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Table 2 The 3D dentin thickness analysis of the coronal 2/3 of the root in mandibular incisors

From: Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study

 

Coronal third

Middle third

Oval

Round

Oval

Round

Mean buccal DT

Pre-

2.01 (1.87, 2.17)a

2.19 (1.98, 2.37)a

1.88 (1.78, 2.09)a

2.05 (1.90, 2.26)a

Post-

1.98 (1.87, 2.17)a

2.06 (1.69, 2.21)a

1.85 (1.77, 2.08)a

1.96 (1.86, 2.21)a

Δ%

0.00 (0.00, 0.70)a

7.25 (1.96, 11.81)b

0.58 (0.00, 1.74)a

2.22 (1.84, 4.26)b

Minimum buccal DT

Pre-

1.72 (1.55, 1.80)a

1.82 (1.72, 1.91)a

1.56 (1.45, 1.77)a

1.68 (1.50, 1.76)a

Post-

1.72 (1.55, 1.79)a

1.65 (1.30, 1.84)a

1.48 (1.44, 1.76)a

1.63 (1.43, 1.6)a

Δ%

0.00 (0.00, 0.60)a

10.26 (0.60, 18.30)b

1.18 (0.00, 5.22)a

3.55 (0.91, 5.93)a

Mean lingual DT

Pre-

2.20 (2.03, 2.43)a

2.40 (2.23, 2.60)ac

1.89 (1.77, 2.24)a

2.09 (2.00, 2.38)a

Post-

2.07 (1.97, 2.30)a

2.03 (1.95, 2.32)a

1.89 (1.76, 2.23)a

2.07 (1.98, 2.37)a

Δ%

1.82 (0.63, 6.61)a

13.48 (6.19, 15.55)b

0.00 (0.00, 0.47)a

0.48 (0.00, 2.18)a

Minimum lingual DT

Pre-

1.80 (1.56, 1.95)a

1.87 (1.75, 2.13)ac

1.51 (1.37, 1.84)a

1.73 (1.59, 1.88)a

Post-

1.71 (1.50, 1.86)a

1.64 (1.33, 1.76)a

1.51 (1.36, 1.84)a

1.72 (1.52, 1.84)a

Δ%

4.03 (0.00, 7.49)a

14.29 (2.08, 24.78)b

0.00 (0.00, 0.00)a

2.50 (0.00, 4.09)a

Mean proximal DT

Pre-

1.59 (1.40, 1.69)a

1.67 (1.54, 1.75)ac

1.30 (1.19, 1.47)a

1.44 (1,37, 1.52)ac

Post-

1.52 (1.29. 1.61)a

1.38 (1.28, 1.48)a

1.21 (1.13, 1.43)a

1.31 (1.26, 1.43)a

Δ%

6.17 (4.07, 7.56)a

16.18 (7.75, 19.88)b

4.11 (2.31, 6.40)a

5.96 (4.42, 8.24)a

Minimum proximal DT

Pre-

1.05 (0.91, 1.18)a

1.15 (0.98, 1.28)ac

0.86 (0.80, 0.93)ac

0.96 (0.81, 0.99)ac

Post-

0.95 (0.76, 1.07)a

0.98 (0.70, 1.05)a

0.71 (0.67, 0.85)a

0.79 (0.68, 0.90)a

Δ%

13.79 (4.63, 20.81)a

22.22 (9.88, 30.72)a

12.50 (8.43, 18.45)a

14.13 (8.06, 22.07)a

  1. The 3-D dentin thickness results were shown as median (P25, P75). Different lowercase letters (a or b) in the parameter columns of the same canal third indicate statistical difference between groups. Lowercase letter c indicates a significant difference between the pre-operative and post-operative values. The DT parameters were analyzed using Mann–Whitney test, P < 0.05
  2. DT dentin thickness, pre- the pre-operative parameters, post- the post-operative parameters. Δ% percentage change of dentin thickness parameters