Table 2 Mean (s.d.) of crystal size and crystallinity changes after treatment in specimens of Group LP, Group P, Group NP and Group L

From: The effect of cold-light-activated bleaching treatment on enamel surfaces in vitro

Groups

Changes in crystal size/nm

Changes in crystallinity/%

Agent pH

LP

−2.78 (2.35)**,a,b,c

−2.548 (0.021 73)**,a,b,c

5.0

P

−2.23 (2.05)*,d,e

−2.105 (0.019 14)*,d,e

5.0

NP

−0.86 (1.21)f,g

−0.647 (0.009 12)f,g

5.9

L

−0.10 (0.15)f

−0.013 (0.000 22)f

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  1. **,*Student’s t-test indicated a statistically significant decrease in post-treatment vs. pre-treatment measure (**P<0.005, *P<0.01).
  2. Student’s t-test indicated no statistically significant difference in pre-treatment vs. post-treatment measure (P>0.05).
  3. ANOVA indicated a statistically significant difference in Group LP vs. Group NP, Group LP vs. Group L, Group P vs. Group NP and Group P vs. Group L, respectively (P<0.01).
  4. ANOVA indicated no statistically significant difference in Group LP vs. Group P and Group NP vs. Group L, respectively (P>0.05).
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