Comparison of the frictional resistance between archwire and different bracket system: An in vitro study

Abstract

Background and Objectives:The purpose of this study is to evaluate the frictional resistance generated by conventional stainless steel, radiance ceramic bracket, self-ligating and composite brackets using a 0.019 × 0.025 stainless steel straight length wires in a 022 slot and to select brackets based on their frictional characteristic.Methodology:In order to conduct this study, four different types of bracket system were selected of the mclaughlin-bennet-trevesi (MBT) discipline. They are Group 1 - stainless steel, Group 2 - composite bracket Group 3 - (American Orthodontics) radiance ceramic bracket Group 4 - self-ligating bracket (SLB) (Empower). In this study, five maxillary brackets of an arch of each type were used. All brackets are 0.022 × 0.028 in preadjusted edgewise appliance which simulates the dental arch. Five brackets were bonded to a stainless steel bar of dimension 150 mm × 25 mm × 3 mm. The bracket-arch wire units were submitted to mechanical test with an Instron universal testing machine 3365. A testing apparatus or holding jig was designed to hold the bracket during the mechanical test. Each sample was pulled at a speed of 6 mm for 1 min. Descriptive statistical information including mean and standard deviation of maximum friction force was calculated for each bracket wire combination.Interpretation and Conclusion:The SLB has the least friction among the four groups. The ceramic bracket showed the highest friction followed by stainless steel bracket, composite bracket, and SLB.

Evaluation of friction in metal, ceramic and self-ligating brackets submitted to sliding mechanics

“…In the present study, we observed that in sliding mechanics, the ceramic bracket presented significantly higher frictional force values than the metal and self-ligating brackets, corroborating the findings in the studies [19][20][21] . One of the causes of high frictional force on ceramic brackets may be due to the scratches found on these brackets, which make sliding difficult, thus increasing the time of orthodontic treatment 22 .…”

Dynamic contact characteristics between hoisting rope and friction lining in the deep coal mine

“…14a shows that as the coefficient of friction increases from 0.25 to 0.3, transitional locations between partial slip and stick states both move towards the high-tension side (left end), which indicates a decrease in γ and an increase in φ, and thereby reduces the possibility of gross slip between the rope and friction lining and the induced skid accidents. An increase of coefficient of friction induces larger frictional resistance [32,33], and thus causes decreases in the partial slip range, γ. An increase in partial slip range, φ, is probably induced by combined effects of an increase of coefficient of friction and a decrease in the contact pressure in the sticking arc (Fig.…”

Possible Advantages of Self-Ligating Brackets: From Claims to Evidence, a Literature Review

“…But when larger wires are used (like 0.016 × 0.022 and 0.019 × 0.025 nickel-titanium), no differences were found between SLBs and CBs (11). Pillai et al by evaluating frictional resistance generated by conventional stainless steel, radiance ceramic, selfligating and composite brackets concluded that SLB has the least friction among these four types of brackets (12). Leite et al also confirmed this finding in his research in 2014.…”