scholarly journals Postoperative Changes in Tongue Area and Pharyngeal Airway Space following Mandibular Setback Surgery through Intraoral Vertical Ramus Osteotomy

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Kwei-Jing Chen ◽  
Ying-Ting Chen ◽  
Szu-Yu Hsiao ◽  
Michael Yuan-Chien Chen
Keyword(s):  
Null Hypothesis ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Postoperative Changes ◽  
Lateral Cephalograms ◽  
Significant Difference ◽  
Nasopharyngeal Airway ◽  
Intraoral Vertical Ramus Osteotomy ◽  
Male Patients ◽  
Vertical Ramus Osteotomy

Purpose. The aim of this study was to determine changes in the tongue area and pharyngeal airway space (PAS) after intraoral vertical ramus osteotomy (IVRO). Materials and Methods. Serial lateral cephalograms of 40 patients with mandibular prognathism who underwent IVRO were evaluated before (T1), immediately after (T2), and more than 1 year after (T3) surgery. Paired t -tests and Pearson’s correlation analysis were used to evaluate the postoperative changes in the mandible, nasopharyngeal airway (NOP), retropalatal pharyngeal airway (RPP), retroglossal pharyngeal airway (RGP), hypopharyngeal airway (HOP), PAS, and tongue area (TA). The null hypothesis states that there are no significant correlations among the extent of mandibular setback and the changes in the TA and PAS after IVRO. Results. Immediately after the operation (T12), the mandible was set back by 12.6 mm. The NOP, HOP, and PAS were significantly reduced by 35.7 mm2, 116 mm2, and 185 mm2, respectively. The TA was increased by 69.6 mm2. The changes in PAS and TA revealed no significant difference between female and male patients at T12, T23, and T13. Moreover, no significant correlations were found among the extent of mandibular setback, TA changes, and PAS changes after IVRO. Thus, the null hypothesis was accepted. Conclusions. At the final follow-up (T13), no significant change was found in the PAS (including NOP, RPP, RGP, and HOP) and TA. The changes in PAS and TA revealed no significant difference between female and male patients at T12, T23, and T13.

scholarly journals Correlation between the Pharyngeal Airway Space and Head Posture after Surgery for Mandibular Prognathism

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Chun-Ming Chen ◽  
Steven Lai ◽  
Ker-Kong Chen ◽  
Huey-Er Lee
Keyword(s):  
Mandibular Prognathism ◽  
Head Posture ◽  
Oropharyngeal Airway ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Postoperative Changes ◽  
Lateral Cephalograms ◽  
Intraoral Vertical Ramus Osteotomy ◽  
Mandibular Setback Surgery ◽  
Vertical Ramus Osteotomy

Purpose. The aim of this study was to determine the correlation between the pharyngeal airway space and head posture after mandibular setback surgery for mandibular prognathism.Materials and Methods. Serial lateral cephalograms of 37 patients with mandibular prognathism who underwent intraoral vertical ramus osteotomy (IVRO) were evaluated before (T1) and immediately (T2), between 6 weeks and 3 months (T3), and more than 1 year (T4) after surgery. Pairedt-tests and Pearson’s correlation analysis were used to evaluate the postoperative changes in all cephalometric parameters, including the mandible, hyoid, head posture (craniocervical angle), and pharyngeal airway space.Results. The mandible and hyoid were set back by 12.8 mm and 4.9 mm, respectively, at T2. Furthermore, the hyoid showed significant inferior movement of 10.7 mm, with an 8 mm increase in the tongue depth. The upper oropharyngeal airway (UOP) shortened by 4.1 mm, the lower oropharyngeal airway (LOP) by 1.7 mm, and the laryngopharyngeal airway by 2 mm. The craniocervical angle showed a significant increase of 2.8°. UOP and LOP showed a significant correlation with the craniocervical angle at T2 and T4.Conclusions. Our findings conclude that the oropharyngeal airway space is significantly decreased and correlated with a change in the head posture after mandibular setback surgery.

scholarly journals Changes of Hyoid, Tongue and Pharyngeal Airway after Mandibular Setback Surgery by Intraoral Vertical Ramus Osteotomy

2010 ◽  
Vol 80 (2) ◽  
pp. 302-308 ◽  
Author(s):  
Soonshin Hwang ◽  
Chooryung Judi Chung ◽  
Yoon-Jeong Choi ◽  
Jong-Ki Huh ◽  
Kyung-Ho Kim
Keyword(s):  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Intraoral Vertical Ramus Osteotomy ◽  
Mandibular Setback Surgery ◽  
Vertical Ramus Osteotomy

scholarly journals A Cephalometric Study to Evaluate the Variations in Pharyngeal Airway Spaces in Class I and Class II Malcocclusions

2013 ◽  
Vol 01 (03) ◽  
pp. 163-168
Author(s):  
Navreet Sandhu ◽  
Sarabjeet Sandhu ◽  
Kavita Mehta ◽  
Rita Kashyap
Keyword(s):  
Upper Airway ◽  
Class Ii ◽  
Class I ◽  
Pharyngeal Airway ◽  
Significant Difference ◽  
Nasopharyngeal Airway ◽  
Close Relationship ◽  
Mandibular Position ◽  
Craniofacial Biology ◽  
Cephalometric Study

Abstract Introduction: Ever since the time of Edward H. Angle, the effects of upper airway obstruction have been recognized in the field of craniofacial biology. Because of the close relationship between the pharynx and the dentofacial structures, a mutual interaction is expected to occur between the pharyngeal structures and the dentofacial pattern, and therefore justifies orthodontic interest. The purpose of this study was to compare the upper and lower pharyngeal widths and nasopharyngeal area in class I and class II malocclusion patients. Methods: The study sample consisted of 48 subjects of age group 18-26 years, divided into 2 groups : class I(n=24) and class II(n=24). Pharyngeal airways were assessed according to Mc Namara's analysis and Handelman and Osborne method of measuring pharyngeal widths and nasopharyngeal areas. Results: Independent t –test showed a statistically significant difference (p<0.01) in upper aerial width and nasopharyngeal airway area between two groups, showing that in class II cases upper aerial width is narrower and nasopharyngeal area is small when compared to class I cases. Conclusion: Conclusion of the study was that upper aerial width and nasopharyngeal airway area of class II cases were smaller than Class I cases. It was observed that mandibular position with respect to cranial base had an effect on pharyngeal airway.

scholarly journals Are Hyoid Bone and Tongue the Risk Factors Contributing to Postoperative Relapse for Mandibular Prognathism?

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Yu-Chuan Tseng ◽  
Steven Lai ◽  
Huey-Er Lee ◽  
Ker-Kong Chen ◽  
Chun-Ming Chen
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Hyoid Bone ◽  
Pearson Correlation ◽  
Multiple Linear Regression Model ◽  
Mandibular Prognathism ◽  
Mandibular Setback ◽  
Lateral Cephalograms ◽  
Intraoral Vertical Ramus Osteotomy ◽  
One Year

Objective. The purpose of this study was to investigate postoperative stability and the correlation between hyoid, tongue, and mandible position following surgery for mandibular prognathism.Materials and Methods. Thirty-seven patients, treated for mandibular prognathism using intraoral vertical ramus osteotomy (IVRO), were evaluated cephalometrically. A set of four standardized lateral cephalograms were obtained from each subject preoperatively (T1), immediately postoperatively (T2), six weeks to three months postoperatively (T3), and more than one year postoperatively (T4). The Studentt-tests, the Pearson correlation coefficient, and the multiple linear regression were used for statistical analysis.Results. Immediately after surgery, menton (Me) setback was 12.8 mm, hyoid (H) setback was 4.9 mm, and vallecula epiglottica (V) setback was 5.8 mm. The postoperative stability significantly correlated (r=-0.512,p<0.01) with the amount of setback. The hyoid bone and tongue did not have significant effects on postoperative stability. Multiple linear regression model (R2=0.2658,p<0.05) showed predictability: Horizontal Relapse Me (T4-T2) = −6.406 − 0.488Me (T2-T1) + 0.069H (T2-T1) − 0.0619V (T2-T1).Conclusion. Mandibular setback surgery may push the hyoid and tongue significantly backward, but this did not correlate with mandibular relapse. Postoperative stability significantly correlated with the amount of mandibular setback.

scholarly journals Intraoperative Hemorrhage and Postoperative Sequelae after Intraoral Vertical Ramus Osteotomy to Treat Mandibular Prognathism

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Chun-Ming Chen ◽  
Steven Lai ◽  
Ker-Kong Chen ◽  
Huey-Er Lee
Keyword(s):  
Blood Loss ◽  
Operating Time ◽  
Rank Correlation ◽  
Men And Women ◽  
Mandibular Prognathism ◽  
Mandibular Setback ◽  
Intraoral Vertical Ramus Osteotomy ◽  
The Mean ◽  
Blood Loss Volume ◽  
Vertical Ramus Osteotomy

Objective.To investigate the factors affecting intraoperative hemorrhage and postoperative sequelae after orthognathic surgery.Materials and Methods.Eighty patients with mandibular prognathism underwent surgical mandibular setback with intraoral vertical ramus osteotomy (IVRO). The correlation between the blood loss volume and postoperative VAS with the gender, age, and operating time was assessed using thet-test and Spearman rank correlation coefficient. The correlation between the magnitude of mandibular setback with the presence of TMJ clicking symptoms and lip sensation was also assessed.Results.The mean operating time and blood loss volume for men and women were 249.52 min and 229.39 min, and 104.03 mL and 86.12 mL, respectively. The mean VAS in men and women was 3.21 and 2.93, and 1.79 and 1.32 on the first and second postoperative days. There is no gender difference in the operating time, blood loss, VAS, TMJ symptoms, and lip numbness. The magnitude of mandibular setback was not correlated with immediate and long-term postoperative lip numbness.Conclusion.There are no gender differences in the intraoperative hemorrhage and postoperative sequelae (pain, lip numbness, and TMJ symptoms). In addition, neither symptom was significantly correlated with the amount of mandibular setback.

scholarly journals Three-dimensional Analysis of Mandible Ramus Morphology and Transverse Stability After Intraoral Vertical Ramus Osteotomy

2021 ◽  
Author(s):  
Luo Huang ◽  
Shan Tang ◽  
Jing Yan ◽  
Yaoran Liu ◽  
ZhengGuo Piao
Keyword(s):  
Three Dimensional ◽  
Reference Points ◽  
Class Iii ◽  
Mandibular Ramus ◽  
Skeletal Class ◽  
Computed Tomography Images ◽  
Postoperative Changes ◽  
Transverse Stability ◽  
Intraoral Vertical Ramus Osteotomy ◽  
Vertical Ramus Osteotomy

Abstract Objectives: The purpose of this study was to investigate short- and long-term postoperative changes of both morphology and transverse stability in mandibular ramus after intraoral vertical ramus osteotomy (IVRO) in patients with jaw deformity using three-dimensional (3D) orthognathic surgery planning treatment software for measurement of distances and angles.Study Design: This retrospective study included consecutive patients with skeletal Class III malocclusion who had undergone intraoral vertical ramus osteotomy and computed tomography images before (T0), immediately after (T1), and one year after (T2) surgery. Reference points, reference lines and evaluation items were designated on the reconstructed 3D surface models to measure distances, angles and volume. The average values at T0, T1, T2 and time-dependent changes in variables were obtained.Results: After surgery, the condylar length, ramal height, mandibular body length and mandibular ramus volume were significantly decreased (P < .01), while clinically insignificant change was observed from T1 to T2. The angular length was increased immediately after surgery (P < .05), but it was decreased 1 year after surgery (P < .05). Lateral ramal inclination showed significant increase after surgery (P < .05) and maintained at T2.Conclusion: Changes in the morphology of the mandibular ramus caused by IVRO do not obviously bring negative effect on facial appearance. Furthermore, despite position and angle of mandibular ramus changed after IVRO, good transverse stability was observed postoperatively. Therefore, IVRO technique can be safely used without compromising esthetic results.

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