YOGOSAWA, F. Predicting soft tissue profile changes concurrent with orthodontic treatment. Angle orthod. 1990, 60, 199-206
TA N, T. J. Profile changes following orthodontic correction of bimaxillary protrusion with a preadjusted edgewise appliance. Int. J. Adult Orthodon. Orthognath. Surg. 1996, 11, 239-251