Three-dimensional alterations in pharyngeal airspace, soft palate, and hyoid bone of class II and class III patients submitted to bimaxillary orthognathic surgery: A retrospective study

2019 ◽  
Vol 47 (6) ◽  
pp. 883-894 ◽  
Author(s):  
Gustavo Nascimento de Souza Pinto ◽  
Liogi Iwaki Filho ◽  
Isolde Terezinha dos Santos Previdelli ◽  
Adilson Luiz Ramos ◽  
Amanda Lury Yamashita ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Soft Palate ◽  
Orthognathic Surgery ◽  
Hyoid Bone ◽  
Three Dimensional ◽  
Class Ii ◽  
Class Iii ◽  
Bimaxillary Orthognathic Surgery

scholarly journals Postsurgical Stability of Temporomandibular Joint of Skeletal Class III Patients Treated with 2-Jaw Orthognathic Surgery via Computer-Aided Three-Dimensional Simulation and Navigation in Orthognathic Surgery (CASNOS)

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ling-Chun Wang ◽  
Yi-Hao Lee ◽  
Chi-Yu Tsai ◽  
Te-Ju Wu ◽  
Ya-Ying Teng ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Three Dimensional ◽  
Class Iii ◽  
Skeletal Class ◽  
Computer Aided ◽  
Before And After ◽  
Bimaxillary Orthognathic Surgery ◽  
The Mean ◽  
Dimensional Simulation ◽  
The Right

Objective. The aim of this study is to clarify the postsurgical stability of temporomandibular joints in skeletal class III patients treated with 2-jaw orthognathic surgery which was performed utilizing computer-aided three-dimensional simulation and navigation in orthognathic surgery (CASNOS) protocol. Materials and Methods. 23 consecutive nongrowing skeletal class III patients with mandibular prognathism associated with maxillary retrognathism treated with 2-jaw orthognathic surgery between 2018 and 2019 were enrolled in this study. The surgery was planned according to the standardized protocol of CASNOS (computer-aided three-dimensional simulation and navigation in orthognathic surgery). Computed tomography (CT) scans were performed in all patients 3 weeks presurgically and 6 months postsurgically. ITKSNAP and 3D Slicer software were used to reconstruct three-dimensional facial skeletal images, to carry out image segmentation, and to superimpose and quantify the TMJ position changes before and after surgery. Amount of displacement of the most medial and lateral points of the condyles and the change of intercondylar angles were measured to evaluate the postsurgical stability of TMJ. Results. A total amount of 23 skeletal class III patients female : male = 12 : 11 with age ranged from 20.3 to 33.5 years (mean: 24.39 ± 4.8   years   old ) underwent Le Fort I maxillary advancement and BSSO setback of the mandible. The surgical outcome revealed the satisfactory correction of their skeletal deformities. The mean displacement of the right most lateral condylar point (RL-RL ′ ) was 1.04 ± 0.42   mm and the mean displacement of the left most lateral condylar point (LL-LL ′ ) was 1.19 ± 0.41   mm . The mean displacement of the right most medial condylar point (RM-RM ′ ) was 1.03 ± 0.39   mm and the left most medial condylar point (LM-LM ′ ) was 0.96 ± 0.39   mm . The mean intercondylar angle was 161.61 ± 5.08 ° presurgically and 159.28 ± 4.92 ° postsurgically. Conclusion. The postsurgical position of TM joint condyles in our study only presented a mild change with all the landmark displacement within a range of 1.2 mm. This indicates the bimaxillary orthognathic surgery via 3D CASNOS protocol can achieve a desired and stable result of TMJ position in treating skeletal class III adult patients with retrognathic maxilla and prognathic mandible.

scholarly journals A Retrospective Evaluation of Facial Volume in Patients Submitted to Bimaxillary Orthognathic Surgery Using 3D Stereophotogrammetry

2021 ◽  
Vol 6 ◽  
pp. 247275122199027
Author(s):  
Patrick Rocha Osborne ◽  
Laís Valencise Magri ◽  
Ana Maria Bettoni Rodrigues da Silva ◽  
Marco Antônio Moreira Rodrigues da Silva ◽  
Alexander Tadeu Sverzut ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Orthognathic Surgery ◽  
Three Dimensional ◽  
The Other ◽  
Retrospective Evaluation ◽  
Le Fort ◽  
Significant Difference ◽  
Bimaxillary Orthognathic Surgery ◽  
3D Stereophotogrammetry ◽  
Le Fort I

The purpose of this retrospective study was to determine postoperative volume differences associated with orthognathic surgery after controlling for time, gender, age, and side of face. Three-dimensional (3D) photographs of 10 patients submitted to simultaneous Le Fort I + Bilateral Sagittal Split osteotomies were analyzed. The images were obtained using a Vectra® M3 device (Canfield, NJ, USA) and were captured postoperatively, at 1 week (1S), 1 month (1M), 2 months (2M), 6 months, (6M) and 1 year (1A). The photo taken at 1A was used as the basis of comparison for the other photos (1S, 1M, 2M, and 6M). Greatest facial volume was observed at 1 week after surgery (42.54 cm3, SD = 29.71 cm3), with men in this period showing higher values (60.20 cm3, SD = 36.75 cm3) than women (30.76 cm3, SD = 19.04 cm3). The most extensive facial volume reduction occurred between the first week and the first month; postoperatively (52.1%). No significant difference was found between age and side groups.

scholarly journals Impact of orthognathic surgery on the prevalence of dehiscence in Class II and Class III surgical-orthodontic patients:

2021 ◽  
Author(s):  
Monique Cimão dos Santos ◽  
Lilian Cristina Vessoni Iwaki ◽  
José Valladares-Neto ◽  
Maristela Sayuri Inoue-Arai ◽  
Adilson Luiz Ramos
Keyword(s):  
Orthognathic Surgery ◽  
Alveolar Bone ◽  
Class Ii ◽  
Vascular Supply ◽  
Cone Beam ◽  
Third Molars ◽  
Class Iii ◽  
Before And After ◽  
Orthodontic Patients ◽  
Supply Reduction

ABSTRACT Objectives The objectives were to evaluate and compare the presence of bone dehiscence before and after orthognathic surgery. Materials and Methods In this retrospective study, 90 cone-beam computed tomography (CBCT) scans from 45 patients were evaluated. Class II (n = 23) and Class III (n = 22) orthodontic patients who were being prepared for orthognathic surgery were measured. CBCT scans were obtained about 30 days prior to (T0) and 6 months after (T1) double jaw orthognathic surgery. The distance between the cemento-enamel junction (CEJ) and the alveolar bone crest was assessed at the buccal and lingual surfaces of all teeth, on both sides and arches, except for the second premolars and the second and third molars. A total of 1332 sites were measured for Class II (644) and Class III (688) patients. The software used was OsiriX (version 3.3 32-bit). Data were compared with Wilcoxon and McNemar tests at the 5% level. Results Bone dehiscence before surgery was present in 26% and 15% of the Class II and III groups, respectively. The presence of dehiscence increased to 31% in the Class II and 20% in the Class III patients after surgery (P < .05). Conclusions The prevalence of dehiscence increased slightly in Class II and Class III surgical-orthodontic patients after orthognathic surgery. Temporary vascular supply reduction and oral hygiene difficulties may explain these results; however, more studies are needed.

Sign in / Sign up

Export Citation Format

Share Document