Food Simulating Organic Solvents for Evaluating Crosslink Density of Bulk Fill Composite Resin

Table 2

Mean hardness number and crosslink density of the tested bulk fill composite resins after dry storage, storage in 75% ethanol, and storage in 100% methyl ethyl ketone.

Bulk fill composite resin	Dry storage	Storage in 75% E	Storage in 100% MEK
SureFill
Vickers hardness number (SD)	82.4 (2.4)	76.6 (2.1)	74.6 (1.7)
Crosslink density (SD)	—	7.0 (1.4)	9.4 (2.5)
SonicFill
Vickers hardness number (SD)	99.0 (1.3)	88.5 (1.6)	87.2 (1.8)
Crosslink density (SD)	—	10.5 (1.8)	11.9 (1.3)	0.06
		<0.000

SD: standard deviation.
value of -test comparing differences after using solvents in each material.
value of -test comparing the two materials when each solvent was used.
significant difference at .