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- Title
A comparative study of frictional force in self-ligating brackets according to the bracket-archwire angulation, bracket material, and wire type.
- Authors
Souk Min Lee; Chung-Ju Hwang
- Abstract
Objective: This study aimed to compare the frictional force (FR) in self-ligating brackets among different bracket-arch wire angles, bracket materials, and archwire types. Methods: Passive and active metal self-ligating brackets and active ceramic self-ligating brackets were included as experimental groups, while conventional twin metal brackets served as a control group. All brackets were maxillary premolar brackets with 0.022 inch [in] slots and a -7° torque. The orthodontic wires used included 0.018 round and 0.019 x 0.025 in rectangular stainless steel wires. The FR was measured at 0°, 5°, and 10° angulations as the wire was drawn through the bracket slots after attaching brackets from each group to the universal testing machine. Static and kinetic FRs were also measured. Results: The passive selfligating brackets generated a lower FR than all the other brackets. Static and kinetic FRs generally increased with an increase in the bracket-arch wire angulation, and the rectangular wire caused significantly higher static and kinetic FRs than the round wire (p < 0.001). The metal passive self-ligating brackets exhibited the lowest static FR at the 0° angulation and a lower increase in static and kinetic FRs with an increase in bracket-arch wire angulation than the other brackets, while the conventional twin brackets showed a greater increase than all three experimental brackets. Conclusions: The passive self-ligating brackets showed the lowest FR in tliis study. Self-ligating brackets can generate varying FRs in vitro according to the wire size, surface characteristics, and bracket-archwire angulation.
- Subjects
FRICTION; ORTHODONTIC appliances; ORTHODONTICS; STAINLESS steel; CORRECTIVE orthodontics
- Publication
Korean Journal of Orthodontics, 2015, Vol 45, Issue 1, p13
- ISSN
2234-7518
- Publication type
Article
- DOI
10.4041/kjod.2015.45.1.13