Single Curve Torque Spring For Buccolingual Root Control

Product Introduction

The torque spring (also known as the door-shaped auxiliary bow or single-curve torque spring) is a  highly efficient device specifically designed for buccolingual root control of single teeth. It is a commonly used orthodontic auxiliary appliance that effectively controls tooth torque. The door-shaped torque spring is inserted into the slot hook of the bracket and secured with ligature wire to ensure stability. Compared to traditional main archwire-bent torque, it features a longer lever arm, greater torque, higher root control efficiency, and does not interfere with the other functions of the main archwire. The door-shaped torque spring comes in three sizes—large, medium, and small—with five models in total: 1622, 1725, 1825, 1925, and 2125. It is sold in bags of 10.

Structure

The overall shape is "door/horseshoe", consisting of a U-shaped curve bent from stainless steel wire and spiral retaining clips at both ends. The retaining clip can be directly clamped onto the main archwire, making installation very convenient.

Material

Medical grade 304 stainless steel wire is commonly used, which has good elasticity, fatigue resistance, is not easily deformed, and is resistant to oral corrosion.

Specifications

Divided into small (about 4mm), medium (about 6mm), and large (about 8mm) according to the height of the U-shaped curve, suitable for different tooth positions and bite spaces; There are also models differentiated by archwire size (16-22, 17-25, etc.) to meet different clinical needs.

working principle

It utilizes the principle of leverage mechanics to achieve precise root control:

1. The fixing clips at both ends serve as pivot points and are fixed on the main archwire;

2. The U-shaped curve in the middle serves as a force arm, supporting the gingival or maxillary direction of the target tooth bracket;

3. After applying force, the torque is transmitted through the force arm to drive the root of the teeth to move towards the target direction, effectively correcting the inclination of the teeth towards the cheek and tongue.

4. Compared to traditional main archwire bending torque, it has a longer force arm, greater torque, higher root control efficiency, and does not affect other functions of the main archwire.

Clinical Applicable Scenarios

1.  Maxillary incisors with palatal misalignment and excessive lip tilt require root control adjustment;

2. Maxillary canine protrusion on the labial side, requiring compression and control of root torque;

3. Excessive lip tilt or inward tilt of the front teeth requires individual adjustment of torque for each tooth;

4. When closing the gap in tooth extraction cases, prevent the anterior teeth from "fan-shaped spreading" and maintain the torque of the anterior teeth;

5.  Fine adjustment in the later stage of orthodontic treatment to solve the torque deviation of a single tooth.

Product advantages

1. Easy installation: No need for welding, directly clip in the main archwire, quick operation next to the chair, without taking up additional patient time.

2. Controllable force: The torque can be adjusted by adjusting the clamping angle of the retaining clip (parallel clamping force is greater, diagonal clamping force is smaller) to avoid excessive force damage to the tooth root.

3. Efficient and precise: specifically designed for single tooth root control, without affecting adjacent teeth, the correction efficiency is significantly improved compared to the main archwire torque.

4. Economic durability: Finished product design, reusable, low cost, high patient comfort.