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Year : 2015  |  Volume : 4  |  Issue : 2  |  Page : 42-46

In vitro evaluation of frictional forces of two ceramic orthodontic brackets versus a stainless steel bracket in combination with two types of archwires

1 Dental Material Research Center, School of Dentistry, Babol University of Medical Sciences, Babol, Iran
2 Department of Mechanics, Babol University of Noushirvani, Babol, Iran
3 Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences; Department of Dental Anatomy and Morphology, Islamic Azad University, Tehran, Iran
4 Department of Orthodontics, School of Dentistry, Mazandaran University of Medical Sciences, Sari, Iran

Correspondence Address:
Dr. Farhad Sobouti
Orthodontic Clinic, Touba Medical Center, Khazar Square, Sari
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2278-0203.156028

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Purpose: The aim of this study was to compare frictional forces between monocrystalline alumina (MA), polycrystalline alumina (PA), and stainless steel (SS) brackets with two SS wires: Rectangular and round. Materials and Methods: In this in vitro study, 60 0.022" brackets [20 PA (0° torque, Forestadent, Germany) and 20 MA (0° torque, Ormco, California, USA)] brackets plus 20 SS brackets (0° torque, Foretadent, Germany) and 60 SS archwires (30 rectangular 0.019" ×0.025" archwires and 30 round 0.018" archwires, Ortho Technology, USA) were used in subgroups of 10 from the combination of all brackets and all archwires. A universal testing machine (Instron, Model STM 250, Germany) was used to investigate the static frictional resistance. The angulation between the bracket and wire was 0°, and the wires were pulled through the slots at a crosshead speed of 10 mm/min. Two-way and one-way analyses of variance (ANOVA) and Tukey tests were used to analyze the data. Results: Mean (SD) static frictional force for each group was as follows: MA + round: 3.47 (0.38); MA + rectangular: 4.05 (0.47); PA + round: 4.14 (0.37); PA + rectangular: 4.45 (0.65); SS + round: 3.28 (0.22); and SS + rectangular: 4.22 (0.61). Significant effects of bracket types (P = 0.001) and archwire types (P = 0.000) on the friction force were detected using ANOVA. Tukey test indicated significant differences between PA brackets with both SS and MA brackets (P < 0.05), but not between SS and MA brackets. The two archwires as well had significantly different effects (Tukey P = 0.000). Conclusions: Based on the present in-vitro study, the PA brackets might create higher frictional forces compared to both SS and MA brackets. The rectangular 0.019" ×0.025" archwire might create greater forces than round 0.018" archwire.

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