Korean J Orthod.  2012 Aug;42(4):218-224. 10.4041/kjod.2012.42.4.218.

In vitro evaluation of resistance to sliding in self-ligating and conventional bracket systems during dental alignment

• Cordasco G
• Lo Giudice A
• Militi A
• Nucera R
• Triolo G
• Matarese G

• KMID: 1435416
• DOI: http://doi.org/10.4041/kjod.2012.42.4.218

Abstract

OBJECTIVE
To investigate the resistance to sliding (RS) in self-ligating and conventional ligation bracket systems at 5 different second-order bracket angulations by using low-stiffness alignment wires in a 3-bracket experimental model and to verify the performance of the main RS components in both systems when these wires are used.
METHODS
Interactive self-ligating brackets with closed and open slides were used for the self-ligating (SL) and conventional ligation (CL) groups, respectively; elastomeric ligatures (1 mm inner diameter) were used in the latter system. The alignment wire used was 0.014 inch heat-activated NiTi (austenitic finish temperature set at 36degrees C by the manufacturer). A custom-made testing machine was used to measure frictional resistance. Tests were repeated 5 times at every angulation simulated. All data were analyzed statistically.
RESULTS
The RS increased significantly with increasing angulation in both SL and CL groups (p < 0.0001). However, the RS values were significantly higher at every angulation (p < 0.0001) in the CL group.
CONCLUSIONS
Despite the relevance of the binding phenomenon, ligation forces predominantly affect the RS when low-stiffness alignment wires are used.

Keyword

Bracket; Wire

MeSH Terms

Elastomers
Friction
Ligation
Models, Theoretical
Polymers
Elastomers
Polymers

Figure

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  Figure 1 Experimental model showing brackets (BR), direction of bracket angulations, direction of sliding of the wire, interbracket distance (IBD), 0.014-inch NiTi archwire (AW), wire deflection (WD), and binding angle (θc).

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  Figure 2 Frontal view of the experimental model. A, Stainless steel apparatus; B, C, D, first premolar, canine, lateral incisor bracket.

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  Figure 3 Frontal view of the mounting apparatus. A, Mounting apparatus; B, single bracket-brass mount couple; C, stainless steel jig (0.016 × 0.022-inch).

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  Figure 4 Stainless steel jig (16 × 22) engaged within all brackets. A, Mounting apparatus; B, C, D, first premolar, canine, lateral incisor bracket; E, 16 × 22 stainless steel jig.

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  Figure 5 Lateral view of the testing machine. A, Static carriage; B, moving carriage; C, vertical rod; D, protractor; E, 3-bracket apparatus; F, wire.

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  Figure 6 Thermostat.

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