Objective To investigate the influence of repeated sintering on the color of two porcelain- fused- totitanium, and the differences between the two porcelains. Methods Thirty samples were prepared and sintered for 9 times. The color of samples were measured following sintering 1, 3, 5, 7, 9 times by ShadeEye NCC colorim eter according to two brands of porcelains with CIE1976L*a*b* color system, and calculated relevant chrome, chromatism and hue, and statistical analysis. Results When two brands of porcelains were sintered 5 times, the color parameters had no significant change and sintered continuely, the color parameters of L* and a* had obvious changes, but can′t be observed by eyes. Conclusion The color parameters of titanium- porcelains have no significant change after repeated sintering.
