Pharyngeal Airway Space and Hyoid Bone Positioning After Different Orthognathic Surgeries in Skeletal Class II Patients

2017 ◽  
Vol 75 (7) ◽  
pp. 1482-1490 ◽  
Author(s):  
Chunmiao Jiang ◽  
Yating Yi ◽  
Chunxiao Jiang ◽  
Shanbao Fang ◽  
Jun Wang
Keyword(s):  
Hyoid Bone ◽  
Class Ii ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii

scholarly journals Effect of occlusal plane control procedure on hyoid bone position and pharyngeal airway of hyperdivergent skeletal Class II patients

2016 ◽  
Vol 87 (2) ◽  
pp. 293-299
Author(s):  
Xiaolong Li ◽  
Qing Zhao ◽  
Rui Zhao ◽  
Meiya Gao ◽  
Xiaolei Gao ◽  
...  
Keyword(s):  
Hyoid Bone ◽  
Class Ii ◽  
Occlusal Plane ◽  
Control Procedure ◽  
Skeletal Class ◽  
Counterclockwise Rotation ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii ◽  
Mandibular Plane ◽  
Lateral Cephalograms

ABSTRACT Objective: To evaluate the effect of occlusal plane control on the hyoid bone position and pharyngeal airway of hyperdivergent skeletal Class II patients during orthodontic treatment. Materials and Methods: Cephalograms of 47 hyperdivergent skeletal Class II subjects with occlusal plane control (OPC), and another 50 subjects without occlusal plane control (NOPC) were selected to compare the effects of the occlusal plane control procedure. Lateral cephalograms before treatment (T1), immediately after treatment (T2), and an average of 12 months after treatment (T3) were obtained, and 17 measurements were analyzed in each group and compared between groups. Results: With respect to the T2−T1 changes, the sagittal discrepancies in both groups were alleviated. In the OPC group, both the occlusal and mandibular plane angles decreased, accompanied by anterior and superior movement and counterclockwise rotation of the hyoid bone. The overall changes from T3 to T1 in each group exhibited trends similar to that induced by treatment. As for pharyngeal airway space alterations, no significant difference in OPC group was presented throughout treatment or retention periods. Conclusions: The customized occlusal plane control procedure was effective for hyperdivergent skeletal Class II patients: The occlusal plane rotated counterclockwise, followed by a counterclockwise rotation of the mandibular plane. The hyoid bone moved anteriorly and superiorly, accompanied by its counterclockwise rotation. However, this procedure did not induce significant alteration of the pharyngeal airway space.

scholarly journals Characterization of the pharyngeal airway in skeletal class II patients in relation to the skeletal facial pattern

2016 ◽  
Vol 4 (4) ◽  
pp. e225-e231
Author(s):  
Dolores A Gómez Fernández ◽  
Rafael Rivas Gutiérrez ◽  
Enrique Sierra Rosales ◽  
Rogelio Díaz Peña
Keyword(s):  
Class Ii ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii ◽  
Facial Pattern

scholarly journals Evaluation of the position and morphology of tongue and hyoid bone in skeletal Class II malocclusion based on cone beam computed tomography

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Wener Chen ◽  
HungEn Mou ◽  
Yufen Qian ◽  
Liwen Qian
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Hyoid Bone ◽  
Class Ii ◽  
Growth Patterns ◽  
Class I ◽  
Cone Beam ◽  
Skeletal Class ◽  
Skeletal Class Ii ◽  
Average Angle

Abstract Background The aim of the study was to analyze the morphology and position of the tongue and hyoid bone in skeletal Class II patients with different vertical growth patterns by cone beam computed tomography in comparison to skeletal Class I patients. Methods Ninety subjects with malocclusion were divided into skeletal Class II and Class I groups by ANB angles. Based on different vertical growth patterns, subjects in each group were divided into 3 subgroups: high-angle group (MP-FH ≥ 32.0°), average-angle group (22.0° ≤ MP-FH < 32°) and low-angle group (MP-FH < 22°). The position and morphology of the tongue and hyoid bone were evaluated in the cone beam computed tomography images. The independent Student’s t‐test was used to compare the position and morphology of the tongue and hyoid bone between skeletal Class I and Class II groups. One-way analysis of variance (ANOVA) was used to compare the measurement indexes of different vertical facial patterns in each group. Results Patients in skeletal Class II group had lower tongue posture, and the tongue body was smaller than that of those in the Class I group (P < 0.05). The position of the hyoid bone was lower in the skeletal Class II group than in Class I group (P < 0.05). The tongue length and H-Me in the skeletal Class I group with a low angle were significantly larger than those with an average angle and high angle (P < 0.05). There was no significant difference in the position or morphology of the tongue and hyoid bone in the skeletal Class II group with different vertical facial patterns (P > 0.05). Conclusion Patients with skeletal Class II malocclusion have lower tongue posture, a smaller tongue body, and greater occurrence of posterior inferior hyoid bone position than skeletal Class I patients. The length of the mandibular body in skeletal Class I patients with a horizontal growth type is longer. The position and morphology of the tongue and hyoid bone were not greatly affected by vertical facial development in skeletal Class II patients.

scholarly journals Twin block appliance: Effect on pharyngeal airway

2018 ◽  
Vol 7 (4) ◽  
pp. 147-152
Author(s):  
Vivek Bikram Thapa ◽  
Amrita Shrestha ◽  
Prabesh Sherchan ◽  
Prakash Poudel ◽  
Luna Joshi
Keyword(s):  
Soft Palate ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Twin Block ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii ◽  
Obstructive Sleep ◽  
Lateral Cephalograms ◽  
Mandibular Retrusion

Background: Mandibular retrusion is the main cause of Skeletal Class II malocclusion characterized by skeletal retrusion of mandible with skeletal or dentoalveolar protrusion of maxillary. Objectives: This study was conducted to evaluate effect of treatment with twin-block appliances on pharyngeal dimensions. Methodology: This study was conducted in in the Department of Orthodontics & Dentofacial Orthopedics in Kathmandu Medical College. Twenty patients of age group 7 to 14 years with skeletal class II malocclusion with mandibular retrusion were selected. Variables evaluated were depth of nasopharynx; height of nasopharynx; depth of oropharynx; depth of hypopharynx; soft palate length; soft palate thickness and soft palate inclination. The lateral cephalograms were obtained for all subjects before the start of treatment and after a follow-up period of approximately three months in treatment. Results: Results showed that depth of nasopharynx increased by 1 mm, height of nasopharynx increased by 0.78 mm, depth of nasopharynx increased by 1.97 mm, depth of hypopharynx increased by 0.79 mm, soft palate length decreased by 4 mm, soft palate thickness increased by 2 mm and soft palate inclination decreased by 7.01 mm. The results for depth of pharynx and soft palate thickness were statistically significant. Conclusion: This study concluded that the use of twin block appliance for class II patients corrects sagittal dimension of oropharynx and hypopharynx. Early intervention for mandibular retrognathism in class II malocclusion helps enlarge the airway dimensions and decrease potential risk of obstructive sleep apnea syndrome for growing patients in the future.

scholarly journals Cone-beam evaluation of pharyngeal airway space in adult skeletal Class II patients with different condylar positions

2018 ◽  
Vol 89 (2) ◽  
pp. 312-316
Author(s):  
Jintao Xu ◽  
Ruonan Sun ◽  
Linna Wang ◽  
Xiaoying Hu
Keyword(s):  
Null Hypothesis ◽  
Three Dimensional ◽  
Class Ii ◽  
Cone Beam ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii ◽  
Posterior Group ◽  
Significant Difference ◽  
Anterior Group

ABSTRACT Objectives: To test the null hypothesis that there is no significant difference in pharyngeal airway space among adult skeletal Class II patients with different condylar positions using cone-beam computed tomography (CBCT). Materials and Methods: The CBCT records of 60 patients with skeletal Class II malocclusion (ANB angle ≥ 4°, Wits ≥ 0) were selected from the CBCT database. According to the condyle position, the patients were divided in three groups: anterior group (CD ≤ −12%), centric group (−12% ≤ CD ≤ +12%), and posterior group (CD ≥ +12%). Three-dimensional (3D) pharyngeal airway models were reconstructed using InvivoDental software 5.1.3. The volume and area of the pharyngeal airway space were measured in the 3D airway model. Results: The volume and area of the pharyngeal airway space in the centric group were significantly smaller than those in the posterior group (P &lt; .01). The volume and area of the pharyngeal airway space were smallest in the anterior group and significantly increased in the centric and posterior groups (P &lt; .001). Conclusions: The null hypothesis was rejected. Significant differences were noted in pharyngeal airway space among adult skeletal Class II patients with different condylar positions.

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