Comparison of the frictional characteristics of aesthetic orthodontic brackets measured using a modified in vitro technique
Arici Nursel, Akdeniz Berat Serdar, Arici Selim,
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( Arici Nursel ) - Ondokuz Mayis University Faculty of Dentistry Department of Orthodontics
( Akdeniz Berat Serdar ) - Ondokuz Mayis University Faculty of Dentistry Department of Orthodontics
( Arici Selim ) - Ondokuz Mayis University Faculty of Dentistry Department of Orthodontics
KMID : 0361920150450010029
Abstract
Objective: The coefficients of friction (COFs) of aesthetic ceramic and stainless steel brackets used in conjunction with stainless steel archwires were investigated using a modified linear tribometer and special computer software, and the effects of the bracket slot size (0.018 inches [in] or 0.022 in) and materials (ceramic or metal) on the COF were determined.
Methods: Four types of ceramic (one with a stainless steel slot) and one conventional stainless steel bracket were tested with two types of archwire sizes: a 0.017 ¡¿ 0.025-in wire in the 0.018-in slots and a 0.019 ¡¿ 0.025-in wire in the 0.022-in slot brackets. For pairwise comparisons between the 0.018-in and 0.022-in slot sizes in the same bracket, an independent sample t-test was used. One-way and two-way analysis of variance (ANOVA) and Tukey¡¯s post-hoc test at the 95% confidence level (¥á = 0.05) were also used for statistical analyses.
Results: There were significant differences between the 0.022-in and 0.018-in slot sizes for the same brand of bracket. ANOVA also showed that both slot size and bracket slot material had significant effects on COF values (p < 0.001). The ceramic bracket with a 0.022-in stainless steel slot showed the lowest mean COF (¥ì = 0.18), followed by the conventional stainless steel bracket with a 0.022-in slot (¥ì = 0.21). The monocrystalline alumina ceramic bracket with a 0.018-in slot had the highest COF (¥ì = 0.85).
Conclusions: Brackets with stainless steel slots exhibit lower COFs than ceramic slot brackets. All brackets show lower COFs as the slot size increases.
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Brackets; Archwires; Coefficient of friction; Tribometer
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