The Influence of Irradiation Time and Layer Thickness on Elution of Triethylene Glycol Dimethacrylate from SDR® Bulk-Fill Composite

Table 2

Mean TEGDMA release (µg/mL) from three groups of SDR composite resin samples measured after 1 h and 1, 3, 7, and 14 days. Between 14–21 and 21–31 days no more TEGDMA monomer was detected in any sample. The cumulative TEGDMA concentrations after 31 days are also shown. Means with same superscript symbol do not differ significantly. The other means show statistically significant () differences.

Group	Extraction solution	Immersion time					Cumulative TEGDMA conc. after 31 d (µg/mL)
		1 h	1 h–24 h	1–3 d	3–7 d	7–14 d
		TEGDMA (g/mL) mean (SD)
Control 4/20	100% ethanol	7.46 (0.20)	4.00 (0.16)	1.74 (0.08)	1.28 (0.06)	0.78 (0.02)	15.26 (0.52)
	75% ethanol	6.49 (1.39)	2.69 (0.16)	0.91 (0.03)	bl	—	10.09 (1.58)
	Distilled water	3.71 (0.28)	1.59 (0.22)	0.83 (0.12)	—	—	6.13 (0.62)
4/40	100% ethanol	7.70 (0.48)	4.16 (0.17)	1.69 (0.05)	1.30 (0.13)	0.97 (0.04)	15.82 (0.69)
	75% ethanol	5.16 (0.43)	1.49 (0.07)	0.61 (0.03)	bl	—	7.26 (0.53)
	Distilled water	2.82 (0.32)	1.07 (0.04)	0.51 (0.01)	—	—	4.4 (0.37)
2/20	100% ethanol	6.26 (0.44)	3.45 (0.10)	1.44 (0.14)	0.88 (0.02)	bl	12.03 (0.49)
	75% ethanol	4.58 (0.17)	1.26 (0.02)	0.67 (0.02)	bl	—	6.51 (0.21)
	Distilled water	1.84 (0.05)	1.21 (0.01)	0.56 (0.03)	—	—	3.61 (0.09)

—: not detected; bl: below quantification limit.