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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod

Published online March 12, 2021

Copyright © The Korean Association of Orthodontists.

Root proximity of the anchoring miniscrews of orthodontic miniplates on mandibular incisal area: Cone beam computed tomography analysis

Do-Min Jeonga*, Song Hee Ohb*, HyeRan Chooc, Yong-Suk Choid, Seong-Hun Kime, Jin-Suk Leef, Eui-Hwan Hwangg

aPhD Student, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.
bClinical Assistant Professor, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.
cClinical Assistant Professor, Department of Plastic Surgery Stanford University School of Medicine, Lucile Packard Children’s Hospital, Palo Alto, CA, USA.
dProfessor and Head, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.
eProfessor and Head, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
fPhD Student, Department of Dental Education, Graduate School, Kyung Hee University, Seoul, Korea.
gProfessor, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.

Correspondence to:Eui-Hwan Hwang D.M.D., M.S.D., Ph.D.
Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, #1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
Telephone: 82-2-958-9405
E-mail address: hehan@khu.ac.kr

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: This outcome analysis study is to evaluate the actual position of orthodontic miniplate, miniplate anchoring screws, and risk factors on adjacent anatomic structures after placement at the mandibular incisal area. Methods: Cone-beam computed tomographic images were reviewed retrospectively to examine 97-orthodontic mini-plates and their 194- mini-plate anchoring screws (MPAS; diameter,1.5mm; length,4mm) on the subjects whose miniplates provided sufficient clinical stability for orthodontic treatment. For evaluating the actual positions of mini plates and analysis risk factors including effects on the adjacent roots, MPAS-placement height(PH), placement depth(PD), plate angle(PA), mental fossa angle(MA) and root proximity(RP) were assessed by using the paired t-test, ANOVA, and generalized linear model and regression analyses. Results: The mean PD of MPAS at the position1(P1) and the position2(P2) were 2.01mm and 2.23mm, respectively. PA was significantly higher in the classIII malocclusion group. PH showed a positive correlation with MA and PD at P1. 49 out of 97MPAS at P1 were in the no-root area and the rest were in the dentulous area. All MPAS at P2 were in the no-root area. Nineteen out of 97MPAS at P1 showed a degree of root contact (19.6%) without root perforation. Conclusions: Positioning the head of miniplate approximately 1mm lower than mucogingival junction is highly likely to give sufficient PH for the P1-MPAS to be placed at the no-root area. The results of the study suggest safe placement of an orthodontic-mini-plate at the mandibular anterior region to ensure predictability of its use during the orthodontic treatment.

Keywords: CT, Miniplate, Anchorage, Orthodontic treatment

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Korean J Orthod

Published online March 12, 2021

Copyright © The Korean Association of Orthodontists.

Root proximity of the anchoring miniscrews of orthodontic miniplates on mandibular incisal area: Cone beam computed tomography analysis

Do-Min Jeonga*, Song Hee Ohb*, HyeRan Chooc, Yong-Suk Choid, Seong-Hun Kime, Jin-Suk Leef, Eui-Hwan Hwangg

aPhD Student, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.
bClinical Assistant Professor, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.
cClinical Assistant Professor, Department of Plastic Surgery Stanford University School of Medicine, Lucile Packard Children’s Hospital, Palo Alto, CA, USA.
dProfessor and Head, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.
eProfessor and Head, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
fPhD Student, Department of Dental Education, Graduate School, Kyung Hee University, Seoul, Korea.
gProfessor, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea.

Correspondence to:Eui-Hwan Hwang D.M.D., M.S.D., Ph.D.
Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, #1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
Telephone: 82-2-958-9405
E-mail address: hehan@khu.ac.kr

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: This outcome analysis study is to evaluate the actual position of orthodontic miniplate, miniplate anchoring screws, and risk factors on adjacent anatomic structures after placement at the mandibular incisal area. Methods: Cone-beam computed tomographic images were reviewed retrospectively to examine 97-orthodontic mini-plates and their 194- mini-plate anchoring screws (MPAS; diameter,1.5mm; length,4mm) on the subjects whose miniplates provided sufficient clinical stability for orthodontic treatment. For evaluating the actual positions of mini plates and analysis risk factors including effects on the adjacent roots, MPAS-placement height(PH), placement depth(PD), plate angle(PA), mental fossa angle(MA) and root proximity(RP) were assessed by using the paired t-test, ANOVA, and generalized linear model and regression analyses. Results: The mean PD of MPAS at the position1(P1) and the position2(P2) were 2.01mm and 2.23mm, respectively. PA was significantly higher in the classIII malocclusion group. PH showed a positive correlation with MA and PD at P1. 49 out of 97MPAS at P1 were in the no-root area and the rest were in the dentulous area. All MPAS at P2 were in the no-root area. Nineteen out of 97MPAS at P1 showed a degree of root contact (19.6%) without root perforation. Conclusions: Positioning the head of miniplate approximately 1mm lower than mucogingival junction is highly likely to give sufficient PH for the P1-MPAS to be placed at the no-root area. The results of the study suggest safe placement of an orthodontic-mini-plate at the mandibular anterior region to ensure predictability of its use during the orthodontic treatment.

Keywords: CT, Miniplate, Anchorage, Orthodontic treatment