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. 2013 Jun 25;4(2):204-11.
eCollection 2013.

The dynforce archwire

Daniele Cantarella  1 , Luca Lombardo, Giuseppe Siciliani
Affiliations

The dynforce archwire

Daniele Cantarella et al. Ann Stomatol (Roma). .

Abstract

This article is a presentation of a clinical methodology aimed at minimizing binding in fixed orthodontic appliances. The dynforce archwire is explained. The dynforce archwire has a full size anterior segment (e.g. .021×.025) and undersized posterior segments with rectangular cross-section (e.g. .018×.025 or .018×.022), and is used in the orthodontic phase of space closure with or without TAD miniscrews. Two clinical cases are presented.

Keywords: TAD; archwire; binding; ceramic brackets; friction; incisor; miniscrew; retraction; skeletal anchorage; sliding; torque.

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Figures

Figure 1
Figure 1
Deflection (d) of a beam of orthodontic wire of length L, redrawn from Proffit and Fields (1).
Figure 2
Figure 2
Load-deflection diagram.
Figure 3
Figure 3
Resistance to sliding in orthodontic fixed appliances is the sum of Classical Friction, Binding, Permanent Deformation (notching).
Figure 4
Figure 4
Tooth movement in sliding mechanics is a multistep tipping-uprighting mechanism.
Figure 5
Figure 5
Start of alignment of a highly positioned canine.
Figure 6
Figure 6
In the presence of high resistance to sliding, opening of spaces and buccal flaring of incisors may occur during the alignment phase.
Figure 7
Figure 7
In the presence of low resistance to sliding, alignment is performed without opening of spaces and without buccal flaring of incisors. The archwire comes out distally to the molar bracket.
Figures 8 and 9
Figures 8 and 9
Frontal and lateral view of start of alignment of a patient with highly positioned canine. Use of .012 nichel-titanium archwire.
Figures 10 and 11
Figures 10 and 11
Frontal and lateral view of the patient after 40 days. Alignment of teeth occurred without opening of spaces and without buccal flaring of incisors. Low forces generate low binding. Also, low forces are more easily contrasted by the pressure of the lips (lip bumper effect).
Figure 12
Figure 12
Dynforce Archwire
Figure 13
Figure 13
Dynforce Archwire with miniscrews placed 7–8 mm above the archwire.
Figure 14
Figure 14
Start of en-masse retraction performed with the Dynforce archwire and miniscrews.
Figure 15
Figure 15
After Canine Class I is achieved, retraction is continued with the Dynforce archwire with reciprocal anchorage.
Figure 16
Figure 16
Extraction space completely closed.
See this image and copyright information in PMC

References

    1. Proffit WR, Fields HW. Contemporary Orthodontics. Second ed. Mosby; 1993. pp. 289–302.
    1. Philips RW. Skinner’s Science of Dental Materials. W.B. Saunders Company; 1991. pp. 18–19.pp. 537–551.
    1. Kalpakijan S, Schmid SR. In: Tecnologia meccanica. Pearson, editor. 2008.
    1. Kusy RP. Ongoing Innovations in biomechanics and materials for the new millennium. Angle Orthodontist. 2000;70(5) - PubMed
    1. Thorstenson GA, Kusy RP. Effect of archwire size and material on the resistance to sliding of self-ligating brackets with second- order angulation in the dry state. Am J Orthod Dentofacial Orthop. 2002;122:295–305. - PubMed

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