Article - The Properties of Metal Free Materials

Short Overview in the Properties of Metal Free Materials

Strength or beauty? Today's Dental technology market is overwhelmed with metal free products. Most popular are restorations made of lithium disilicate (e.g. Emax), tetragonal and cubic zirconia. Emax is an absolutely beautiful product with unbeatable esthetics. DentalLab.com has been manufacturing Emax restorations for more than a decade with great success.

The disadvantage of this product is due to its moderate flexural strength (360-400MPa) and need for aggressive tooth preparation (1.5 -2 mm occlusal and 1-1.5 mm proximal reduction). Furthermore, for masking capabilities and/or using layering techniques additional reduction may be necessary. We recommend using Emax for crowns, veneers, inlays and onlays.

Unlike lithium disilicate monolithic zirconia (e.g.BruxZir) does not require aggressive and often only 0.6 mm occlusal or proximal reduction may be sufficient. Due to its high flexural strength (1100-1500 MPa) monolithic zirconia may be used for crowns, multi-unit bridges and full arch screw retained restorations (e.g. Prettau screw retained bridges). Normally monolithic tetragonal Zirconia has lower translucent appearance compared to lithium dicilicate, therefore, recommended mostly for restoring posterior teeth.

Cubic monolithic Zirconia (e.g. BruxZir Anterior, Prettau Anterior, Vivid XT) has similar to Emax high translucency and relatively high flexural strength (650-750 MPa) thus allowing the practitioner more conservative preparation technique. Cubic Zirconia may be used for single crowns, veneers, inlays, onlays and up to 3 unit bridges in anterior region.

For better esthetic outcome any zirconia or Emax restoration may be facially or fully layered with feldspathic porcelain (e.g. EmaxCeram, Noritake, Creation).

HiCeram/ DentalLab.com is an authorized BruxZir and Zirkonzahn Prettau laboratory. Please call our specialists to discuss your next case so we could offer you the best restorative solution with great esthetics and functionality.