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. 2016 Jan 5;11(1):e0146478. doi: 10.1371/journal.pone.0146478

Fig 2. Percentage of surface hardness loss (%SHL) on enamel and dentine, according to the treatments (mean ± SD; n = 12), and values of regression analyses between treatments by substrate.

Fig 2

Distinct capital letters indicate differences (p < 0.05) between enamel and dentine and distinct lower case letters indicate differences (p < 0.05) among fluoride treatments by substrate.