Canine stress analysis of two clear aligner attachment designs: A finite element study

A finite element analysis compared the stress distribution profiles of a single rectangular attachment against a dual semicircular configuration to resolve the biomechanical intricacies of achieving bodily canine translation with clear aligners. Hence, three-dimensional model of the maxilla was generated to simulate stress propagation across the teeth, periodontal ligament and alveolar bone under standardized loading conditions. Von mises stress assessment revealed that the rectangular geometry induced markedly higher stress concentrations (0.1922 MPa), suggesting an elevated risk of root resorption and appliance fatigue. Conversely, the dual semicircular design exhibited enhanced biomechanical efficiency, demonstrating a 27% reduction in stress magnitude (0.1411 MPa) and minimized localized pressure. These data advance clinical understanding by establishing dual semicircular attachments as a safer, more effective modality for predictable canine movement.