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Korean J Orthod
First Published Date September 5, 2023
Copyright © The Korean Association of Orthodontists.
Ney Paredesa,b 
, Ausama Gargoumb, Ramon Dominguez-Mompellc, Ozge Colakd, Joseph Buib, Tam Duongb, Maya Giannettie, Fernanda Silvab, Kendra Brooksb, Won Moonf,g ,
aPrivate Practice, Houston, TX, USA
bCenter for Health Science, Section of Orthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
cDepartment of Orthodontics, Rey Juan Carlos University, Madrid, Spain
dDepartment of Orthodontics, State University of New York, Buffalo, NY, USA
eSection of Orthodontics, UCSF School of Dentistry, San Francisco, CA, USA
fOrthodontic and Craniofacial Development Research, Forsyth Institute, Cambridge, MA, USA
gDepartment of Orthodontics, Ajou University, School of Medicine, Suwon, Korea
Correspondence to:Won Moon.
Adjunct Professor, Department of Orthodontics, Ajou University, School of Medicine, 206 World cup-ro, Yeongtong-gu, Suwon 16499, Korea.
Tel +1-3108660814 e-mail themoonprinciples@gmail.com
How to cite this article: Paredes N, Gargoum A, Dominguez-Mompell R, Colak O, Bui J, Duong T, Giannetti M, Silva F, Brooks K, Moon W. Pattern of microimplant displacement during maxillary skeletal expander treatment: A cone-beam computed tomography study. Korean J Orthod. Published online September 5, 2023. https://doi.org/10.4041/kjod23.056
Objective: To analyze the microimplant (MI) displacement pattern on treatment with a maxillary skeletal expander (MSE) using cone-beam computed tomography (CBCT). Methods: Thirty-nine participants (12 males and 27 females; mean age, 18.2 ± 4.2 years) were treated successfully with the MSE II appliance. Their pre- and post-expansion CBCT data were superimposed. The pre- and post-expansion anterior and posterior inter-MI angles, neck and apical inter-MI distance, plate angle, palatal bone thickness at the MI positions, and suture opening at the MI positions were measured and compared. Results: The jackscrew plate was slightly bent in both anterior and posterior areas. There was no significant difference in the extent of suture opening between the anterior and posterior MIs (p > 0.05). The posterior MI to hemiplate line was greater than that anteriorly (p < 0.05). The apical distance between the posterior MIs was greater than that anteriorly (p < 0.05). The palatal thickness at the anterior MIs was significantly greater than that posteriorly (p > 0.01). Conclusions: In the coronal plane, the angulation between the anterior MIs in relation to the jackscrew plate was greater than that between the posterior MIs owing to the differential palatal bone thickness.
Keywords: Expansion, Microimplant-assisted rapid palatal expansion, Maxillary skeletal expander, Bone-anchored maxillary expander
Korean J Orthod
First Published Date September 5, 2023
Copyright © The Korean Association of Orthodontists.
Ney Paredesa,b , Ausama Gargoumb, Ramon Dominguez-Mompellc, Ozge Colakd, Joseph Buib, Tam Duongb, Maya Giannettie, Fernanda Silvab, Kendra Brooksb, Won Moonf,g ,
aPrivate Practice, Houston, TX, USA
bCenter for Health Science, Section of Orthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
cDepartment of Orthodontics, Rey Juan Carlos University, Madrid, Spain
dDepartment of Orthodontics, State University of New York, Buffalo, NY, USA
eSection of Orthodontics, UCSF School of Dentistry, San Francisco, CA, USA
fOrthodontic and Craniofacial Development Research, Forsyth Institute, Cambridge, MA, USA
gDepartment of Orthodontics, Ajou University, School of Medicine, Suwon, Korea
Correspondence to:Won Moon.
Adjunct Professor, Department of Orthodontics, Ajou University, School of Medicine, 206 World cup-ro, Yeongtong-gu, Suwon 16499, Korea.
Tel +1-3108660814 e-mail themoonprinciples@gmail.com
How to cite this article: Paredes N, Gargoum A, Dominguez-Mompell R, Colak O, Bui J, Duong T, Giannetti M, Silva F, Brooks K, Moon W. Pattern of microimplant displacement during maxillary skeletal expander treatment: A cone-beam computed tomography study. Korean J Orthod. Published online September 5, 2023. https://doi.org/10.4041/kjod23.056
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.
Objective: To analyze the microimplant (MI) displacement pattern on treatment with a maxillary skeletal expander (MSE) using cone-beam computed tomography (CBCT). Methods: Thirty-nine participants (12 males and 27 females; mean age, 18.2 ± 4.2 years) were treated successfully with the MSE II appliance. Their pre- and post-expansion CBCT data were superimposed. The pre- and post-expansion anterior and posterior inter-MI angles, neck and apical inter-MI distance, plate angle, palatal bone thickness at the MI positions, and suture opening at the MI positions were measured and compared. Results: The jackscrew plate was slightly bent in both anterior and posterior areas. There was no significant difference in the extent of suture opening between the anterior and posterior MIs (p > 0.05). The posterior MI to hemiplate line was greater than that anteriorly (p < 0.05). The apical distance between the posterior MIs was greater than that anteriorly (p < 0.05). The palatal thickness at the anterior MIs was significantly greater than that posteriorly (p > 0.01). Conclusions: In the coronal plane, the angulation between the anterior MIs in relation to the jackscrew plate was greater than that between the posterior MIs owing to the differential palatal bone thickness.
Keywords: Expansion, Microimplant-assisted rapid palatal expansion, Maxillary skeletal expander, Bone-anchored maxillary expander
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