The anchorage bend in the Begg technique

Area of Science:

• Orthodontics
• Biomaterials Engineering

Background:

• The Begg technique is a widely used orthodontic method.
• The anchorage bend is a critical component for controlling tooth movement within this technique.
• Understanding the mechanical properties of the anchorage bend is essential for effective treatment planning.

Purpose of the Study:

• To quantify the intrusive forces generated by the anchorage bend on anterior teeth.
• To investigate the frictional resistance to distal archwire movement caused by the anchorage bend.
• To evaluate the impact of different archwire types and configurations on these forces and resistances.

Main Methods:

• A custom test jig was designed and utilized to measure intrusive forces.
• Various archwires with different diameters and configurations were tested.
• The jig was modified to assess frictional resistance to distal archwire sliding.
• Experiments were conducted using standard and doubled-back archwires within an oval tube setup.

Main Results:

• Intrusive force was directly proportional to the degree of anchorage bend and archwire diameter.
• Frictional resistance generated by the anchorage bend exceeded commonly cited forces for distal sliding.
• Doubled-back archwires reduced intrusive forces but did not significantly alter frictional resistance.

Conclusions:

• The anchorage bend exerts considerable intrusive forces and frictional resistance, which are critical factors in Begg technique mechanics.
• Archwire diameter and bend degree are key determinants of intrusive force.
• The choice of archwire configuration, such as doubled-back wires, can modulate intrusive forces but not frictional resistance.