الفهرس 
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Abstract
The aim of the present study was to evaluate the impact of various strategies of RI versus chemicals containing remineralizing paste versus chemical free herbal dentifrices on color improvement of white spot lesion and hypocalcified tooth structure using digital photographs and colorimeter software under standardized conditions. Fifteen patients were recruited from the Restorative and Orthodontic Clinic at the University of Minia for this clinical study. All patients were aware with the goals, risks, and nature of the research and were required to sign informed consent forms prior to enrollment.
Prior to the conduct this study, ethical approvals were taken from the University Ethical and Review Board. The study was on subjects who fulfilled the eligibility criteria and then, were enrolled and allocated to four groups randomly. The interventions were carried out by applying resin infiltration, Remin Pro, RTB’s and HCC to WSLs which were close in size and shape. Digital photographs were taken within standardized circumstances using a fixed a digital camera. The camera used was Nikon D7200 (Nikon, Tokyo) with a Nikon macro lens 100 mm (Rokkor-X, Minolta, Tokyo) and a point source flash positioned at a fixed focal distance from the patient.
Images were taken at the following points: Before treatment (T1) and after treatment (T2). Analysis of the digital images (RAW-format) were carried out after conversion to TIFF format with 16-bits image resolution (RAW-image converter) using Photoshop CS5 (Adobe, San Jose, USA). Optical results were analyzed using the CIE L*a*b* color system.
Color of lesions significantly improved after resin infiltration compared to the RP and the herbal materials. Color change was also clinically recognizable (DE > 3.7) between the baseline condition and after RI. When caries has been formed on the enamel substrate, pores are formed. Once these pores are filled with resin rather than water or air, the masking effect has been revealed. This can be clarified by the index of refraction of the resin used for RI, which is quite close to the refraction index of sound enamel, and encourages the retrieval of the original lightness of the enamel. The infiltrated resin substitutes water or air in the intercrystal spaces of the enamel. Regarding the herbal groups, color improvement and masking of the WSLs were clinically and statistically insignificant.