• Tip-Edge Torque – A Torque Out of the Ordinary by Prof. Dr. Charles J. Bolender, Sarreguemines, France
    According to Strang, the danger of torque lies not in the force itself but in the ignorance of the one who uses it.

    Whichever orthodontic technique one chooses, the coronal inclination of the incisors, as described by Andrews, 1 is of major importance for an everlasting harmonious and stable occlusion. Any practitioner is therefore compelled to torque the incisors to achieve that axial orientation.

    However, the orthodontic forces necessary to achieve torque have often been considered too powerful to allow, at the very beginning of the procedure, the use of rectangular archwires filling entirely the bracket apertures. In the edgewise technique that stage generally starts with undersized wire that is progressively gaining power through an increase in cross section in order to reduce the clearance existing between the wire and the slot aperture. [read more]

  • Side-Winder Springs Need Elbow Room by Peter C. Kesling, D.D.S., Sc.D.
    More and more orthodontists are electing to finish their Differential Straight-Arch® cases utilizing Side-Winder springs in conjunction with passive, .0215″ x .028″ rectangular archwires.

    Side-Winder springs are now available in both the original and new invisible styles. Initially designed as an efficient power source for mesiodistal uprighting, their ability to also torque teeth has been demonstrated and popularized by Dr. R.C. Parkhouse of Wales.

    The second order power from the springs can be converted into third order forces to achieve labial or lingual root torque. [read more]