Abstract

Background: Molar Incisor Hypomineralization (MIH) affects aesthetics, and its treatment should prioritize conservative approaches in children. Objective: To evaluate the clinical performance of resin infiltrant over 24 months and the satisfaction of patients and their guardians with the treatment. Design: Retrospective cohort study with 106 restorations in permanent incisors affected by MIH in patients aged 7 to 10 years treated with resin infiltration between January 2017 and August 2021 at a university dental clinic. Functional, biological, and aesthetic properties were evaluated using FDI World Dental Federation criteria, hypersensitivity with a Visual Analog Scale (VAS), and satisfaction with a Likert scale. The primary outcome was the clinical success rate defined by aesthetic improvement and hypersensitivity control. Frequencies, percentages, mean, and standard deviation were used for data analysis. Results: The overall clinical success rate of the resin infiltrant was 96.2% at 24 months. The success rate in functional, biological, and aesthetic properties was over 90% up to 24 months of follow-up. Pain on the VAS decreased from 8 to 0 points in 24 months for all opacities. Patient and guardian satisfaction was high at one and 12 months but decreased at 24 months, especially in patients with yellow-brown opacities. Conclusion: The resin infiltrant was highly effective in anterior teeth affected by MIH, improving aesthetics and reducing hypersensitivity with high initial satisfaction among patients and guardians.