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Table 1 Results of paired t -test of the null hypothesis and standard deviations for measurements on both types of models

From: Possibility of reconstruction of dental plaster cast from 3D digital study models

   Axis Mean [mm] 95% confidence interval P value Std [mm] 95% confidence interval
PM for 3-3 x 0.23 −0.24 0.69 0.30 0.46 0.32 0.84
  for 3-6 y 0.05 −0.09 0.19 0.46 0.14 0.10 0.26
  for 3 z 0.05 −0.04 0.13 0.28 0.09 0.06 0.16
  for 3-1 mixed −0.01 −0.11 0.08 0.75 0.09 0.06 0.17
RR for 3-3 x 0.12 −0.24 0.49 0.47 0.36 0.25 0.66
  for 3-6 y 0.04 −0.04 0.12 0.33 0.08 0.06 0.15
  for 3 z 0.11 −0.03 0.25 0.10 0.14 0.09 0.25
  for 3-1 mixed 0.05 −0.08 0.18 0.42 0.13 0.09 0.24
  1. This table shows the results of the paired t-test. 3–3 means intercanine distance, x-plane, 3–6 means y-plane, 3 means the clinical hight of crown of canine, 3–1 states for mixed plane. The null hypothesis states that there are no differences between the measurements on the plaster models (PM) and RepRap 3D printed copies (RR). And the samples were randomly selected from a normal distribution with mean 0 and unknown variance. The alternative hypothesis is that that the mean is not 0. In the second part of the table, the values of standard deviation for the measurements on the plaster models and RepRap 3D printed copies are depicted.