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Table 1 Bracket groups, mean values of friction, width, inter-bracket distance, and first- and second-order critical contact angles

From: Frictional resistance exerted by different lingual and labial brackets: an in vitro study

Group ID code Bracket Mean friction Width L Θ cI Θ cII
Lower lingual A1 In-Ovation L 4.73 2.18 2.73 8.19 4.21
A2 7th Generation 3.19 1.77 3.11 10.13 5.31
A3 New STb 1.1 2.53/1.50 2.43/3.42 12.13 3.71
A4 O.R.J. 1.79 2.28 2.72 7.80 3.91
A5 OldSTb 2.32 2.04 2.82 8.77 4.50
Lower labial A6 Forestadent 3.17 2.57 5.13 6.92 3.77
A7 Ormco Mini Diamond 2.65 2.68 4.46 6.63 3.60
A8 G&H Ceramic 4.64 2.83 4.35 6.26 3.41
Upper lingual B1 7th Generation 4 2.36 3.48 7.56 3.91
B2 O.R.J. 2.43 2.81 3.56 6.32 3.34
B3 OldSTb 2.1 2.53 3.84 7.03 3.71
B4 New STb 1.79 2.56/1.51 3.89/4.58 12.04 3.68
B5 In-Ovation L 2.6 2.17 3.82 8.21 4.22
Upper labial B6 Forestadent 3.27 3.55 6.30 4.99 2.68
B7 Ormco Mini Diamond 2.62 3.49 6.07 5.08 2.71
B8 G&H Ceramic 4.38 3.48 6.04 5.08 2.69
  1. There were two different bracket widths for the New STb (Figure 2).