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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

Published in:

29-11-2022 | Computer Aided Manufacturing | Original Article

Influence of surface treatments on the bond strength of metal brackets to CAD/CAM materials and discoloration after various refinishing procedures

Scanning electron microscopy and atomic force microscopy study

Authors: Murat Tunca, Beyza Unalan Degirmenci

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Special Issue 3/2023

Abstract

Purpose

This study evaluated the shear bond strength (SBS) of a metal bracket bonded to three different computer-aided design/computer-aided manufacturing (CAD/CAM) restoration materials pretreated with different surface treatments. In addition, the surface topography and color change of the restorations after debonding with two different tungsten carbide burs were examined.

Methods

A total of 216 plates were cut from three different CAD/CAM blocks, each of which was divided into three subgroups with different pretreatment methods: (1) acid etching, (2) sandblasting, and (3) laser irradiation. Incisor metal brackets were bonded. The SBS test was performed, and the failure types were classified. Then, samples were randomly divided into two subgroups according to the adhesive removal procedure to be used: a tungsten carbide bur with 12 blades or 24 blades (n = 12). Color change was calculated based on the ∆E₀₀, and surface morphology was evaluated via SEM and AFM analysis.

Results

The SBS data revealed that the type of CAD/CAM material and the applied surface treatment significantly affected bond strength. The highest SBS values were detected for the Grandio Blocs (VOCO GmbH, Cuxhaven, Germany; 14.3 ± 4.4 MPa), and the lowest was observed for Cerasmart (GC Europe, Leuven, Belgium; 12.0 ± 4.0 MPa). The ∆E₀₀ results demonstrated significant differences only as a result of the applied surface treatment. The ∆E₀₀ value in all groups was above the 1.77 threshold.

Conclusion

CAD/CAM material types and surface treatments affected the bond strength, but the interactions of these factors did not. The chosen surface treatment also significantly affected the ∆E₀₀ after the polishing was done.

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Title: Influence of surface treatments on the bond strength of metal brackets to CAD/CAM materials and discoloration after various refinishing procedures
Scanning electron microscopy and atomic force microscopy study
Authors: Murat Tunca
Beyza Unalan Degirmenci
Publication date: 29-11-2022
Publisher: Springer Medizin
Keywords: Computer Aided Manufacturing
Computer Aided Design
Laser
Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Issue Special Issue 3/2023
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-022-00434-2

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Influence of surface treatments on the bond strength of metal brackets to CAD/CAM materials and discoloration after various refinishing procedures

Scanning electron microscopy and atomic force microscopy study

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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