Relationship between pharyngeal airway depth and ventilation condition in mandibular setback surgery: A computational fluid dynamics study

2020 ◽  
Vol 23 (3) ◽  
pp. 313-322 ◽  
Author(s):  
Yoshito Shirazawa ◽  
Tomonori Iwasaki ◽  
Kazuhiro Ooi ◽  
Yutaka Kobayashi ◽  
Ayaka Yanagisawa‐Minami ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Ventilation Condition ◽  
Mandibular Setback Surgery

scholarly journals Computational fluid dynamics for the assessment of upper airway changes in skeletal Class III patients treated with mandibular setback surgery

2016 ◽  
Vol 86 (6) ◽  
pp. 976-982 ◽  
Author(s):  
Darshit H. Shah ◽  
Ki Beom Kim ◽  
Mark W. McQuilling ◽  
Reza Movahed ◽  
Ankit H. Shah ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pressure Drop ◽  
Negative Correlation ◽  
Significant Negative Correlation ◽  
Class Iii ◽  
Time Points ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery

ABSTRACT Objective: To analyze and compare pharyngeal airflow characteristics pre- and post–mandibular setback surgery in patients with Class III skeletal dysplasia using cone beam computed tomography (CBCT) and computational fluid dynamics (CFD). Materials and Methods: Records of 29 patients who had received orthodontic treatment along with mandibular setback surgery were obtained. CBCT scans were obtained at three time points: T1 (before surgery), T2 (average of 6 months after surgery), and T3 (average of 1 year after surgery). Digitized pharyngeal airway models were generated from these scans. CFD was used to simulate and characterize pharyngeal airflow. Results: Mean airway volume was significantly reduced from 35,490.324 mm3 at T1 to 24,387.369 mm3 at T2 and 25,069.459 mm3 at T3. Significant increase in mean negative pressure was noted from 3.110 Pa at T1 to 6.116 Pa at T2 and 6.295 Pa at T3. There was a statistically significant negative correlation between the change in airway volume and the change in pressure drop at both the T2 and T3 time points. There was a statistically significant negative correlation between the amount of mandibular setback and change in pressure drop at the T2 time point. Conclusions: Following mandibular setback surgery, pharyngeal airway volume was decreased and relative mean negative pressure was increased, implying an increased effort required from a patient for maintaining constant pharyngeal airflow. Thus, high-risk patients undergoing a large amount of mandibular setback surgery should be evaluated for obstructive sleep apnea and the proposed treatment plan be revised based on the risk for potential airway compromise.

Evaluation of airway resistance and wall shear stress affected by mandibular setback surgery using computational fluid dynamics

2014 ◽  
Vol 72 (9) ◽  
pp. e127
Author(s):  
Y. Yajima ◽  
T. Iwai ◽  
H. Kitajima ◽  
Y. Ohara ◽  
K. Honda ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Airway Resistance ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery ◽  
Wall Shear

scholarly journals Effects of bodily retraction of mandibular incisors versus mandibular setback surgery on pharyngeal airway space: A comparative study

2017 ◽  
Vol 47 (6) ◽  
pp. 344 ◽  
Author(s):  
Byeong-Tak Keum ◽  
Sung-Hwan Choi ◽  
Yoon Jeong Choi ◽  
Hyoung-Seon Baik ◽  
Kee-Joon Lee
Keyword(s):  
Comparative Study ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery ◽  
Mandibular Incisors

Changes in the pharyngeal airway space and hyoid bone position after mandibular setback surgery for skeletal Class III jaw deformity in Japanese women

2010 ◽  
Vol 138 (6) ◽  
pp. 708.e1-708.e10 ◽  
Author(s):  
Toru Kitahara ◽  
Yoshihiro Hoshino ◽  
Kazuhiro Maruyama ◽  
Emiko In ◽  
Ichiro Takahashi
Keyword(s):  
Hyoid Bone ◽  
Japanese Women ◽  
Class Iii ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery ◽  
Jaw Deformity

scholarly journals Changes of Hyoid, Tongue and Pharyngeal Airway after Mandibular Setback Surgery by Intraoral Vertical Ramus Osteotomy

2010 ◽  
Vol 80 (2) ◽  
pp. 302-308 ◽  
Author(s):  
Soonshin Hwang ◽  
Chooryung Judi Chung ◽  
Yoon-Jeong Choi ◽  
Jong-Ki Huh ◽  
Kyung-Ho Kim
Keyword(s):  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Intraoral Vertical Ramus Osteotomy ◽  
Mandibular Setback Surgery ◽  
Vertical Ramus Osteotomy

Assessment of the pharyngeal airway space after mandibular setback surgery

2000 ◽  
Vol 58 (3) ◽  
pp. 282-285 ◽  
Author(s):  
Marat Tselnik ◽  
M.Anthony Pogrel
Keyword(s):  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery

scholarly journals Evaluation of the pharyngeal airway using computational fluid dynamics in patients with acromegaly

2018 ◽  
Vol 3 (2) ◽  
pp. 133-138 ◽  
Author(s):  
Keika Mukaihara ◽  
Maiko Hasegawa-Moriyama ◽  
Tomonori Iwasaki ◽  
Youichi Yamasaki ◽  
Yuichi Kanmura
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pharyngeal Airway

scholarly journals Noninvasive estimation of pharyngeal airway resistance and compliance in children based on volume-gated dynamic MRI and computational fluid dynamics

2011 ◽  
Vol 111 (6) ◽  
pp. 1819-1827 ◽  
Author(s):  
Steven C. Persak ◽  
Sanghun Sin ◽  
Joseph M. McDonough ◽  
Raanan Arens ◽  
David M. Wootton
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Rate ◽  
Magnetic Resonance Images ◽  
Cfd Modeling ◽  
Tidal Breathing ◽  
Upper Airways ◽  
Pharyngeal Airway ◽  
Airway Collapse ◽  
Obstructive Sleep

Computational fluid dynamics (CFD) analysis was used to model the effect of collapsing airway geometry on internal pressure and velocity in the pharyngeal airway of three sedated children with obstructive sleep apnea syndrome (OSAS) and three control subjects. Model geometry was reconstructed from volume-gated magnetic resonance images during normal tidal breathing at 10 increments of tidal volume through the respiratory cycle. Each geometry was meshed with an unstructured grid and solved using a low-Reynolds number k-ω turbulence model driven by flow data averaged over 12 consecutive breathing cycles. Combining gated imaging with CFD modeling created a dynamic three-dimensional view of airway anatomy and mechanics, including the evolution of airway collapse and flow resistance and estimates of the local effective compliance. The upper airways of subjects with OSAS were generally much more compliant during tidal breathing. Compliance curves (pressure vs. cross-section area), derived for different locations along the airway, quantified local differences along the pharynx and between OSAS subjects. In one subject, the distal oropharynx was more compliant than the nasopharynx (1.028 vs. 0.450 mm2/Pa) and had a lower theoretical limiting flow rate, confirming the distal oropharynx as the flow-limiting segment of the airway in this subject. Another subject had a more compliant nasopharynx (0.053 mm2/Pa) during inspiration and apparent stiffening of the distal oropharynx (C = 0.0058 mm2/Pa), and the theoretical limiting flow rate indicated the nasopharynx as the flow-limiting segment. This new method may help to differentiate anatomical and functional factors in airway collapse.

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