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Effect of debonding forces on bonded orthodontic brackets: finite element study
G Lewis1, S Manickam, D Wharton
1Department of Biomedical Engineering, The University of Memphis, TN 38152, USA.
Bio-Medical Materials and Engineering
|January 1, 1996
Summary
Finite element analysis quantified stress in orthodontic bracket adhesives. Understanding stress distribution aids in developing standardized protocols for testing bond strength, improving clinical outcomes.
Area of Science:
- Biomaterials Science
- Orthodontics
- Mechanical Engineering
Background:
- Secure bonding of orthodontic brackets is crucial for effective treatment.
- Adhesive bond strength is a critical factor in bracket retention and debonding.
- Understanding stress distribution within the adhesive layer is essential for optimizing bracket design and adhesive selection.
Purpose of the Study:
- To investigate the von Mises equivalent stress (SEQV) within the adhesive layer of orthodontic brackets using finite element analysis.
- To evaluate the sensitivity of SEQV to various parameters including bracket configuration, bracket material, debonding force, and adhesive type.
- To assess the utility of these findings in establishing a standard protocol for experimentally determining the bond strength of orthodontic adhesives.
Main Methods:
- Two-dimensional finite element analysis (FEA) models of bonded orthodontic brackets were developed.
- 39 distinct model cases were analyzed, varying bracket configurations, bracket materials, debonding forces, and adhesives.
- Values of von Mises equivalent stress (SEQV) were calculated at selected locations within the adhesive layer for each model.
Main Results:
- The study successfully obtained SEQV values for various orthodontic bracket models under different conditions.
- Results demonstrated the sensitivity of SEQV to changes in bracket configuration, material, applied force, and adhesive properties.
- Quantitative data on stress distribution was generated for each of the 39 analyzed scenarios.
Conclusions:
- The finite element analysis provides valuable insights into stress distribution within orthodontic bracket adhesives.
- The findings highlight the influence of multiple parameters on adhesive stress, informing material selection and design.
- The generated data can contribute to the development of standardized experimental protocols for assessing orthodontic adhesive bond strength.