Abstract
Objectives: The effect of ceramics construction (press- able, machinable) and corrosion on flexural strength and micro-hardness was studied. Materials & Methods: Two types of ceramics were tested: IPS e-max Press and IPS e-max CAD. Forty samples were constructed and divided into 2 groups according to the type of ceramics. Each group was then subdivided into 2 subgroups. Subgroups 1 were not subjected to corrosion while subgroups 2 were subjected to corro-sion test. Finally each subgroup was divided into 2 classes according to the type of test: biaxial flexural strength, micro-hardness. Results: There was a sig-nificant difference between the two tested ceramics as regard weight loss as IPS e-max CAD recorded less weight loss than IPS e-max Press. As regard the flex-ural strength, IPS e-max CAD recorded significant higher strength than IPS e-max Press. Corroded sam- ples recorded significant lower flexural strength than non-corroded samples for the two tested ceramics. As regard the Vickers micro-hardness test, the results showed significant difference between the two tested ceramics. IPS e-max CAD recorded higher mi-cro-hardness values than IPS e-max Press. The results also showed that the corroded samples recorded no significant micro-hardness values than non- corroded samples for the two tested ceramics. Conclusions: IPS e-max CAD recorded less weight loss weight loss after being subjected to corrosion test than IPS e-max Press. The method of fabrication affected the flexural strength µ-hardness of ceramic as machinable ceramic (e-max CAD) recorded significant higher data than pressable ceramic (e-mas Press). Corrosion decreased the flexural strength of both tested ceramics but had no effect on micro- hardness.
Highlights
Advanced progress in technology and research of new dental materials has resulted in an increased number of all-ceramic systems
Each subgroup was divided into 2 classes according to the type of test: biaxial flexural strength, micro-hardness
The results showed that the corroded samples recorded no significant micro-hardness values than non- corroded samples for the two tested ceramics
Summary
Advanced progress in technology and research of new dental materials has resulted in an increased number of all-ceramic systems. [1,2] Recently, IPS e-max is an innovative all-ceramic system which covers the entire all-ceramics indication range from thin veneers to 10 units FPDs. IPS e-max delivers high strength and high esthetic materials for the press and the CAD/CAM technologies [3]. IPs e-max Press (Ivoclar Vivadent) consists of a lithium-disilicate pressed glass ceramic, but its physical properties and translucency are improved through different firing processes compared to IPs Empress 2. Emax press is a pressed glass-ceramic ingot (lithium disilicate crystals). The lithium disilicate crystals prevent the propagation of microcracks and contribute to the esthetic translucency of the Ips e.max press restorations. The lithium disilicate crystals prevent the propagation of microcracks and contribute to the esthetic translucency of the Ips e.max press restorations. [4]
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