Root Resorption Mechanisms in Orthodontic Treatment
Summary
Orthodontically induced root resorption arises when mechanical forces applied to teeth provoke a cascade of cellular and molecular events within the periodontal ligament and adjacent hard tissues. Compression of the periodontal ligament leads to hyalinisation and focal necrosis, which in turn recruit osteoclast-like cells that resorb not only alveolar bone but also cementum and the outer dentine of the root apex. The balance between force magnitude, duration and individual susceptibility determines the extent of root shortening, which ranges from clinically insignificant facets to more severe apical truncations. Contemporary imaging with cone-beam computed tomography provides three-dimensional assessment of root length and volume changes, revealing patterns of resorption that correlate with force direction, tooth morphology and treatment modality. Innovations in force application—such as light continuous loads and aligner systems—seek to minimise inflammatory mediators and limit hyalinised zones, thereby preserving root integrity. Understanding the interplay between biomechanical stress, inflammatory signalling and cellular resorptive activity is essential for optimising orthodontic protocols, reducing adverse outcomes and guiding personalised treatment planning.
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Root Resorption Mechanisms in Orthodontic Treatment publication trend
The graph below shows the total number of articles in root resorption mechanisms in orthodontic treatment across all publications each year (not limited to Nature Index journals).
Technical terms
Orthodontically induced inflammatory root resorption (OIIRR): Loss of root structure caused by an inflammatory response to orthodontic force application.
Hyalinisation: Formation of necrotic, glass-like tissue in compressed periodontal ligament regions preceding resorptive activity.
Periodontal ligament (PDL): Fibrous connective tissue anchoring the tooth root to alveolar bone and transmitting orthodontic forces.
Cone-beam computed tomography (CBCT): Three-dimensional imaging modality providing accurate measurement of root length and volume changes.
Finite element analysis (FEA): Computational method that models stress, strain and displacement in teeth and supporting structures under simulated loads.
References
- Prevalence and severity of apical root resorption during orthodontic treatment with clear aligners and fixed appliances: a cone beam computed tomography study. Progress in Orthodontics (2020).
- The Role of Bone and Root Resorption on the Biomechanical Behavior of Mandibular Anterior Teeth Subjected to Orthodontic Forces: A Finite Element Approach. Biomedicines (2024).
- Evaluation of root resorption after comprehensive orthodontic treatment using cone beam computed tomography (CBCT): a meta-analysis. BMC Oral Health (2018).
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