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PEARLS

Dead-Soft Security Archwires

In a nonextraction case, an archwire is usually placed to initiate tooth movement immediately after bonding. The stainless steel or elastomeric ligatures prevent any debonded attachments or loose bands from being swallowed or aspirated.

In an extraction case, however, inserting stainless steel or nickel titanium archwires might create undesired tooth movement before the extractions are performed. This problem can be avoided by placing sectional arches made of dead-soft brass wire or twisted, double strands of .008" or .010" dead-soft stainless steel ligature wires. These arches are bent to lie passively in all attachments and tubes anterior and posterior to the extraction sites (Fig. A).

The same types of sectional wires can be used as final archwires in one or both arches, in conjunction with "snake" elastics, to enhance intercuspation prior to appliance removal (Fig. B).

  • ROBERT E.
    DR. BINDER
  • ALLISON
    DR. SCOTT

Dr. Binder is Professor of Orthodontics and Dr. Scott is Postgraduate Orthodontic Student, New  Jersey Dental School, University of Medicine & Dentistry of New Jersey, 110 Bergen St., Newark, NJ 07103.

Fig. 1 A. Simultaneous intrusion and retraction on .019"x .025" stainless steel archwire, with anchorage from mini-implants placed in infrazygomatic crest of maxilla between second premolars and first molars. B. Overbite significantly improved at end of space-closure phase.
Fig. 2 A. Physical volume of extracted tooth measured using water-displacement technique. B. Irregularities created with carbide bur on extracted upper right central incisor, lateral incisor, and canine to mimic root-resorption defects.
Fig. 3 Cone-beam computed tomography images of anterior teeth before treatment (A) and after space closure (B).
Fig. 4 A. Segmentation of six anterior teeth using Mimics software. B. Segmentation of crown and root on plane passing through cementoenamel junction. C. Root imported into 3-matic software module. D. Center of gravity identified and root oriented in two planes. E. Roots segmented into four parts before treatment and after space closure and superimposed on orientation planes. F. Volume of each section calculated and compared. (Images reproduced by permission of International Journal of Engineering Research and Development, India; www.ijerd.com.)

DR. SHREYA AJMERA BDS

DR. SHREYA  AJMERA BDS

DR. SHIVANAND VENKATESH BDS, MDS, MOrth RCS

DR. SHIVANAND  VENKATESH BDS, MDS, MOrth RCS

DR. SANJAY V. GANESHKAR BDS, MDS, MDO RCPS

DR. SANJAY V.  GANESHKAR BDS, MDS, MDO RCPS

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