Comparative study of metal/resin union resistance in two orthodontic bonding techniques of tubes

Abstract

Numerous studies demonstrate that adhesives have excellent bonding to enamel, so the objective of this study is to evaluate the bonding at the interface between the metal of the orthodontic tube and the resin. Materials and Methods: In this shear strength study, Transbond XT 3M™ resin will be used in 40 orthodontic tubes for simple 0.022” lower molars, which will be divided into two groups: 20 orthodontic tubes for the Control Group (GC) and 20 orthodontic tubes for the Experimental Group (GP). In the GC, a layer of 1mm orthodontic cementation resin will be added, followed by light curing with 0mm distance for 10 seconds to avoid maximum contraction of the resin, plus 20 seconds of continuous light curing, using a 700 MW lamp, and a second layer of 2mm rectangular to the shape of the base of the orthodontic tube for the application of the shear test. For the Experimental Group (GP), the metallic mesh at the base of the tube was conditioned with the application of micro abrasion with a 50 micron aluminum oxide jet, for 8 seconds at a distance of 2 to 3 mm across the surface of the mesh. tube, at an air pressure of 90 Pa, controlled by a compressed air barometer. Immediately afterwards, aluminum oxide impurities were removed using an air and water syringe from the dental unit. On the clean surface, the Transbond XT™ Primer Adhesive system was applied with light curing for 10 seconds with 0mm continuous LED light, then the Transbond XT™ resin was placed in 3 layers of 1 mm, with 10 seconds of light curing at 0 mm. All specimens were marked and taken to the universal testing machine where the force will be applied to the resin surface attached to the mesh of the orthodontic tube, at a distance of 0.8 mm from the mesh. They are numerical values, so the Student's t-test for independent samples was selected. Based on the results obtained, it is stated that the Control GC Group and the Experimental Group with the conditioning of aluminum oxide jet to the bases of orthodontic tubes, do not present a statistically significant difference.