SUMMARY: ISO testing of Crystal Ultra resulted in approximately 155 MPa to 205 MPa in Flexural strength depending on the testing methodology employed. Our published number of 175 MPa is based upon the 3-point bending testing using the most universally accepted international standards. All testing methods far exceed both FDA and European standards for dental ceramics. For a more useful strength comparison, Crystal Ultra recommends analyzing Compressive Strength, which better simulates the chewing stresses found in the mouth.
SCIENCE: DLMS has not been able to confirm the flexural strength results of our competitors products, and so no apples-to-apples comparison of flexural stength has been conducted of the comparable ceramic dental materials. However, all dental material manufacturers must exceed 100 MPa in flexural strength in order to be registered with the FDA, and they must exceed 50 MPa under European standards, and we believe that all materials meet this basic standard.