ISO 4049 – Dentistry – Polymer-based restorative materials

This International Standard specifies requirements for dental polymer-based filling and restorative materials and polymer-based luting materials supplied in a form suitable for mechanical mixing, hand-mixing, or intra-oral and extra-oral external energy activation, and intended for use primarily for the direct or indirect restoration of cavities in the teeth. The following section of the standard can be performed using an uniaxial Mach-1 mechancial tester.

Section 5.2.9 (Flexural strength, type 1 and type 2 materials) of this standard specifies that the flexural strength of type 1 and type 2 materials shall be equal to or greater than the limits specified in the following table.

Type 1	Class 1	80 MPa
	Class 2, group 1	80 MPa
	Class 2, group 2	100 MPa
	Class 3	80 MPa
Type 2	Class 1	50 MPa
	Class 2, group 1	50 MPa
	Class 3	50 MPa

As per section 7.11 , the flexural strength test is conducted on a 2x2x25 mm³ molded sample under a 3-point bending configuration (3 rods, 2 mm in diameter, bottom rods spacing of 20 mm between centers) with a constant crosshead speed of (0,75 +/- 0,25) mm/min or a rate of loading of (50 +/-16) N/min. 

As per section 7.5 of the standard, immediately after mixing material, a certain material volume (between 0,02 mL and 0,1 mL of the test material) is squeezed between 2 glass plates up to a loading of 150N. The thickness of the resulting film is measured with a 1 micron precision and must be under 50 microns (some criteria applies).