Abstract
ABSTRACTIntroduction: There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. Objectives:To evaluate the bond strength and the adhesive remnant index (ARI) of different brands of metal brackets. Material and Methods:A total of 105 bovine incisors were used, and brackets of different brands were bonded to teeth. Seven different bracket brands were tested (MorelliTM, American OrthodonticsTM, TP OrthodonticsTM, Abzil-3MTM, OrthometricTM, TecnidentTM and UNIDENTM). Twenty-four hours after bonding, shear bond strength test was performed; and after debonding, the ARI was determined by using an optical microscope at a 10-fold increase. Results: Mean shear bond strength values ranged from 3.845 ± 3.997 (MorelliTM) to 9.871 ± 5.106 MPa (TecnidentTM). The majority of the ARI index scores was 0 and 1. Conclusion:Among the evaluated brackets, the one with the lowest mean shear bond strength values was MorelliTM. General evaluation of groups indicated that a greater number of bond failure occurred at the enamel/adhesive interface.
Highlights
There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice
This study aims to evaluate the bond strength and the amount of adhesive left on the enamel (Adhesive Remnant Index [adhesive remnant index (ARI)]) after bonding metal brackets with seven different brands, so as to provide useful scientific information that may help clinicians to choose which bracket to use
This indicates that the tested sample showed a greater number of bond failures occurring at the enamel/adhesive interface, which is consonant with other reports in the literature.[15,16]
Summary
There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. There is a wide variation in methods and results of shear bond strength tests in the literature,[10,11,12] which makes the comparison to some of these studies difficult and enhances the need for new and methodologically standardized studies.[11,13] Besides the bonding material used and the enamel surface preparation,[3] the type of bracket and its base design influences bond strength[14] which has to be strong enough to allow the normal course of orthodontic treatment and to resist masticatory efforts.[15,16]. It is important to remember that high bond strength values are potentially dangerous, as they may cause enamel fractures during debonding.[10,16,18] In order to improve adhesive retention to orthodontic metal brackets, different chemical and mechanical retentive base configurations have been proposed,[19] and many different brackets and their base types have been evaluated.[14,15,19,20,21,22,23]
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