The effect of refractive index of fillers and polymer matrix on translucency and color matching of dental resin composite

Figures & data

Table 1. Classification of the experimental resins used in the study according to their composition and calculated refractive index (RI).

Experimental groups	Bis-GMA (wt%)	TEGDMA (wt%)	Camphorquinone (wt%)	DMAEMA (wt%)	RI
G1	20	80	0.7	0.7	1.477
G2	30	70	0.7	0.7	1.485
G3	40	60	0.7	0.7	1.493
G4	50	50	0.7	0.7	1.501
G5	60	40	0.7	0.7	1.508
G6	70	30	0.7	0.7	1.516
G7	80	20	0.7	0.7	1.524

Figure 1. (a) Visual image of 1 mm thick resin composite specimens placed over a black line. (b) Translucency parameter mean values (TP) of experimental resin composites. Vertical lines represent standard deviation. The same letters inside the bars represent non-statistically significant differences (p > .05) among the materials.

Table 2. Calculated refractive indices of the experimental resin composites.

Experimental groups	Series A	Series B
G1	1.514	1.521
G2	1.517	1.524
G3	1.519	1.526
G4	1.521	1.528
G5	1.523	1.530
G6	1.526	1.533
G7	1.528	1.535

Series A: 30 wt% resin + 70 wt% Schott fillers (RI 1.53).

Series B: 30 wt% resin + 70 wt% Esschem fillers (RI 1.54).

Figure 2. Representative images of different colored plastic crowns with composite restorations for visual color matching analysis. From left to right: G1A, G7A, Omnichroma, Filtek Supreme (shade A3). Shades from up to down: A1, A3, A4.