Effect of processing methods on the chipping resistance of veneered zirconia.

Objectives: To evaluate the edge chipping resistance (R) and the fracture toughness (K) of 3Y-TZP bilayers produced with the following materials/processing combinations: fluorapatite glass-ceramic applied on zirconia using the traditional layering and hot-pressing (press-on) techniques; feldspathic porcelain using rapid layer technology (RLT); and lithium disilicate glass-ceramic using CAD-on method. The influence of the cooling rate (slow and fast) was analyzed for layering and hot-pressing.

Methods: Bilayer bars (25x4x2 mm) were made following manufacturers' instructions.