. 2019 Mar 20;9:4921. doi: 10.1038/s41598-019-41381-0

Table 1.

Mechanical properties and the minimum value of PMMA-based denture resin according to the ISO standard (20795-2(a) and 1567(b)).

	Fracture toughness		Impact strength^b	3 point flexural test		Biological test
	Total fracture work^a	Maximum stress intensity factor^a	Impact strength^b	Ultimate flexural strength^a	Elastic modulus^a	Biological test
Standard	250 J/m²	1.1 Mpam^1/2	2 kJ/m²	50 MPa	1500 MPa	Included
0% CNT	+	+	−	+	+	Included
0.25% CNT	+	+	−	+	+	Included
0.5% CNT	+	+	−	+ down	+ down	Included
1% CNT	+ up	+	−	+ down	+ down	Included
2% CNT	+ up	+ down	− down	− down	− down	Excluded

+/− indicating whether the average value of each group met the required value from the standard or not.

Up/down indicates significant increase or decrease in average value of each group compared to the 0% control group at a level of 0.05.