This is because VPS materials have a detail reproduction of 5 to 15 µm. For an extra accurate impression, for example for crowns and bridges, vinyl polysiloxane impression (VPS) materials are often chosen. Traditionally, alginate has been used for a ‘standard print’. THE ACCURACY OF A SILICONE impression, WITH ALGINATE! Due to the pleasant bubblegum smell and the controlled viscosity that prevents the alginate from running down the throat, an impression taken with Cavex Cream is also pleasant for the patient. When mixed, the alginate powder is quickly absorbed by the water, after which an easy-to-mix, cream-like alginate mix is created that allows a perfect application on the impression tray. When developing Cavex Cream, the most important properties of a good alginate have been combined: high tensile strength and elasticity and the perfect viscosity. Cavex Cream: The latest in the Cavex family of alginates with an unrivaled 5µm detail.Cavex Orthotrace: ideal for orthodontic impressions with the extra fast setting time and unique ‘red fruit’ taste.Cavex ColorChange: alginate with a color change per stage of the impression and dimensional stability of no less than 9 days.Cavex Impressional: an unprecedentedly strong alginate.Cavex CA37: a trusted, worldwide proven solid alginate.The Cavex alginate portfolio now consists of five different alginates, each with its own specifications: But of course, Cavex has not stopped developing its alginates. This alginate, which still bears the name of the R&D process at the time: Calcium Alginate sample 37, has been eradicated as the worldwide standard for alginate. Innovations in alginateĬavex has been at the forefront of the development of high-quality dental alginates since the 1950s. Two-thirds of the alginate consists of this diatomaceous earth. Because it is important for a good impression that the impression material sets, a third ingredient is added: diatomaceous earth, or skeletons of single-celled organisms that are extracted from dried up seabed areas. The ratio of these two ingredients determines the viscosity of the final alginate. ![]() By combining this alginic acid with calcium sulfate, a gel is created. Both the permanent set and tear energy are affected by the filler particle morphology.The basis of alginate is alginic acid, which is extracted from specific types of seaweed. Bond rupture can be reduced by increasing the alginate content in the system which also raises the tear energy. Although this process of bond interchange and that of continued polymerization during deformation may be contributory mechanisms to permanent set, bond rupture appears to be the primary mechanism. The Ca2+ crosslinks bridging the alginate chains in the network appear to be labile. ![]() The gelation time is primarily controlled by the concentration of Na4P2O7 in solution acting as a retarder, while the level and particle size of the alginate and CaSO4 X 2H2O also affect the kinetics through the dissolution rates and concentration effects. Structural information was also obtained from the dependence of viscosity and compressive modulus on the calcium concentration in model systems. ![]() The setting behavior of calcium alginate impression materials was investigated by monitoring the viscosity, calcium ion activity, and shear modulus during the reaction.
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