⁠Biomechanical Considerations in the Use of Temporary Anchorage Devices (TADs) in Complex Orthodontic Cases

Abstract

Temporary Anchorage Devices (TADs) have revolutionized orthodontic treatment by providing stable and minimally invasive anchorage, especially in complex cases requiring significant tooth movement without reciprocal effects. This study investigates the biomechanical factors influencing TAD success, focusing on insertion site, bone density, force vector orientation, and anatomical location. Clinical data from 45 orthodontic patients treated with TADs were analyzed alongside digital simulations using OrthoCAD to visualize force application and anchorage moments. Descriptive statistics revealed an average TAD success rate of 87.2%, with maxillary placements showing greater reliability than mandibular sites. Pearson correlation analysis indicated that bone density had the strongest association with treatment success (r = 0.55), followed by TAD positioning and insertion angle. Independent t-tests confirmed a significant difference in success rates between maxillary and mandibular TADs (p = 0.039), while chi-square tests established a significant link between failure and location (p = 0.033). Simulated case models supported these findings by demonstrating the biomechanical efficiency of well-aligned force vectors and anchorage moments. These results emphasize the importance of biomechanical planning and patient-specific anatomical considerations in optimizing TAD outcomes. The integration of clinical analysis and digital modeling offers valuable guidance for improving anchorage control in advanced orthodontic treatments.