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Table 1 Volumes and surface areas of real and 3D-printed canals pre- and post-preparation (n = 12)

From: Shaping ability of protaper next compared with waveone in late-model three-dimensional printed teeth

Group Volume before preparation (mm3) Volume after preparation (mm3) Surface area before preparation (mm2) Surface area after preparation (mm2)
Mean ± SD Mean ± SD Mean ± SD Mean ± SD
Real teeth 2.82 ± .74 2.94 ± .75 19.61 ± 3.65 20.51 ± 3.58
3D-printed teeth 2.78 ± .73 2.97 ± .77 19.57 ± 3.60 20.59 ± 3.24
P value .289b .064a .387b .494a
  1. aPaired-samples T test (P < .05)
  2. bWilcoxon signed-rank test (P < .05)