Biomechanical characteristics of root resorption during orthodontic treatment / 中国组织工程研究

ABSTRACT

BACKGROUND: Root resorption is the treatment of malocclusion deformity correction in a common adverse reaction, and associated factors can be divided into biological and mechanical factors.OBJECTIVE: To explore the biological and mechanical factors of the root resorption caused by orthodontic treatment, so as to reduce the treatment risks.METHODS: With key words "root resorption, biomechanics", a computer-based online search of PubMed database (1990-01/2009-05) and CNKI database (1990-01/2009-05) was performed for articles published in English and Chinese. Root resorption in Levander & Malmgren rating system was used as the evaluation index. The orthodontic treatment-related content was included, and other aspects of research were excluded.RESULTS AND CONCLUSION: A total of 72 articles were collected, and according to inclusion and exclusion criteria, 31 were included for analysis. Root resorption is a common phenomenon associated with orthodontic treatment, The factors relevant to root resorption can be divided into biological and mechanical factors, which are associated with an increased or decreased risk of root resorption during orthodontic treatment. Orthodontic therapy of patients with increased risk of root resorption should be carefully planned. Medical history, medication intake, family history, tooth and root morphology, oral health and habits must be considerate. The standard procedure to monitor apical root resorption is a radiographic examination after 6 months of treatment. In teeth with enhanced risk, a 3-month radiographic follow-up is recommended. The use of anti-inflammatory drugs might suppress root resorption induced by orthodontic therapy, although no study is conclusive enough to indicate a protocol for patients with enhanced dsk. In the event of multiple external root resorption, the diagnostic procedure should focus on the exclusion of the local factors and its associations (such as magnitude, duration and type of orthodontic force, periodontal disease, root form) that might lead to external root resorption. Systemic disorders associated with phosphorus-calcium metabolic alterations are also suspected.Orthodontic treatment may cause a certain degree of root resorption, especially in patients with high-risk factors, but this risk can be minimized by the control of force and the close monitor of treatment process.