The Influence of Bracket Type and Etching Time on Shear Bond Strength to Enamel – An In Vitro Study:

Vladimir Mitić; Ana  Todorovic; Aleksandar Mitic; Kosta Todorovic; Milan Miljkovic

doi:10.5937/afmnai41-46364

Vladimir Mitić Medicinski fakultet Niš
Ana Todorovic University of Nis, Faculty of Medicine, Department of Orthopedics of Jaws and Teeth, Nis, Serbia
Aleksandar Mitic University of Niš, Faculty of Medicine, Department of Restorative Dentistry and Endodontics, Niš, Serbia
Kosta Todorovic University of Niš, Faculty of Medicine, Department of Oral Surgery, Niš, Serbia
Milan Miljkovic University of Niš, Faculty of Medicine, Research Centre for Biomedicine, Niš, Serbia

DOI: https://doi.org/10.5937/afmnai41-46364

Keywords: adhesion, dental materials, demineralization, separation force

Abstract

Introduction. The aim of this study was to compare the shear bond strength between two different types of bonded metal brackets and acid-etched enamel surface in two different times.

Materials and methods. Forty extracted human premolars were randomly divided into 4 groups. In groups 1 and 2, metal brackets Topic (Dentaurum, Germany) were bonded after etching with 37 % phosphoric acid (Gel, Reliance, USA) for 15 and 30 s, while in groups 3 and 4, metal brackets Equilibrium mini (Dentaurum, Germany) were bonded after etching for 15 and 30 s. Brackets were bonded using flowable composite Heliosit Orthodontic (Ivoclar Vivadent, Liechtenstein) and light-cured using a LED lamp. The SBS was measured by an electronic dynamometer at a cross-head speed of 5 mm/min.

Results. The statistical analysis revealed that the SBS is affected by both bracket type (t=10.62; p<0.01) and etching time (t=2.81; p=0.008). The Equilibrium mini brackets with previous enamel etching for 30 s showed the highest SBS values 10.8 ± 0.75 MPa, while the Topic brackets with previous enamel etching for 15 s showed the lowest values 4.85 ± 0.53 MPa.

Conclusion. Increasing the etching time of tooth enamel leads to higher values in bond strength, especially when using a bracket with a smaller base.

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