We offer our dentists E-Max Lithium Discilicate restorations. The unique composition of lithium discilicate combines durability with esthetics, forming the strongest ceramic restoration system available today. This patented crystalline formulation can be used for either conventional or adhesive cementation without sacrificing esthetics and durability.
Cementation tips and recommendations from some of our clients:
Lithium Disilicate glass ceramics (unfired)
Flexural strength of 360-400 MPa and cut from a homogenous monolithic block of material. The strongest all ceramic material currently on the market.
IPS e.max Lithium Disilicate is a high strength ceramic material with 360-400 MPa of flexural strength. When fabricated to full-contour or in a monolithic state, lithium disilicate is an extremely durable material.
Failures in zirconia veneered restorations are the result of a very weak 90 MPa porcelain material having chewing forces exerted upon it. The 1,000 MPa zirconia substructure remains in tact but the failure of the layering porcelain is ultimately a failure of the restoration.
With monolithic lithium disilicate, the work of mastication is being done on a 360-400 MPa material. This strength is homogenous throughout the entire restoration.
Several internal Ivoclar Vivadent tests have demonstrated that the monolithic lithium disilicate is incredibly durable and that the zirconia veneered restorations fail with less load and fewer chewing cycles.
In order to validate these findings, Ivoclar Vivadent called upon the expertise of New York University. The researchers at NYU are authorities on dental materials and have conducted numerous studies investigating the longevity and performance of a wide array of dental materials.
The biocompatibility of ceramic materials in the oral environment is tested using a variety of methods (e.g.,cytotoxic testing and agar diffusion testing). In 2008, Brackett, Wataha, and others (DentalMaterials24(2008) 450-456) examined the cytotoxic response of lithium disilicate dental ceramics.They concluded “In spite of the mitochondrial suppression caused by the lithium disilicate materials in the current study ,these materials do not appear to be any more cytotoxic than other materials that are successfully used for dental restorations. The lithium disilicate materials were less cytotoxic than several commonly used composite materials (Fig.4,) and were comparable to cytotoxicity reported for several alloys and glass ionomers . Furthermore, the improvement of these materials over th e course of several weeks of aging and the relative stability of the cytotoxic response post-polishing suggests that they will perform well clinically in the long term.” Also, agar diffusion tests have been run in accordance to ISO10993-5 guide lineswww.ivoclarvivadent.us/emax/documents/lithium_disilicate_Sci_Doc.pdf and the results demonstrate the e.max materials are considered non-cytotoxic.
Reinforced glass-ceramics has been successfully used in all-ceramics in press technology for 15 years. Glass-ceramics can not only be just pressed but also milled by means of a state-of-the-art CAD/CAM technique.
IPS e.max Press are new highly aesthetic lithium disilicate glass-ceramic ingots with optimized homogeneity and high strength. They allow the fabrication of restorations with a high accuracy of fit. The strength of 400 MPa which has been unmatched to date by glass-ceramics enables conventional cementation.
In cases where the patient has non-vital teeth, it is also possible to produce pressed all-ceramic restorations with the help of IPS e.max Press, since the ingots are also available with high opacity.
IPS e.max CAD is based on the same materials technology as IPS e.max Press and ideally unites the CAD/CAM processing technique with a high-performance lithium disilicate ceramic. The IPS e.max CAD blocks are used for fabricating tooth-coloured restorations with high strength in an innovative manufacturing process.
Anterior and posterior crowns
- Anterior and premolar bridges (only IPS e.max Press)
- Implant superstructures
Independent of the processing, both glass-ceramics IPS e.max Press and IPS e.max CAD offer a natural shade effect and promote light transmission into the restoration.
Thanks to the high strength values, IPS e.max Press and CAD restorations can be adhesively, self-adhesively and conventionally cemented.
- Highly aesthetic lithium disilicate glass-ceramic
- Lifelike aesthetics independent of the shade of the prepared tooth
- Adhesive, self-adhesive and conventional cementation due to the unrivalled strength of 360-400 MPa
Wear resistance and compatibility are critical properties of all dental materials. In the case of composites, there is concern regarding the wear resistance of the restorative material. With ceramics, the concern reflects on their compatibility with opposing tooth structures. The wear of the opposing enamel byl ithium disilicate has been tested with the OHSU machine for the simulation of 5 years’ worth of wear. In comparison tooth ceramics and even enamel in this study, the wear of lithium disilicate was very low, showing a kind surface with respect to wear of any opposing dentition.