الفهرس 
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Abstract
This study was conducted to evaluate the remineralizing effect of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and tricalcium silicate using scanning electron microscope (SEM), Energy dispersive Xray (EDX) and laser induced fluorescence device (DIAGNOdent). Materials and methods: Thirty sound human maxillary incisors (n=30) that were extracted due to periodontal diseases and collected from Oral Surgery clinic at Faculty of Dentistry, Mansoura University, according to the regulation of the ethics committee. The teeth were randomly divided into three groups (n=10); group A: control group, group B: CPP- ACP group and group C: Tricalcium silicate group with 10 samples in each group (n=10). The specimens of control group (A) were cut into two halves, one of them was used as negative sound control and the other section was subjected to demineralization process. All specimens of other remaining groups (B&C) were subjected to the demineralization process, then subdivided into two subgroups by cutting the tooth longitudinally through the center of the tooth by carbide bur. One half was left without any surface treatment, act as positive control group and the other received remineralizing treatment (test group). All specimens were measured by DIAGNOdent (DIAGNOdent pen, KAVO model 2190, Biberach, Germany) and prepared for elemental and morphological analysis by drying to ensure that the teeth moisture free. The tested groups were evaluated after 3 months, 6months and 9months. Results: The results of Kolmogorov–Smirnov and Shapiro Wilk tests revealed that all data following normal distribution. Therefore, a parametric Two-way analysis of variance test (ANOVA) was conducted. The outcomes of ANOVA test revealed that “type of remineralizing agent” and “storage time” significantly affected DIAGNOdent and EDX mean values (p˂0.05). For DIAGNOdent results, at 3 and 9 months there was a significant difference between the two materials but at 6 months, there was no statistically significant difference. For EDX outcome (calcium and phosphorus), no statistically significant difference was detected between the two remineralizing agents at 3 and 6 months but, there was a significant difference at 9 months. These results showed that the tricalcium silicate showed the highest remineralizing potential, while CPP-ACP showed the least. Conclusions: Under the limitation of this study, the outcomes reveled that tricalcium silicate performed better than CPP-ACP as remineralizing agent. Also, storage time had effect on remineralizing action of CPP-ACP and tricalcium silicate.