Research Article
Is It Necessary to Prepare the Enamel before Dental Bleaching?
Table 3
Means and standard deviations for the values.
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| Different uppercase letters indicate statistically significant differences within columns. Different lowercase letters indicate statistically significant differences within rows. : change of luminosity after treatment of enamel; : change of luminosity immediately after bleaching; : change of luminosity 7 days after bleaching. | ||||||||||||||||||||||||||||||||