SOFT TO HARD TISSUE RATIOS AFTER BIMAXILLARY ORTHOGNATHIC SURGERY IN CLASS III PATIENTS

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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Dimensional changes of maxillary sinuses and pharyngeal airway in Class III patients undergoing bimaxillary orthognathic surgery

The Angle Orthodontist ◽

10.2319/100212-777.1 ◽

2013 ◽

Vol 83 (5) ◽

pp. 824-831 ◽

Cited By ~ 26

Author(s):

Eleni Panou ◽

Melih Motro ◽

Mustafa Ateş ◽

Ahu Acar ◽

Nejat Erverdi

Keyword(s):

Orthognathic Surgery ◽

Class Iii ◽

Cross Sectional ◽

Dimensional Changes ◽

Pharyngeal Airway ◽

Mandibular Setback ◽

Bimaxillary Orthognathic Surgery ◽

Significant Change ◽

The Relationship ◽

Maxillary Sinuses

ABSTRACT Objective: To evaluate the pharyngeal airway and maxillary sinus volume changes after mandibular setback surgery combined with maxillary advancement and/or impaction surgery. Materials and Methods: Seventeen Class III skeletal patients (11 females, 6 males) who required bimaxillary orthognathic surgery were selected. Volumetric measurements were performed using cone beam computed tomography (CBCT) scans preoperatively and 3.9 ± 0.87 months postoperatively. All the CBCT scans were assessed and analyzed using MIMICS 14.0 software. Preoperative and postoperative volumes of pharyngeal airway and maxillary sinuses and the relationship between the amounts of surgical movement of the jaws and the above volumes were statistically evaluated. Results: The pharyngeal airway area presented no significant change except for the lower and total pharyngeal airway volumes in males, in whom a significant decrease was observed (4196.27 ± 2061.11 mm3 and 3375.53 ± 3624.67 mm3, respectively). No significant change was observed in the minimal cross-sectional area of the pharyngeal airway. There was a significant decrease in the volume of the maxillary sinuses after the surgery by 3448.09 ± 3315.56 mm3. No correlation was found between the amount of skeletal movement and the change in the volume of pharyngeal airway or maxillary sinuses. Conclusion: There was a significant decrease only for lower and total pharyngeal airway volumes in males and a significant decrease in the volume of the maxillary sinuses.

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Effect of Mandibular Set-Back surgery versus Bimaxillary Orthognathic Surgery on pharyngeal airway space and consequent daytime sleepiness in Dento-skeletal class III malocclusion patients.

Egyptian Dental Journal ◽

10.21608/edj.2021.69271.1562 ◽

2021 ◽

Vol 67 (3) ◽

pp. 1943-1952

Author(s):

Hussein Hatem ◽

Sameh Seif ◽

Walaa Ahmed ◽

Shaimaa Refahee

Keyword(s):

Daytime Sleepiness ◽

Orthognathic Surgery ◽

Class Iii ◽

Class Iii Malocclusion ◽

Skeletal Class ◽

Pharyngeal Airway ◽

Back Surgery ◽

Bimaxillary Orthognathic Surgery

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

Applied Sciences ◽

10.3390/app10238550 ◽

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.

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