Cephalometric evaluation of hyoid bone position in subjects with different vertical dental patterns

2021 ◽  
Vol 24 (3) ◽  
pp. 321
Author(s):  
OA Soyoye ◽  
OD Otuyemi ◽  
M Newman-Nartey
Keyword(s):  
Hyoid Bone ◽  
Dental Patterns

scholarly journals Orthodontic Treatment and Craniocervical Posture in Patients with Temporomandibular Disorders: An Observational Study

2021 ◽  
Vol 18 (6) ◽  
pp. 3295
Author(s):  
Maria Paço ◽  
José Alberto Duarte ◽  
Teresa Pinho
Keyword(s):  
Temporomandibular Disorders ◽  
Orthodontic Treatment ◽  
Hyoid Bone ◽  
Craniofacial Morphology ◽  
P Value ◽  
Skeletal Class ◽  
Treatment Data ◽  
Phase Data ◽  
Condylar Displacement ◽  
Clinical Records

Orthodontic treatment acts through the application of forces and/or by stimulating and redirecting the functional forces within the craniofacial complex. Considering the interrelationship between craniomandibular and craniocervical systems, this intervention may alter craniocervical posture. Thus, our aim is to (a) compare craniocervical posture, hyoid bone position, and craniofacial morphology before, after, and also in the contention phase at least one year after the orthodontic treatment, in patients with temporomandibular disorders and (b) to verify whether the presence of condylar displacement, the skeletal class, or the facial biotype interferes with the abovementioned outcomes. To do so an observational, analytical, longitudinal, and retrospective design study was carried out. A non-probabilistic convenience sampling method was applied. The sample consisted of clinical records of patients diagnosed with temporomandibular disorders in order to compare pre-orthodontic treatment with post-orthodontic treatment (n = 42) and contention phase data (n = 26). A cephalometric analysis of several variables was performed. The p-value was set as 0.05. When the pre- and post-orthodontic treatment data were analyzed, there were statistically significant changes in variables concerning craniocervical posture (CV angle, C0-C1, and AA-PNS) and also concerning hyoid bone position (C3-Rgn). When pre- and post-orthodontic treatment and contention phase data were analyzed the variables concerning craniocervical posture (C0-C1, CVT/Ver, NSL/OPT, NSL/CVT, NSL/Ver; OPT/CVT, OPT/Ver) and facial biotype had statistically significant changes. This allowed us to conclude that in the sample studied, there were significant differences regarding hyoid bone position (pre- versus post-orthodontic treatment) and craniocervical posture (pre- versus post-orthodontic versus contention), with the craniocervical posture being prone to return to basal values. The presence of condylar displacement was found to significantly increase the H-H1 distance in the three moments of evaluation. Facial biotype was found to significantly increase the NSL/Ver angle on hypodivergent compared to hyperdivergent in the contention phase.

scholarly journals A complex fracture of the hyoid bone and the larynx after a bicycle accident - case report and review of literature

2021 ◽  
pp. 105922
Author(s):  
Lava Taha ◽  
Matti Sievert ◽  
Felix Eisenhut ◽  
Heinrich Iro ◽  
Maximilian Traxdorf ◽  
...  
Keyword(s):  
Case Report ◽  
Hyoid Bone ◽  
Review Of Literature ◽  
Bicycle Accident ◽  
Complex Fracture ◽  
Accident Case

scholarly journals Developmental features and predicting airway failure risk in critically ill children with mandibular hypoplasia using 3D computational tomographic analysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Doo-Hwan Kim ◽  
Eunseo Gwon ◽  
Junheok Ock ◽  
Jong-Woo Choi ◽  
Jee Ho Lee ◽  
...  
Keyword(s):  
Risk Factors ◽  
Difficult Airway ◽  
Hyoid Bone ◽  
Three Dimensional ◽  
Upper Airway ◽  
Critically Ill Children ◽  
Healthy Controls ◽  
Mandibular Hypoplasia ◽  
Tongue Position ◽  
Developmental Features

AbstractIn children with mandibular hypoplasia, airway management is challenging. However, detailed cephalometric assessment data for this population are sparse. The aim of this study was to find risk factors for predicting difficult airways in children with mandibular hypoplasia, and compare upper airway anatomical differences using three-dimensional computed tomography (3D CT) between children with mandibular hypoplasia and demographically matched healthy controls. There were significant discrepancies in relative tongue position (P < 0.01) and anterior distance of the hyoid bone (P < 0.01) between patients with mandibular hypoplasia and healthy controls. All mandibular measures were significantly different between the two groups, except for the height of the ramus of the mandible. After adjusting for age and sex, the anterior distance of hyoid bone and inferior pogonial angle were significantly associated with a difficult airway (P = 0.01 and P = 0.02). Quantitative analysis of upper airway structures revealed significant discrepancies, including relative tongue position, hyoid distance, and mandible measures between patients with mandibular hypoplasia and healthy controls. The anterior distance of the hyoid bone and inferior pogonial angle may be risk factors for a difficult airway in patients with mandibular hypoplasia.

Hyoid Bone Syndrome With Sympathetic Symptoms

2021 ◽  
Author(s):  
Rongfei Wang ◽  
Huijuan Yuan ◽  
Zhao Dong
Keyword(s):  
Hyoid Bone

A neuromuscular mechanism maintaining extrathoracic airway patency

1979 ◽  
Vol 46 (4) ◽  
pp. 772-779 ◽  
Author(s):  
R. T. Brouillette ◽  
B. T. Thach
Keyword(s):  
Negative Pressure ◽  
Hyoid Bone ◽  
Electromyographic Activity ◽  
Depth Of Anesthesia ◽  
Blood Gas ◽  
Nerve Section ◽  
Airway Patency ◽  
Airway Occlusion ◽  
Extrathoracic Airway ◽  
Closing Pressure

The ability of the extrathoracic airway (ETA) to remain open when exposed to negative pressure was investigated in rabbits. Postmortem, the ETA collapsed at -6.3 +/- 0.6 cmH2O whereas, during airway occlusion maneuvers in lightly anesthetized animals, it remained patent at pressures as low as -80 cmH2O. This discrepancy suggested that a neuromuscular mechanism maintains ETA patency. Four findings indicated that the genioglossus and geniohyoid muscles, which pull the tongue and hyoid bone anteriorly, help maintain ETA patency: 1) anterior movement of the hyoid bone increased the negative pressure at which the ETA collapsed postmortem, 2) ETA closure during occluded inspirations occurred after 12th nerve section abolished electromyographic activity in these muscles and 3) after deep anesthesia depressed such activity, and 4) closing pressure was linearly related to peak integrated electromyograms of the two muscles. After 12th nerve section, ETA closing pressure became more negative with progressive asphyxia greatly exceeding postmortem closing pressure, which suggests that other muscles also help maintain ETA patency. Blood gas tensions, respiratory system mechanoreceptors, and depth of anesthesia appear to influence genioglossus and geniohyoid activity.

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