Accuracy of laser-scanned models compared to plaster models and cone-beam computed tomography

ABSTRACT Objective: To compare the accuracy of measurements obtained from the three-dimensional (3D) laser scans to those taken from the cone-beam computed tomography (CBCT) scans and those obtained from plaster models. Materials and Methods: Eighteen different measurements, encompassing mesiodistal width of teeth and both maxillary and mandibular arch length and width, were selected using various landmarks. CBCT scans and plaster models were prepared from 60 patients. Plaster models were scanned using the Ortho Insight 3D laser scanner, and the selected landmarks were measured using its software. CBCT scans were imported and analyzed using the Avizo software, and the 26 landmarks corresponding to the selected measurements were located and recorded. The plaster models were also measured using a digital caliper. Descriptive statistics and intraclass correlation coefficient (ICC) were used to analyze the data. Results: The ICC result showed that the values obtained by the three different methods were highly correlated in all measurements, all having correlations >0.808. When checking the differences between values and methods, the largest mean difference found was 0.59 mm ± 0.38 mm. Conclusions: In conclusion, plaster models, CBCT models, and laser-scanned models are three different diagnostic records, each with its own advantages and disadvantages. The present results showed that the laser-scanned models are highly accurate to plaster models and CBCT scans. This gives general clinicians an alternative to take into consideration the advantages of laser-scanned models over plaster models and CBCT reconstructions.

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Evaluation of dehiscences using cone beam computed tomography

The Angle Orthodontist ◽

10.2319/020911-95.1 ◽

2011 ◽

Vol 82 (1) ◽

pp. 122-130 ◽

Cited By ~ 13

Author(s):

Nicholas Ising ◽

Ki Beom Kim ◽

Eustaquio Araujo ◽

Peter Buschang

Keyword(s):

Computed Tomography ◽

Systematic Error ◽

Cone Beam Computed Tomography ◽

Intraclass Correlation ◽

Three Dimensional ◽

Cone Beam ◽

Surface Rendering ◽

Voxel Size ◽

Method Error ◽

Computed Tomography Scans

Abstract Objective: To validate the use of three-dimensional (3-D) surface rendering (SR) images to quantify the height of alveolar dehiscences. Materials and Methods: Twenty-four dehiscences were created on 9 incisors, 9 canines, and 6 premolars on 4 cadaver skulls. i-CAT cone beam computed tomography scans (CBCTs) were taken of each skull at .2 mm voxel size. Each dehiscence was quantified by 21 orthodontic residents using 3-D SR. The principal investigator (PI) also quantified each dehiscence using the 2-D multiplanar (MP) image and the 3-D SR image. Results: Results of this study showed an average method error of the residents as a group to be 0.57 mm with an intraclass correlation (ICC) of 0.77%. Residents' method error ranged from 0.45 mm to 1.32 mm, and the ICC ranged from 0.201% to 0.857%. Systematic error was low at −0.01 mm for the direct measurement compared with the residents' average 3-D SR at 1365 density value (DV) measurement. The 3-D SR at 1365 DV images were compared with the MP and 3-D SR images at 1200 DV, and no significant differences in measurements and low systematic error were noted. The method error of the PI was 0.45 mm, 0.45 mm, and 0.41 mm for 3-D SR at 1365 DV, 3-D SR at 1200 DV, and 2-D MP, respectively. Conclusions: 3-D SR and 2D MRP can be used to measure dehiscences of the periodontium with similar levels of accuracy.

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Three-dimensional accuracy of measurements made with software on cone-beam computed tomography images

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2006.08.024 ◽

2008 ◽

Vol 134 (1) ◽

pp. 112-116 ◽

Cited By ~ 122

Author(s):

Manuel O. Lagravère ◽

Jason Carey ◽

Roger W. Toogood ◽

Paul W. Major

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Three Dimensional ◽

Dimensional Accuracy ◽

Cone Beam ◽

Computed Tomography Images ◽

Accuracy Of Measurements

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

Diagnostics ◽

10.3390/diagnostics11050757 ◽

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.

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Applications of cone beam computed tomography in endodontics

Evidence-Based Endodontics ◽

10.1186/s41121-020-00020-4 ◽

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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