Ramal inclination in the frontal plane after bimaxillary orthognathic surgery in skeletal class III facial asymmetry

2021 ◽  
Author(s):  
Eun-Hye Park ◽  
Ae-Rim Ha ◽  
Kyung-A Kim ◽  
Ki-Ho Park ◽  
Yoon-Goo Kang
Keyword(s):  
Orthognathic Surgery ◽  
Frontal Plane ◽  
Facial Asymmetry ◽  
Class Iii ◽  
Skeletal Class ◽  
Bimaxillary Orthognathic Surgery

scholarly journals A New Approach to Set the Absolute Midsagittal Plane of the Mandible Using a Similarity Index in Skeletal Class III Patients with Facial Asymmetry

2020 ◽  
Vol 10 (23) ◽  
pp. 8550
Author(s):  
Woo-Jin Han ◽  
Jae Joon Hwang ◽  
Yun-Hoa Jung ◽  
Bong-Hae Cho ◽  
Kee-Joon Lee ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Similarity Index ◽  
Facial Asymmetry ◽  
Class Iii ◽  
Midsagittal Plane ◽  
New Approach ◽  
Skeletal Class ◽  
Computed Tomography Images ◽  
Bimaxillary Orthognathic Surgery ◽  
Anterior Segments

This study sought to test the feasibility of a newly developed plane called computed modified absolute mandibular midsagittal plane (cmAMP) based on the similarity index (SI) for evaluating the stereoscopical symmetry of the mandible by comparison with other proposed midsagittal planes. This study involved 29 adult patients (15 men, 14 women; average age, 23.1 ± 6.9 years) with skeletal Class III facial asymmetry who underwent bimaxillary orthognathic surgery. Using cone-beam computed tomography images taken before and 1 year after surgery, cmAMP with the highest SI value between the two anterior segments of the hemi-mandible was set by a computer algorithm. Results show that the SI using cmAMP had the highest value (0.83 ± 0.04) before surgery compared to the other midsagittal planes, and was not significantly different from the SI (0.80 ± 0.05) using a facial midsagittal plane (MSP) after surgery. The distance (1.15 ± 0.74 mm) and angle (2.02 ± 0.82°) between MSP and cmAMP after surgery were significantly smaller than those between MSP and other midsagittal planes. In conclusion, the cmAMP plane best matches the two anterior segments of hemi-mandible symmetrically and is the closest to MSP after orthognathic surgery in skeletal Class III patients with facial asymmetry.

scholarly journals The Effect of Bimaxillary Orthognathic Surgery on Nasalance, Articulation Errors, and Speech Intelligibility in Skeletal Class III Deformity Patients

2021 ◽  
Vol 10 (1) ◽  
pp. 8-14
Author(s):  
Hamide Ghaemi ◽  
Erfan Emrani ◽  
Ali Labafchi ◽  
Khashyar Famili ◽  
Haleh Hashemzadeh ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Speech Intelligibility ◽  
Class Iii ◽  
Skeletal Class ◽  
Bimaxillary Orthognathic Surgery

scholarly journals The Accuracy of Jaws Repositioning in Bimaxillary Orthognathic Surgery with Traditional Surgical Planning Compared to Digital Surgical Planning in Skeletal Class III Patients: A Retrospective Observational Study

2020 ◽  
Vol 9 (6) ◽  
pp. 1840
Author(s):  
Martina Barone ◽  
Alberto De Stefani ◽  
Ugo Baciliero ◽  
Giovanni Bruno ◽  
Antonio Gracco
Keyword(s):  
Orthognathic Surgery ◽  
Surgical Planning ◽  
Class Iii ◽  
Skeletal Class ◽  
Bimaxillary Orthognathic Surgery ◽  
Cad Cam ◽  
Treatment Objective ◽  
Digital Methods ◽  
Cephalometric Measurements ◽  
Group D

Background: Technological progress has led to the transition to digital methods to perform surgical planning and to obtain surgical splints with CAD/CAM technologies. The present study aimed to compare the accuracy of jaw repositioning in bimaxillary orthognathic surgery using traditional and digital surgical planning in skeletal class III patients. Methods: This study included 60 skeletal class III patients divided into two groups based on the method used to perform surgical planning: traditional (T, n = 30) and digital (D, n = 30). For each patient, a 2D presurgical Visual Treatment Objective (VTO) was prepared and the outcome of the surgery was compared with that planned by using determined cephalometric measurements (ANB, SNA, SNB, Ar-Go-Me, S-Ar-Go). Statistical analysis showed that the measurements planned and those obtained after surgery were equivalent in Group D. For Group T, the analysis showed equivalence only for one of the considered measurements (ANB). By comparing the results of the two groups, Group D presented a lower level of error than Group T. Conclusions: Digital surgical planning performed significantly better in terms of accuracy of jaw repositioning than the traditional protocol.

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