The effects of various surface treatments on the shear bond strengths of stainless steel brackets to artificially-aged composite restorations

Eslamian, Ladan, Borzabadi Farahani, Ali ORCID: https://orcid.org/0000-0002-3729-2348, Mousavi, Nasin and Ghasemi, Amir 2011. The effects of various surface treatments on the shear bond strengths of stainless steel brackets to artificially-aged composite restorations. Australasian Orthodontic Journal 27 (1) , pp. 28-32. 10.2478/aoj-2011-0006

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Abstract

Objective: To compare the shear bond strengths (SBS) of stainless steel brackets bonded to artificially-aged composite restorations after different surface treatments. Methods: Forty-five premolar teeth were restored with a nano-hybrid composite (Tetric EvoCeram), stored in deionised water for one week and randomly divided into three equal groups: Group I, the restorations were exposed to 5 per cent hydrofluoric acid for 60 seconds; Group II, the restorations were abraded with a micro-etcher (50 μm alumina particles); Group III, the restorations were roughened with a coarse diamond bur. Similar premolar brackets were bonded to each restoration using the same resin adhesive and the specimens were then cycled in deionised water between 5 °C and 55 °C (500 cycles). The shear bond strengths were determined with a universal testing machine at a crosshead speed of 1 mm/min. The teeth and brackets were examined under a stereomicroscope and the adhesive remnants on the teeth scored with the adhesive remnant index (ARI). Results: Specimens treated with the diamond bur had a significantly higher SBS (Mean: 18.45 ± 3.82 MPa) than the group treated with hydrofluoric acid (Mean: 12.85 ± 5.20 MPa). The mean SBS difference between the air-abrasion (Mean: 15.36 ± 4.92 MPa) and hydrofluoric acid groups was not significant. High ARI scores occurred following abrasion with a diamond bur (100 per cent) and micro-etcher (80 per cent). In approximately two thirds of the teeth no adhesive was left on the restoration after surface treatment with hydofluoric acid. Conclusion: Surface treatment with a diamond bur resulted in a high bond strength between stainless steel brackets and artificially-aged composite restorations and was considered to be a safe and effective method of surface treatment. Most of the adhesive remained on the tooth following surface treatment with either the micro-etcher or the diamond bur.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Dentistry
Publisher:	Sciendo
ISSN:	2207-7480
Date of First Compliant Deposit:	25 October 2024
Date of Acceptance:	1 December 2010
Last Modified:	18 Oct 2026 21:45
URI:	https://orca.cardiff.ac.uk/id/eprint/173336

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