Influence of background color on chromatic value of four all-ceramic system core materials / 中华口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the influence of post-core background color on chromatic value of four all-ceramic system core materials at clinically appropriate thicknesses.</p><p><b>METHODS</b>Disc specimens of 15 mm in diameter and 0.80 mm in thickness (Empress II Group A), and 0.50 mm in thickness (In-Ceram Zirconia core Group B; Cercon base color zirconia core Group C; Cercon base zirconia core Group D) were fabricated, five in each group. Au-Pt alloy, Ni-Cr alloy and visible light cured dental composite resin (A2 color) background were prepared. Samples were put on different background and their chromatic values were measured with colorimeter (CIE-1976-L(*)a(*)b(*)). Color differences of each specimen on different background material were calculated.</p><p><b>RESULTS</b>The color differences among specimens of Group A on different background material were more than 1.5 (2.83 ± 0.70) which meant it could be noticeable to eyes. Those of zirconia were less than 1.5 [Group B (0.14 ± 0.08); Group C (0.90 ± 0.20); Group D (0.99 ± 0.09)].</p><p><b>CONCLUSIONS</b>The influence of background color on Group A was noticeable to human eyes, and as a result, tooth-colored post should be used for this all-ceramic system. For the other three kinds of zirconia core materia1 system, the color differences among specimens on different background material were unnoticeable. Therefore the three all-ceramic systems have excellent color masking ability and can be used on all color background.</p>