The study collects Sixty non carious sound human permanent premolars from Tanta University's maxillofacial surgery department. The teeth are cleaned and prepared, and randomly assigned into four groups. The specimens are analyzed using an EDX analysis scanning electron microscope, and surface micro-hardness is determined using a Digital Display Vickers Micro-hardness Tester.
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concentration of calcium and phosphorous in demineralized enamel
Timeframe: 6 weeks
enamel hardness
Timeframe: 6 weeks