الفهرس 
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Abstract
This study was conducted to compare the effect of three remineralizing
agents on microhardness of bleached enamel. In total, 85 bovine specimens
were randomly assigned into 15 groups (n=5) according to two levels of
investigation in this study. Level 1: type of remineralizing agent, level 2: time
interval. In addition, two control groups for ground and bleached enamel were
used for comparison. After preparation of bovine teeth, Opalescence PF 20%
bleaching gel was applied and rinsed according to manufacturer instructions
to all specimens except ground enamel group (positive control). Specimens
were subjected to three different remineralizing agents CPP-ACPF (MI Paste
Plus®), Hydroxyapatite based cream (Remin Pro) and ƒTCP (Clinpro White
Varnish™) for different time intervals two, five, seven, fifteen and thirty days.
Microhardness of all specimens was measured using Vicker’s
microhardness tester. Microhardness of specimens was compared with the
microhardness of ground and bleached enamel groups. A representative
specimen from each group was randomly assigned to be evaluated under
environmental scanning electron microscope. Mean and standard deviation for
microhardness of all specimens was calculated. Two-way ANOVA revealed
that remineralizing agents and time intervals had significant effect on
microhardness of bleached enamel. Difference in type of remineralizing
agents showed significant effect on bleached enamel microhardness. ƒTCP
(Clinpro White Varnishä) showed the highest significant effect on
microhardness followed by Remin Pro then CPP-ACPF (MI Paste Plusâ).
Different time intervals also showed statistically significant effect on
microhardness of bleached enamel. Fifteen and thirty days were statistically
significantly higher compared to two, five and seven days. Remin Pro
demonstrated comparable results to ƒTCP (Clinpro White Varnishä) at two,
five and seven days, but performed less at fifteen and thirty days. Also, CPP ACPF (MI Paste Plusâ) performed the least at two, five and seven days, and
achieved comparable results to both ƒTCP (Clinpro White Varnishä) and
Remin Pro in fifteen and thirty days.