Change of the airway space in mandibular prognathism after bimaxillary surgery involving maxillary posterior impaction

Bacground/Aim. Recently, maxillary and bimaxillary surgery gained the primacy in the surgical correction of class III deformities. The aim of this investigation was to compare the changes in the skeletal relationships in patients with mandibular prognathism after bimaxillary surgery. Methods. The study included 70 subjects divided into three groups. Twenty class III patients of the experimental group 1 underwent bilateral sagittal ramus osteotomy and twenty patients of the experimental group 2 were subjected to bimaxillary surgery. The control group consisted of 30 subjects with skeletal class I and physiological occlusion. Cephalometric research was conducted on 110 lateral cephalometric radiographs made in subjects of the experimental groups 1 and 2 before and after surgery and in subjects of the control group. Using the computer program ?Dr. Ceph?, 30 linear and angular skeletal variables were analyzed on each radiograph. Results. Bimaxillary osteotomies changed most of variables that characterize the mandibular prognathism. The changes in the sagittal plane included the significant increase of sella-nasion to the A point (SNA) angle (by 4? on the average) and the A point to B point (ANB) angle (6?), and significant reduction in angles sellanasion to the B point (SNB) (3?), gonial angle (ArGoMe) (8?), gonial angle inferior (NGoMe) (6.2?), and Bj?rks sum (7?). The vertical relationships were normalized by significant reduction in overall anterior face height N-Me (by 5 mm on the average), the lower anterior face height ANS-Me (4 mm), significant increase in the total posterior face height S-Go (2.5?3 mm), lower posterior face height PNS-Go (4 mm), and significant reduction of the basal and mandibular plane angles. Conclusion. Compared to the isolated mandibular operations, bimaxillary surgery changes more efficiently the sagittal and vertical skeletal relations in patients with class III deformities and harmonizes more successfully the entire skeletal facial profile.

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Head posture and pharyngeal airway volume changes after bimaxillary surgery for mandibular prognathism

Journal of Cranio-Maxillofacial Surgery ◽

10.1016/j.jcms.2013.07.022 ◽

2014 ◽

Vol 42 (5) ◽

pp. 531-535 ◽

Cited By ~ 21

Author(s):

Min-Ah Kim ◽

Bo-Ram Kim ◽

Jong-Kuk Youn ◽

Yoon-Ji R. Kim ◽

Yang-Ho Park

Keyword(s):

Volume Changes ◽

Mandibular Prognathism ◽

Head Posture ◽

Pharyngeal Airway ◽

Bimaxillary Surgery

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Three-dimensional changes of the hyoid bone and airway volumes related to its relationship with horizontal anatomic planes after bimaxillary surgery in skeletal Class III patients

The Angle Orthodontist ◽

10.2319/083112-700.1 ◽

2013 ◽

Vol 83 (4) ◽

pp. 623-629 ◽

Cited By ~ 24

Author(s):

Min-Ah Kim ◽

Bo-Ram Kim ◽

Jin-Young Choi ◽

Jong-Kuk Youn ◽

Yoon-Ji R. Kim ◽

...

Keyword(s):

Hyoid Bone ◽

Three Dimensional ◽

Class Iii ◽

Mandibular Prognathism ◽

Skeletal Class ◽

Dimensional Changes ◽

Pharyngeal Airway ◽

Posterior Maxilla ◽

Computed Tomography Scans ◽

Bimaxillary Surgery

ABSTRACT Objective: To evaluate longitudinal changes of the hyoid bone position and pharyngeal airway space after bimaxillary surgery in mandibular prognathism patients. Materials and Methods: Cone-beam computed tomography scans were taken for 25 mandibular prognathism patients before surgery (T0), 2 months after surgery (T1), and 6 months after surgery (T2). The positional displacement of the hyoid bone was assessed using the coordinates at T0, T1, and T2. Additionally, the volume of each subject's pharyngeal airway was measured. Results: The mean amount of posterior maxilla impaction was 3.76 ± 1.33 mm as the palatal plane rotated 2.04° ± 2.28° in a clockwise direction as a result of bimaxillary surgery. The hyoid bone moved backward (P < .05, P < .001) and downward (P > .05, P < .05) at 2 months and 6 months after surgery, while the total volume of the pharyngeal airway significantly decreased at the same time points (P < .001, P < .001). There was significant relationship between the changes of the hyoid bone position and airway volume at 2 months after surgery (P < .05). The change of the palatal plane angle was positively correlated to the decrease in the total airway volume (P < .001). Conclusions: The null hypothesis was rejected. The hyoid bone moved inferoposteriorly, and the pharyngeal airway volume decreased for up to 6 months after bimaxillary surgery. The decrease in the pharyngeal airway volume was correlated to the changes in the palatal plane inclination and the positional change of the hyoid bone.

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Facial profile and frontal changes after bimaxillary surgery in patients with mandibular prognathism

Journal of the Formosan Medical Association ◽

10.1016/j.jfma.2017.08.009 ◽

2018 ◽

Vol 117 (7) ◽

pp. 632-639 ◽

Cited By ~ 4

Author(s):

Chun-Ming Chen ◽

Michael Yuan-Chien Chen ◽

Jung-Hsuan Cheng ◽

Kwei-Jing Chen ◽

Yu-Chuan Tseng

Keyword(s):

Facial Profile ◽

Mandibular Prognathism ◽

Bimaxillary Surgery

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Radiographic cephalometry analysis of condylar position after bimaxillary osteotomy in patients with mandibular prognathism

Vojnosanitetski pregled ◽

10.2298/vsp141210051m ◽

2016 ◽

Vol 73 (4) ◽

pp. 318-325 ◽

Cited By ~ 1

Author(s):

Nikola Mikovic ◽

Milos Lazarevic ◽

Zoran Tatic ◽

Sanja Krejovic-Trivic ◽

Milan Petrovic ◽

...

Keyword(s):

Temporomandibular Disorders ◽

Orthognathic Surgery ◽

Orthodontic Treatment ◽

Upward Movement ◽

Treatment Results ◽

Mandibular Prognathism ◽

Distal Point ◽

Significant Difference ◽

Condylar Position ◽

Bimaxillary Surgery

Background/Aim. Postoperative condylar position is a substantial concern in surgical correction of mandibular prognathism. Orthognathic surgery may change condylar position and this is considered a contributing factor for early skeletal relapse and the induction of temporomandibular disorders. The purpose of this study was to evaluate changes in condylar position, and to correlate angular skeletal measurements following bimaxillary surgery. Methods. On profile teleradiographs of 21 patients with mandibular angular and linear parametres, the changes in condylar position, were measured during preoperative orthodontic treatment and 6 months after the surgical treatment. Results. A statistically significant difference in values between the groups was found. The most distal point on the head of condyle point (DI) moved backward for 1.38 mm (p = 0.02), and the point of center of collum mandibulae point (DC) moved backward for 1.52 mm (p = 0.007). The amount of upward movement of the point DI was 1.62 mm (p = 0.04). Conclusion. In the patients with mandibular prognathism, the condyles tend to migrate upward and forward six months after bimaxillary surgery.

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