Upper Airway Changes Following Single-step or Stepwise Advancement Using the Functional Mandibular Advancer

Overview

Journal J Orofac Orthop

Specialty Dentistry

Date 2016 Oct 23

PMID 27770150

Citations 6

Authors

Isil Aras

Aylin Pasaoglu

Sultan Olmez

Idil Unal

Aynur Aras

Affiliations

Soon will be listed here.

Abstract

Objectives: Purpose of the present study was to determine and compare possible changes in the dimensions of the pharyngeal airway, morphology of the soft palate, and position of the tongue and hyoid bone after single-step or stepwise mandibular advancement using the Functional Mandibular Advancer (FMA).

Patients And Methods: The sample included 51 peak-pubertal Class II subjects. In all, 34 patients were allocated to two groups using matched randomization: a single-step mandibular advancement group (SSG) and a stepwise mandibular advancement group (SWG). Both groups were treated with FMA followed by fixed appliance therapy; the remaining 17 subjects who underwent only fixed appliance therapy constituted the control group (CG). The study was conducted using pre- and posttreatment lateral cephalometric radiographs. Data were analyzed by paired t test, one-way analysis of variance, and Pearson's correlation coefficient.

Result: In the SWG and SSG, although increases in nasopharyngeal airway dimensions were not significant compared with those in the CG, enlargements in the oropharyngeal airway dimensions at the level of the soft palate tip and behind the tongue, and decreases in soft palate angulation, were significant. Tongue height increased significantly only in the SWG. Compared with the CG, while forward movement of the hyoid was more prominent in SSG and SWG, the change in the vertical movement of the hyoid was not significant. No significant difference between SWG and SSG was observed in pharyngeal airway, soft palate, tongue or hyoid measurements.

Conclusions: The mode of mandibular advancement in FMA treatment did not significantly affect changes in the pharyngeal airway, soft palate, tongue, and hyoid bone.

Citing Articles

Effectiveness of Functional Mandibular Advancer in Patients with Class II Malocclusion: A Systematic Review and Meta-analysis.

Kumar M, Sathyanarayana H, Kailasam V Turk J Orthod. 2024; 36(4):270-279.

PMID: 38164015 PMC: 10763597. DOI: 10.4274/TurkJOrthod.2022.2022.110.

The effect of orthodontic vertical control on the changes in the upper airway size and tongue and hyoid position in adult patients with hyperdivergent skeletal class II.

Liu Y, Chen W, Wei Y, Zhang G, Zhang X, Sharhan H BMC Oral Health. 2022; 22(1):532.

PMID: 36424588 PMC: 9686087. DOI: 10.1186/s12903-022-02580-w.

Effect of fixed functional appliances on pharyngeal airway dimensions in Skeletal Class II individuals - A scoping review.

Ganesh G, Tripathi T J Oral Biol Craniofac Res. 2021; 11(4):511-523.

PMID: 34377659 PMC: 8327667. DOI: 10.1016/j.jobcr.2021.07.004.

Pharyngeal airway and hyoid bone position changes of skeletal anchored Forsus Fatigue Resistant Device and activator appliances.

Ince-Bingol S, Kaya B Clin Oral Investig. 2021; 25(8):4841-4850.

PMID: 33449194 DOI: 10.1007/s00784-021-03789-9.

Stepwise versus single-step mandibular advancement with functional appliance in treating class II patients : A meta-analysis.

Chen Z, Chen Q, Fan X, Li Y, Mo S J Orofac Orthop. 2020; 81(5):311-327.

PMID: 32415333 DOI: 10.1007/s00056-020-00229-3.

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