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. 2025 Jun;17(Suppl 2):S1338-S1340.
doi: 10.4103/jpbs.jpbs_51_25. Epub 2025 Jun 18.

Evaluation of the Shear Bond Strength of Three Types of Retainer Wires Bonded with a Composite Adhesive: An in vitro Study

N Harish Kumar  1 , Rabindra S Nayak  2 , Tulip Chakravarty  3 , Annesha K Konwar  4 , Nirajita Bhaduri  5 , Nunna S Pratyusha  6
Affiliations

Evaluation of the Shear Bond Strength of Three Types of Retainer Wires Bonded with a Composite Adhesive: An in vitro Study

N Harish Kumar et al. J Pharm Bioallied Sci. 2025 Jun.

Abstract

Background and objectives: Posttreatment tooth movement, or relapse, is a common challenge in orthodontics. Bonded retainers are widely used to preserve corrected tooth positions. This study evaluates the mechanical properties of different lingual retainer wires combined with composite bonding materials.

Materials and method: Ninety human incisors were divided into three groups, each using different retainer wires: Retainium, Bond-A-Braid, and Custom-Made Ligature wires, bonded with Transbond LR composite. Shear bond strength (SBS), flexural properties, and load-deflection rates (LDR) were analyzed through a universal testing machine (UTM) debonding, tensile tests, and three-point bend tests. Statistical comparisons were made using Kruskal-Wallis and ANOVA tests.

Results: Group III showed the highest SBS, while Custom-Made Ligature wires exhibited superior stiffness and LDR.

Conclusion: Custom-Made Ligature wires offer better mechanical properties, and Group III demonstrated the strongest bond strength, highlighting the importance of material selection in orthodontic retention.

Keywords: Bonded retainers; flexural properties; lingual wires; load–deflection rate; orthodontics; relapse prevention; shear bond strength.

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Conflict of interest statement

The authors declare that they have no conflicts of interest.

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