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      Effect of different surface treatments on shear bond strength of ceramic brackets to old composite

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          Abstract

          Background

          At present, the demand for orthodontic treatment is on the rise. On the other hand, evidence shows that the bond strength of composite resins to old composite restorations is often unreliable. Therefore, the aim of this in vitro study was to assess the effect of different surface treatments on shear bond strength (SBS) of ceramic brackets to old composite restorations.

          Methods

          In this in vitro experimental study, 60 nano-hybrid composite discs were fabricated. For aging, the discs were incubated in deionized water at 37 °C for 1 month. Next, they underwent 4 different surface treatments namely acid etching with 37% phosphoric acid, sandblasting, grinding, and Er,Cr:YSGG laser irradiation. Ceramic brackets were then bonded to the discs and underwent SBS testing.

          Results

          The maximum mean SBS value was obtained in the grinding group (9.16 ± 2.49 MPa), followed by the sandblasting (8.13 ± 2.58 MPa) and laser (6.57 ± 1.45 MPa) groups. The minimum mean SBS value was noted in the control group (5.07 ± 2.14 MPa).

          Conclusion

          All groups except for the control group showed clinically acceptable SBS. Therefore, grinding, sandblasting, and Er,Cr:YSGG laser are suggested as effective surface treatments for bonding of ceramic orthodontic brackets to aged composite.

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          Most cited references24

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          A Review of Direct Orthodontic Bonding

          I. R. Reynolds (2016)
          Article 0 comments Cited 145 times – based on 0 reviews     Review now
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            Effect of combinations of surface treatments and bonding agents on the bond strength of repaired composites.

            Tamar Brosh, Raphael Pilo, Nitzan Bichacho … (1997)
            Enhancement of bond strength between new and old composite usually requires increasing the surface roughness to promote mechanical interlocking and coating of old composite with unfilled resin bonding agents to advance surface wetting and chemical bonding. The purpose of this study was to evaluate the effect of combinations of surface treatments and bonding agents on the shear bond strength between new and old composite. Six surface treatments, two bonding agents, and an untreated control comprised 18 different subgroups. The use of unfilled resin, alone or combined with silane, was the most effective procedure to enhance the shear bond strength of the repaired composite specimens, irrespective of the surface pretreatment processes. Silanation and unfilled resin slightly but not significantly improved the repair strength compared with unfilled resin alone. Different combinations of surface treatments and bonding agents affect shear bond strength differently. The highest shear bond strength values were achieved by grinding the surface with green Carborundum stone or sandblasting, whereas the lowest values were obtained with hydrofluoric acid as the surface treatment agent.
            Article 0 comments Cited 41 times – based on 0 reviews     Review now
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              Effect of thermocycling on the bond strength of composite resin to bur and laser treated composite resin.

              E Akin Abayomi, Digdem Eren, Seyda Siso … (2012)
              The objective of this study was to investigate the effect of two different surface treatments (Er:YAG laser and bur) and three different numbers of thermal cycling (no aging, 1,000, 5,000, and 10,000 cycles) on the micro-shear bond strength of repaired composite resin. Ninety-six composite blocks (4 mm × 4 mm × 1 mm) obtained with a micromatrix hybrid composite were prepared. The composite blocks were then randomly divided into four groups (n = 24), according to the thermal cycling procedure: (1) stored in distilled water at 37°C for 24 h (control group), (2) 1,000 cycles, (3) 5,000 cycles, and (4) 10,000 cycles. After aging, the blocks were further subdivided into two subgroups (n = 12), according to surface treatment. Bur and laser-treated composite surfaces were treated with an etch&rinse adhesive system. In addition, a microhybrid composite resin was bonded to the surfaces via polyethylene tubing. Specimens were subjected to micro-shear bond strength test by a universal testing machine with a crosshead speed of 0 and 5 mm/min. The data were analyzed using one-way analysis of variance and Tukey tests (α = 0.05) for micro-shear bond strengths. After conducting a bond strength test, it was found that the laser and bur-treated specimens had similar results. Aging with 10,000 thermocycles significantly affected the repair bond strength of composite resins.
              Article 0 comments Cited 29 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Parisa Shokouhi:
                ORCID: http://orcid.org/0000-0002-2629-8648
                parisashokouhi@yahoo.com
                Journal
                Journal ID (nlm-ta): Biomater Res
                Journal ID (iso-abbrev): Biomater Res
                Title: Biomaterials Research
                Publisher: BioMed Central (London )
                ISSN (Print): 1226-4601
                ISSN (Electronic): 2055-7124
                Publication date (Electronic): 25 November 2020
                Publication date PMC-release: 25 November 2020
                Publication date Collection: 2020
                Volume: 24
                Electronic Location Identifier: 20
                Affiliations
                [1 ]GRID grid.411950.8, ISNI 0000 0004 0611 9280, Department of Orthodontics, School of Dentistry, , Hamadan University of Medical Sciences, ; Hamadan, Iran
                [2 ]GRID grid.411950.8, ISNI 0000 0004 0611 9280, Department of Restorative Dentistry, School of Dentistry, Dental Research Center, , Hamadan University of Medical Sciences, ; Hamadan, Iran
                [3 ]GRID grid.411950.8, ISNI 0000 0004 0611 9280, Department of Biostatistics, School of Public Health and Research Center for Health Sciences, , Hamadan University of Medical Sciences, ; Hamadan, Iran
                [4 ]GRID grid.411950.8, ISNI 0000 0004 0611 9280, School of Dentistry, , Hamadan University of Medical Sciences, ; 6517838677 Shahid Fahmideh Street, Hamadan City, Hamadan, Iran
                Author information
                http://orcid.org/0000-0002-2629-8648
                Article
                Publisher ID: 199
                DOI: 10.1186/s40824-020-00199-y
                PMC ID: 7687813
                PubMed ID: 33292632
                SO-VID: 3541a957-60f6-4a52-8473-f4fdb472478e
                Copyright © © The Author(s) 2020
                License:

                Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

                History
                Date received : 8 September 2020
                Date accepted : 10 November 2020
                Funding
                Funded by: Hamadan University of Medical Sciences (IR)
                Award ID: 9804182958
                Award Recipient :
                Categories
                Subject: Research Article
                Custom metadata
                issue-copyright-statement © The Author(s) 2020

                Keywords: shear strength,er,cr:ysgg laser,sandblasting,grinding,in vitro
                Data availability:
                Keywords: shear strength, er,cr:ysgg laser, sandblasting, grinding, in vitro

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