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Purpose: This study aimed at investigating the masking effect and depth of penetration of two resin infiltrants (ICON ® and unfilled adhesive resin) on artificial white spot lesions after different pretreatment methods (15% hydrochloric acid, 37% phosphoric acid and air abrasion through micro etcher) Materials and methods: Artificial white spot lesions were produced in enamel slabs from 60 freshly extracted permanent human anterior teeth (extracted from diabetic patients). The samples were divided into two main groups: resin infiltrant; ICON ® (B1) and adhesive resin bond; ONE-STEP® Universal Dental Adhesive (B2). Each group was subdivided into three subgroups according to the pretreatment used; (HCl 15%) was applied in (A1), (H3PO4 37%) was applied in (A2) and aluminum oxide particles (50/90 µm), through micro etcher was applied in (A3). The assessment of colour was performed by a spectrophotometer in three distinct stages: baseline, after the production of artificial caries and after infiltration treatment expressed in L*, a* and b* values. To analyze measurement results, the chromatism value, ΔE was used to quantify the overall differences of the colors. Results: All the test groups showed no statistically signifiant differences between each other where the highest value was recorded with the adhesive bond after micro-etching 2.250 ± 0.192 and the lowest value was recorded with the adhesive bond after HCl pre-treatment 1.710 ± 0.244 (Statistical significance is achieved when the P-value ≤ 0.05). Conclusion: Both tested infiltrants reacted similarly and the three tested pretreatment methods were equally effective.

Effect of Two Resin Infiltration on Color Masking of Artificial Enamel White Spot Lesion Using Different Pretreatment Methods. (An in Vitro Study)