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Table 2 Smear layer removal data from topical and friction applications

From: Erosive potential of energy drinks on the dentine surface

Group Application method Median (range; lower quartile, upper quartile) #
Control (Distilled water) Topical 4.0 (4–4; 4, 4) ns
Friction 4.0 (4–4; 4, 4)
RedBull Topical 3.0 (2–3; 2, 3) ns
Friction 3.0 (1–3; 1.5, 3)
Flying Horse Topical 2.0 (2–3; 2, 3) ns
  Friction 2.0 (2–3; 2, 2.5)  
Bug Topical 2.0 (1–3; 1, 3) ns
  Friction 3.0 (2–3; 2.5, 3)  
Burn Topical 3.0 (2–3; 2, 3) ns
  Friction 2.0 (2–2; 2, 2.5)  
Gladiator Topical 3.0 (2–3; 2, 3.5) ns
  Friction 2.0 (2–3; 2, 2.5)  
Hot Power Topical 3.0 (2–4; 2.5, 3.5) ns
  Friction 3.0 (2–3; 2, 3)  
Flash Power Topical 3.0 (3–3; 3, 3) ns
  Friction 3.0 (3–4; 3, 3.5)  
Army Power Topical 4.0 (3–4; 3, 4) p = 0.04
  Friction 3.0 (2–3; 2, 3)  
Ionic Topical 3.0 (2–4; 2.5, 3.5) ns
  Friction 3.0 (2–3; 2.5, 3)  
TNT Topical 3.0 (1–4; 1.5, 4) ns
  Friction 3.0 (2–4; 2.5, 4)  
Sports Drink Topical 3.0 (3–3; 3, 3) ns
  Friction 2.0 (1–2, 1, 2)  
  1. Mann–Whitney test (p = 0.05).
  2. ns = not significant (p > 0.05).