Table 4 Friedman Test for the absolute value of the margin extension.

From: Clinical evaluation of tissue stops on 3D-printed custom trays

Jaw

Mean Rank

Test Statistics

3DPS

3DPM

3DPIM

N

Chi-Square

df

P

Upper

1.88

2.31

1.81

48

7.125

2

0.028 < 0.05

Lower

2.4

1.65

1.95

20

5.70

2

0.058 > 0.05

  1. 3DP: 3D-printed trays without tissue stop; 3DPS: 3D-printed trays with saddle-shaped tissue stops; 3DPM: 3D-printed trays with marginal-band tissue stops; 3DPIM: 3D-printed trays with inner marginal-band tissue stops.
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