Table 5.

Size (diameter, μm) of patent dentinal tubules

Specimane no.	Tetracycline HCL		Minocycline		Doxycycline		Citric acid
	No. of patent dentinal tubules	Mean ± SD	No. of patent dentinal tubules	Mean ± SD	No. of patent dentinal tubules	Mean ± SD	No. of patent dentinal tubules	Mean ± SD
1	24	1.43 ± 0.01	12	1.12 ± 0.01	12	1.15 ± 0.05	15	1.35 ± 0.02
2	18	1.47 ± 0.02	10	1.12 ± 0.00	12	1.12 ± 0.01	20	1.35 ± 0.01
3	26	1.47 ± 0.01	11	1.13 ± 0.01	12	1.11 ± 0.02	14	1.30 ± 0.04
4	20	1.45 ± 0.04	12	1.17 ± 0.05	10	1.11±0.015	16	1.38 ± 0.03
5	29	1.47 ± 0.02	10	1.13 ± 0.01	08	1.11 ± 0.01	13	1.35 ±0.02
6	34	1.50 ± 0.03	10	1.13 ± 0.01	08	1.11 ± 0.01	22	1.34 ± 0.05
7	27	1.49 ± 0.04	09	1.16 ± 0.05	09	1.11 ± 0.01	16	1.31 ± 0.06
8	22	1.49 ± 0.12	08	1.14 ± 0.03	04	1.11 ± 0.02	11	1.31 ± 0.06
9	22	1.49 ± 0.05	10	1.12 ± 0.01	06	1.11 ± 0.02	14	1.29 ± 0.05
10	20	1.48 ± 0.06	10	1.16 ± 0.05	12	1.12 ± 0.02	18	1.32 ± 0.04
11	24	1.44 ± 0.01	12	1.13 ± 0.01	08	1.11 ± 0.02	18	1.35 ± 0.02
12	26	1.44 ± 0.02	12	1.15 ± 0.02	10	1.11 ± 0.01	14	1.34 ± 0.01
13	20	1.45 ± 0.01	11	1.16 ± 0.02	10	1.11 ± 0.02	16	1.36 ± 0.01
14	24	1.45 ± 0.03	16	1.15 ± 0.03	12	1.10 ± 0.02	15	1.33 ± 0.04
15	18	1.46 ± 0.01	10	1.14 ± 0.01	14	1.10 ± 0.02	16	1.34 ± 0.04
16	20	1.47 ± 0.01	10	1.14 ± 0.01	08	1.11 ± 0.02	14	1.35 ± 0.03
17	22	1.47 ± 0.03	10	1.13 ± 0.02	08	1.12 ± 0.05	12	1.34 ± 0.03
18	26	1.48 ± 0.04	11	1.14 ± 0.03	10	1.11 ± 0.02	13	1.33 ± 0.02
19	26	1.47 ± 0.05	12	1.12 ± 0.01	10	1.11 ± 0.02	20	1.34 ± 0.02
20	20	1.48 ± 0.04	14	1.14 ± 0.03	08	1.13 ± 0.01	21	1.34 ± 0.02
Total	468	1.47 ± 0.02	220	1.14 ± 0.02	191	1.11 ± 0.01	300	1.33 ± 0.021

The Excel and SPSS (SPSS Inc, Chicago) software, student ‘t’, Chi-square test of significance (proportion)