الفهرس 
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Abstract
Dental erosion is the situation of a chronic loss of dental hard tissue that is chemically etched away from the tooth surface by acids without bacterial involvement. Acid of intrinsic (gastrointestinal) and extrinsic (dietary and environmental) origins are the main etiologic factors for dental erosion.
Over the last decades, there has been a significant worldwide increase in the consumption of acidic beverages, such as soft drinks and ready-to-use fruit juices which caused increase in the prevalence of dental erosion all over the world.
The aim of this study was to analyze the impact of green tea extract versus CPP-ACPF on treatment of enamel erosion in primary teeth through microhardness testing and scanning electron microscope analysis.
Fifty two enamel specimens were prepared from freshly extracted or exfoliated human primary molar teeth. The crowns were embedded in acrylic resin with the labial or lingual enamel surface exposed. Enamel surfaces were ground flat using wet water proof fine silicon-carbide abrasive paper.
Enamel specimens had been divided into two main groups, group (I) microhardness testing and group (II) scanning electron microscope evaluation and each group was divided into four subgroups:
Subgroup1 (E1): Consisted of 10 sound enamel specimens as control.
Subgroup2 (E2): consisted of 10 enamel specimens that were submitted to an erosive lesion.
Subgroup3 (E3): Consisted of 10 enamel specimens that were submitted to an erosive lesion and then submitted to a pH cycling with immersion in the green tea solution after each erosive challenge for 3 minutes.
Subgroup4 (E4): Consisted of 10 enamel specimens that were submitted to an erosive lesion and then submitted to a pH cycling with application of CPP-ACPF paste after each erosive challenge for 3 minutes.
For group II (scanning electron microscope), twelve enamel specimens were randomly divided into 4 subgroups (S1, S2, S3, and S4) according to treatment as described above for group I.
The enamel surface microhardness of the specimens was measured in Vickers hardness number using Digital Vickers Hardness Tester.
Three measurements were recorded for each specimen from different sites all over enamel surface and their average was calculated.
SEM (Quanta FEG-250) was used to record the qualitative aspect of this study in the form of images of the enamel surface at two different magnifications (1000x and 2000x)
The results showed that:
1- The surface microhardness mean values for subgroups 3,4 have increased after pH cycling and SEM showed improvement in the enamel appearance and the surface became smooth. This was attributed to the ability of CPP-ACPF and green tea extract to remineralize the eroded enamel surfaces.
2- The surface microhardness mean value in the subgroup treated by CPP-ACPF was greater than the recorded value for green tea subgroup. Subgroup E4 (CPP-ACPF) also showed the highest percentage of surface microhardness recovery (%SMHR) compered to subgroup E3 (green tea) with insignificant difference between subgroups. This indicated that CPP-ACPF exhibits a higher remineralising potential.