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Table 1 Means, standard deviation, and t test results of surface roughness measurements (nm = nano meters) for both groups

From: Bionic effects of nano hydroxyapatite dentifrice on demineralised surface of enamel post orthodontic debonding: in-vivo split mouth study

Variable Groups N Mean ± SD (nm) p value
Ra Group I 30 90.47 ± 6.58 < 0.001***
  Group II 30 28.53 ± 6.13  
Rq Group I 30 101.16 ± 8.30 < 0.001***
  Group II 30 27.56 ± 6.03  
Rz Group I 30 716.55 ± 70.16 < 0.001***
  Group II 30 278.25 ± 59.11  
  1. ***Statistically significant