scholarly journals Estimating the location of the center of resistance of canines

2015 ◽  
Vol 86 (3) ◽  
pp. 365-371 ◽  
Author(s):  
Feifei Jiang ◽  
Katherine Kula ◽  
Jie Chen
Keyword(s):  
Computed Tomography ◽  
Finite Element ◽  
Cone Beam Computed Tomography ◽  
Contact Surface ◽  
Root Length ◽  
Cone Beam ◽  
Average Difference ◽  
Fe Method ◽  
The Difference ◽  
Center Of Resistance

ABSTRACT Objective:  To develop a method to quickly estimate the location of center of resistance (CR) in mesial-distal (MD) and buccal-lingual (BL) directions from the tooth's image. Materials and Methods:  The maxillary cone-beam computed tomography (CBCT) scans of 18 patients were used. Finite element (FE) models of the canines and their surrounding tissues were built based on their CBCT scans to calculate the locations of CR. Root length, centroid of the contact surface (CCS), and centroid of projection of the contact surface (CPCS) were also obtained from the images. The CCS and CPCS locations were projected on the tooth's long axis, which were represented as percentages of the root length measured from the root's apex. Results:  Using the FE results as the standards, the errors of using CCS or CPCS to estimate CR were calculated. The average location of CR calculated using the FE method was 60.2% measured from the root’s apex in the MD direction and 58.4% in the BL direction. The location of the CCS was 60.9%. The difference in CR was 0.7% in the MD direction and 2.5% in the BL direction. The location of CPCS was 60.2% in the MD direction and 59.1% in the BL direction, which resulted in a 0.1% and 0.8% difference with the reference CR, respectively. The average difference of CR in the MD and BL directions was small but statistically significant (P < .05). Conclusion:  The locations of the CR of a human canine in the MD and BL directions can be estimated by finding the CPCSs in those directions.

Effect of root length over alveolar bone on fracture resistance: Detection by cone-beam computed tomography

2019 ◽  
Vol 7 (3) ◽  
pp. 55
Author(s):  
Fumi Mizuhashi ◽  
Ichiro Ogura ◽  
Yoshihiro Sugawara ◽  
Makoto Oohashi ◽  
Hirokazu Sekiguchi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Root Length ◽  
Fracture Resistance ◽  
Alveolar Bone ◽  
Cone Beam ◽  
Resistance Detection

scholarly journals Palatal mucosa thickness and palatal neurovascular bundle position evaluation by cone-beam computed tomography—retrospective study on relationships with palatal vault anatomy

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12699
Author(s):  
Ilkim Karadag ◽  
Hasan Guney Yilmaz
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Inverse Correlation ◽  
Neurovascular Bundle ◽  
Cone Beam ◽  
Maximum Width ◽  
Second Molar ◽  
Mucosal Thickness ◽  
The Difference ◽  
Palatal Mucosa

Background Measuring the thickness of the palatal mucosa at the planning of the surgical procedure is an important step in order to obtain the maximum width and thickness of the graft from the appropriate area. The aim of this study is to determine whether there is a relationship between palatal angle (PA) or palatal depth (PD) and palatal mucosa thickness (PMT) or palatal neurovascular bundle distance (PNBD). Methods PMT, PNBD, PD and PA were measured on cone-beam computed tomography (CBCT) images of maxillary posterior region of 200 male and 200 female patients. The mean of all parameters according to gender was compared and the significance of the difference detected between groups was evaluated. Potential relationship between PMT or PNBD and PA or PD was also evaluated. Results In females, the palatal mucosa was significantly thinner at all tooth regions (p < 0.005), and PNBD was lower only at the level of the second molar (p < 0.001). In addition, it was found that there was a significant inverse correlation between the palatal depth value and the palatal mucosal thickness, and palatal depth was correlated with the palatal neurovascular bundle distance (p ≤ 0.001). Discussion Consistent with previous studies, it was observed that the thickest mucosa in the palatal region was located in the region of the premolar teeth, and women had thinner palatal mucosa. In addition, in patients with a deeper palate vault, the palatal mucosa was thinner, but the palatal neurovascular bundle was more distant from the cemento-enamel junction.

scholarly journals Impact of intraoperative Cone-Beam Computed Tomography use on patient satisfaction after closed nasal reduction

2021 ◽  
Vol 4 ◽  
pp. 77-84
Author(s):  
C. Bruehlmann ◽  
M. Blumer ◽  
M.B. Soyka
Keyword(s):  
Computed Tomography ◽  
Patient Satisfaction ◽  
Cone Beam Computed Tomography ◽  
Intraoperative Imaging ◽  
Statistical Significance ◽  
Clinical Importance ◽  
Cone Beam ◽  
The Difference ◽  
And Function ◽  
Female Subjects

Background: The aim of the study was to assess, whether there is a difference in aesthetic and functional patient satisfaction between closed nasal reductions with intraoperative Cone-Beam Computed Tomography (CBCT) and without using intraoperative medical imaging. Methods: A monocentric, retrospective cohort study of 43 patients (20 patients treated with intraoperative CBCT and 23 patients treated without intraoperative imaging) was conducted. Subjective postoperative aesthetic and functional aspects of the nose were assessed. Additionally, questions comparing the aesthetics and function of the nose before and after the accident and on the desire of revision surgery were asked. Results: Both the SCHNOS-C and total SCHNOS score in the non-CBCT group were higher than the respective scores of the CBCT-group. The comparison of SCHNOS-C between male subjects of the two groups showed no statistical significance. The comparison of SCHNOS-C between male and female subjects over both groups showed significantly higher scores for female subjects. Conclusions: Patients undergoing surgery with intraoperative CBCT imaging showed better aesthetical outcomes than patients, treated without intraoperative imaging. However, the difference showed no clinical importance, so that both strategies appear to have comparable outcomes regarding postoperative aesthetics and function of the nose. Gender instead of the different strategies could contribute to the demonstrated differences. Female subjects seem to be less satisfied with the aesthetics of their nose postoperatively, potentially being more sensitive to remaining nasal deformities after surgery.

scholarly journals Evaluation of the setup discrepancy between 6D ExacTrac and cone beam computed tomography in spine stereotactic body radiation therapy

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0252234
Author(s):  
Jaehyeon Park ◽  
Ji Woon Yea ◽  
Jae Won Park ◽  
Se An Oh
Keyword(s):  
Computed Tomography ◽  
Radiation Therapy ◽  
Cone Beam Computed Tomography ◽  
Stereotactic Body Radiation Therapy ◽  
Assistive Device ◽  
Cone Beam ◽  
Spinal Tumors ◽  
Stereotactic Body Radiation ◽  
Cbct Image ◽  
The Difference

The objective of this study was to analyze the difference in residual setup errors between 6D ExacTrac and 3D cone-beam computed tomography (CBCT) image-guided systems in spinal stereotactic body radiation therapy (SBRT). We investigated 76 patients with spinal tumors who received SBRT using Novalis Tx at our institution between January 2013 and September 2020. A Vac-lok (EZ-FIX®, Arlico Medical Company, South Korea) fixture and an assistive device, based on the region involved, were used to immobilize patients and to increase the inter-fractional setup reproducibility. The difference in the root mean square (RMS) between the 6D ExacTrac and 3D CBCT was -0.75 mm, 0.45 mm, 0.16 mm, and -0.03°; the RMS value was 1.31 mm, 1.06 mm, 0.87 mm, and 0.64°; and the standard deviation was 0.80 mm, 0.72 mm, 0.62 mm, and 0.44° for lateral, longitudinal, vertical, and yaw directions, respectively. The difference in the average RMS between ExacTrac and CBCT was <1.03 mm in the translation direction and <0.47° in the rotational direction; the results were statistically significant in the lateral, longitudinal, and vertical directions, but not in the yaw direction. Thus, it is necessary to verify the ExacTrac image according to the CBCT image.

scholarly journals The description of condyle position in disc displacement with reduction using Cone Beam Computed Tomography 3D radiographic analysis

2009 ◽  
Vol 21 (2) ◽  
Author(s):  
Liana Rahmayani ◽  
Erna Kurnikasari ◽  
Rasmi Rikmasari
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Joint Space ◽  
Temporomandibular Joint Disorders ◽  
Cone Beam ◽  
Disc Displacement ◽  
Significant Difference ◽  
Condyle Position ◽  
The Difference ◽  
Disc Displacement With Reduction

One of the temporomandibular joint disorders that mostly occurs is disc displacement with reduction. Disc displacement that causes the displacement of condyle position can be evaluated by using radiograph. The Cone Beam Computed Tomography (CBCT-3D) is a radiograph equipment which is able to capture the condyle position from many directions. This research was aimed to see the condyle position in patients with disc displacement with reduction symptoms. This research was conducted to 11 patients with symptoms of disc displacement with reduction and 3 patients without symptoms of disc displacement with reduction as the counterpart. What was conducted to the sample was the radiographic imaging using CBCT-3D radiography, followed by measuring the joint space distance in the sagittal and coronal directions. The result of the research was analyzed using the T-test. Statistically, the result of the test showed a significant difference ( = 0.05) between patients with disc displacement with reduction symptoms and the patients without symptoms, in sagittal and coronal views. The conclusion led to the difference in condyle positions in patients with the disc displacement with reduction and patients without the symptoms which meant there was a condyle position displacement that caused the distance alteration in joint space in sagittal and coronal directions.

scholarly journals Evaluation of dehiscence and fenestration in adolescent patients affected by unilateral cleft lip and palate: A retrospective cone beam computed tomography study

2016 ◽  
Vol 86 (3) ◽  
pp. 431-436 ◽  
Author(s):  
Suleyman Kutalmis Buyuk ◽  
Esra Ercan ◽  
Mevlut Celikoglu ◽  
Ahmet Ercan Sekerci ◽  
Mukerrem Hatipoglu
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Cone Beam ◽  
Control Group ◽  
Anterior Teeth ◽  
The Difference ◽  
Student’S T ◽  
Student’S T Test

ABSTRACT Objective:  To evaluate the presence of dehiscence and fenestration defects around anterior teeth in the cleft region and to compare these findings with the noncleft side in the same patients using cone beam computed tomography (CBCT). Materials and Methods:  CBCT scans of 44 patients (26 males, 18 females; mean age, 14.04 ± 3.81 years) with unilateral cleft lip and palate (UCLP) were assessed to define dehiscences and fenestrations of the anterior teeth in both cleft and noncleft sides of the UCLP patients and a control group of noncleft patients (51 patients; 21 males, 30 females; mean age, 14.52 ± 1.16 years). Data were analyzed using Pearson’s χ2 and Student’s t-test. Results:  The prevalence of dehiscences at the maxillary central incisors, lateral incisors, and canines teeth were 43.2%, 70.6%, and 34.1% on the cleft side and 22.7%, 53.1%, and 27.3% on the noncleft side of UCLP patients, and 13.7%, 7.8%, and 13.7% in controls, respectively (statistically no difference between the sides of cleft patients). The cleft patients had a statistically significantly higher prevalence of dehiscences than did the controls on both the cleft and noncleft sides (P &lt; .05), except for the maxillary central incisors. Fenestrations for these teeth were significantly more common on the cleft side in UCLP patients compared with controls (P &lt; .05), whereas the difference for maxillary lateral incisors was not statistically significant. Conclusions:  Patients with UCLP showed a higher prevalence of dehiscence and fenestration defects around the maxillary anterior teeth.

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