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Effects of Microabrasion-with or without MI Paste Plus- on the Treatment of White Spot Lesions
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Purpose: To determine whether microabrasion treatment, with or without the addition of MI Paste Plus, improves the esthetics and mineral density of white spot lesions (WSLs). Materials and Methods: This in vitro prospective longitudinal study included 60 halved premolar specimens, randomly allocated to two groups. Artificial white spot lesions were created in all teeth following the Quieroz protocol. Control specimens were subjected to microabrasion treatment alone, while experimental specimens received daily MI Paste Plus® application after microabrasion. Both groups were subjected to a 28-day pH cycling protocol to test the longevity of treatment. The groups were evaluated at T1(intact enamel), T2 (WSL formation), T3 (after microabrasion), and T4 (post pH cycling). Visual appearance was assessed using photographs, which were shown using an online survey administered to dental students (36.6%) and recent dental graduates (63.4%). Enamel lightness was quantitatively assessed using spectrophotometer analysis, and mineral density was analyzed using micro CT analysis. Results: Dentists and dental students detected a greater esthetic improvement in WSLs treated with MI Paste Plus. Analysis of covariance controlling for initial differences in lightness between groups showed a statistically significant between-group difference in lightness at T4 (p<0.001), with the experimental teeth being 3.7 units lighter than controls. There were statistically significant between-group differences for the lightness changes that occurred from T3-T4 (p<0.001), as well as differences in lightness from T1-T4,(p<0.001). Apparent and material densities were significant higher (p<0.05), controls. There were statistically significant between-group differences for the lightness changes that occurred from T3-T4 (p<0.001), as well as differences in lightness from T1-T4,(p<0.001). Apparent and material densities were significant higher (p<0.05),104.62 and 29.79 units respectively, in the experimental than control group. Material density increased significantly (31.4 units) more in the experimental than control group (p<0.05) from T2-T4. Apparent density between T1-T4 decreased 17.02 units more in the control than the experimental group (p<0.05). Conclusions: Mineral density and esthetics of specimens with white spot lesions were greatly improved by treatment with microabrasion and MI Paste Plus. This minimally invasive treatment is a viable option for patients requiring treatment of white spot lesions after orthodontic treatment.
Ryan, Jennifer Michelle (2019). Effects of Microabrasion-with or without MI Paste Plus- on the Treatment of White Spot Lesions. Master's thesis, Texas A & M University. Available electronically from