An assessment of the magnitude, parallelism, and asymmetry of micro-implant-assisted rapid maxillary expansion in non-growing patients.

Autor: Elkenawy I; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA. kenawy.sam@gmail.com., Fijany L; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Colak O; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Paredes NA; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Gargoum A; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Abedini S; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Cantarella D; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Dominguez-Mompell R; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Sfogliano L; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA., Moon W; Division of Growth and Development, Section of Orthodontics, School of Dentistry, Center for Health Science, University of California at Los Angeles, Room 63-082 CHS, 10833 Le Conte Ave, Box 951668, Los Angeles, CA, 90095-1668, USA. themoonprinciples@gmail.com.
Jazyk: angličtina
Zdroj: Progress in orthodontics [Prog Orthod] 2020 Nov 23; Vol. 21 (1), pp. 42. Date of Electronic Publication: 2020 Nov 23.
DOI: 10.1186/s40510-020-00342-4
Abstrakt: Background and Objectives: Micro-implant-assisted expanders have shown significant effects on the mid-face, including a degree of asymmetry. The aim of this study is to quantify the magnitude, parallelism, and asymmetry of this type of expansion in non-growing patients.
Methods: A retrospective study on a sample of 31 non-growing patients with an average age of 20.4 years old, with cone beam computed tomography images taken before and right after expansion using maxillary skeletal expander (MSE) were assessed for skeletal expansion at three landmarks bilaterally.
Results: Average magnitude of total expansion was 4.98 mm at the anterior nasal spine (ANS) and 4.77 mm at the posterior nasal spine (PNS) which showed statistical significance using a paired t test with p < 0.01. Average expansion at the PNS was 95% of that at the ANS. The sample was divided into symmetric (n = 15) and asymmetric (n = 16) based on the difference in expansion at the ANS, with 16 out of 31 patients exhibiting statistically significant asymmetry.
Conclusions: MSE achieves distinctly parallel expansion in the sagittal plane but can exhibit asymmetrical expansion in the transverse plane.
Databáze: MEDLINE
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