Comparison of Frictional Resistance Produced by Self-ligating Brackets and Conventional Brackets Ligated with Various Types of Ligature
The aim of the study was to compare frictional resistance among self-ligating brackets and the conventional brackets ligated with five types of ligature. 0.021×0.025-inch straight stainless steel (SS) wire were ligated on maxillary premolar brackets with 0.022-inch slots using six types of ligation method, 10 samples for each group. Five types of ligature: 1) 0.010-inch SS ligatures, 2) conventional elastomeric ligatures, 3) polymeric-coated elastomeric ligatures, 4) low-friction elastomeric ligatures, and 5) low-friction clip ligatures were ligated on standard SS brackets in Groups 1 to 5, respectively. SS passive self-ligating brackets were used in Group 6. The frictional resistance of each sample was measured using a universal testing machine. The data were analyzed using the One-way ANOVA test followed by Dunnett's post-hoc test (p<0.05).
Polymeric-coated elastomeric ligatures produced the greatest frictional resistance. Low-friction clip ligatures produced the least frictional resistance and was not significantly different from that produced by SS ligatures, low-friction elastomeric ligatures, or self-ligating brackets, but was significantly less than that of conventional elastomeric ligatures or polymeric-coated elastomeric ligatures.
In conclusion, the tube-like designs (the low-friction elastomeric ligature, the low-friction clip ligature, and the self-ligating bracket) produced less frictional resistance than did the conventional and polymeric-coated elastomeric ligature.
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