Comparison Of Shear Bond Strength Of Resin And Metal Brackets With Different Adhesives In Vitro

Objective:The majority of modern orthodontic patients are adults, and more of them are female. Along with the extensive development of adults orthodontics, special requests of occupation, patients usually hope the orthodontic appliances can remain in concealment or little outside. Hence accelerate the development and application of nonmetal bracket, ceramic bracket and transparent resin bracket are commonly used. The price of ceramic bracket is higher, While resin bracket is relative cheaper and slinky, which tends toward be accepted. In clinical practices, resin brackets have limitation which inadequate in adhesive strength and have high rate of bracket loss. These characters prevent the extensive developing of resin brackets. Resin brackets can be widely used when the problem of bond strength can be well solved, they will look after both sides the beautiful of ceramics bracket and economic advantages of the stainless steel bracket.This experiment selected to use three kinds of orthodontic adhesives: jingjin enamel adhesive; self-etch light-cured composite resin adhesive (3M) single-component adhesive (the united states bisco;ortho-one).two kinds of brackets were selected: metal brackets, resin bracket. Select the best adhesive for the metal and resin bracket .the aim of this study was to find the best adhesive-bracket fabricate to guide the clinical practices.Materials and methods:Selected one hundred and twenty human premolars without caries, extracted for orthodontic reasons. All teeth were stored in 0.5% aqueouschloramines T.the specimens were cleaned and stored at room temoerature. The longest conservation time was not more than 6 months.