Results: Pretreatment with fine aluminum oxide-coated metallic strip followed by 37% H3PO4 acid showed a larger infiltration area (51.7% ± 12.2) in almost all samples compared to pretreatment with 15% HCl acid alone (22.1% ± 13.2). Statistical analysis using t-test showed a significant difference between the two groups (P= 0.011). (Am J Dent 2016;29:3-9).
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