Abstract
Abstract Introduction The Barbosa Versatile bracket design may provide lower frictional force and greater sliding. However, no in vitro studies have shown its sliding mechanisms and frictional resistance, particularly in comparison with other self-ligating or conventional brackets. Objective To compare the frictional resistance among self-ligating brackets (EasyClip/ Aditek, Damon MX/ Ormco and In Ovation R/ GAC); conventional brackets (Balance Roth/ GAC, and Roth Monobloc/ Morelli); and Barbosa Versatile bracket (Barbosa Versatile/ GAC) with different angles and arch wires. Material and method Brackets were tested with the 0.014", 0.018", 0.019"×0.025" and 0.021"×0.025" stainless steel wires, with 0, 5, 10, 15 and 20 degree angulations. Tying was performed with elastomeric ligature for conventional and Barbosa Versatile brackets, or with a built-in clip system of the self-ligating brackets. A universal testing machine was used to obtain sliding strength and friction value readouts between brackets and wires. Result Three-way factorial ANOVA 4×5×6 (brackets × angulation × wire) and Tukey tests showed statistically significant differences for all factors and all interactions (p<0.0001). Static frictional resistance showed a lower rate for Barbosa Versatile bracket and higher rates for Roth Monobloc and Balance brackets. Conclusion The lowest frictional resistance was obtained with the Barbosa Versatile bracket and self-ligating brackets in comparison with the conventional type. Increasing the diameter of the wires increased the frictional resistance. Smaller angles produced less frictional resistance.
Highlights
The Barbosa Versatile bracket design may provide lower frictional force and greater sliding
The null hypothesis tested was that there would be no differences in frictional resistance between self‐ligating and conventional brackets with different angles and wires
The experimental units consisted of self-ligating brackets (In‐Ovation R, Damon MX, and EasyClip), conventional brackets (Balance Roth, and Roth Monobloc), and the Barbosa Versatile (BV) bracket (Figure 1 and Table 1) with different diameters of round and rectangular wires subjected to static frictional resistance at different angles (n=5) (Table 1)
Summary
The Barbosa Versatile bracket design may provide lower frictional force and greater sliding. The Barbosa Versatile (BV) bracket[19] design may provide lower frictional force, greater sliding, and require less anchorage. It is not a self-ligating bracket, it has a slot with a concavity at the bottom to create only two points of contact instead of a contact surface. The aim of this in vitro study was to compare the static frictional resistance among three types of self-ligating brackets and three conventional brackets with different angles and wires. The null hypothesis tested was that there would be no differences in frictional resistance between self‐ligating and conventional brackets with different angles and wires
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