[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
Main Menu
Home::
Journal Information::
About the Journal
Editorial Board
Aims& Scopes
Journal News
publication ethics::
Abstracting and Indexing::
Articles archive::
All Issues
Current Issue
For Authors::
Call for Papers
Submission Instruction
Submission Form
For Reviewers::
Reviewers Section
Registration::
Registration Information
Registration Form
Contact us::
Contact Information
Contact us
::
Search in website

Advanced Search
..
Receive site information
Enter your Email in the following box to receive the site news and information.
..

Citation Indices from GS

AllSince 2020
Citations1010
h-index11
i10-index00
..
:: Volume 3, Issue 3 (9-2025) ::
cofs 2025, 3(3): 39-47 Back to browse issues page
Evaluation of the airway, soft tissue, and hyoid bone position changes following premolar-extraction orthodontic treatment in Class I malocclusion
Parnian Tadayonnezhad , Mehdi Rafiei * , Azadeh Torkzadeh , Ali Tabrizi
Department of Orthodontics, Faculty of Dentistry, Isf.c, Islamic Azad University, Isfahan, Iran
Abstract:   (199 Views)
Background: The soft tissue profile plays a significant role in the appearance of patient and treatment satisfaction, while the airway affects breathing patterns. This study aimed to investigate the impact of premolar extraction on soft tissue profile, airway dimension, and position of the hyoid bone in Class 1 patients.
Materials & Methods: This retrospective analytical study analyzed pre- and post-treatment lateral cephalograms of 27 Class I patients aged 18 to 30 years, referred to Isfahan Islamic Azad University. Each patient received fixed orthodontic treatment that involved the extraction of all four first premolars. The cephalograms were captured in natural head position with the head centered between the X-ray source and the film, both before and after treatment, and traced manually. To assess soft tissue profile, E-line, UL-E line, LL-E line, U1-L1, FCA, ILA, MLA, and HNB were evaluated. For airway and hyoid bone position, S-H, H-RGN, VAL, U-MPW, TB-TPPW, and V-LPW were assessed. Data were analyzed by Paired t-test and Pearson correlation coefficients (α= 0.05).
Results: The values of LL-E line (p=0.006), UL-E line (p=0.001), and the HNB angle (p=0.049) significantly decreased after treatment. Other soft tissue variables showed no significant differences(p>0.05). The airway variables did not show significant differences; however, S-H, which relates to the hyoid bone, showed a significant decrease (p=0.038).
Conclusion: Treatment of Class I patients with first premolar extraction did not change the airway but resulted in the hyoid bone being positioned more superiorly. This treatment also retracted both lips and reduced facial convexity.

 
Full-Text [PDF 492 kb]   (60 Downloads)    
Type of Study: Research | Subject: Oral Medicine
Received: 2025/09/16 | Accepted: 2025/09/11 | Published: 2025/09/11
References
1. Atik E, Görücü Coşkuner H, Taner T. Comparison of Orthodontic Treatment with Different Premolar Extraction Modalities in Terms of Soft Tissue Profile. Cumhuriyet Dent J 2019;22:4 [DOI:10.7126/cumudj.587443]
2. Drake L, Vogel W, Mitchell AWM, Gray H. Gray's anatomy for students. 40th ed. Philadelphia: Elsevier, 2020.P: 180-295.
3. Perry JL. Anatomy and physiology of the velopharyngeal mechanism. Semin Speech Lang. 2011;32(2):83-92. [DOI:10.1055/s-0031-1277712]
4. Sheng CM, Lin LH, Su Y, Tsai HH. Developmental changes in pharyngeal airway depth and hyoid bone position from childhood to young adulthood. Angle Orthod. 2009;79(3):484-490.. [DOI:10.2319/062308-328.1]
5. Jiang YY. Correlation between hyoid bone position and airway dimensions in Chinese adolescents by cone beam computed tomography analysis. Int J Oral Maxillofac Surg. 2016;45(7):914-921. [DOI:10.1016/j.ijom.2016.02.005]
6. Hwang DM, Lee JY, Choi YJ, Hwang CJ. Evaluations of the tongue and hyoid bone positions and pharyngeal airway dimensions after maxillary protraction treatment. Cranio. 2019;37(4):214-222. [DOI:10.1080/08869634.2017.1418644]
7. Korkmaz YN DDS, Buyuk SK DDS, PhD, Genç E DDS. Comparison of hyoid bone positions and pharyngeal airway dimensions in different body mass index percentile adolescent subjects. Cranio. 2020;38(5):286-291. [DOI:10.1080/08869634.2018.1543828]
8. Patini R, Arrica M, Di Stasio E, Gallenzi P, Cordaro M. The use of magnetic resonance imaging in the evaluation of upper airway structures in paediatric obstructive sleep apnoea syndrome: a systematic review and meta-analysis. Dentomaxillofac Radiol. 2016;45(7):20160136 [DOI:10.1259/dmfr.20160136]
9. Nasser A, Alshammari R, Al-Jewair T, Aldosari MA, Sahar A. Post-orthodontic Pharyngeal Airway Changes Following First Premolar Extraction and Incisor Retraction in Bimaxillary Protrusion Patients-A Retrospective Study. J Res Med Dent Sci, 2019;7(5):29-38.
10. Almurtadha RH, Alhammadi MS, Fayed MMS, Abou-El-Ezz A, Halboub E. Changes in Soft Tissue Profile After Orthodontic Treatment With and Without Extraction: A Systematic Review and Meta-analysis. J Evid Based Dent Pract. 2018;18(3):193-202. [DOI:10.1016/j.jebdp.2017.09.002]
11. Khan M, Fida M. Soft tissue profile response in extraction versus non-extraction orthodontic treatment. J Coll Physicians Surg Pak. 2010;20(7):454-459.
12. Chopra S, Bansal P, Bansal P. Essix Appliance: An Innovation Modification for use as Temporary Bridge- A Case Report. J Adv Med Dent Scie Res 2020;8(1): 184-186
13. Maurya MRK, Kumar CP, Sharma LCM, Nehra LCK, Singh H, Chaudhari PK. Cephalometric appraisal of the effects of orthodontic treatment on total airway dimensions in adolescents. J Oral Biol Craniofac Res. 2019;9(1):51-56. [DOI:10.1016/j.jobcr.2018.09.004]
14. Al Maaitah E, El Said N, Abu Alhaija ES. First premolar extraction effects on upper airway dimension in bimaxillary proclination patients. Angle Orthod. 2012;82(5):853-859. [DOI:10.2319/101711-646.1]
15. Soheilifar S, Soheilifar S, Ataei H, Mollabashi V, Amini P, Bakhshaei A, et al. Extraction versus non-extraction orthodontic treatment: Soft tissue profile changes in borderline class I patients. Dent Med Probl. 2020;57(3):275-283. [DOI:10.17219/dmp/119102]
16. Freitas BV, Rodrigues VP, Rodrigues MF, de Melo HVF, Dos Santos PCF. Soft tissue facial profile changes after orthodontic treatment with or without tooth extractions in Class I malocclusion patients: A comparative study. J Oral Biol Craniofac Res. 2019;9(2):172-176 [DOI:10.1016/j.jobcr.2018.07.003]
Add your comments about this article
Your username or Email:

CAPTCHA

XML     Print

Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
Tadayonnezhad P, Rafiei M, Torkzadeh A, Tabrizi A. Evaluation of the airway, soft tissue, and hyoid bone position changes following premolar-extraction orthodontic treatment in Class I malocclusion. cofs 2025; 3 (3) :39-47
URL: http://cofs.khuisf.ac.ir/article-1-108-en.html
Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 3, Issue 3 (9-2025) Back to browse issues page
Contemporary Orofacial Science Contemporary Orofacial Science
Persian site map - English site map - Created in 0.06 seconds with 39 queries by YEKTAWEB 4722