Fluoride ion emission, shear bond strength, and adhesive remnant index of calcium fluoride nanoparticles-containing orthodontic primer: an In Vitro study

Figure 1.

Figure 2.

Shapiro–Wilk test results for Group A (Control/0% nCaF2-containing orthodontic primer)

Day	Statistic	df	p
1	0.840	7	0.099
2	0.664	7	0.001*
3	0.000	7	0.000*
4	0.000	7	0.000*
5	0.000	7	0.000*
6	0.000	7	0.000*
7	0.000	7	0.000*
8	0.000	7	0.000*
9	0.000	7	0.000*
10	0.000	7	0.000*
11	0.000	7	0.000*
12	0.000	7	0.000*
13	0.000	7	0.000*
14	0.000	7	0.000*

Shapiro–Wilk test (Normality test) for SBS

Group	Statistic	df	p
Control	0.888	7	0.262
20%	0.901	7	0.340
30%	0.917	7	0.444
40%	0.890	7	0.277

Levene test for SBS

	Levene stat	df1	df2	p
Based on mean	1.962	3	24	0.147

Frequency of adhesive remnant index scores between groups

	Frequency
Group	0	1	2	3
Control	1 (100.0%)	2 (14.29%)	4 (40.0%)	0 (0.0%)
20%	0 (0.0%)	4 (28.57%)	2 (20.0%)	1 (33.33%)
30%	0 (0.0%)	2 (14.29%)	3 (30.0%)	2 (66.67%)
40%	0 (0.0%)	6 (42.86%)	1 (10.0%)	0 (0.0%)

Mean, standard deviation, and range (minimum - maximum) of the fluoride ion releases for each group

	Control				20% nCaF2				30% naFC2				40% nCaF2
	Mean	SD	Min	Max	Mean	SD	Min	Max	Mean	SD	Min	Max	Mean	SD	Min	Max
Day 1	0.019	0.007	0.01	0.03	0.066	0.010	0.05	0.08	1.329	0.206	1.10	1.60	1.971	0.1 1 1	1.80	2.10
Day 2	0.004	0.005	0.00	0.01	0.041	0.009	0.03	0.05	0.869	0.385	0.90	1.10	1.086	0.107	1.00	1.30
Day 3	0.000	0.000	0.00	0.00	0.01 1	0.004	0.01	0.02	0.083	0.018	0.06	0.1 1	0.120	0.022	0.09	0.15
Day 4	0.000	0.000	0.00	0.00	0.016	0.008	0.01	0.03	0.036	0.024	0.01	0.07	0.051	0.042	0.00	0.1 1
Day 5	0.000	0.000	0.00	0.00	0.01 1	0.004	0.01	0.02	0.013	0.008	0.00	0.02	0.043	0.035	0.00	0.09
Day 6	0.000	0.000	0.00	0.00	0.014	0.010	0.00	0.03	0.006	0.005	0.00	0.01	0.026	0.025	0.00	0.07
Day 7	0.000	0.000	0.00	0.00	0.010	0.006	0.00	0.02	0.010	0.006	0.00	0.02	0.021	0.015	0.01	0.05
Day 8	0.000	0.000	0.00	0.00	0.010	0.006	0.00	0.02	0.01 1	0.004	0.01	0.02	0.026	0.008	0.02	0.04
Day 9	0.000	0.000	0.00	0.00	0.01 1	0.004	0.01	0.02	0.013	0.008	0.01	0.03	0.017	0.008	0.01	0.03
Day 1 0	0.000	0.000	0.00	0.00	0.01 1	0.004	0.01	0.02	0.009	0.004	0.00	0.01	0.014	0.008	0.01	0.03
Day 1 1	0.000	0.000	0.00	0.00	0.01 1	0.004	0.01	0.02	0.009	0.004	0.00	0.01	0.01 1	0.004	0.01	0.02
Day 12	0.000	0.000	0.00	0.00	0.009	0.004	0.00	0.01	0.009	0.004	0.00	0.01	0.013	0.005	0.01	0.02
Day 1 3	0.000	0.000	0.00	0.00	0.007	0.005	0.00	0.01	0.003	0.005	0.00	0.01	0.019	0.009	0.01	0.03
Day 14	0.000	0.000	0.00	0.00	0.007	0.008	0.00	0.02	0.007	0.005	0.00	0.01	0.019	0.007	0.01	0.03

Shapiro–Wilk test results for Group C (30% nCaF2-containing orthodontic primer)

Day	Statistic	df	p
1	0.888	7	0.000*
2	0.538	7	0.000*
3	0.955	7	0.772
4	0.902	7	0.346
5	0.833	7	0.086
6	0.664	7	0.001*
7	0.777	7	0.024*
8	0.453	7	0.000*
9	0.453	7	0.000*
10	0.453	7	0.000*
11	0.453	7	0.000*
12	0.453	7	0.000*
13	0.600	7	0.000*
14	0.600	7	0.000*

Mean, standard deviation, and range (minimum – maximum) of shear bond strength

Group	Mean	SD	Min	Max
Control	9.50	2.08	7.15	13.11
20%	10.70	3.00	7.65	16.28
30%	9.61	1.74	6.59	12.50
40%	5.44	3.72	1.95	11.93

Kruskal Wallis ANOVA test results for differences of mean fluoride ion released between the four groups

Day	Kruskal–Wallis H	p-value
1	25.491	0.000*
2	20.590	0.000*
3	25.153	0.000*
4	16.195	0.001*
5	13.351	0.004*
6	11.750	0.008*
7	17.334	0.001*
8	22.755	0.000*
9	19.897	0.000*
10	19.890	0.000*
11	20.431	0.000*
12	18.680	0.000*
13	18.105	0.000*
14	16.819	0.001*

Friedman ANOVA test results for pairwise differences in the mean fluoride ion released between the four groups

				95% Confidence interval
Group	Mean difference	Std error	p-value	Lower bound	Upper bound
Control
20%	-0.0153	0.00091	0.000*	-0.0184	-0.0122
30%	-0.1701	0.01094	0.000*	-0.2102	-0.1300
40%	-0.2439	0.00766	0.000*	-0.2719	-0.2158
20%
Control	0.0153	0.00091	0.000*	0.0122	0.0184
30%	-0.1548	0.01097	0.000*	-0.1948	-0.1148
40%	-0.2286	0.00770	0.000*	-0.2565	-0.2006
30%
Control	0.1701	0.01094	0.000*	0.1300	0.2102
20%	0.1548	0.01097	0.000*	0.1148	0.1948
40%	-0.0738	0.01335	0.001*	-0.1159	-0.0317
40%
Control	0.2439	0.00766	0.000*	0.2158	0.2719
20%	0.2286	0.00770	0.000*	0.2006	0.2565
30%	0.0738	0.01335	0.001*	0.0317	0.1159

Shapiro-Wilk test results for Group B (20% nCaF2-containing orthodontic primer)

Day	Statistic	df	p
1	0.937	7	0.609
2	0.818	7	0.062
3	0.453	7	0.000*
4	0.769	7	0.020*
5	0.453	7	0.000*
6	0.937	7	0.609*
7	0.777	7	0.024*
8	0.777	7	0.024*
9	0.453	7	0.000*
10	0.453	7	0.000*
11	0.453	7	0.000*
12	0.453	7	0.000*
13	0.600	7	0.000*
14	0.833	7	0.086*

Post-hoc pairwise comparison of shear bond strength

Group	Mean difference	p	95% Confidence interval
			Lower bound	Upper bound
Control
20%	-1.20	0.845	-5.249	2.848
30%	-0.11	1.000	-4.161	3.935
40%	4.06*	0.049	0.015	8.111
20%
Control	1.20	0.845	-2.848	5.249
30%	1.09	0.880	-2.961	5.135
40%	5.26*	0.008	1.216	9.312
30%
Control	0.11	1.000	-3.935	4.161
20%	-1.09	0.880	-5.135	2.961
40%	4.18*	0.041	0.128	8.225
40%
Control	-4.06*	0.049	-8.111	-0.015
20%	-5.26*	0.008	-9.312	-1.216
30%	-4.18*	0.041	-8.225	-0.128

Shapiro-Wilk test results for Group D (40% nCaF2-containing orthodontic primer)

Day	Statistic	df	p
1	0.922	7	0.482
2	0.781	7	0.026*
3	0.978	7	0.949
4	0.928	7	0.533
5	0.916	7	0.443
6	0.909	7	0.391
7	0.816	7	0.590
8	0.769	7	0.200
9	0.833	7	0.086
10	0.646	7	0.010*
11	0.453	7	0.000*
12	0.600	7	0.000*
13	0.818	7	0.062
14	0.840	7	0.099