |
saudidj@ksu.edu.sa |
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Relative fracture toughness and hardness of dental ceramics
Sharifa Al-Shehri, BDS, MS
The resistance of material to crack propagation is defined as fracture toughness (KIC) and is one measure of the strain energy absorbing ability of brittle materials. An identation technique was used to compare the apparent fracture toughness (KIC) and hardness of six dental ceramic materials to a control soda-lime-silica glass. The materials studied included Vita VMK 68 body porcelain, Optec HSP body porcelain, Dicor, IPS- Empress castable ceramics, Vitadur N core porcelain and In-Ceram core porcelain. Alumina reinforced materials (In-Ceram core) resulted in the highest fracture toughness values followed by Vitadur N core porcelain. IPS-Empress and Optec HSP materials showed moderate but statistically significant (P < 0.0001) greater values compared to conventional feldspathic porcelain Vita VMK68 and a control soda-lime-silica glass. These differences in KIC were attributed to differences in the nature of crack microstructure interaction. The hardness of Dicor castable ceramic was significantly lower than all materials tested including soda-lime-silica glass suggesting a lack of direct correlation between those two properties.
Saudi Dental Journal 2002;14(2):67-72.
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