Evaluate the Changes in Root Length of the Lower Anterior Teeth after Intrusion with Clear Aligners

Objective: To evaluate the effects on root length and root resorption of the lower anterior teeth after intrusion with clear aligners in adults with deep overbite, using three-dimensional imaging via cone-beam computed tomography (CBCT). Methods: From January 2019 to December 2023, twenty adult patients treated at the orthodontics department with clear aligners designed specifically for the intrusion of the lower anterior teeth were selected for this study. CBCT scans were taken before and after treatment to measure changes in the root length of the lower anterior teeth, and the data were analyzed statistically. Results: The change in root length of the mandibular central incisors, lateral incisors, and canines was statistically significant (P<0.01) in all cases. Conclusion: 1.After the use of clear aligners for the intrusion of the lower anterior teeth, a reduction in root length of the lower anterior teeth was observed (P<0.01). 2.The root absorption of the mandibular canines is more than that of the lower central incisor and lateral incisor.