Description
Despite a relatively low force to deflection rate for initial archwires, the highest risk for external apical root resorption (EAAR) is during the first 6 months of treatment (initial alignment). Relative to biomechanics, the major risk factors for EARR are genetic predisposition, occlusal trauma, root flexure, PDL inflammation and cell necrosis.
Learning Objectives:
- Recognize the role of PDL necrosis in the biomechanics of applied loads.
- Analyze the relationship between occlusal trauma and root flexure.
- Compare the interactive biomechanics of PDL necrosis, occlusal trauma, and root flexure on the expression of root resorption.
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