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American Journal of Orthodontics and Dentofacial Orthopedics, 2007-07-01, Volume 132, Issue 1, Pages 127-127, Copyright © 2007 American Association of Orthodontists

The purpose of this study was to investigate the frictional resistance of 2 new ceramic brackets, 2 self-ligating brackets, and 1 standard stainless steel bracket with several methods of ligation. The wires used were all stainless steel, and the sizes were .018, .019 × .025, and .021 × .025 in. The bracket and wire combinations were tested by pulling them superiorly both with and without variable tipping angles introduced to the wire. The bracket and wire combinations also had variable methods of ligation: stainless steel, alastic, and self-ligation. The data were then analyzed for the friction averages for each test. Wire size had the greatest impact above all other factors; as wire size increased, friction also increased. The alastic method of ligation had lower friction when compared with the stainless steel method of ligation. The Mystique ceramic bracket had higher friction compared with the Clarity. The self-ligating bracket SmartClip had lower friction than the Inovation R.