Computerized tomographic evaluation of effects of mandibular anterior repositioning on the upper airway: a pilot study

Öḡütcen-Toller, Melahat; Saraç, Y. Şinasi; Çakır-Özkan, Nilüfer; Saraç, Duygu; Sakan, Banu Bağlan

doi:10.1016/j.prosdent.2004.05.003

Cited by 15 publications

(10 citation statements)

References 31 publications

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“…Previous literatures reported obvious dimensional changes in the oropharynx following mandibular advancement treatment [1], [11], [13], suggesting that the patency of the oropharynx was attributed to a forward repositioning of the tongue and soft palate with the mandibular advancement. In the present study, the hyoid bone showed a consistent forward movement with the mandible relative to the C 3 level, indicating that the hyoid bone might be a contributing factor to the oropharynx enlargement.…”

Section: Discussionmentioning

confidence: 92%

“…Besides, oropharyngeal shape turned more elliptical than control group, indicating that the main effect of the TB appliance was on the oropharynx. Therefore, TB appliance may improve the treatment for airway obstruction, which mostly occurred in the oropharynx [3], [24].…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies indicated that TB is effective in mandibular forward repositioning and thereby achieves a more harmonious facial profile [8], [9]. The upper airway changes in adult patients with OSA were measured after mandibular repositioning treatment, and showed a significant enlargement in pharyngeal volume [10], [11]. However, Lin et al [12] evaluated the pharyngeal airway after mandibular advancement in growing patients with retrognathia, and suggested that the anteroposterior dimension of pharyngeal airway did not change significantly.…”

Section: Introductionmentioning

confidence: 99%

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CBCT Evaluation of the Upper Airway Morphological Changes in Growing Patients of Class II Division 1 Malocclusion with Mandibular Retrusion Using Twin Block Appliance: A Comparative Research

Liu

Cheng

et al. 2014

PLoS ONE

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ObjectiveThe purpose of this study was to evaluate the morphological changes of upper airway after Twin Block (TB) treatment in growing patients with Class II division 1 malocclusion and mandibular retrusion compared with untreated Class II patients by cone beam computed tomography (CBCT).Materials and MethodsThirty growing patients who have completed TB treatment were recruited into TB group. The control group (n = 30) was selected from the patients with the same diagnosis and without TB treatment. CBCT scans of the pre-treatment (T1) and post-treatment (T2) data of TB group and control data were collected. After three-dimensional (3D) reconstruction and registration of T1 and T2 data, the morphological changes of upper airway during TB treatment were measured. The statistical differences between T1 and T2 data of TB group as well as T2 and control data were accessed by t-test.ResultsDuring the TB treatment, the mandible moved advanced by 3.52±2.14 mm in the horizontal direction and 3.77±2.10 mm in the vertical direction. The hyoid bone was in a more forward and inferior place. The upper airway showed a significant enlargement in nasopharynx, oropharynx and hypopharynx. In addition, the nasopharynx turned more circular, and the oropharynx became more elliptic in transverse shape. However, the transverse shape of the hypopharynx showed no significant difference. After comparison between T2 and control data, only the horizontal movement of the hyoid bone, the volumetric expansion of the oropharynx and hypopharynx, and changes of the oropharyngeal transverse shape showed significant difference.ConclusionCompared to the untreated Class II patients, the upper airway of growing patients with Class II division 1 malocclusion and mandibular retrusion showed a significant enlargement in the oropharynx and hypopharynx as well as a more elliptic transverse shape in the oropharynx, and the hyoid bone moved to an anterior position after TB treatment.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CBCT Evaluation of the Upper Airway Morphological Changes in Growing Patients of Class II Division 1 Malocclusion with Mandibular Retrusion Using Twin Block Appliance: A Comparative Research

Liu

Cheng

et al. 2014

PLoS ONE

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“…Such appliances are used for adults with obstructive sleep apnea to prevent upper airway collapse during sleep. 10 However, conflicting data exist regarding the long-term effects of functional appliances on oropharyngeal volume, airway dimensions, and hyoid bone position in growing patients, which may be due to the difficulties in assessing these variables with 2-D analyses. 11 The aim of the present study was to evaluate changes in hyoid bone position, oropharyngeal volume, and dimensions in the transverse and sagittal planes after treatment of skeletal Class II patients with functional appliances followed by edgewise treatment.…”

Section: Introductionmentioning

confidence: 99%

Changes in the oropharyngeal airway of Class II patients treated with the mandibular anterior repositioning appliance

Rizk¹,

Kulbersh

Al-Qawasmi

2015

The Angle Orthodontist

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Objective: To evaluate the effects of functional appliance treatment on the oropharyngeal airway volume, airway dimensions, and anteroposterior hyoid bone position of growing Class II patients. Materials and Methods: Twenty Class II white patients (mean age, 11.7 6 1.75 years) treated with the MARA followed by fixed appliances were matched to an untreated control sample by cervical vertebrae maturation stage at pretreatment (T1) and posttreatment (T2) time points. Cone beam computed tomography scans were taken at T1 and T2. Dolphin3D imaging software was used to determine oropharyngeal airway volume, dimensions, and anteroposterior hyoid bone position. Results: Multivariate ANOVA was used to evaluate changes between T1 and T2. Oropharyngeal airway volume, airway dimensions, and A-P position of the hyoid bone increased significantly with functional appliance treatment. SNA and ANB decreased significantly in the experimental group (P # .05). Changes in SNB and Sn-GoGn failed to reach statistical significance. Conclusions: Functional appliance therapy increases oropharyngeal airway volume, airway dimensions, and anteroposterior hyoid bone position in growing patients. (Angle Orthod. 2016;86:955-961.)

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“…These findings are in accordance with previous studies done on pharyngeal airway assessment. Ogutcen-Toller et al 20 conducted an experiment looking at changes in the airway in 15 snoring subjects. They made a customized acrylic block for each subject that advanced each mandible 3 mm less than maximum protrusion.…”

Section: Discussionmentioning

confidence: 99%

Computed Tomographic Evaluation of Three-dimensional Changes in Pharyngeal Airway in Class II Division 1 Patients treated with Twin Block Appliance

Temani

Jain

Chaudhary³

et al. 2014

J Indian Orthod Soc

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Objective: Recent years have witnessed a renewed interest to determine a quantifiable relationship between mandibular advancement performed with an orthodontic appliance and the resulting airway dimensions and volume. The study was conducted to evaluate the changes in dimensions of pharyngeal airway space using computed tomography (CT) in Class II division 1 patients with retrognathic mandible treated by twin block appliance and to compare them with untreated controls. Materials and methods: Twenty-five patients with Class II division 1 malocclusion of age group 9 to 15 years were selected randomly and evaluated for changes in pharyngeal airway dimensions with and without twin block. Patients in each group underwent CT scan of head and neck region at pretreatment stage and 6 months after the initial scan. Institutional approval for the project was obtained from the ethical committee. Volume, area, transverse and anterioposterior (AP) dimensions of upper (oropharynx) and lower (hypopharynx) pharyngeal airways were measured on scanogram using computer software and intragroup as well as intergroup comparisons were done. Results: There was a statistically significant increase in the volume of both hypopharynx and oropharynx in patients treated with twin block. Area, transverse and AP dimensions of oropharynx also increased significantly. In hypopharynx, area and transverse dimensions increased markedly but no increase in AP dimension was observed. Three-dimensional (3D) reconstruction of the airway also demonstrates a considerable increase in pharyngeal airway space. Conclusion: Twin block can be a promising appliance for improving pharyngeal airway space in Class II division 1 patients with retrognathic mandible. However, the long-term implications of this treatment modality needs further consideration and a longer period of follow-up.

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Computerized tomographic evaluation of effects of mandibular anterior repositioning on the upper airway: a pilot study

Cited by 15 publications

References 31 publications

CBCT Evaluation of the Upper Airway Morphological Changes in Growing Patients of Class II Division 1 Malocclusion with Mandibular Retrusion Using Twin Block Appliance: A Comparative Research

CBCT Evaluation of the Upper Airway Morphological Changes in Growing Patients of Class II Division 1 Malocclusion with Mandibular Retrusion Using Twin Block Appliance: A Comparative Research

Changes in the oropharyngeal airway of Class II patients treated with the mandibular anterior repositioning appliance

Computed Tomographic Evaluation of Three-dimensional Changes in Pharyngeal Airway in Class II Division 1 Patients treated with Twin Block Appliance

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