Evaluation of frictional forces generated between three different ligation methods with four different sizes of orthodontic archwires: An in vitro study

Aim: This in vitro study was done to evaluate and compare the frictional forces produced by a passive self-ligating bracket (SLB) and two types of elastomeric ligatures (unconventional elastomeric ligatures [UELs] and conventional elastomeric ligatures [CELs]) on a conventional bracket used with four types of wires. Materials: In this in vitro study, 8 numbers of conventional preadjusted edgewise appliance stainless steel brackets and 4 numbers of passive SLBs were tested. Four types of archwires and two types of ligatures were tested. Brackets were divided into three groups-Group I, Group II, and Group III. All the three groups were further divided into four subgroups based on different archwires. Methods: Custom-made mounting jig was specially constructed for this study-upper member and lower member. After the samples were mounted, traction test was conducted using universal testing machine and readings were tabulated for all specimens. The variables in each group were subjected to one-way analysis of variance. Results: All the three groups were tested for its total friction, static friction, and kinetic friction. SLBs showed a static mean little lower and had kinetic mean little greater than conventional bracket with unconventional module. Conclusion: UELs on conventional brackets and SLBs are able to produce lower frictional force when compared with CELs on conventional brackets.