scholarly journals Cone-beam computed tomography evaluation on the condylar displacement following sagittal split ramus osteotomy in asymmetric setback patients: Comparison between conventional approach and surgery-first approach

2017 ◽  
Vol 87 (5) ◽  
pp. 733-738 ◽  
Author(s):  
Min-Hee Oh ◽  
Hyeon-Shik Hwang ◽  
Kyung-Min Lee ◽  
Jin-Hyoung Cho
Keyword(s):  
Computed Tomography ◽  
Correlation Analysis ◽  
Cone Beam Computed Tomography ◽  
Facial Asymmetry ◽  
Three Dimensions ◽  
Conventional Group ◽  
Cone Beam ◽  
Sagittal Split Ramus Osteotomy ◽  
Surgery First ◽  
Condylar Displacement

ABSTRACT Objective: To compare the condylar displacement following sagittal split ramus osteotomy (SSRO) in asymmetric setback patients between the conventional approach and surgery-first approach and to determine whether the condylar displacement is affected by asymmetric setback in SSRO patients. Materials and Methods: This was a retrospective study. The subjects consisted of patients with facial asymmetry who underwent SSRO and had cone-beam computed tomography taken before and 1 month after surgery. They were allocated into the conventional (n = 18) and surgery-first (SF) groups (n = 20). Descriptive, independent t-tests and Pearson correlation analysis were computed. Results: The amount of condylar displacement in x-, y-, and z-directions and Euclidean distance showed no statistically significant differences between the conventional and SF groups. Comparing the postoperative condylar position with the preoperative position, the condylar displacement occurred in posterior (P < .05) and downward (P < .05) directions in both groups except on the deviated side in the conventional group. The condylar displacement occurred in a posterior (P < .05) direction on the deviated side of the conventional group. However, the condylar displacement in three dimensions showed no statistically significant differences between the two groups. In the correlation analysis, the condylar displacement in both the deviated and contralateral sides showed no significant correlation with asymmetric setback in either group. Conclusion: The condylar displacement in three dimensions and the distance of condylar displacement in SSRO patients with facial asymmetry showed no significant difference between conventional and SF groups. Condylar displacement was not associated with asymmetric setback.

scholarly journals Cone-beam computed tomography evaluation on the changes in condylar long axis according to asymmetric setback in sagittal split ramus osteotomy patients

2016 ◽  
Vol 87 (2) ◽  
pp. 254-259 ◽  
Author(s):  
Sun-Young Lim ◽  
Tingting Jiang ◽  
Min-Hee Oh ◽  
Min-Suk Kook ◽  
Jin-Hyoung Cho ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Correlation Analysis ◽  
Cone Beam Computed Tomography ◽  
Pearson Correlation ◽  
Statistical Significance ◽  
Three Dimensional ◽  
Cone Beam ◽  
Sagittal Split Ramus Osteotomy ◽  
Pearson Correlation Analysis ◽  
The Right

ABSTRACT Objective: To determine whether the condylar rotation is affected by asymmetric setback in patients undergoing sagittal split ramus osteotomy. Materials and Methods: Thirty patients who underwent bilateral sagittal split ramus osteotomy setback surgery were divided into the two groups, symmetric setback and asymmetric setback, according to the right/left difference of setback amount (<2.0, ≥2.0 mm). Condylar long axis changes were evaluated using the three-dimensional superimposition of before and immediately after surgery cone-beam computed tomography volume images. Evaluations were performed separately in lesser setback and greater setback side in patients undergoing asymmetric setback, whereas both side condyles were evaluated together in patients undergoing symmetric setback. Condylar axis changes on axial view were correlated with setback amount or right/left setback difference using Pearson correlation analysis. Results: In general, the condylar axis change occurred in a pattern of inward rotation. The condyles in patients undergoing symmetric setback showed 3.4° rotation in average. In case of asymmetric setback, the lesser setback side showed larger value (4.3°) than the greater setback side (2.3°) with a statistical significance. In the correlation analysis, setback amount showed no significant correlation with the condylar axis changes in both groups. However, correlation with right/left setback difference showed a positive correlation in lesser setback side of patients undergoing asymmetric setback. Conclusion: The findings of this study indicate that large amount of setback alone does not contribute to the change in condylar long axis, but asymmetric setback might cause a change in condylar long axis, particularly on the lesser setback side.

scholarly journals Sequential changes of postoperative condylar position in patients with facial asymmetry

2016 ◽  
Vol 87 (2) ◽  
pp. 260-268 ◽  
Author(s):  
Svetlana Tyan ◽  
Hyun-Hye Kim ◽  
Ki-Ho Park ◽  
Su-Jung Kim ◽  
Kyung-A Kim ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Orthognathic Surgery ◽  
Facial Asymmetry ◽  
Cone Beam ◽  
Rigid Fixation ◽  
Glenoid Fossa ◽  
Sagittal Split Ramus Osteotomy ◽  
Affected Side ◽  
Condylar Position

ABSTRACT Objective: To evaluate sequential images of the condylar position in relation to the glenoid fossa after orthognathic surgery in patients with facial asymmetry using cone beam computed tomography. Materials and Methods: A total of 20 adult patients (11 men and 9 women; mean age, 22.1 ± 4.02 years) with facial asymmetry who underwent sagittal split ramus osteotomy with rigid fixation were involved. Cone beam computed tomography scans were obtained before treatment (T0), 1 month before the surgery (T1), and 1 day (T2), 3 months (T3), 6 months (T4), and 12 months (T5) after the surgery. The condyle position was evaluated. Results: At 1 day after surgery (T2), the condylar position on both sides significantly changed posteriorly, inferiorly, and laterally, but no significant difference was observed between the nonaffected and affected sides. The condyle on the nonaffected side had a tendency to recover its preoperative position at 3 months after surgery (T3) and inclined slightly laterally up to 1 year after the surgery (T5). The condyle on the affected side returned more closely to the glenoid fossa than to its pretreatment position at 3 months after surgery (T3). Thereafter, it showed a more backward and downward position (T5). Conclusions: The overall condylar position after an orthognathic surgery in patients with facial asymmetry was relatively stable at 1 year after surgery. However, the condyle on the affected side during the first 3 months after surgery should be carefully monitored for surgical stability.

Position of the mandibular canal before and after bilateral sagittal split ramus osteotomy: a cone beam computed tomography study

2021 ◽  
Author(s):  
Fernanda Chiguti Yamashita ◽  
Lilian Cristina Vessoni Iwaki ◽  
Amanda Lury Yamashita ◽  
Elen de Souza Tolentino ◽  
Vinicius Eduardo de Oliveira Verginio ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Mandibular Canal ◽  
Cone Beam ◽  
Sagittal Split Ramus Osteotomy ◽  
Before And After

scholarly journals Assessment of dehiscence and fenestration in children and adolescents using cone beam computed tomography

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Aslıhan Akbulut ◽  
Beyza Ballı Akgöl ◽  
Kaan Orhan ◽  
Merve Bayram
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Primary Teeth ◽  
Three Dimensions ◽  
Cone Beam ◽  
Permanent Teeth ◽  
Type I ◽  
Chi Square ◽  
Children And Adolescent ◽  
Adolescent Patients

Objectives: To define the prevalence of dehiscence and fenestration and classify them in terms of the localization of fenestrations in a random sampled group of children and adolescent patients using cone-beam computed tomography (CBCT).Methods:  CBCT performed at the Department of Oral and Maxillofacial Radiology of patients referred by the paediatric dentistry clinic were included in this retrospective study. Image evaluations were performed by dentomaxillofacial radiologist (AA, asst. prof.), and these images were examined in three dimensions of the axial, coronal, and sagittal planes. Intraexaminer agreement for the evaluations were found acceptable. The presence/absence of dehiscence and/or fenestration, fenestration’s classification type, and localization of defects were recorded. Moreover, the presence/absence of periapical lesion in related root with dehiscence and fenestration was noted. For statistical analysis, The Chi-Square test, Fisher Freeman Halton Test, and Yates' Continuity of Correction were used.Results: 3061 roots in 1801 teeth of 120 cases were analyzed. The mean age was 9.97±2.22 years. Dehiscence was detected in 261(8.5%) roots of 161(8.9%) teeth, and fenestration was detected 63(2%) roots of 36(2%) teeth. The most common fenestration type was Type I, followed by Type II and IV. Dehiscence was observed more frequently in primary teeth than permanent teeth, and the difference was statistically significant (p:0.000). Dehiscence and fenestration incidence in maxillary teeth was significantly higher than in the mandibular teeth (pdehiscence:0.000, pfenestration:0.004). Apical lesions were observed more in primary teeth than permanent teeth for both defects.Conclusions: This study concludes that alveolar dehiscence and fenestrations are more common in primary teeth than permanent teeth. Moreover, these defects were detected more for the teeth in the maxilla. Concerning endodontic and orthodontic therapies in maxilla, use of CBCT is useful in determining the region's anatomical structure accurately in suspected cases of child and adolescent patients.

scholarly journals Gambaran idiopathic osteosclerosis gigi molar ketiga impaksi pada radiograf Cone Beam Computed Tomography

2021 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Anak Agung Gde Dananjaya Agung ◽  
Ni Ketut Ayu Lestarini
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Treatment Plan ◽  
Third Molar ◽  
Image Resolution ◽  
Three Dimensions ◽  
Cone Beam ◽  
Mandibular Third Molar ◽  
The Right ◽  
Detailed Picture

Objectives: To analyze idiopathic osteosclerosis radiographs associated with impacted third molars (M3) on cone beam computed tomography (CBCT). Case Report: A 36-year-old woman came to the Dentology Clinic complaining that the right mandibular third molar area often felt sore. The patient was referred for CBCT examination and incidentally, a radiopaque image with clear boundaries, irregular shape was found on the periapical impacted third molar without caries in the tooth crown. The treatment plan that will be carried out on the tooth is extraction. Conclusion: Idiopathic osteosclerosis lesions are lesions that occur in vital teeth that have the characteristics of a well-defined radiopaque appearance and are asymptomatic. Characteristics of idiopathic osteosclerosis lesions can be visualized by CBCT well. CBCT has the advantage of being able to display a detailed picture of the lesion in three dimensions (3D) with a fairly good image resolution.

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