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Apical root displacement is a critical risk factor for apical root resorption after orthodontic treatment

 Kyoung-Won Kim  ;  Sung-Jin Kim  ;  Ji-Yeon Lee  ;  Yoon-Jeong Choi  ;  Chooryung J. Chung  ;  Hyunsun Lim  ;  Kyung-Ho Kim 
 Angle Orthodontist, Vol.88(6) : 740-747, 2018 
Journal Title
 Angle Orthodontist 
Issue Date
Apical root displacement ; Apical root resorption ; Mathematical calculation ; Mixed-effects model ; Orthodontic treatment
OBJECTIVES: To identify risk factors for apical root resorption (ARR) of maxillary and mandibular incisors using mathematical quantification of apical root displacement (ARD) and multiple linear mixed-effects modeling. MATERIALS AND METHODS: Periapical radiographs of maxillary and mandibular incisors and lateral cephalograms of 135 adults were taken before and after orthodontic treatment. ARR was measured on the periapical radiographs, and movement of central incisors was evaluated on the superimposed pre- and posttreatment lateral cephalograms. ARD was mathematically calculated from pretreatment tooth length, inclination change, and movement of the incisal edge. Linear mixed-effects model analysis was performed to identify risk factors for ARR, and standardized coefficients (SCs) were calculated to investigate the relative contribution of the risk factors to ARR. RESULTS: Vertical ARD showed the highest SCs for both maxillary and mandibular incisors. Horizontal ARD showed the second highest SC for mandibular incisors but was not significantly correlated with the ARR of maxillary incisors. When horizontal and vertical ARDs were included in the mixed-effects model, the use of self-ligating brackets was significantly correlated with increased ARR of mandibular incisors. CONCLUSIONS: ARD is a critical factor for ARR after orthodontic treatment. Careful monitoring of ARR is recommended for patients requiring significant ARD of incisors.
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1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실)
1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실)
Yonsei Authors
김경호(Kim, Kyung Ho) ORCID logo https://orcid.org/0000-0002-8154-2041
김성진(Kim, Sung Jin) ORCID logo https://orcid.org/0000-0003-4115-0403
정주령(Chung, Chooryung J.) ORCID logo https://orcid.org/0000-0001-9399-7193
최윤정(Choi, Yoon Jeong) ORCID logo https://orcid.org/0000-0003-0781-8836
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