The Broussard two force technique is based upon the philosophy that one passive force-the main archwire-will establish and maintain harmony, symmetry, and arch coodination, while the removable auxiliary springs will provide the second, active force. These auxiliary springs, under the guidance and control of the main archwire, are used to move a tooth, a group of teeth, thereby producing many individual tooth movements.
Suummary of theBroussard principle is as follows.
1. Edgewise control is possible at all times, and can be used to the degree needed, because a main archwire is always used.
2. With the aid of the vertical slot principle, auxiliary springs which work independent of the main archwire may be employed, to exert forces on tooth, or a group of teeth.
3. The activating force to move the teeth is not incoporated in the main archwire (in contrast with most of the light wire techniques) but it i-I provided by the auxiliary attachments.
4. These auxiliary springs then work under the guidance of the main arch wire, to produce definite and controlled tooth movements.
5. Thus, one tooth, or a group of teeth, may be selectively treated, without major archwire changes for each procedure.
6. In this manner, the main archire remains remains relatively undistorted and ideal in shape,
7. The main archwire is used to establish harmony, symmetry, and arch coordination, while these auxiliary forces are being exerted.
8. This represents the two force system. The headgear would represent the third force.
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