Korean J Orthod.  2009 Feb;39(1):43-53. 10.4041/kjod.2009.39.1.43.

Three dimensional analysis of tooth movement using different sizes of NiTi wire on NiTi scissors-bite corrector

• Jeon HJ
• Park SH
• Jung SH
• Chun YS

• KMID: 1469138
• DOI: http://doi.org/10.4041/kjod.2009.39.1.43

Abstract

OBJECTIVE
The purpose of this study was to compare the difference in three dimensional tooth movement using three different wire sizes (0.018 x 0.025-in, 0.016 x 0.022-in, 0.016-in) on a NiTi scissors-bite corrector.
METHODS
Computed tomography (CT) images of the experimental model before and after tooth movement were taken and reconstructed into three dimensional models for superimposition. The direction and the amount of tooth movement were measured and analyzed statistically.
RESULTS
The lingual and intrusive movements of the crown of the maxillary second molar were increased as the size of the NiTi wire increased. The roots of the maxillary second molars moved buccally except for the 0.016-in group. The intrusive movement of the roots of the maxillary second molars was increased as the size of the NiTi wire increased. Due to the use of orthodontic mini-implants, anchorage loss was under 0.2 mm on average.
CONCLUSIONS
The 0.018 x 0.025-in NiTi wire was most effective in lingual and intrusive movement of the maxillary second molar which was in scissors-bite position. Indirect skeletal anchorage with a single orthodontic mini-implant was rigid enough to prevent anchorage loss.

Keyword

Scissors-bite; NiTi scissors-bite corrector; Calorific machine; Indirect skeletal anchorage

MeSH Terms

Crowns
Models, Theoretical
Molar
Tooth
Tooth Movement

Figure

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  Fig 1 Basic structure of the Calorific machine system.

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  Fig 2 Dragon Helix and NiTi scissors-bite corrector. A, B, Dragon Helix; C, D, NiTi scissors-bite corrector. The second molar was aligned in line of occlusion and overintruded.

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  Fig 3 Bonding Procedure of NiTi Scissors-bite corrector. A, Buccal aspect; B, occlusal aspect.

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  Fig 4 Process of the experiments. A, Before tooth movement; B, after tooth movement; C, forming stl files from dicom files using V-works; D, superimposition and measuring of tooth movement.

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  Fig 5 Superimposition of experimental models (0.018 × 0.025 in). Blue color shows before tooth movement, and red color, after tooth movement. Red circle was one of the reference markers for superimposition, X axis is the bucco-lingual direction, Y axis is the occluso-gingival direction and Z axis is the mesio-distal direction. A, Buccal aspect; B, distal aspect.

• 

  Fig 6 Schematic drawing of superimposition. A, B, 0.018 × 0.025 in group; C, D, 0.016 × 0.022 in group; E, F, 0.016 in group A,C,E in occlusal view; B, D, F in distal view. Green teeth show initial position and purple teeth show final position.

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  Fig 7 Comparison of mesiolingual cusp displacements of the second molar between 3 groups. X axis, Bucco-lingual direction; Y axis, occluso-gingival direction. *, significantly different as p < 0.05 between groups.

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  Fig 8 Comparison of palatal root displacements of the second molar between 3 groups. *, significantly different as p < 0.05 between groups.

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