LED LIGHT TIP DISTANCE EFFECT ON SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS: IN-VITRO STUDY

Abstract

Various attempts have been made to improve the shear bond strength of brackets. Aim of current research was to compare the mean shear bond strength (MSB) of adhesive cured at 0mm and 5mm curing light tip distances. This in-vitro comparative research involved 40 extracted human bicuspids that were classified into 2 groups of 20 teeth each, using random number table method. Group A, teeth brackets were cured at light tip distance of 0 mm and Group B, at 5 mm distance. After bonding with standardized protocol, all samples were stored and subsequently tested for MSB using universal testing machine. t-test was used for comparison of MSB in both the groups. Duration of this study was January 2017 to October 2017. Results showed that MSB of metal brackets cured at 0mm and 5mm light curing tip distance was similar. It was concluded that there was statistically insignificant difference of curing distance on mean shear bond strength of orthodontic brackets.