frictional resistance of two types of esthetic self-ligating brackets

Background and objective: friction between the archwire and bracket is the main problem during tooth movement. self-ligating bracket systems have become common in recent years. the aim of this study was to investigate and compare the effect of active and passive esthetic self-ligating brackets on static frictional force with different orthodontic archwires under wet conditions.methods: this in vitro study included 180 ceramic self-ligating brackets, 90 passive brackets (damon clear), and 90 active brackets (empower clear), which were tested for frictional resistance using three different types of 0.018-inch archwires, namely copper niti archwires and two esthetic archwires (epoxy- and rhodium-coated niti archwires). according to the types of brackets and archwires, six groups of ten were defined. an experimental model with three non-leveled brackets in wet condition using artificial saliva was adopted. the friction test was conducted by instron tinius olsen testing device. the test was performed at a room temperature ranging from 24-25°c.findings: empower clear with cu niti archwire showed the highest mean value of static frictional force with the mean value of (327.85±53.43) and damon clear with epoxy coated niti archwire showed the lowest mean value (58.06±10.87). there were significant differences in the static frictional forces generated in both bracket systems when coupled with the epoxy wires (p=0.000) and when coupled with the cuniti and rhodium archwires (p=0.001).conclusion: the result of this study showed that the damon clear brackets produce lower frictional forces than empower clear brackets and epoxy-coated niti archwires can produce lower static frictional force compared to rhodium-coated niti and cuniti archwires. 

frictional resistance of two types of esthetic self-ligating brackets

background and objective: friction between the archwire and bracket is the main problem during tooth movement. self-ligating bracket systems have become common in recent years. the aim of this study was to investigate and compare the effect of active and passive esthetic self-ligating brackets on static frictional force with different orthodontic archwires under wet conditions.methods: this in vitro study included 180 ceramic self-ligating brackets, 90 passive brackets (damon clear), and 90 active brackets (empower clear), which were tested for frictional resistance using three different types of 0.018-inch archwires, namely copper niti archwires and two esthetic archwires (epoxy- and rhodium-coated niti archwires). according to the types of brackets and archwires, six groups of ten were defined. an experimental model with three non-leveled brackets in wet condition using artificial saliva was adopted. the friction test was conducted by instron tinius olsen testing device. the test was performed at a room temperature ranging from 24-25°c.findings: empower clear with cu niti archwire showed the highest mean value of static frictional force with the mean value of (327.85±53.43) and damon clear with epoxy coated niti archwire showed the lowest mean value (58.06±10.87). there were significant differences in the static frictional forces generated in both bracket systems when coupled with the epoxy wires (p=0.000) and when coupled with the cuniti and rhodium archwires (p=0.001).conclusion: the result of this study showed that the damon clear brackets produce lower frictional forces than empower clear brackets and epoxy-coated niti archwires can produce lower static frictional force compared to rhodium-coated niti and cuniti archwires.