scholarly journals Cone Beam Computed Tomography 3D Reconstruction of the Mandibular Condyle

2008 ◽  
Vol 78 (5) ◽  
pp. 880-888 ◽  
Author(s):  
Brian Schlueter ◽  
Ki Beom Kim ◽  
Donald Oliver ◽  
Gus Sortiropoulos
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
3D Reconstruction ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Mandibular Condyle ◽  
Cone Beam ◽  
Low Density ◽  
Mineral Density ◽  
Linear Measurements

Abstract Objective: To determine the ideal window level and width needed for cone beam computed three-dimensional (3D) reconstruction of the condyle. Materials and Methods: Linear dimensions were measured with a digital caliper to assess the anatomic truth for 50 dry human mandibular condyles. Condyles were scanned with the i-CAT cone beam computed tomography (CBCT) and 3D-models were reconstructed. Three linear three-dimensional measurements were made on each of the 50 condyles at 8 different Hounsfield unit (HU) windows. These measurements were compared with the anatomic truth. Volumetric measurements were also completed on all 50 condyles, at 23 different window levels, to define the volumetric distribution of bone mineral density (BMD) within the condyle. Results: Significant differences were found in two of the three linear measurement groups at and below the recommended viewing window for osseous structures. The most accurate measurements were made within the soft tissue range for HU window levels. Volumetric distribution measurements revealed that the condyles were mostly comprised of low-density bone, and that condyles exhibiting significant changes in linear measurements were shown to have higher percentages of low-density bone than those condyles with little change from the anatomic truth. Conclusions: CBCT assessment of the mandibular condyle, using the 3D reconstruction, is most accurate when accomplished at density levels below that recommended for osseous examination. However, utilizing lower window levels which extend into the soft tissue range, may compromise one's capacity to view the bony topography.

scholarly journals Accuracy and Reproducibility of Facial Measurements of Digital Photographs and Wrapped Cone Beam Computed Tomography (CBCT) Photographs

Diagnostics ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 757
Author(s):  
Maged Sultan Alhammadi ◽  
Abeer Abdulkareem Al-mashraqi ◽  
Rayid Hussain Alnami ◽  
Nawaf Mohammad Ashqar ◽  
Omar Hassan Alamir ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Cone Beam Computed Tomography ◽  
High Reliability ◽  
Three Dimensional ◽  
Cone Beam ◽  
Cross Sectional ◽  
Facial Profile ◽  
Digital Photographs ◽  
Gonial Angle

The study sought to assess whether the soft tissue facial profile measurements of direct Cone Beam Computed Tomography (CBCT) and wrapped CBCT images of non-standardized facial photographs are accurate compared to the standardized digital photographs. In this cross-sectional study, 60 patients with an age range of 18–30 years, who were indicated for CBCT, were enrolled. Two facial photographs were taken per patient: standardized and random (non-standardized). The non-standardized ones were wrapped with the CBCT images. The most used soft tissue facial profile landmarks/parameters (linear and angular) were measured on direct soft tissue three-dimensional (3D) images and on the photographs wrapped over the 3D-CBCT images, and then compared to the standardized photographs. The reliability analysis was performed using concordance correlation coefficients (CCC) and depicted graphically using Bland–Altman plots. Most of the linear and angular measurements showed high reliability (0.91 to 0.998). Nevertheless, four soft tissue measurements were unreliable; namely, posterior gonial angle (0.085 and 0.11 for wrapped and direct CBCT soft tissue, respectively), mandibular plane angle (0.006 and 0.0016 for wrapped and direct CBCT soft tissue, respectively), posterior facial height (0.63 and 0.62 for wrapped and direct CBCT soft tissue, respectively) and total soft tissue facial convexity (0.52 for both wrapped and direct CBCT soft tissue, respectively). The soft tissue facial profile measurements from either the direct 3D-CBCT images or the wrapped CBCT images of non-standardized frontal photographs were accurate, and can be used to analyze most of the soft tissue facial profile measurements.

scholarly journals Correlation between the position of hyoid bone and subregions of the pharyngeal airway space in lateral cephalometry and cone beam computed tomography

2017 ◽  
Vol 87 (5) ◽  
pp. 688-695
Author(s):  
Eliana Dantas da Costa ◽  
Gina Delia Roque-Torres ◽  
Danieli Moura Brasil ◽  
Frab Noberto Bóscolo ◽  
Solange Maria de Almeida ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Hyoid Bone ◽  
Three Dimensional ◽  
Cone Beam ◽  
Linear Measurements ◽  
3D Reconstructions ◽  
Pharyngeal Airway ◽  
Triangle Method ◽  
Volumetric Measurements

ABSTRACT Objective: To correlate the pharyngeal airway subregions with the positioning of the hyoid bone. Material and Methods: The study examined 107 lateral cephalometric (LC) and cone beam computed tomography (CBCT) images. Linear and volumetric measurements of the pharyngeal subregions were made and correlated to linear measurements using hyoid triangle analysis on images of LC and multiplanar (MPR) and three-dimensional (3D) reconstructions of CBCT. Results: There was significant correlation between linear measurements of the pharyngeal subregions and hyoid bone position in LC images and in MPR and 3D reconstructions of the CBCT. Correlations were more frequent in the oropharynx and hypopharynx, especially for LC images. No correlations were observed between LC images or CBCT reconstructions and the volumetric measurements of the pharyngeal subregions and the position of the hyoid bone. Conclusion: The hyoid bone position showed more correlations with oropharynx and hypopharynx airway measurements. The hyoid triangle method was not applicable to 3D images, since it showed a smaller number of measures correlated to the hyoid bone position.

ACURÁCIA DAS MEDIDAS LINEARES NOS MODELOS 3D, A PARTIR DA TOMOGRAFIA COMPUTADORIZADA POR FEIXE CÔNICO

2018 ◽  
Author(s):  
Renan Alves Rebouças
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Literature Review ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
3D Models ◽  
Cone Beam ◽  
Multiplanar Reconstruction ◽  
Linear Measurements ◽  
3D Images

RESUMOO objetivo deste trabalho foi avaliar a acurácia das medidas lineares nos modelos 3D, a partir da tomografia computadorizada por feixe cônico, através da revisão de literatura. Foram pesquisados artigos científicos indexados na base de dados PubMed, entre os anos de 2006 a 2014, utilizando-se as palavras-chave: acurácia, confiabilidade, medidas lineares, tomografia computadorizada por feixe cônico, resultando na análise de 12 artigos. A tomografia computadorizada por feixe cônico (TCFC) fornece imagens em três dimensões (3D) – cortes tomográficos multiplanares (RMP) precisos e de alta resolução, a uma dose de radiação relativamente baixa. As medidas lineares realizadas nos modelos 3D, a partir da tomografia computadorizada por feixe cônico, são acuradas, independentemente da resolução do voxel.Palavras-chave: Acurácia. Confiabilidade. Medidas lineares. Tomografia computadorizada por feixe cônico.ABSTRACTThe objective of this study was to evaluate the accuracy of the linear measurements on 3D models, from cone beam computed tomography, through a literature review. Scientific articles indexed in the database PubMed were searched, between 2006 to 2014, using the keywords: accuracy, reliability, linear measurements, cone beam computed tomography, resulting in a total of 12 analysed articles. Cone beam computed tomography (CBCT) provide three-dimensional (3D) images – accurate and high resolution multiplanar reconstruction (MPR), with reduced radiation dosages. Linear measurements on the 3D models, from the CBCT scan, are accurate, regardless of the resolution of the voxel.Keywords: Accuracy. Reliability. Linear measurements. Cone beam computed tomography.

3D Reconstructions from Few Projections in Oral Radiology

2010 ◽  
pp. 108-121
Author(s):  
Ralf K.W. Schulze
Keyword(s):  
Computed Tomography ◽  
Information Technology ◽  
3D Reconstruction ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Cone Beam ◽  
Oral Radiology ◽  
Reconstruction Problem ◽  
3D Reconstructions ◽  
X Ray

Established techniques for three-dimensional radiographic reconstruction such as computed tomography (CT) or, more recently cone beam computed tomography (CBCT) require an extensive set of measurements/ projections from all around an object under study. The x-ray dose for the patient is rather high. Cutting down the number of projections drastically yields a mathematically challenging reconstruction problem. Few-view 3D reconstruction techniques commonly known as “tomosynthetic reconstructions” have gained increasing interest with recent advances in detector and information technology.

scholarly journals CEPHALOMETRIC SKELETAL COMPARATIVE ANALYSIS BETWEEN LEFT AND RIGHT SIDE OF SKULL FOR TWO AGE GROUPS PATIENTS WITH CLASS ONE MALOCCLUSION BY THREE DIMENSIONAL CONE-BEAM COMPUTED TOMOGRAPHY

2020 ◽  
pp. 57-63
Author(s):  
Al-cablany Ebrahem Hezam ◽  
O.M. Makarova ◽  
V.D. Kuroiedova
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Age Groups ◽  
Three Dimensional ◽  
Cone Beam ◽  
Linear Measurements ◽  
Class 1 ◽  
Left And Right ◽  
Pre Treatment ◽  
Two Age Groups

Objective: The purpose of our research was to study comparative cephalometric analysis between left and right sides of head and evaluate the skeletal facial symmetry in patients with class 1 malocclusion by 3D Cone-beam computed tomography (CBCT). Materials and Methods: Pre-treatment by 3D Cone-beam computed tomography radiographs for 20 patients of two age groups with class 1 malocclusion was undergone for 11 angular and 4 liner measurements from right and left sides, anteroposterior, vertical and frontal view by hand except the hard landmarks determination. Chi-test was used to compare the result of both sides (P < 0.05). Results: No difference was found between left and right analysis for linear measurements as for the angular cephalometric measurements. Conclusion: Measurements of skeletal analysis by 3D CBCT cephalograms from right side were found to be similar to left side. So, we can use the left analysis for orthodontics diagnosis as right side. Also, the both sides analysis can be used for symmetric analysis reasons.

scholarly journals Morphological Assessment of TMJ Spaces, Mandibular Condyle, and Glenoid Fossa Using Cone Beam Computed Tomography (CBCT): A Retrospective Analysis

2021 ◽  
Author(s):  
Junaid Ahmed ◽  
Nanditha Sujir ◽  
Nandita Shenoy ◽  
Almas Binnal ◽  
Ravikiran Ongole ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Imaging Modality ◽  
Mandibular Condyle ◽  
Cone Beam ◽  
Glenoid Fossa ◽  
Linear Measurements ◽  
Length Width ◽  
Cbct Analysis ◽  
Condylar Volume

Abstract Background The temporomandibular joint (TMJ) is included in the category of ginglymoarthrodial synovial joints. The mandibular condyle plays a vital part in the development of the craniofacial complex. Hence, the evaluation and assessment of the condylar volume and its morphology are of utmost importance. Aim The aim of this research was to use cone beam computed tomography (CBCT) imaging modality to evaluate the morphology of the mandibular condyle and glenoid fossa in a selected population and document any morphometric changes. Setting and Design It is an observational study. Materials and Methods A retrospective CBCT analysis was performed on 119 patients. The length, width, height, linear measurements of the joint spaces (anterior, posterior, and superior), volume of the condyle, and roof of glenoid fossa thickness were evaluated on both the left and right sides in both males and females. Results The height, width, and length of mandibular condyle were significantly increased in males on both sides. Except for the left anterior space, all other spaces were significantly larger in males. Overall, the volume of the condyles in males was significantly increased on both sides. Conclusion CBCT can be a valuable diagnostic aid in the evaluation of various dimensions, joint spaces, and condylar volume in different planes and thus, can be a useful predictor in the assessment of treatment outcomes of disorders affecting the TMJ.

scholarly journals Temporomandibular Joint Osseous Morphology of Class I and Class II Malocclusions in the Normal Skeletal Pattern: A Cone-Beam Computed Tomography Study

Diagnostics ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 541
Author(s):  
Xiao-Chuan Fan ◽  
Lin-Sha Ma ◽  
Li Chen ◽  
Diwakar Singh ◽  
Xiaohui Rausch-Fan ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Temporomandibular Joint ◽  
Cone Beam Computed Tomography ◽  
Class Ii ◽  
Class I ◽  
Cone Beam ◽  
Glenoid Fossa ◽  
Linear Measurements ◽  
Significant Difference ◽  
Skeletal Pattern

(1) Background—The aim of the present study was to evaluate the correlation between the temporomandibular joint (TMJ) osseous morphology of normal skeletal pattern individuals with different dental malocclusions by using cone-beam computed tomography (CBCT). (2) Methods—The CBCT images of bilateral TMJs in 67 subjects with skeletal class I and average mandibular angle (26 males and 41 females, age range 20–49 years) were evaluated in this study. The subjects were divided into class I, class II division 1, and class II division 2 according to the molar relationship and retroclination of the maxillary incisors. Angular and linear measurements of TMJ were evaluated and the differences between the groups were statistically analyzed. (3) Results—Intragroup comparisons showed statistical differences for articular eminence inclination, the width of the glenoid fossa, the ratio of the width of the glenoid fossa to the depth of the glenoid fossa, the condylar angle, and the intercondylar angle between the malocclusion groups. The measurements of the glenoid fossa shape showed no significant difference between the left and right sides. Females showed more differences in the morphological parameters of TMJ between the three malocclusion groups than the males. (4) Conclusion—The present study revealed differences in the TMJ osseous morphology between dental class I and class II malocclusions in the normal skeletal pattern.

scholarly journals Applications of cone beam computed tomography in endodontics

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Ateksha Bhardwaj Khanna
Keyword(s):  
Computed Tomography ◽  
Treatment Planning ◽  
Cone Beam Computed Tomography ◽  
Oral Surgery ◽  
Three Dimensional ◽  
Conventional Radiography ◽  
Cone Beam ◽  
Oral Radiology ◽  
Manual Search ◽  
First Choice

Abstract Background Endodontic disease can adversely affect the quality of life and therefore early diagnosis and consequent timely treatment is of paramount importance for the Endodontist. Radiology is an essential component in treatment planning, disease monitoring and assessment of treatment outcome. Periapical radiographs and panoramic radiography are frequently utilised but they provide only two-dimensional representation of three-dimensional structures. The advent of cone beam computed tomography (CBCT) offers three-dimensional accuracy of the hard tissue images with a reasonable cost and this has revolutionised imaging of the dentomaxillofacial structures. This imaging system has been seen to overcome some limitations of conventional radiography, as brought out in this review. The improvement in the accuracy is, however, accompanied at the cost of increased radiation exposure to the patient. Nevertheless, smaller areas of exposure are normally appropriate for endodontic imaging, and adjustment in the exposure parameters can further moderate the effective dose (Loubele et al. 37(6):309-18, 2008). Aims and objectives The aim of this review is to present the pertinent literature on the various applications of cone beam computed tomography in the field of endodontics. Methods Literature was electronically searched on the following sources; Medline and Keats Library. Further, a manual search was performed on the following journals: International Endodontic Journal, Journal of Endodontics, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, Endodontology, Journal of Dental Research, European Journal of Oral Sciences & Odontology and Dentomaxillofacial Radiology. A preliminary search was performed to gain an idea of the available literature using keywords ‘Cone Beam Computed Tomography’ to view the volume of the literature evident and identify questions to be addressed in this review. The initial search showed 243 potential articles. After scrutinising the titles and abstracts of the retrieved articles, 70 relevant studies were reviewed in full text. Furthermore, ‘published guidelines on the use of CBCT’ were also searched so as to include the results as an additional source material. All the articles eligible to be included in the review were in the English language and ranged from the year 1960 to the present. Also all the studies reviewed were based on the various uses of cone beam computed tomography in the field of endodontics. The keywords used to search were ‘Cone Beam Computed Tomography (CBCT)’, ‘Conventional radiography’, ‘Applications of CBCT in endodontics’, ‘CBCT and tooth morphology’, ‘CBCT and apical periodontitis’, ‘CBCT and vertical root fractures’, ‘CBCT and resorption’, ‘CBCT and pre-surgical assessment’, ‘CBCT and dento-alveolar trauma’ and ‘CBCT and endodontic outcome’. Results Every case is unique and CBCT should be considered only after studying each case individually. CBCT imaging needs to be adopted or used where information from conventional imaging systems is either inadequate for the management of endodontic problems or inconclusive. Having said that, it is safe to state that CBCT imaging has the potential to become the first choice for endodontic treatment planning and outcome assessment, especially when new scanners with lower radiation doses and enhanced resolution would be available.

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