Korean J Orthod.  2016 Mar;46(2):73-80. 10.4041/kjod.2016.46.2.73.

Effect of passive self-ligating bracket placement on the posterior teeth on reduction of frictional force in sliding mechanics

• Kim KR
• Baek SH

• KMID: 2159354
• DOI: http://doi.org/10.4041/kjod.2016.46.2.73

Abstract

OBJECTIVE
The purpose of this study was to investigate the static (SFF) and kinetic frictional forces (KFF) in sliding mechanics of hybrid bracket systems that involve placing a conventional bracket (CB) or active self-ligating bracket (ASLB) on the maxillary anterior teeth (MXAT) and a passive SLB (PSLB) on the maxillary posterior teeth (MXPT).
METHODS
The samples consisted of two thoroughbred types (group 1, anterior-CB + posterior-CB; group 2, anterior-ASLB + posterior-ASLB) and four hybrid types (group 3, anterior-CB + posterior-PSLB-type 1; group 4, anterior-CB + posterior-PSLB-type 2; group 5, anterior-ASLB + posterior-PSLB-type 1; group 6, anterior-ASLB + posterior-PSLB-type 2) (n = 13 per group). After maxillary dentition alignment and maxillary first premolars removal in the stereolithographically-made typodont system, a 0.019 × 0.025-inch stainless steel wire was drawn through the right quadrant of the maxillary arch at 0.5 mm/min for 5 min. The SFF and KFF were measured with a mechanical testing machine and statistical analyses were performed.
RESULTS
Four different categories of SFF and KFF were observed among all groups (all p < 0.001). Group 1 demonstrated the highest SFF and KFF; groups 4 and 3 were second and third highest, respectively. The fourth category included groups 2, 5, and 6. Placing PSLBs on the MXPT resulted in significant SFF and KFF reductions in cases with CBs on the MXAT, but not in cases with ASLBs on the MXAT.
CONCLUSIONS
These data might aid in the development of a hybrid bracket system that enables low-friction sliding of an archwire through the MXPT.

Keyword

Frictional force; Hybrid bracket system; Sliding mechanics; Self-ligating brackets

MeSH Terms

Bicuspid
Dentition
Friction*
Mechanics*
Stainless Steel
Tooth*
Stainless Steel

Figure

• 

  Figure 1 The stereolithographically-made typodont system. A, The maxillary teeth were aligned to their ideal positions according to a Broad Arch Form (Ormco). For the evaluation of frictional force in sliding mechanics during extraction space closure, the maxillary first premolar was removed from the typodont. B, The stereolithographically-made typodont system and testing apparatus.

• 

  Figure 2 Comparisons of frictional force (cN) between groups 1, 3, and 4 and between groups 2, 5, and 6. A, Static frictional force; B, kinetic frictional force. A one-way analysis of variance (ANOVA) was performed and the results were verified with Duncan's multiple comparison test.*p < 0.01, †p < 0.001.

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