Evaluation of Kinetic Friction In Monocrystilline Ceramic, Polycrystalline Ceramic And Composite Brackets In Dry And Wet Field

The study was done to evaluate the kinetic frictional resistance generated by aesthetic brackets and to compare brackets using a 19×25 SS straight length wire in a 0.022 slot and to select a bracket base on the frictional characteristics.

In this study, three different types of brackets system were selected. They are Group: 1- Monocrystalline ceramic, Group: 2- Polycrystalline ceramic, and Group: 3- Composite brackets (JJ orthodontics). In this study, four pre-angulated and pre-torque mandibular central incisors brackets with 00 tip and -60 torque were used. All the brackets were of 0.022 X 0.030 in pre adjusted edgewise appliance. Four brackets were bonded to an acrylic sheet of dimension 20 X 5 cm. The brackets and wire units were submitted to frictional test with instron universal testing machine (No-3382). This friction test was done in both dry and wet condition. Artificial saliva was used to stimulate the oral condition. The lower cross head was design to hold the acrylic fixture, and upper cross head was holding the wire. Each sample was pulled at the speed of 2mm per 1mm. Descriptive stastical information including mean and standard deviation of maximum frictional force was calculated for each brackets wire combination.

In both dry and wet condition, composite brackets expressed a statically significant higher frictional value with respected to monocrystilline and polycrystalline brackets. Polycrystalline ceramic brackets showed less frictional resistance when compared to other two groups. Monocrystalline ceramic brackets showed intermittent frictional value.

To conclude the polycrystalline ceramic brackets showed least friction among the 3 groups followed by monocrystalline ceramic and polycrystalline ceramic.