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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 December 17, 2020

Copyright © The Korean Association of Orthodontists.

Quantitative cone-beam computed tomography evaluation of hard tissue and soft tissue thickness of midpalatal suture area for location of orthodontic mini-implants

Song-Hee Oha*, Sae Rom Leeb*, Jin-Young Choic, Seong-Hun Kimd, Eui-Hwan Hwange, Gerald Nelsonf

aClinical Assistant Professor, bPostgraduate Student, eProfessor, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea. cPhD Student, dProfessor and Head, fClinical Adjunct Professor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.

Correspondence to:Seong-Hun Kim D.M.D., M.S.D., Ph.D.
Professor and Head, Department of Orthodontics, Graduate School, Kyung Hee University #1 Hoegi-dong, Dongdaemun-gu, Seoul 30-701, Republic of Korea
Telephone: 82-2-958-9392
E-mail address: bravortho@gmail.com

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

Objectives: To identify the most favorable sites that optimize the initial stability and survival rate of orthodontic mini-implants by evaluating the hard and soft tissues thickness of the median and paramedian area of the palate and possible sex- or age-related differences.
Materials and methods: The sample consisted of cone beam computed tomography(CBCT) from 189 healthy subjects, aged 7 to 87 years (81 males, 108 females). The sample was divided into four groups in terms of age. To measure the hard and soft tissues thickness of the palate, a grid area was set. Vertical lines were set at intervals of 0, 1.5, and 3.0 mm lateral to the midpalatal suture, and horizontal lines were set up to 24 mm at 2 mm intervals to the posterior margin of incisive foramen. The measurements were made at 65 points where the two lines intersect.
Results: The hard tissue thickness of the palatal bone decreases from the anterior to posterior and from a medial to lateral direction. While the soft tissue thickness was rather thick around the lateral aspects of the palatal arch, it otherwise formed a constant layer of only 1-2 mm throughout the palate. There were statistically significant differences by sex and age groups.
Conclusions: The anterior-lateral palate as well as the mid-palatal suture seem to be recommended as the most favorable site for insertion of mini-implants. The thickness of palatal bone was found to be age and sex-specific, thus age and sex-related differences should be considered.

Keywords: CBCT, midpalatal suture, thickness, mini-implant

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Korean J Orthod

Published online December 17, 2020

Copyright © The Korean Association of Orthodontists.

Quantitative cone-beam computed tomography evaluation of hard tissue and soft tissue thickness of midpalatal suture area for location of orthodontic mini-implants

Song-Hee Oha*, Sae Rom Leeb*, Jin-Young Choic, Seong-Hun Kimd, Eui-Hwan Hwange, Gerald Nelsonf

aClinical Assistant Professor, bPostgraduate Student, eProfessor, Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea. cPhD Student, dProfessor and Head, fClinical Adjunct Professor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.

Correspondence to:Seong-Hun Kim D.M.D., M.S.D., Ph.D.
Professor and Head, Department of Orthodontics, Graduate School, Kyung Hee University #1 Hoegi-dong, Dongdaemun-gu, Seoul 30-701, Republic of Korea
Telephone: 82-2-958-9392
E-mail address: bravortho@gmail.com

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

Objectives: To identify the most favorable sites that optimize the initial stability and survival rate of orthodontic mini-implants by evaluating the hard and soft tissues thickness of the median and paramedian area of the palate and possible sex- or age-related differences.
Materials and methods: The sample consisted of cone beam computed tomography(CBCT) from 189 healthy subjects, aged 7 to 87 years (81 males, 108 females). The sample was divided into four groups in terms of age. To measure the hard and soft tissues thickness of the palate, a grid area was set. Vertical lines were set at intervals of 0, 1.5, and 3.0 mm lateral to the midpalatal suture, and horizontal lines were set up to 24 mm at 2 mm intervals to the posterior margin of incisive foramen. The measurements were made at 65 points where the two lines intersect.
Results: The hard tissue thickness of the palatal bone decreases from the anterior to posterior and from a medial to lateral direction. While the soft tissue thickness was rather thick around the lateral aspects of the palatal arch, it otherwise formed a constant layer of only 1-2 mm throughout the palate. There were statistically significant differences by sex and age groups.
Conclusions: The anterior-lateral palate as well as the mid-palatal suture seem to be recommended as the most favorable site for insertion of mini-implants. The thickness of palatal bone was found to be age and sex-specific, thus age and sex-related differences should be considered.

Keywords: CBCT, midpalatal suture, thickness, mini-implant