Analysis of Erosive Nature of Fruit Beverages Fortified with Calcium Ions: An In Vitro Study Evaluating Dental Erosion in Primary Teeth

Table 2

Inter- and intragroup comparison of Ra (arithmetic average of surface roughness), Rz, and microhardness in groups C and D.

Duration of exposure	Group C		Group D		-value^†
	Mean	SD	Mean	SD
Ra value (μm)
Baseline^a	6.29	0.55	4.82	0.71	<0.001
10 min^b	6.13	0.43	5.66	1.06	0.209
20 min^c	5.97	0.81	5.99	1.05	0.953
30 min^d	5.67	0.54	6.23	1.04	0.15
-value^‡	0.115		0.001
Post hoc test	—		c, d > a
Rz values (μm)
Baseline^a	22.12	2.40	17.03	2.39	<0.001
10 min^b	20.80	1.21	19.42	3.75	0.291
20 min^c	20.30	2.00	19.98	3.63	0.811
30 min^d	19.74	1.46	22.39	4.99	0.136
-value^‡	0.005		<0.001
Post hoc test	a > c, d		d > a
Microhardness (HV/10)
Baseline^a	345.61	7.94	343.58	5.22	0.509
10 min^b	355.54	10.53	336.02	5.88	<0.001
20 min^c	358.21	11.15	332.12	4.53	<0.001
30 min^d	359.44	12.36	327.58	3.11	<0.001
-value^‡	<0.001		<0.001
Post hoc test	b, c, d > a		a > b > c, d

Note. Ra: arithmetic average of surface roughness, Rz: mean of 5 surface roughness, ^‡-value for intragroup comparisons, and ^†-value for intergroup comparisons.