Tooth and root size as determined from 0.25- and 0.30-mm voxel size cone-beam CT imaging when contrasted to micro-CT scans (0.06 mm): An ex vivo study

2021 ◽  
pp. 146531252110661
Author(s):  
Gaston F Coutsiers Morell ◽  
Yuli Berlin-Broner ◽  
Carlos Flores-Mir ◽  
Giseon Heo
Keyword(s):  
Repeated Measures ◽  
Root Resorption ◽  
Ex Vivo ◽  
Imaging Modality ◽  
Cone Beam Ct ◽  
Three Dimensional ◽  
Cone Beam ◽  
Micro Ct ◽  
Voxel Size ◽  
Ex Vivo Study

Objective: To quantify tooth volume differences from extracted teeth when using three different three-dimensional (3D) computed tomography (CT)-based imaging modalities. Design: Ex vivo study. Setting: Laboratory and clinics of the University of Alberta. Methods: Cone-beam CT (CBCT) of 12 extracted teeth were scanned using 0.25- and 0.30-mm voxel size from CBCT and a 0.06-mm voxel size from micro-CT (reference standard). 3D reconstructions for each tooth from each imaging modality were made through the software ITK-SNAP®. The mean volume differences between each pair of scanning modalities were calculated and then compared and analysed through a repeated measures ANOVA. Results: The average overestimations of the teeth volume were 15.2% for the high-resolution CBCT and 28.1% for the low-resolution CBCT compared to micro-CT measurements. The differences in absolute volume were 81.6 mm3 and 152.8 mm3, respectively. All differences were statistically significant ( P < 0.05). Conclusions: Orthodontists and researchers who assess root resorption through CBCT imaging should be aware that the depicted volumes may likely be overestimating tooth volume and camouflaging real root volumetric treatment changes.

Inaccuracy of buccal bone thickness estimation on cone‐beam CT due to implant blooming: An ex‐vivo study

2019 ◽  
Vol 46 (11) ◽  
pp. 1134-1143 ◽  
Author(s):  
Tony Vanderstuyft ◽  
Mihai Tarce ◽  
Bahoz Sanaan ◽  
Reinhilde Jacobs ◽  
Karla de Faria Vasconcelos ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Bone Thickness ◽  
Thickness Estimation ◽  
Ex Vivo Study

Influence of the exomass on the detection of simulated root fracture in cone-beam ct – an ex-vivo study

2020 ◽  
pp. 20200450
Author(s):  
Amanda Pelegrin Candemil ◽  
Francesca Mangione ◽  
Karla Farias Vasconcelos ◽  
Anne Caroline Oenning ◽  
Reinhilde Jacobs ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Cone Beam Ct ◽  
Receiver Operating Curve ◽  
Cone Beam ◽  
Metallic Materials ◽  
Root Fracture ◽  
Vertical Root Fracture ◽  
Metal Artefacts ◽  
Sensitivity Specificity ◽  
Ex Vivo Study

Objectives: To evaluate the influence of exomass-related metal artefacts on the detection of simulated vertical root fracture (VRF) in cone-beam computed tomography (CBCT). Methods: Twenty teeth were endodontically instrumented and VRF was induced in half of them. All teeth were individually placed in an empty socket of a human mandible. Metallic materials were differently arranged in the exomass [zone outside of the field of view (FOV) but between the X-ray source and the receptor] and/or endomass (zone inside of the FOV), and CBCT scans were obtained. Four radiologists evaluated the presence of VRF using a 5-point scale. Sensitivity, specificity, and area under the receiver operating curve (AUC) were compared using ANOVA. Also, the tooth of interest was replaced with a tube filled with a radiopaque solution and all CBCT scans were repeated to analyse the data objectively. Mean grey and noise values were obtained from the tube and compared using ANOVA followed by Tukey’s test (α = 0.05). Results: Mean grey values were significantly lower and noise was significantly higher when metallic materials were present in the endomass or both the exomass and endomass. Sensitivity, specificity, and AUC were not influenced by the artefacts from the metallic materials irrespective of the arrangement condition. Conclusions: Exomass-related metal artefacts did not influence the diagnosis of simulated VRF in CBCT.

scholarly journals An ex vivo study of automated motion artefact correction and the impact on cone beam CT image quality and interpretability

2018 ◽  
pp. 20180013 ◽  
Author(s):  
Rubens Spin-Neto ◽  
Louise H Matzen ◽  
Lars W Schropp ◽  
Thomas S Sørensen ◽  
Ann Wenzel
Keyword(s):  
Image Quality ◽  
Ex Vivo ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Ct Image ◽  
Motion Artefact ◽  
Ct Image Quality ◽  
The Impact ◽  
Ex Vivo Study ◽  
Artefact Correction

scholarly journals In Vivo Comparison of Conventional and Cone Beam CT Synthesized Cephalograms

2008 ◽  
Vol 78 (5) ◽  
pp. 873-879 ◽  
Author(s):  
Vandana Kumar ◽  
John Ludlow ◽  
Lucia Helena Soares Cevidanes ◽  
André Mol
Keyword(s):  
Repeated Measures ◽  
Cone Beam Ct ◽  
Statistical Significance ◽  
Three Dimensional ◽  
Cone Beam ◽  
Volume Data ◽  
Linear Measurements ◽  
Lateral Cephalograms ◽  
Angular Measurements

Abstract Objective: To compare measurements from synthesized cone-beam computed tomography (CBCT) lateral cephalograms using orthogonal and perspective projections with those from conventional cephalometric radiographs. Materials and Methods: Thirty-one patients were imaged using CBCT and conventional cephalometry. CBCT volume data were imported in Dolphin 3D. Orthogonal and perspective lateral cephalometric radiographs were created from three-dimensional (3D) virtual models. Twelve linear and five angular measurements were made on synthesized and conventional cephalograms in a randomized fashion. Conventional image measurements were corrected for known magnification. Linear and angular measurements were compared between image modalities using repeated measures analysis of variance. Statistical significance was defined as an α level of .01. Results: With the exception of the Frankfort-mandibular plane angle (P &lt; .0001), angular measurements were not statistically different for any modality (P &gt; .01). Linear measurements, whether based on soft or hard tissue landmarks, were not statistically different (P &gt; .01). Conclusions: Measurements from in vivo CBCT synthesized cephalograms are similar to those based on conventional radiographic images. Thus, additional conventional imaging may generally be avoided when CBCT scans are acquired for orthodontic diagnosis.

Three dimensional cone-beam CT sialography in non tumour salivary pathologies: procedure and results

2019 ◽  
Vol 48 ◽  
pp. 226
Author(s):  
H. Bertin ◽  
R. Bonnet ◽  
M. Anquetil ◽  
A.S. Delemazure ◽  
E. Mourrain-Langlois ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Three Dimensional ◽  
Cone Beam ◽  
Dimensional Cone

scholarly journals Comparison of the different voxel sizes in the estimation of peri-implant fenestration defects using cone beam computed tomography: an ex vivo study

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Mehmet Hakan Kurt ◽  
Nilsun Bağış ◽  
Cengiz Evli ◽  
Cemal Atakan ◽  
Kaan Orhan
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Ex Vivo ◽  
Statistical Significance ◽  
Area Under The Curve ◽  
Titanium Implant ◽  
Bone Defects ◽  
Titanium Implants ◽  
Cone Beam ◽  
Voxel Size

Abstract Background To examine the influence of voxel sizes to detect of peri-implant fenestration defects on cone beam computed tomography (CBCT) images. Materials and methods This study performed with three sheep heads both maxilla and mandible and two types of dental implant type 1 zirconium implant (Zr40) (n = 6) and type 2 titanium implant (Ti22) (n = 10). A total of 14 peri-implant fenestrations (8 buccal surfaces, 6 palatal/lingual surface) were created while 18 surfaces (8 buccal, 10 palatal/lingual) were free of fenestrations. Three observers have evaluated the images of fenestration at each site. Images obtained with 0.75 mm3, 0.100 mm3, 0.150 mm3, 0.200 mm3, and 0.400 mm3 voxel sizes. For intra- and inter-observer agreements for each voxel size, Kappa coefficients were calculated. Results Intra- and inter-observer kappa values were the highest for 0.150 mm3, and the lowest in 0.75 mm3 and 0.400 mm3 voxel sizes for all types of implants. The highest area under the curve (AUC) values were found higher for the scan mode of 0.150 mm3, whereas lower AUC values were found for the voxel size for 0.400 mm3. Titanium implants had higher AUC values than zirconium with the statistical significance for all voxel sizes (p ≤ 0.05). Conclusion A voxel size of 0.150 mm3 can be used to detect peri-implant fenestration bone defects. CBCT is the most reliable diagnostic tool for peri-implant fenestration bone defects.

scholarly journals Diagnosis of invasive cervical resorption by using cone beam computed tomography: report of two cases

2012 ◽  
Vol 23 (5) ◽  
pp. 602-607 ◽  
Author(s):  
Karla de Faria Vasconcelos ◽  
Yuri Nejaim ◽  
Francisco Haiter Neto ◽  
Frab Norberto Bóscolo
Keyword(s):  
Computed Tomography ◽  
Differential Diagnosis ◽  
Cone Beam Computed Tomography ◽  
Root Canal ◽  
Root Resorption ◽  
Imaging Modality ◽  
Relevant Information ◽  
Cone Beam ◽  
Short Period ◽  
Radiographic Interpretation

A radiographic interpretation is essential to the diagnosis of invasive cervical resorption (ICR) and the difficulty in distinguishing this lesion from internal root resorption has been highlighted in the literature. This paper reports the use of cone beam computed tomography (CBCT) in the diagnosis of ICR. The cases reports describe how CBCT can be used to make a differential diagnosis and also show that the use of this technology can provide relevant information on the location and nature of root resorption, which conventional radiographs cannot. As a result, the root canal treatment was not initially considered. The patients will be monitored and will undergo a scan after a short period of time to detect any small changes. It was observed that both cases benefited from CBCT in the diagnosis of ICR, because this imaging modality determined the real extent of resorption and possible points of communication with the periodontal space.

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