Table 2 Displacement of molar using T loop, Cherry loop and open helical loop in Y axis (anteroposterior) and Z axis (vertical).

From: Finite element study of the efficacy of three different loops for bodily protraction of the mandibular molar

 

MBC (mm)

DBC (mm)

MR (mm)

DR (mm)

Y axis

Z axis

Y axis

Z axis

Y axis

Z axis

Y axis

Z axis

T loop

 10°

− 1.728

− 0.11

− 1.68

0.473

0.102

0.231

0.072

0.537

 15°

− 1.546

− 0.095

− 1.506

0.191

− 0.711

0

− 0.749

0.108

 20°

− 1.337

− 0.077

− 1.322

− 0.069

− 1.428

− 0.144

− 1.475

− 0.205

Cherry loop

 10°

− 1.766

− 0.069

− 1.72

0.522

0.096

0.281

0.071

0.598

 15°

− 1.568

− 0.061

− 1.529

0.245

− 0.651

0.054

− 0.679

0.185

 20°

− 1.365

− 0.068

− 1.348

− 0.048

− 1.411

− 0.126

− 1.456

− 0.175

Open Helical loop

 10°

− 1.773

− 0.09

− 1.725

0.493

0.054

0.249

0.024

0.55

 15°

− 1.573

− 0.094

− 1.533

0.199

− 0.711

0.007

− 0.746

0.124

 20°

− 1.353

− 0.103

− 1.337

− 0.102

− 1.459

− 0.166

− 1.506

− 0.224

  1. MBC Mesio-buccal crown, DBC Disto-buccal crown, MR mesial root, DR distal root.