Abstract
Materials and methods. 40 metal die replicas of the mandibular first molar were fabricated and distributed into two groups: control group (Zr), with porcelain veneered zirconia crowns, and test group (Sp), with crowns made with fully-sintered CAD/ CAM blocks of zirconia-reinforced lithium silicate glass-ceramics, Suprinity®. DISCUSSION This study evaluated the static fracture strength and failure mode of crowns made out of the newly introduced zirconia-reinforced lithium silicate glass-ceramics, Suprinity®, and compared them to crowns made out of the commonly used feldspathic porcelain veneered zirconium dioxide. Lots of factors can influence the results, such as the preparation design, crown dimensions, testing protocol, etc., which cannot mimic the clinical situation. [...]one needs to be very cautious in interpreting such in vitro studies, which should be followed by clinical trials to verify their outcomes. Since no material can exactly mimic natural teeth, the reader should focus on the comparative results as a whole, rather than on numerical values themselves, which may not necessarily reflect the clinical performance of the ceramic material tested.