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2013 Oct-Dec; Vol 4, No 4:e3 |
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Frictional Resistance of Three Types of Ceramic Brackets J Oral Maxillofac Res 2013 (Oct-Dec);4(4):e3 doi:10.5037/jomr.2013.4403 |
Frictional Resistance of Three Types of Ceramic Brackets
1Specialist Practice, Buxton, United Kingdom.
2Department of Orthodontics, University of Aberdeen, Aberdeen, United Kingdom.Corresponding author:
The University of Aberdeen Dental School and Hospital
Cornhill Road, Foresterhill, AB25 2ZR, Aberdeen
United Kingdom
Phone: +44 1224 555151
E-mail: k.khalaf@abdn.ac.uk
ABSTRACT
Objectives: To investigate the static frictional resistance at the bracket/archwire interface in two recently introduced bracket systems and compare them to conventional ceramic and conventional metal bracket systems. Three variables were considered including the bracket system, archwire type and archwire angulation.
Material and Methods: Four bracket systems were tested in vitro: Self ligating ceramic, ceramic with metal slot and module, conventional ceramic with module and conventional metal with module. A specially constructed jig and an Instron testing machine were used to measure the static frictional resistance for 0.014 inches round and 0.018 x 0.025 inches rectangular stainless steel wires at 0° and 7° angulations. Main outcome measures: static frictional force at the bracket/archwire interface; recorded and measured in units of force (Newtons).Results: Self ligating ceramic and metal slot ceramic bracket systems generated significantly less static frictional resistance than conventional ceramic bracket systems with the wire at both angulations (P < 0.05). Changing the wire from 0.014 round to 0.018 x 0.025 rectangular wire significantly increased frictional forces for metal slot ceramic and conventional metal bracket systems (P < 0.01). Increasing wire angulation significantly increased frictional resistance at the bracket/archwire interface for all four types of bracket systems tested (P < 0.001).
Conclusions: Compared to conventional ceramic, self ligating ceramic and metal slot ceramic bracket systems should give improved clinical performance, matching that of conventional metal brackets.
J Oral Maxillofac Res 2013 (Oct-Dec);4(4):e3
doi:10.5037/jomr.2013.4403
Accepted for publication: 27 December 2013
Keywords: friction; ceramics; orthodontic brackets; corrective orthodontics; orthodontic wires.
To cite this article: Frictional Resistance of Three Types of Ceramic Brackets. J Oral Maxillofac Res 2013;4(4):e3 URL: http://www.ejomr.org/JOMR/archives/2013/4/e3/v4n4e3ht.htm |
Received: 29 August 2013 | Accepted: 27 December 2013 | Published: 1 January 2014
Copyright: © The Author(s). Published by JOMR under CC BY-NC-ND 3.0 licence, 2014.