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 Table of Contents  
Year : 2017  |  Volume : 7  |  Issue : 5  |  Page : 248-249

W spring for management of impacted teeth

1 Department of Orthodontics, Government Dental College and Hospital, Nagpur, India
2 Department of Orthodontics and Dentofacial Orthopedics, CSMSS Dental College, Aurangabad, Maharashtra, India

Date of Web Publication14-Sep-2017

Correspondence Address:
Umal Hiralal Doshi
UPHAR, 68, Builders Society, Aurangabad, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2321-1407.214569

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Forced eruption of an impacted tooth necessitates a firm and versatile attachment for force application. The present article describes a simple modification of NiTi closed coil spring called W spring for predictable forced eruption of impacted teeth.

Keywords: Impacted, teeth, W spring

How to cite this article:
Minase RA, Bhad WA, Doshi UH. W spring for management of impacted teeth. APOS Trends Orthod 2017;7:248-9

How to cite this URL:
Minase RA, Bhad WA, Doshi UH. W spring for management of impacted teeth. APOS Trends Orthod [serial online] 2017 [cited 2018 Apr 23];7:248-9. Available from: http://www.apospublications.com/text.asp?2017/7/5/248/214569

  Introduction Top

Management of impacted teeth is challenging for any orthodontist. Over the years, various techniques in the form of elastics and springs have been proposed.[1],[2],[3],[4],[5],[6],[7] Force application with elastics is short acting, hence requires frequent replacement. With elastics, hygiene is also an issue. Although springs can produce predictable, continuous forces its presence is more often than not uncomfortable to patients. Another problem with springs is its unidirectional force vector, which needs frequent modifications. To overcome these problems, Schubert [8] had proposed Easy Way Coil system that used closed stainless steel spring attached to bondable buttons using steel ligature. This system is quite effective, but the use of stainless steel spring necessitates frequent removal and shortening of spring. Moreover, force is not continuous. To overcome this problem, we have developed a simple modification using a NiTi closed coil spring and mesh base, called W spring (named after initial of the second author).

  Appliance Fabrication Top

  1. Separate the mesh base of bondable Begg's molar tube with plier [Figure 1]a and [Figure 1]b. Or alternatively readymade mesh base can also be used
  2. Cut the base in desired shape
  3. Select NiTi coil spring of required length depending on force required
  4. In 20-gauge stainless steel wire prepare a loop and pass eyelet of NiTi closed coil spring in the loop [Figure 1]c
  5. Weld both the end of loop to base [Figure 1]d. With this design force vector can be modified since the spring is freely movable in stainless steel loop
  6. If only a single direction is required, then eyelet of closed coil spring can be directly welded to mesh base [Figure 1]e.
Figure 1: (a) Begg bondable tube. (b) Mesh base. (c) NiTi closed coil spring with steel loop. (d) Spring with welded loop. (e) Spring with eyelet welding

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  Advantages Top

  1. Continuous and predictable force can be applied
  2. Hygienic and comfortable to patients
  3. Can be used in variety of clinical situations, for example, impacted canines, incisors, and with some modifications for forced eruption of posterior teeth [Figure 2]a, [Figure 2]b and [Figure 3]a, [Figure 3]b
  4. Force vector can be modified
  5. Use of mesh instead of bondable button allows application of assembly to any tooth surface with close adaptation
  6. No need of frequent reactivations. If required coil can be cut and shortened and secured to main wire with steel ligature
  7. Implant-supported forced eruption is also possible since eyelets can be easily secured to implants.
Figure 2: (a) Modified spring for vertical eruption of canine. (b) Progress

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Figure 3: (a) Modified spring with eyelet soldered to mesh for distal uprighting of impacted canine. (b) After canine uprighting

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Financial support and sponsorship


Conflicts of interest

There are no conflicts of interest.

  References Top

Pearson MH, Robinson SN, Reed R, Birnie DJ, Zaki GA. Management of palatally impacted canines: The findings of a collaborative study. Eur J Orthod 1997;19:511-5.  Back to cited text no. 1
Jacoby H. The 'ballista spring” system for impacted teeth. Am J Orthod 1979;75:143-51.  Back to cited text no. 2
Kornhauser S, Abed Y, Harari D, Becker A. The resolution of palatally impacted canines using palatal-occlusal force from a buccal auxiliary. Am J Orthod Dentofacial Orthop 1996;110:528-34.  Back to cited text no. 3
Kalra V. The K-9 spring for alignment of impacted canines. J Clin Orthod 2000;34:606-10.  Back to cited text no. 4
Fischer TJ, Ziegler F, Lundberg C. Cantilever mechanics for treatment of impacted canines. J Clin Orthod 2000;34:647-50.  Back to cited text no. 5
Sinha PK, Nanda RS. Management of impacted maxillary canines using mandibular anchorage. Am J Orthod Dentofacial Orthop 1999;115:254-7.  Back to cited text no. 6
Park HS, Kwon OW, Sung JH. Micro-implant anchorage for forced eruption of impacted canines. J Clin Orthod 2004;38:297-302.  Back to cited text no. 7
Schubert M. A new technique for forced eruption of impacted teeth. J Clin Orthod 2008;42:175-9.  Back to cited text no. 8


  [Figure 1], [Figure 2], [Figure 3]


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