Use of Artificial Neural Network in Determination of Shade, Light Curing Unit, and Composite Parameters’ Effect on Bottom/Top Vickers Hardness Ratio of Composites

Table 1

Materials and their composition.

Material Type	Organic Matrix	Inorganic Matrix	Photoinitiator	Shades
Clearfil Majesty	Bis-GMA,	Barium glass, silica	Camphorquinone	HO
Esthetic	TEGDMA	(85.5 wt%)	(468 nm)	A2
				B2
Tetric N Ceram	Bis-GMA-	Barium glass,	Lucirin TPO3	Bleach L
(Ivoclar	UDMA (15%),	ytterbium trifluoride,	(350-425 nm)	Bleach M
Vivadent AG,	Bis-EMA (3.8%)	oxides, silicon	+
Schaan,		dioxide (63.5%)	Ivocerin
Liechtenstein)		prepolymers (17%)	(370-460 nm)
			+
		81wt %, 55-57 vol%	camphorquinone
			(468 nm)
Tetric Evo	Bis-GMA,	Barium glass,	Lucirin TPO3	Bleach L
Ceram (Ivoclar	UDMA,	ytterbium trifluoride,	(350-425 nm)	Bleach M
Vivadent AG,	Bis-EMA	mixed oxide (48.5%)	+
Schaan,	(16.8%)	prepolymers (34%)	Ivocerin
Liechtenstein)			(370-460 nm)
		80 wt%, 61 vol%	+
			camphorquinone
			(468 nm)