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Table 1 Mean and standard deviation of dentin thickness (mm) and volume of root canal (mm3) in each group at 3 mm and 5 mm below the cement-enamel junction before and after root canal preparation and fracture resistance (N)

From: Influence of cervical preflaring and root canal preparation on the fracture resistance of endodontically treated teeth

 3 mm Distal3 mm Mesial5 mm Distal5 mm MesialVolumeFracture resistance
BeforeAfterBeforeAfterBeforeAfterBeforeAfterBeforeAfter 
Control1.39 a (±0.15)1.09 b (±0.17)1.32 a (±0.18)1.12 b (±0.14)1.32 a (±0.14)1.06 b (±0.16)1.32 a (±0.16)1.07 b (±0.13)1.37 a (±1.11)3.11 b (±1.08)581.12 A (±117.13)
Gates1.39 a (±0.22)1.17 b (±0.18)1.36 a (±0.17)1.16 b (±0.22)1.24 a (±0.19)1.06 b (±0.21)1.21 a (±0.14)1.02 b (±0.14)1.34 a (±0.41)2.61 b (±0.56)404.59 B (±54.46)
WXN1.45 a (±0.21)1.24 b (±0.29)1.51 a (±0.25)1.25 b (±0.31)1.31 a (±0.15)1.11 b (±0.18)1.37 a (±0.22)1.15 b (±0.27)1.90 a (±0.70)3.16 b (±0.94)551.47 A (±112.83)
Easy1.57 a (±0.15)1.23 b (±0.17)1.46 a (±0.13)1.09 b (±0.12)1.39 a (±0.18)1.07 b (±0.13)1.39 a (±0.22)1.03 b (±0.15)1.65 a (±0.51)3.01 b (±0.58)521.44 A (±86.37)
  1. Different small letters denote differences in pre- and post- microCT images and after fracture resistance test (α = 0.05). Capital letters compare the groups after fracture resistance test (One-way NOVA and Tukey test). The significance level was set at 5%