The inclination of maxillary and mandibular anterior teeth impacts not only smile aesthetics but also the shape of the lips, making appropriate control essential. In orthodontic treatment, failure to control the torque of anterior teeth is mainly due to inadequate crown labial torque. This inadequacy increases vertical overlap and creates bracket interference, delaying treatment.

The moment applied to control the inclination of anterior teeth is primarily generated by the torsion between rectangular archwires and edgewise bracket systems. When a twisted archwire is inserted into the bracket, it creates a couple between the two wings. Due to the short distance between these two forces, a very large force is required to generate the desired amount of moment. This large force can cause pain during wire insertion and may result in bracket breakage. Such strong forces contrast with the modern orthodontic philosophy that considers light continuous force to be ideal.

Furthermore, the moment generated between the archwire and the bracket does not couple with the traction force of the dentition, making it difficult to maintain a consistent M/F ratio. This inconsistency results in unnecessary jiggling during the treatment process.

This presentation proposes a new force system that reduces reliance on brackets for controlling the inclination of anterior teeth.