Korean J Orthod.  2017 Jul;47(4):268-274. 10.4041/kjod.2017.47.4.268.

Maxillary molar derotation and distalization by using a nickel-titanium wire fabricated on a setup model

• Jung JM
• Wi YJ
• Koo HM
• Kim MJ
• Chun YS

• KMID: 2379559
• DOI: http://doi.org/10.4041/kjod.2017.47.4.268

Abstract

The purpose of this article is to introduce a simple appliance that uses a setup model and a nickel-titanium (Ni-Ti) wire for correcting the mesial rotation and drift of the permanent maxillary first molar. The technique involves bonding a Ni-Ti wire to the proper position of the target tooth on a setup model, followed by the fabrication of the transfer cap for indirect bonding and its transfer to the patient's teeth. This appliance causes less discomfort and provides better oral hygiene for the patients than do conventional appliances such as the bracket, pendulum, and distal jet. The treatment time is also shorter with the new appliance than with full-fixed appliances. Moreover, the applicability of the new appliance can be expanded to many cases by using screws or splinting with adjacent teeth to improve anchorage.

Keyword

Molar derotation; Appliance; Bracket; Tooth movement

MeSH Terms

Humans
Molar*
Oral Hygiene
Splints
Tooth
Tooth Movement

Figure

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  Figure 1 A, Initial model; B, ideal setup model.

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  Figure 2 Fabrication of the nickel-titanium (Ni-Ti) spring with a customized resin base. Both ends of the Ni-Ti wire have been bent to prevent unwanted rotation in the resin base.

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  Figure 3 Fabrication of the transferring resin jig for the nickel-titanium spring with a customized resin base.

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  Figure 4 Precise application of the nickel-titanium spring with a customized resin base by transferring the resin jig.

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  Figure 5 Adequate space is gained through the derotation of the maxillary first premolar and maxillary first molar. A, Pretreatment; B, after 6 weeks; C, after 4 months; D, post-treatment (after 5 months); E, 18 months after treatment. The occlusal button seen in C is bonded for later use during orthodontic traction. However, traction was not applied because the tooth erupted spontaneously.

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  Figure 6 Comparison of the radiographs at A, pretreatment; B, post-treatment; and C, 18 months after treatment.

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  Figure 7 Three-dimensional superimposition of the pre-treatment (blue) and post-treatment (red) models. The models were scanned using the intraoral scanner (iTero™; Align Technology Inc., Santa Clara, CA, USA), and the models were superimposed using a three-dimensional reverse modeling software (Rapidform 2002; INUS Technology, Seoul, Korea). A, Occlusal view of the maxillary dentition; B, occlusal view of the left maxillary dentition; C, palatal view of the left maxillary dentition; D, buccal view of the left maxillary dentition.

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  Figure 8 Three-dimensional superimposition of the setup model (blue) and post-treatment (red) model. The maxillary left first molar is more distally tipped in the post-treatment model than in the setup model. A, Occlusal view of the superimposition; B, buccal view of the superimposition.

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