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Bond strength of various bracket base designs
Wei Nan Wang1, Chung Hsing Li, Ta Hsiung Chou
1College of Oral Medicine, Taipei Medical University, Taiwan. weinan@tmu.edu.tw
Summary
Bracket base design significantly impacts orthodontic bracket bond strength. Circular concave bases, like the Tomy bracket, offer superior bond strength compared to mesh designs, with larger mesh sizes performing better. This research aids in selecting optimal bracket bases for improved clinical outcomes.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Materials
Background:
- Orthodontic bracket debonding is a critical clinical concern.
- Bracket base design influences bond strength and failure modes.
- Understanding these factors is essential for predictable clinical performance.
Purpose of the Study:
- To evaluate the influence of various metal interlock bracket base designs on bond strength.
- To analyze the debonding interface characteristics of different bracket bases.
- To compare the performance of retention groove and mesh-based bracket designs.
Main Methods:
- Six types of metal interlock brackets with distinct base designs were tested.
- Brackets were bonded to human teeth and subjected to debonding tests.
- Debond interfaces were analyzed using scanning electron microscopy and energy-dispersive x-ray spectrometry.
Main Results:
- The Tomy bracket (circular concave base) exhibited the highest bond strength.
- Among mesh-based brackets, Dentaurum (larger mesh size) showed superior bond strength.
- Debonding occurred at the bracket-resin, within-resin, or resin-enamel interfaces, with bracket-resin and resin-enamel being most common.
Conclusions:
- Circular concave bracket bases provide greater bond strength than mesh designs.
- Larger mesh sizes in mesh-based brackets correlate with increased bond strength.
- Bracket base design is a crucial determinant of bond strength and debonding behavior in orthodontic treatment.