Three-dimensional analysis of lip soft tissue changes and related jaw changes in patients with skeletal class III malocclusion and facial asymmetry

2021 ◽  
pp. 1-14
Author(s):  
Wenjie Xu ◽  
Hao Tan ◽  
Xuehuan Meng ◽  
Ye Ming ◽  
Tao Wang ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Orthognathic Surgery ◽  
Three Dimensional ◽  
Facial Asymmetry ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Skeletal Class ◽  
Tissue Changes ◽  
Soft Tissue Changes ◽  
Jaw Surgery

OBJECTIVE: To investigate three-dimensional soft tissue changes of lips and related jaw changes in patients with skeletal class III malocclusion and facial asymmetry using cone-beam computerized tomography (CBCT). METHOD: This study included 46 CBCT scans of patients with aforementioned character before (T1) and 6–12 months after orthognathic surgery (T2). Subjects were divided into 2 groups according to two types of orthognathic surgery namely, the one-jaw surgery group who underwent bilateral sagittal splint ramus osteotomy (BSSRO) and the two-jaw surgery group who underwent Le Fort I osteotomy and BSSRO. Mimics 19.0 software are used for model reconstruction, landmark location and three-dimensional cephalometric analysis. Descriptive statistics and correlation analyses are used to investigate jaw hard tissue and lip soft tissue changes. RESULTS: In one-jaw group, the mandible shows changes in contour and position (p <  0.05), and the surgery causes changes of lip structure on the deviated side. While in two-jaw group, jaws only show changes in spatial position, and surgery changes contour of bilateral lips and nasolabial angle (p <  0.05). At the same time, lip symmetry increases significantly in both groups postoperatively. CONCLUSIONS: Orthognathic surgery can improve lip aesthetics in patients with skeletal class III malocclusion and facial asymmetry. However, changes induced by two surgical approaches are different. Surgeons should have a clear acquaintance with this difference to deal with different situations.

Soft tissue changes after a mandibular osteotomy for symmetric skeletal class III malocclusion

Odontology ◽  
2016 ◽  
Vol 105 (3) ◽  
pp. 375-381
Author(s):  
Seigo Ohba ◽  
Haruka Kohara ◽  
Takamitsu Koga ◽  
Takako Kawasaki ◽  
Kei-ichirou Miura ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Mandibular Osteotomy ◽  
Skeletal Class ◽  
Tissue Changes ◽  
Soft Tissue Changes

scholarly journals Changes in soft tissue profile during the treatment of Class III malocclusion treated with Class III activator

2013 ◽  
Vol 2 (2) ◽  
pp. 24-29
Author(s):  
MSA Mamun ◽  
MLA Hyder ◽  
MZ Hossain
Keyword(s):  
Soft Tissue ◽  
Treated Patient ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Facial Profile ◽  
Skeletal Class ◽  
Soft Tissue Profile ◽  
Tissue Changes ◽  
Soft Tissue Changes ◽  
Cephalometric Study

Objective: This longitudinal retrospective cephalometric study was undertaken in an attempt to evaluate the effect of Class III activator on the soft tissue structures in subjects with skeletal Class III. Methods: The material consisted of cephalometric films of 26 Class III patients (13females and 13 males, with a mean age of 13.58±4.38 years). Each treated patient was matched before treatment with Class III subject for sex and age. Differences at T1 and T2 were examined using paired t-test. Results: After treatment the patients' soft tissue profile improved significantly compare with before treatment. Conclusion: Soft tissue changes were found in patients treated by Class III activator in skeletal Class III patients. Clinical relevance: Class III activator may be an efficient method to improving soft tissue facial profile in Skeletal Class III malocclusion. DOI: http://dx.doi.org/10.3329/bjodfo.v2i2.16160 Ban J Orthod & Dentofac Orthop, April 2012; Vol-2, No.2, 24-29

scholarly journals The outcome of skeletofacial reconstruction with mandibular rotation for management of asymmetric skeletal class III deformity: A three-dimensional computer-assisted investigation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ting-Yu Wu ◽  
Rafael Denadai ◽  
Hsiu-Hsia Lin ◽  
Cheng-Ting Ho ◽  
Lun-Jou Lo
Keyword(s):  
Three Dimensional ◽  
Mouth Opening ◽  
Facial Asymmetry ◽  
Computer Assisted ◽  
Rigid Fixation ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Skeletal Class ◽  
Jaw Surgery

Abstract The mandibular proximal ramus segments should be moved and rotated during orthognathic surgery-based skeletofacial reconstruction for the correction of challenging patients with facial asymmetry and malocclusion, but quantitative data regarding this rotation were not sufficient to date. This 3D computer-assisted study measured the proximal ramus segment rotation after 3D simulation-guided two-jaw surgery in patients with facial asymmetric deformity and class III malocclusion (n = 31). Using 3D mandible models and a reliable proximal ramus segment-related plane, angular changes in pitch, roll and yaw directions were measured before and one month after surgery. Significant rotational changes (p < 0.01) were observed in the left and right sides and overall proximal ramus segments after surgery, with absolute differences of 4.1 ± 3.0 (range −7.8 to 6.9), 2.8 ± 2.3 (−8.8 to 5.0), and 2.7 ± 2.4 (−6.6 to 9.9) degrees in pitch, roll, and yaw rotations, respectively. Numbness and mouth opening limiting occurred within the first 6 months after surgery but the patients had an unremarkable long-term postoperative course, with no revisionary surgery required. This study contributes to the multidisciplinary-related literature by revealing that proximal ramus segment rotation and rigid fixation with no postoperative intermaxillary immobilization was practicable in skeletofacial surgery for the successful treatment of asymmetric deformity and class III malocclusion.

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