scholarly journals Three-Dimensional Evaluation of Pharyngeal Airway Volume Following Treatment of Post-Pubertal Patients with Skeletal Class II Malocclusion via Miniplate-Anchored Herbst Appliance

2020 ◽  
Vol 23 (4) ◽  
pp. 435-444
Author(s):  
khaled ElHabbak ◽  
Farouk Hussain ◽  
Al-Dany Al-Dany
Keyword(s):  
Three Dimensional ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Herbst Appliance ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii

scholarly journals Correlation Analysis between Three-Dimensional Changes in Pharyngeal Airway Space and Skeletal Changes in Patients with Skeletal Class II Malocclusion following Orthognathic Surgery

2022 ◽  
Vol 2022 ◽  
pp. 1-15
Author(s):  
Moonhwan Kim ◽  
Chung-Ju Hwang ◽  
Jung-Yul Cha ◽  
Sang-Hwy Lee ◽  
Young Joon Kim ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Three Dimensional ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Sectional Area ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Changes ◽  
Skeletal Class Ii ◽  
Anterior Posterior

Introduction. Studies on the pharyngeal airway space (PAS) changes using three-dimensional computed tomography (CT) have shed more light on patients with Class III than Class II malocclusion. This paper focuses on analyzing the long-term changes in the PAS and evaluating the postoperative association between these PAS and skeletal changes in patients with skeletal Class II malocclusion who have undergone orthognathic surgery. Methods. The records of 21 patients with skeletal Class II malocclusion who had undergone orthognathic surgery were included. The anatomical modifications in both jaws, changes in volume, sectional area (SA), minimum sectional area (MSA), and anterior-posterior (AP) and transverse (TV) width in the airway at one month before surgery ( T 0 ), and one month ( T 1 ) and one year ( T 2 ) after surgery were analyzed using CT images. The association between the skeletal and airway changes was evaluated between T 0 , T 1 , and T 2 . Results. After surgery, the ANS, A point, and PNS demonstrated significant posterior and superior movement. The B point and the pogonion exhibited substantial anterior and superior movement. The total and inferior oropharyngeal volumes (vol 3, vol 4) notably increased, while the nasopharyngeal volume (vol 1) decreased. The anterior-posterior movement at the ANS and PNS after surgery was significantly associated with the total volume, vol 2, vol 3, SA 1, MSA, and TV width 1, while substantial association with the total volume was found at the pogonion. Conclusion. Thus, an ideal treatment plan can be formulated for patients with skeletal Class II malocclusion by considering the postoperative PAS changes.

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 No Compliance Correction of Class II Malocclusion in Growing Patients Whit HERBST Appliance: A Case Report

2018 ◽  
Vol 12 (1) ◽  
pp. 605-613 ◽  
Author(s):  
M. Portelli ◽  
A. Militi ◽  
M. Cicciù ◽  
A. Lo Giudice ◽  
G. Cervino ◽  
...  
Keyword(s):  
Class Ii ◽  
Class I ◽  
Class Ii Malocclusion ◽  
Herbst Appliance ◽  
Functional Therapy ◽  
Deep Bite ◽  
Mandibular Growth ◽  
Skeletal Class ◽  
Skeletal Class Ii ◽  
Mandibular Retrusion

Background:Class II malocclusion is the most common sagittal skeletal discrepancy, with a prevalent skeletal pattern of mandibular retrusion. The correction of mandibular retrusion with functional removable appliance needs a good patient’s compliance; for this reason, some clinicians prefer to use no compliance apparatus.Objective:Objective of the present therapy note is to demonstrate that the use of no compliance apparatus can provide a good correction of skeletal class II malocclusion.Methods:In the present study, authors report a therapy note referred to a 10 years old patient, woman, affected by Class II, with mandibular retrusion and deep bite, treated in 2013 at the Dep. of Orthodontics of Messina University. An orthodontic treatment has been planned with the aim of stimulating mandibular growth; an Herbst appliance with a cantilever design, bonded on first maxillary and mandibular molars, has been used. After eleven months of functional therapy a bilateral molar class I have been obtained.Results:In the therapy note proposed, authors obtained a resolution of mandibular retrusion, a correction of overjet, overbite and dental crowding in both arches, and a bilateral molar and canine class I has been achieved.Conclusion:Herbst appliance seems to be efficient in the correction of II Class Malocclusion, independently from patient’s cooperation; moreover , early correction of Class II malocclusion with functional appliances produces several clinical advantages.

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 < .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 < .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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