The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Root proximity of the anchoring miniscrews of orthodontic miniplates in the mandibular incisal area: Cone-beam computed tomographic analysis

  • Jeong, Do-Min (Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University) ;
  • Oh, Song Hee (Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University) ;
  • Choo, HyeRan (Department of Surgery, Division of Plastic and Reconstructive Surgery, Craniofacial and Airway Orthodontic Clinic, Stanford University School of Medicine, Lucile Packard Children's Hospital) ;
  • Choi, Yong-Suk (Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University) ;
  • Kim, Seong-Hun (Department of Orthodontics, Graduate School, Kyung Hee University) ;
  • Lee, Jin-Suk (Department of Dental Education, Graduate School, Kyung Hee University) ;
  • Hwang, Eui-Hwan (Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University)
  • Received : 2020.11.10
  • Accepted : 2021.03.12
  • Published : 2021.07.25
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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.

Keywords

Acknowledgement

This article is partly from the PhD thesis of D.M.J.

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