Right Left
Mean (SD) P Mean (SD) P
D1 (n = 300) 15.65 (3.54) 0.000a 15.73 (3.59) 0.000a
D2 (n = 300) 8.95 (1.68) 8.96 (1.68)
D3 (n = 300) 4,09 (1.33) 0.000a 4.11 (1.37) 0.000a
D4 (n = 300) 2.37 (0.8) 2.33 (0.78)

aSignificant, paired samples t-test (significance level P < 0.05).
D1 = upper distance; D2 = lower distance; D3 = buccal distance; D4 = lingual distance; n = number of cases; SD = standard deviation.