Effect of thickness on color and translucency of a multi‐color polymer‐infiltrated ceramic‐network material
Javier Ruiz‐López, Cristina Espinar, Cristina Lucena, Juan de la Cruz Cardona, Rosa Pulgar, María del Mar Pérez Gómez
Abstract
Abstract Objectives To evaluate the effect of thickness on color and translucency of a multi‐color polymer‐infiltrated ceramic‐network (PICN) material. Methods Specimens of 0.5, 1.0, 1.5 mm thicknesses were obtained by sectioning VITA ENAMIC® multiColor (E‐MC) High Translucent CAD‐CAM blocks (1M1‐HT, 1M2‐HT, 2M2‐HT, 3M2‐HT, and 4M2‐HT). Spectral reflectance and color coordinates were measured on white and black backgrounds using a spectroradiometer, CIE D65 illuminant and CIE 45°/0° geometry. CIEDE2000 color and translucency differences (Δ E 00 and ΔTP 00 ) between thicknesses and adjacent layers were evaluated using their respective 50:50% perceptibility and acceptability thresholds (PT 00 and AT 00 ). Results In general, Δ E 00 between thicknesses for all shades and layers were above AT 00 in general. Chroma decreased from cervical to incisal layers with statistically significant differences ( p < 0.05), and Δ E 00 between sequential layers were above PT 00 , for all shades and thicknesses. TP 00 decreased from 0.5 to 1.5 mm and increased from cervical to incisal layers for all shades with statically significant translucency differences ( p < 0.05). In general, for all thicknesses, TPT 00 < ΔTP 00 < TAT 00 for sequential layers. Conclusions The gradient in color and translucency of E‐MC PICN material was influenced by the thickness of the CAD‐CAM block. In addition, color and TP transition values between the layers depends on the thickness and shade. Clinical significance The effect of thickness must be taken into account by dental technicians and dentists when CAD‐CAM multicolor PICN materials are used.