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Bleached teeth are more susceptible to stain absorption due to increased surface roughness.OBJECTIVES: The objective of this study was to evaluate the tea stain absorption on freshly bleached enamel surface after being subjected to various remineralizing agents.MATERIALS AND METHODS: Forty extracted human permanent maxillary central incisors were subjected to bleaching with 15% carbamide peroxide for 3 weeks. The teeth were then divided into four groups of 10 teeth each, according to the remineralizing agent used: [Group I: control group, which was not subjected to any remineralizing agent, Group II: acidulated phosphate fluoride (APF), Group III: casein phosphopeptide amorphous calcim phosphate (CPP-ACP) and Group IV: nano carbonate apatite (n-CAP)]. Remineralization was performed for 5 minutes daily for 1 week followed by immersion in tea solution for 10 minutes for 3 consecutive days. Spectrophotometer was used for color analysis at different periods. Data were collected and statistically analyzed using ANOVA and paired t-test (p<0.05).RESULTS: After bleaching, the n-CAP group showed the least total color change (ΔE) with a mean of (5.13 ± 1.40) and (7.85 ± 2.21) after the the 1st and 3rd staining cycles, respectively, which was significantly lower than that of the other groups.CONCLUSION: The reduction of tea stains absorption after bleaching varies according to the type of the remineralizing agents used.

EVALUATION OF COLOUR CHANGE DUE TO STAINING OF BLEACHED ENAMEL TREATED WITH DIFFERENT REMINERALIZING AGENTS