Abstract
Aims: This study was aimed to compare static frictional forces generated by 3 types of brackets (conventional, active self-ligating and passive self-ligating) combined with 3 different sizes of stainless steel wire. Material and Methods: The sample consisted of three types of brackets (Equilibrium 2, Empower, discovery sl) with a slot size 0.022 inch were coupled with 0.020, 0.018×0.025 and 0.019×0.025 inches stainless steel wires, The testing model consists of 6 brackets used to represent lower anterior teeth. Ten tests were carried out for each group of bracket-wire combination in dry state, frictional force were measured by tensile testing machine. A significant P value of 0.05 was predetermined. Results: self-ligating brackets produced significantly lower value (P ≤0.05) of mean of static friction than elastomerically tied conventional bracket. The frictional force increased proportionally to the wire size. Conclusions: The method of ligation appears to be the primary variable responsible for the frictional resistance generated by these types of brackets.
Highlights
The introduction of the preadjusted edgewise system reduced substantially the need for wire bending, but relies on sliding mechanics to move teeth, especially during space closure, whenever sliding occurs, frictional resistance is encountered.[1]
Various Self–Ligating Brackets (SLBs) have been developed, those that have a spring clip that presses against the archwire (“active” SLBs), and those in which the self-ligating clip does not press against the wire (“passive” SLBs),(4) several previous studies demonstrated a significant www.rafidaindentj.net
Decrease in friction for self-ligating brackets, compared to conventional stainless steel brackets. Such a reduction in friction can help shorten chair time and treatment.[5]. The purpose of this in vitro study was to compare static frictional forces generated by 3 types of brackets in combination with 3 different wire sections (0.020, 0.018×0.025 and 0.019×0.025 inches) in dry state
Summary
The introduction of the preadjusted edgewise system reduced substantially the need for wire bending, but relies on sliding mechanics to move teeth, especially during space closure, whenever sliding occurs, frictional resistance is encountered.[1]. Such a reduction in friction can help shorten chair time and treatment.[5]. The purpose of this in vitro study was to compare static frictional forces generated by 3 types of brackets (elastomerically tied conventional bracket, active selfligating and passive self-ligating brackets) in combination with 3 different wire sections (0.020, 0.018×0.025 and 0.019×0.025 inches) in dry state
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