Journal of Korean Academy of Oral Health

Table. 3. Table 3

Microhardness change on composite resin surface after treatment for 30 minutes Unit: VHN

Group	N	Treatment		△VHN**

		Before (0 min)	After (30 min)
1*	12	83.63±1.40	81.92±1.01	―1.71±0.57^a
2*	12	83.57±1.41	72.10±1.57	―11.48±1.45^d
3*	12	83.52±1.31	73.98±1.59	―9.54±1.15^c
4*	12	83.52±1.20	74.30±0.41	―9.21±1.21^c
5*	12	83.49±1.09	75.39±0.69	―8.10±0.92^b
6*	12	83.64±0.92	75.51±0.72	―8.14±0.84^b

All values are mean±standard deviation.

*P<0.05, by Paired t-test.

**P<0.05, by One way ANOVA.

^a,b,c,dThe same letter indicates no significant difference by Duncun’s test at α=0.05.

Group: 1, mineral water; 2, carbonated beverage; 3, fermented milk; 4, fermented milk+3% Ca; 5, 2% NaF+fermented milk; 6, 2% NaF+(fermented milk+3% Ca).

J Korean Acad Oral Health 2021;45:138~144 https://doi.org/10.11149/jkaoh.2021.45.3.138