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The Influence of Orthodontic Bracket Base Design and Bonding System on Shear Bond Strength
Maria Manuela Nardin1, Alin Gabriel Ionescu2, Alexandra Elena Done3
1Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania.
Journal of Functional Biomaterials
|March 27, 2026
Summary
Orthodontic bracket design and bonding systems minimally impact shear bond strength. Further research is needed to identify other factors influencing bracket adhesion during orthodontic therapy.
Area of Science:
- Dental Materials Science
- Orthodontics
- Biomaterials Engineering
Background:
- Effective orthodontic therapy relies on continuous force application, necessitating strong bracket-enamel adhesion.
- Bracket base design and bonding systems are critical factors influencing the success of orthodontic treatment.
- Understanding the interplay between bracket features and bonding agents is essential for optimizing clinical outcomes.
Purpose of the Study:
- To evaluate the influence of different metal bracket base designs (80-gauge mesh vs. anchor pylons) and bonding systems (conventional vs. self-etching) on shear bond strength.
- To determine if bracket base design or bonding system significantly affects the bond strength of orthodontic brackets to enamel.
- To investigate potential interaction effects between bracket design and bonding system on shear bond strength.
Main Methods:
- Eighty extracted premolars were randomly assigned to four groups, each representing a unique combination of bracket base design and bonding system.
- Shear bond strength testing was conducted using a Laryee Universal Testing Machine.
- Statistical analysis, including ANOVA, was performed to assess differences in shear bond strength and identify significant interactions.
Main Results:
- Slightly higher shear bond strength was observed for anchor pylon brackets with the conventional bonding system (13.32 N/mm²).
- The lowest shear bond strength was recorded for anchor pylon brackets with the self-etching system (11.10 N/mm²).
- ANOVA revealed no statistically significant differences in shear bond strength between bracket types, bonding techniques, or their interaction.
Conclusions:
- Neither bracket base design nor bonding system significantly influenced shear bond strength in this study.
- Additional factors beyond bracket design and bonding system likely play a crucial role in overall bracket adhesion.
- Further investigation is warranted to identify and evaluate these other contributing factors for enhanced orthodontic treatment efficacy.
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