Root proximity of the anchoring miniscrews of orthodontic miniplates in the mandibular incisal area: Cone-beam computed tomographic analysis
정도민, 오송희, 추혜란, 최용석, 김성훈, Lee Jin-Suk, 황의환,
소속 상세정보
정도민 ( Jeong Do-Min ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
오송희 ( Oh Song-Hee ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
추혜란 ( Choo Hye-Ran ) - Stanford University School of Medicine Department of Surgery
최용석 ( Choi Yong-Suk ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
김성훈 ( Kim Seong-Hun ) - Kyung Hee University Graduate School Department of Orthodontics
( Lee Jin-Suk ) - Kyung Hee University Graduate School Department of Dental Education
황의환 ( Hwang Eui-Hwan ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
Abstract
Objective: This outcome analysis study evaluated the actual positions of the orthodontic miniplate and miniplate anchoring screws (MPASs) and the risk factors affecting adjacent anatomic structures after miniplate placement in the mandibular incisal area.
Methods: Cone-beam computed tomographic images of 97 orthodontic miniplates and their 194 MPASs (diameter, 1.5 mm; length, 4 mm) in patients whose miniplates provided sufficient clinical stability for orthodontic treatment were retrospectively reviewed. For evaluating the actual positions of the miniplates and analyzing the risk factors, including the effects on adjacent roots, MPAS placement height (PH), placement depth (PD), plate angle (PA), mental fossa angle (MA), and root proximity were assessed using the paired t-test, analysis of variance, and generalized linear model and regression analyses.
Results: The mean PDs of MPASs at positions 1 (P1) and 2 (P2) were 2.01 mm and 2.23 mm, respectively. PA was significantly higher in the Class III malocclusion group than in the other groups. PH was positively correlated with MA and PD at P1. Of the 97 MPASs at P1, 49 were in the no-root area and 48 in the dentulous area; moreover, 19 showed a degree of root contact (19.6%) without root perforation. All MPASs at P2 were in the no-root area.
Conclusions: Positioning the miniplate head approximately 1 mm lower than the mucogingival junction is highly likely to provide sufficient PH for the P1- MPASs to be placed in the no-root area.
키워드
Cone-beam computed tomography; Miniplate; Anchorage; Orthodontic treatment
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