Comparison of the bond strength of orthodontic metallic brackets bonded to different tooth-colored restorative materials and the surface roughness of materials before and after removing the brackets
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Abstract
Objective: This study aimed to compare the shear bond strength (SBS) of metal orthodontic brackets bonded to different tooth-colored restorative materials and the roughness of the restorations before brackets bonding and after removing the brackets.
Materials and Methods: The 50 specimens (N=50) were divided into 5 groups (n=10), including Resin Composite (RC), Porcelain Leucite-based ceramic (PL), Lithium Disilicate glass (LD), Zirconia (ZR), and Hybrid ceramic (HC). The metal bracket 0.022” MBT™ System 3M™ Unitek™ Gemini Brackets Kit (3M ESPE, St. Paul, USA) was bonded on specimens with Universal Silane coupling agents (Monobond N®: Ivoclar Vivadent, Schaan, LiechtensteinI) and light-cure Transbond™ XT Primer and orthodontic adhesive (3M ESPE, St. Paul, USA). The shear bond strength (SBS) was measured by using a Universal testing machine. Adhesive Remnant Index (ARI) was observed under a stereomicroscope. All specimens were polished using the polishing protocol from the manufacturer’s instructions, and the surface roughness value (Ra) was recorded using Surface Roughness Tester-Stylus for contact to compare the roughness of the surface before and after removing the brackets.
Result: The highest shear bond strength was PL group (6.24 MPa), and the lowest was RC group (3.23 MPa).
The shear bond strength (SBS) was significantly different among groups (p<0.05). For ARI scores, most of the specimens in the PL, HC, LD, and ZR groups scored 3, whereas the RC group scored 1. The surface roughness value (Ra) before and after polishing of all groups except the HC group is significantly different. (p<0.05)
Conclusion: Only PL and ZR show high shear bond strength for orthodontic bonding. All groups, except the RC group, have adhesive failure at the adhesive-bracket interface. Therefore, the need to remove the remaining adhesives and the possibility of damage to the material surface are high. The HC group had non significantly different roughness values compared before bracket bonding and after removing the brackets.
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