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Review
. 2023 Feb 14:20:25.
doi: 10.4103/1735-3327.369627. eCollection 2023.

Comparison of shear bond strength of rebonded stainless steel brackets with three different enamel surface conditioning methods

Saba Safarzadeh  1 , Marzieh Kachuie  2 , Reza Birang  3 , Saeid Sadeghian  2
Affiliations
Review

Comparison of shear bond strength of rebonded stainless steel brackets with three different enamel surface conditioning methods

Saba Safarzadeh et al. Dent Res J (Isfahan). .

Abstract

Background: During the orthodontic bonding process, the need for repositioning or rebonding of orthodontic brackets on the enamel surface occurs frequently. The aim of this study is to compare the shear bond strength (SBS) in rebonding orthodontic stainless steel brackets with three different methods of enamel surface conditioning methods.

Materials and methods: In this in vitro study, 80 human premolars that were extracted for orthodontic purposes were randomly divided into four groups and underwent orthodontic bonding procedure (N = 20). Except for the control group, three other groups underwent debonding and rebonding process in which after removing the remaining adhesive with tungsten-carbide bur, enamel surface conditioned by three different methods including re-etching with phosphoric acid, sandblasting + acid etching, and Erbium-doped Yttrium-Aluminum-Garnet laser. Then, the SBS of the bracket to the enamel surface was compared between different groups. Scanning Electron microscopy images were also obtained from a number of samples. Statistical analysis was performed by Kruskal-Wallis and Mann-Whitney tests.

Results: The highest SBS was observed in the primary bond (control group) with an average of 29,440 MPa. There was a significant difference between the studied groups (P < 0.001) and only the group that was re-etched with phosphoric acid had no significant difference with the control group (P = 0.708) ∝ =0.05.

Conclusion: Rebonding of brackets using phosphoric acid for reconditioning of the enamel surface creates bond strength comparable to the primary bond. Other groups had significantly lower SBS than the control group.

Keywords: Dental air abrasion; dental bonding; dental debonding; orthodontic bracket; shear strength.

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Conflict of interest statement

The authors of this manuscript declare that they have no conflicts of interest, real or perceived, financial or non-financial in this article.

Figures

Figure 1
Figure 1
SEM images: (a) Primary etching with phosphoric. (b) Re-etching with phosphoric acid. (c) Re-etching with sandblasting + phosphoric acid. (d) Re-etching with Er:YAG laser. SEM: Scanning electron microscope; Er:YAG: Erbium-doped yttrium aluminum garnet.
See this image and copyright information in PMC

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