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Early versus delayed rebonding of orthodontic brackets
Farzaneh Ahrari1, Maryam Poosti, Majid Akbari
1Dental Materials Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Progress in Orthodontics
|May 16, 2012
Summary
Removing composite with a round bur significantly decreased shear bond strength (SBS) in orthodontic rebonding. Using tungsten carbide burs or green rubber wheels for composite removal maintained SBS. Delayed rebonding did not impact SBS.
Area of Science:
- Dental Materials Science
- Orthodontic Technology
- Biomaterials Engineering
Background:
- Controversy exists regarding the impact of repeated bonding on the shear bond strength (SBS) of orthodontic attachments.
- Understanding optimal composite removal techniques is crucial for maintaining bracket bond integrity after debonding.
Purpose of the Study:
- To evaluate the effect of early versus delayed rebonding on bracket SBS.
- To compare the influence of different composite removal methods on subsequent bracket SBS.
Main Methods:
- Sixty-eight premolars were divided into four groups for debonding and rebonding.
- Composite removal utilized round burs, green rubber wheels, or tungsten carbide burs.
- One group underwent delayed rebonding after a one-month simulated oral environment exposure.
Main Results:
- Composite removal with a round bur significantly reduced rebonding strength (p<0.05).
- Tungsten carbide burs and green rubber wheels did not significantly affect SBS (p>0.05).
- Delayed rebonding showed no significant impact on SBS (p>0.05).
Conclusions:
- Postponing bracket rebonding does not significantly improve SBS.
- Tungsten carbide burs or green rubber wheels are recommended for composite removal over round burs to preserve SBS.
