Progress in Orthodontics

Table 2 Comparison at 3-month and 6-month intervals

From: A prospective randomized clinical trial into the capacity of a toothpaste containing NovaMin to prevent white spot lesions and gingivitis during orthodontic treatment

	Decalcification index (DI)
	Number	Mean	Median	St dev	Min	Max	P value (t-test)
Baseline ReNew	24	0.33	0.21	0.34	0	1.17
Baseline crest	24	0.330	0.250	0.4	0	1.33	0.97
3 month ReNew	24	0.48	0.33	0.44	0	1.42
3 month crest	23	0.24	0.17	0.3	0	1.250	0.0403*
6 month ReNew	23	0.47	0.42	0.37	0	1.58
6 month crest	21	0.440	0.250	0.470	0	2.08	0.81
Plaque index (PI)
Baseline ReNew	24	3.04	3.250	1.33	0	4.92
Baseline crest	26	3.39	3.63	0.93	1.58	5	0.27
3 month ReNew	24	3.22	3.42	1.16	1.17	5
3 month crest	23	3.48	3.33	0.9	1.750	4.83	0.41
6 month ReNew	23	3.53	3.42	1.09	1.92	5
6 month crest	21	3.86	4.09	1.07	1	5	0.32
Gingival index (GI)
Baseline ReNew	24	2.14	2.13	0.61	1.42	3.83
Baseline crest	24	2.15	2.250	0.47	1.250	3	0.95
3 month ReNew	24	2.15	2.04	0.52	1.17	3
3 month crest	22	2.35	2.250	0.43	1.67	3.17	0.17
6 month ReNew	23	2.42	2.33	0.560	1.33	3.42
6 month crest	21	2.5	2.42	0.63	1.33	4	0.69

P value was set at 0.05 using two-sample t-test
*P < 0.05 indicating a significant difference between groups for DI at 3 months

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