Denture tooth positioning jigs were fabricated and color data recorded by means of an intra-oral spectrophotometer and
expressed using the Commission Internationale d’Eclairage (CIE) L*a*b* color notation system. Means and standard deviations were determined. The staining data were analysed by three-way ANOVA, while the artificial ageing data were analysed by two-way ANOVA. Fisher’s PLSD intervals were calculated at a significance level of P 0.05.
Results: In the staining experiment, the main effects of stains and denture teeth and the two-way and three-way interactions among stains, denture teeth and shades were significant (P 0.05). The same was true for the main effects of denture teeth and shades and their interactions in the ageing experiment.