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http://dx.doi.org/10.4041/kjod.2011.41.3.174

Factors affecting orthodontically induced root resorption of maxillary central incisors in the Korean population  

Chung, Dong-Hwa (Department of Orthodontics, School of Dentistry, Dankook University)
Park, Young-Guk (Department of Orthodontics, School of Dentistry, Kyunghee University)
Kim, Kwang-Won (Private Practice, Okims Dental Office)
Cha, Kyung-Suk (Department of Orthodontics, School of Dentistry, Dankook University)
Publication Information
The korean journal of orthodontics / v.41, no.3, 2011 , pp. 174-183 More about this Journal
Abstract
Objective: Orthodontically induced root resorption (OIRR) involves partial loss of cementum and dentin of teeth caused by routine orthodontic treatment. It decreases root length and influences the function of affected teeth. In this study, the treatment and patient factors causing apical root resorption in Koreans were determined. The observed factors were extraction, gender, age, displacement of root apex, total treatment period, total teeth length, and shape of the root. Methods: The records of 137 patients treated with full, fixed edgewise appliances were obtained from the Department of Orthodontics, Dankook University Dental Hospital, from November 2007 to December 2008. Periapical radiographs of the maxillary central incisors and cephalometric radiographs of each patient were used to assess apical root resorption and type of tooth movement. Results: The mean amount of resorption was $1.62{\pm}1.58mm$. The amount of resorption in the extraction and non-extraction groups was $2.10{\pm}1.64mm$ and $1.18{\pm}1.39mm$, respectively. The amount of root resorption increased with the total tooth length. Severe root resorption (> 4 mm) was related to abnormal root shape (blunt, pointed, or eroded). Conclusions: The variables significantly related to OIRR were extraction, initial tooth length, and root shape.
Keywords
Root resorption; Extraction; Root shape;
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