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Table 4 Comparison between instruments and SEM analysis

From: Analysing root roughness and smear layer relationship by comparing contemporary dental curettes with conventional dental curettes: a randomised controlled trial

SEM analysis

Instruments

Control

n = 30 (%)

Gracey

n = 30 (%)

After-five

n = 30 (%)

Mini-five

n = 30 (%)

Roughness

    

Grade 0

5 (16.7)

0 (0)

0 (0)

0 (0)

Grade 1

22 (73.3)

1 (3.3)

04 (13.3)

0 (0)

Grade 2

3 (10.0)

17 (56.7)

05 (16.7)

07 (23.3)

Grade 3

0 (0)

12 (40.0)

21 (70.0)

23 (76.7)

Adjusted Residual

4.0

7.7

− 2.4

− 5.9

Adjusted P-value

 < 0.001*

 < 0.001*

0.017

 < 0.001*

Smear layer

    

Grade 1

0 (0)

11 (36.7)

22 (73.3)

24 (80.0)

Grade 2

6 (20.0)

15 (50.0)

06 (20.0)

05 (16.7)

Grade 3

10 (33.3)

4 (13.3)

02 (6.7)

01 (3.3)

Grade 4

14 (46.7)

0 (0)

0 (0)

0 (0)

Adjusted Residual

− 6.0

− 1.0

3.5

6.9

Adjusted P-value

 < 0.001*

0.340

 < 0.001*

 < 0.001*

  1. *Bonferroni correction (Significant at 0.05/16 = 0.0031)