Alloy dental material MARVALLOY

for dental restorationsposterior teeth

MARVALLOY is a high copper dental silver alloy consisting of a constant ratio of spherical and lathe cut particles. As a result of this, great handling characteristics are obtained. Its high early strength together with its low static creep value lowers the risk of marginal fracture and assures long-lasting marginal integrity. It does not contain zinc thus eliminating problems due to moisture and avoids the corrosive gamma-2 (γ-2) phase. Tin dissolves in mercury and is preferentially bound to copper thus forming Cu6Sn5 which inhibits formation of the corrosive gamma -2 phase (Sn8Hg). Chemical Composition Silver (Ag) 43%, Tin (Sn) 31.5%, Copper (Cu) 25.5% Particle Shape-Spherical /Lathe cut Ratio – Alloy : Hg = 1 : 0.99 Indications Posterior restorations Characteristics - Advantages Excellent condensability Smooth carving High resistance to wear Long lasting restoration Economical restorative Technical Data Compressive strength 1 hour (MPa) - 235 Compressive strength 24 hour (MPa) - 450 Static creep (%) - 0.10 Dimensional change (%) - 0.012 Working time - 4'30"- 5'00" Trituration time - Silamat mixer - 12"