| 3315 Frictional Properties of Titanium and Stainless Steel Orthodontic Brackets | ||
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J. PARAJON1, V. DHURU1, F.J. VILLALOBOS2, T.G. BRADLEY1, and E.M. NADELHOFFER1, 1Marquette University, Milwaukee, WI, USA, 2Marquette University, School of Dentistry, Milwaukee, WI, USA The differences between the frictional properties of stainless steel and titanium brackets, introduced because of the concern for the possible hypersensitivity from nickel in stainless steel brackets, are not significant. A recently introduced slot design of a stainless steel bracket has demonstrated reduced friction. Objectives: the study was designed, to compare friction of arch wires in titanium and reduced friction stainless steel brackets simulating clinical conditions. Methods: The study included three bracket types: a pure titanium [TI] (Orthos2 Titanium, Ormco), a reduced friction stainless steel [RF] (Synergy, RMO), a standard stainless steel [ST] (MBT, 3M Unitek) used as a control, and three sizes of stainless steel arch wires: [L] 0.019” x 0.025”, [M] 0.017” x 0.025”, [S] 0.016” x 0.022”) [Ormco, Glendora, CA]. A specially designed fixture mounted on an Instron universal testing machine was used to measure the mean static and kinetic frictional forces in nine different bracket/arch wire combinations. The data were evaluated using a two-way analysis of variation (ANOVA) and Tukey ad hoc multiple comparison test. Results: The mean static frictional force values were significantly lower than the mean kinetic frictional force values within each bracket/arch wire combination with the TI brackets showing the highest values [p<0.05]. For kinetic friction, the ST brackets showed greater mean friction in terms of gram force (gf) for the larger wires, L (110+24) and M (92+19) than the S wires (80+17) [p>0.05]. For the S wires, the TI brackets showed greater mean fraction (97+15) than the ST (80+17) brackets [p>0.05]. The RF brackets yielded significantly lower friction values for all the three wire sizes than the other two brackets [p<0.001].Conclusions: The findings suggest that if hypersensitivity is of no concern, the reduced friction stainless steel brackets would be more efficient for the orthodontic treatment involving sliding mechanics. | ||
| Seq #349 - Endodontic, Orthodontic, Implant Materials - Properties 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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Back to the Dental Materials: VIII - Others-Non-metallic Program
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