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Table 1 Mean dimensions (mm) of randomly assigned mandibular first premolar roots in each group

From: An in vitro study evaluating the effect of ferrule design on the fracture resistance of endodontically treated mandibular premolars after simulated crown lengthening or forced eruption methods

Group
(N = 40)
Root Lengtha Width of canal wall sites, and roots, at root facea
Mesial Buccal Distal Lingual M-D B-L
F0 15.12 (0.36) 2.19 (0.30) 2.55 (0.15) 2.17 (0.41) 2.36 (0.26) 6.18 (0.97) 8.16 (0.73)
CL/F1 15.16 (0.35) 2.04 (0.41) 2.40 (0.43) 1.92 (0.19) 2.43 (0.20) 5.66 (0.58) 7.88 (0.63)
CL/F2 15.18 (0.27) 2.47 (0.54) 2.63 (0.37) 2.12 (0.33) 2.60 (0.34) 6.40 (0.77) 8.25 (0.52)
OE/F1 15.12 (0.26) 2.06 (0.37) 2.47 (0.27) 2.00 (0.42) 2.52 (0.38) 5.89 (0.96) 8.07 (0.70)
OE/F2 15.19 (0.42) 2.18 (0.30) 2.65 (0.30) 2.11 (0.33) 2.66 (0.36) 6.26 (0.60) 8.13 (0.35)
1-way ANOVA F = 0.083
P = 0.987
F = 1.502
P = 0.223
F = 0.823
P = 0.519
F = 0.691
P = 0.603
F = 1.2
P = 0.328
F = 1.140
P = 0.354
F = 0.412
P = 0.799
  1. Group F0: glass fiber post-core with 0.0 mm buccal and 2.0 mm lingual ferrule lengths, as control; Group CL/F1: glass fiber post-core with simulated crown lengthening and 1.0 mm buccal and 3.0 mm lingual ferrule lengths; Group CL/F2: glass fiber post-core with simulated crown lengthening and 2.0 mm buccal and 4.0 mm lingual ferrule lengths; Group OE/F1: glass fiber post-core with simulated orthodontic forced tooth eruption and 1.0 mm buccal and 3.0 mm lingual ferrule lengths; Group OE/F2: glass fiber post-core with simulated orthodontic forced tooth eruption and 2.0 mm buccal and 4.0 mm lingual ferrule lengths
  2. aMean (Standard Deviation); M-D: mesiodistal root width; B-L: buccolingual root width