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Failure analysis: enamel fracture after debonding orthodontic brackets.
Chen-Sheng Chen1, Ming-Lun Hsu, Kin-Di Chang
1School of Dentistry, National Yang-Ming University, Taipei, Taiwan.
The Angle Orthodontist
|October 25, 2008
Summary
Enamel fracture (EF) locations align with debonding forces (tensile, shear, torsion). Clinicians should carefully examine these areas post-bracket removal, as fracture size and incidence do not significantly differ across these force modes.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Mechanics
Background:
- Debonding orthodontic brackets can cause enamel fractures (EF).
- Understanding the location and size of EF is crucial for preventing further damage.
- Different debonding force modes may influence EF characteristics.
Purpose of the Study:
- To determine the location and size of enamel fractures (EF) during bracket debonding.
- To investigate the relationship between debonding load modes and EF characteristics.
- To explore the complex failure mechanisms of enamel during bracket removal.
Main Methods:
- Mechanical testing simulating tensile, shear, and torsion debonding.
- Finite Element Model (FEM) analysis to simulate stress distribution.
- Scanning Electron Microscopy (SEM) to examine fracture morphology.
Main Results:
- Enamel fractures typically occurred at the site of force application.
- Tensile, shear, and torsion debonding modes resulted in comparable EF sizes and incidences.
- FEM, mechanical testing, and SEM findings were consistent.
Conclusions:
- EF locations consistently corresponded to the exerted tensile, shear, or torsion forces.
- Dentists should pay close attention to force application areas after debonding.
- The choice of debonding force mode does not significantly impact EF size or incidence, simplifying clinical decisions.
