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Enamel cracks and ceramic bracket failure during debonding in vitro.
Samir E Bishara1, Adam Wade Ostby, John Laffoon
1Orthodontic Department, College of Dentistry, University of Iowa, Iowa City, IA 52242, USA. samir-bishara@uiowa.edu
The Angle Orthodontist
|October 25, 2008
Summary
A new ceramic bracket debonding instrument reduced bracket fracture incidence compared to conventional pliers. This instrument also improved adhesive removal from teeth during debonding.
Area of Science:
- Dental Materials Science
- Orthodontic Technology
Background:
- Ceramic brackets are widely used in orthodontics.
- Efficient and safe debonding of orthodontic brackets is crucial to prevent enamel damage and bracket fracture.
Purpose of the Study:
- To compare the bracket failure characteristics of a new ceramic bracket debonding instrument with conventional pliers.
- To test the hypothesis that no difference exists in bracket failure modes between the two debonding methods.
Main Methods:
- Thirty maxillary premolars were divided into two groups for bracket debonding.
- Group 1 used conventional pliers, while Group 2 used a new debonding instrument.
- Teeth and brackets were examined for fracture and residual adhesive under magnification.
Main Results:
- A statistically significant difference in bond failure patterns was observed (p = .013).
- The new instrument resulted in a greater tendency for adhesive removal from the tooth.
- Bracket fracture incidence was lower when using the new debonding instrument.
Conclusions:
- The null hypothesis was rejected, indicating a difference in bracket failure characteristics.
- The new debonding instrument decreased bracket fracture incidence.
- Enamel damage incidence was similar between the conventional pliers and the new instrument groups.