Evaluation of the Color and Optical Properties of Estelite Omega

Objectives: The aim of this study was to evaluate the color and optical properties of the newly developed resin composite system, Estelite Omega, compared to various resin composites.

Materials and Methods: Specimens (7mm diameter, 3mm thickness) of Estelite Omega (EO, Tokuyama dental), Estelite Sigma Quick (EQ, Tokuyama dental), Filtek Supreme XTE (SX, 3M ESPE), Premise (PR, Kerr), EsthetX-HD (EH, Dentsply), and Empress Direct (ED, Ivoclar Vivadent) with dentin shades of A1, A2 and A3 were cured according to the manufacturer's recommendation (Optilux LCT, Kerr). Lightness (L*) and chroma (C*) were measured by the color analyzer (TC-1800MKII, Tokyo-densyoku) with CIE L*a*b* system on black background. Total transmittance (20mm diameter, 0.5mm thickness) was measured by the haze-meter (NDH-2000, Nippon-densyoku).

Results: L* and C*, and total transmittance values were summarized in the table.

Products [shade]	L*	C*	Total Transmittance[%]
	A1 / A2 / A3	A1 / A2 / A3	A1 / A2 / A3
EO [DA1-DA3]	59.84/ 60.12/60.42	6.41/8.55/10.98	65.08/63.06/60.01
ES [OA1-OA3]	60.06/56.42/58.16	4.33/6.61/10.66	65.71/65.08/64.99
SX [A1B-A3B]	58.26/56.52/55.78	3.58/6.44/9.04	70.44/71.48/69.86
PR [Body A1-A3]	58.95/54.84/54.48	5.40/7.65/9.54	70.71/69.31/72.82
EH [A1-A3]	61.66/57.04/58.44	1.87/4.12/7.70	65.12/67.02/66.39
ED [Dentin A1-A3]	63.51/65.04/63.51	4.61/9.03/9.38	65.89/62.98/61.75

Conclusions: Total transmittance of EO decreased with increasing chroma, while L* remained constant relative to the other resin composites.