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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   

Copyright © The Korean Association of Orthodontists.

Skeletal and Dento-alveolar Effects Using Different Types of Microimplant-assisted Rapid Palatal Expansion (MARPE)

Hyeong-Yoon Choi, Sang-Min Lee*, Jin-Woo Lee, Dong-Hwa Chung, Mo-Hyeon Lee

Department of Orthodontics, College of Dentistry, Dankook University, Cheonan 330714, Korea; ltl8787@naver.com (H.-Y.C.); jwlee1945@hanmail.com (J.-W.L.); abeh@dankook.ac.kr (D.-H.C.); dignityoflmh@naver.com (M.-H. L.)

Correspondence to:leesm0624@dankook.ac.kr

Abstract

Objective: To evaluate the following null hypothesis: there is no difference in the coronal and axial expansion patterns in skeletal and dentoalveolar measurements using two different types of microimplant-assisted rapid palatal expansion (MARPE) Methods: Pretreatment (T0) and post- MARPE (T1) cone-beam computed tomography (CBCT) images of 32 patients (14 men and 18 women; mean age, 19.37) were analyzed. We compared two different types of MARPEs. The first type of MARPEs include maxillary first premolars, maxillary first molars, and four microimplants as anchors (U46 type, n=16) and the other include only maxillary first molars and microimplants as anchors (U6 type, n=16). Results: In the molar region of the U6 type, the amount of midnasal, basal, alveolar, and dental level transverse expansion was 2.64 mm, 3.52 mm, 4.46 mm, and 6.32 mm, respectively. whereas in the U46 type, 2.17 mm, 2.56 mm, 2.73 mm, and 5.71 mm were acquired, respectively. A significant difference was found in the posterior alveolar level expansion (P_alv), (p = 0.036) and posterior basal bone level expansion (P_basal), (p=0.043) between groups, showing a greater posterior skeletal and alveolar expansion in the U6 type. Conclusions: The U6 type showed a greater amount of posterior expansion at the alveolar and basal bone level, showing an almost parallel split compared with the U46 type. Both types of MARPE showed a pyramidal pattern of expansion in coronal view.

Keywords: microimplant-assisted rapid palatal expansion, maxillary transverse discrepancy, cone-beam computed tomography, bicortical engagement

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Korean J Orthod   

First Published Date May 19, 2023

Copyright © The Korean Association of Orthodontists.

Skeletal and Dento-alveolar Effects Using Different Types of Microimplant-assisted Rapid Palatal Expansion (MARPE)

Hyeong-Yoon Choi, Sang-Min Lee*, Jin-Woo Lee, Dong-Hwa Chung, Mo-Hyeon Lee

Department of Orthodontics, College of Dentistry, Dankook University, Cheonan 330714, Korea; ltl8787@naver.com (H.-Y.C.); jwlee1945@hanmail.com (J.-W.L.); abeh@dankook.ac.kr (D.-H.C.); dignityoflmh@naver.com (M.-H. L.)

Correspondence to:leesm0624@dankook.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: To evaluate the following null hypothesis: there is no difference in the coronal and axial expansion patterns in skeletal and dentoalveolar measurements using two different types of microimplant-assisted rapid palatal expansion (MARPE) Methods: Pretreatment (T0) and post- MARPE (T1) cone-beam computed tomography (CBCT) images of 32 patients (14 men and 18 women; mean age, 19.37) were analyzed. We compared two different types of MARPEs. The first type of MARPEs include maxillary first premolars, maxillary first molars, and four microimplants as anchors (U46 type, n=16) and the other include only maxillary first molars and microimplants as anchors (U6 type, n=16). Results: In the molar region of the U6 type, the amount of midnasal, basal, alveolar, and dental level transverse expansion was 2.64 mm, 3.52 mm, 4.46 mm, and 6.32 mm, respectively. whereas in the U46 type, 2.17 mm, 2.56 mm, 2.73 mm, and 5.71 mm were acquired, respectively. A significant difference was found in the posterior alveolar level expansion (P_alv), (p = 0.036) and posterior basal bone level expansion (P_basal), (p=0.043) between groups, showing a greater posterior skeletal and alveolar expansion in the U6 type. Conclusions: The U6 type showed a greater amount of posterior expansion at the alveolar and basal bone level, showing an almost parallel split compared with the U46 type. Both types of MARPE showed a pyramidal pattern of expansion in coronal view.

Keywords: microimplant-assisted rapid palatal expansion, maxillary transverse discrepancy, cone-beam computed tomography, bicortical engagement