scholarly journals Detectability of Osseous Lesions with a Pre-Programmed Low-Dose Protocol for Cone-Beam Computed Tomography

2020 ◽  
Vol 10 (14) ◽  
pp. 4961
Author(s):  
Quirin Döbelin ◽  
Bernd Stadlinger ◽  
Daniel B. Wiedemeier ◽  
Dominique Bichsel ◽  
Martin Rücker ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Low Dose ◽  
Standard Dose ◽  
Correct Diagnosis ◽  
Three Dimensional ◽  
Cone Beam ◽  
Diagnostic Reliability ◽  
Significant Difference ◽  
User Friendly

The present study aimed to compare the diagnostic reliability of a pre-set, manufacturer-specific, low-dose mode against a standard-dose mode in the detection of four different osseous lesions in the mandible with cone-beam computed tomography (CBCT). Four types of lesions (periapical lesion, extended periodontal gap, recession of the buccal lamella, sequestrum/fracture) were prepared on 40 pig mandibles. CBCT images were obtained from each mandible, with both the low-dose and standard-dose modes using the Orthophos SL CBCT device (Dentsply-Sirona, Bensheim, Germany). Twelve assessors quantitatively (detection of lesions) and qualitatively (assessment of detectability) evaluated the CBCT images in SIDEXIS 4 (Dentsply-Sirona) using a study-specific digital examination tool. A correct diagnosis was achieved in almost 71% (LD: 70.8%; SD: 70.9%) of 1920 lesions, without a statistically significant difference between the low-dose and standard-dose mode. This finding was consistent across all four lesion types. In conclusion, while low-dose mode and standard-dose mode CBCT scans performed similarly in the detection of four prepared lesions of the mandible, the former may be a promising, user-friendly alternative method of obtaining radiation-optimized, three-dimensional images in accordance with the As Low As Diagnostically Acceptable (ALADA) principle.

scholarly journals Diagnostic Accuracy of Cystic Lesions Using a Pre-Programmed Low-Dose and Standard-Dose Dental Cone-Beam Computed Tomography Protocol: An Ex Vivo Comparison Study

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7402
Author(s):  
Adib Al-Haj Husain ◽  
Quirin Döbelin ◽  
Barbara Giacomelli-Hiestand ◽  
Daniel B. Wiedemeier ◽  
Bernd Stadlinger ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Low Dose ◽  
Standard Dose ◽  
Lesion Size ◽  
Cone Beam ◽  
Cystic Lesions ◽  
Diagnostic Reliability ◽  
Imaging Protocol ◽  
Promising Alternative

Background: This study aimed to analyze the diagnostic reliability of radiographic assessment of cystic lesions using a pre-set, manufacturer-specific, low-dose mode compared to a standard-dose dental cone-beam computed tomography (CBCT) imaging protocol. Methods: Forty pig mandible models were prepared with cystic lesions and underwent both CBCT protocols on an Orthophos SL Unit (Dentsply-Sirona, Bensheim, Germany). Qualitative and quantitative analysis of CBCT data was performed by twelve investigators independently in SIDEXIS 4 (Dentsply-Sirona) using a trial-specific digital examination software tool. Thereby, the effect of the two dose types on overall detectability rate, the visibility on a scale of 1 (very low) to 10 (very high) and the difference between measured radiographic and actual lesion size was assessed. Results: Low-dose CBCT imaging showed no significant differences considering detectability (78.8% vs. 81.6%) and visibility (9.16 vs. 9.19) of cystic lesions compared to the standard protocol. Both imaging protocols performed very similarly in lesion size assessment, with an apparent underestimation of the actual size. Conclusion: Low-dose protocols providing confidential diagnostic evaluation with an improved benefit–risk ratio according to the ALADA principle could become a promising alternative as a primary diagnostic tool as well as for radiological follow-up in the treatment of cystic lesions.

scholarly journals Evaluation of mandibular volume classified by vertical skeletal dimensions with cone-beam computed tomography

2016 ◽  
Vol 86 (6) ◽  
pp. 949-954 ◽  
Author(s):  
Takatoshi Nakawaki ◽  
Tetsutaro Yamaguchi ◽  
Daisuke Tomita ◽  
Yu Hikita ◽  
Mohamed Adel ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Cone Beam ◽  
Class Iii ◽  
Tomographic Images ◽  
Computed Tomographic ◽  
Significant Difference ◽  
Detailed Assessment ◽  
Lateral Cephalometry

ABSTRACT Objective: To investigate the relationship between anteroposterior and vertical differences in maxillofacial morphology and mandibular volume. Materials and Methods: Subjects comprised 213 Japanese adults (84 males and 129 females) who were divided into three groups based on mandibular basal arch (ANB) and Wits, measured in a cephalometric analysis: Class I (−1° ≤ ANB < 4°,−1 mm ≤ Wits < 0 mm), Class II (ANB ≥ 4°, Wits ≥ 0), and Class III (ANB <−1°, Wits <−1 mm). Subjects were also divided into three groups based on the mandibular plane angle (Mp), as follows: hypodivergent (Mp < 23°), normodivergent (Mp  =  23–30°), and hyperdivergent (Mp > 30°) groups. Mandibular volume was measured from cone-beam computed tomographic images that were analyzed using Analyze™ image processing software and compared among the three groups in each classification. Results: No significant differences were noted in mandibular volume among Classes I, II, and III. An inverse relationship was found between mandibular volume and Mp, and a significant difference was noted in mandibular volume between the hypodivergent and hyperdivergent groups. Conclusions: In addition to two-dimensional analysis, such as lateral cephalometry, three-dimensional information such as volume, provided by cone-beam computed tomography, contributes to a more detailed assessment of maxillofacial morphology.

scholarly journals Facial Flatness Indices: A Comparison of Two Methods of Assessment

2020 ◽  
Vol 10 ◽  
pp. 68
Author(s):  
Chimène Chalala ◽  
Maria Saadeh ◽  
Fouad Ayoub
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Cone Beam ◽  
Class Iii ◽  
Direct Measurements ◽  
Significant Difference ◽  
Males And Females ◽  
Trigonometric Formula

Objectives: The objective of the study was to evaluate and compare facial flatness indices calculated from the trigonometric formula as opposed to those generated from the direct measurements on three-dimensional radiographs. Material and Methods: A total of 322 cone-beam computed tomography radiographs were digitized and three facial indices (frontal, simotic, and zygomaxillary) were assessed in two different methods and compared between different groups. Results: There was a discrepancy between facial flatness indices generated from the two different approaches. The highest difference was seen in the findings of the simotic index and the lowest for the zygomaxillary index. No statistically significant difference was displayed in the three formula-generated flatness indices between males and females and between growing and non-growing subjects (P > 0.05). The zygomaxillary index was the only measurement revealing no statistically significant difference in Class III sagittal malocclusions (t = −0.5 P = 0.621). The orthodontic application would yield to the same interpretations for both ways of indices calculation. Conclusion: The validity of the trigonometric formula used to appraise facial flatness indices might be questionable. The zygomaxillary index could be more clinically considered compared to the frontal and simotic indices.

scholarly journals Evaluation of skin doses for cone-beam computed tomography in dentomaxillofacial imaging: A preclinical study

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0254510
Author(s):  
Carolin Sophie Reidelbach ◽  
Jakob Neubauer ◽  
Maximilian Frederik Russe ◽  
Jan Kusterer ◽  
Wiebke Semper-Hogg
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Standard Dose ◽  
Repeated Measurements ◽  
Cone Beam ◽  
High Dose ◽  
Parotid Glands ◽  
Organ Doses ◽  
Significant Difference ◽  
Skin Doses

Purpose Evaluation of skin organ doses in six different cone-beam computed tomography scanners (CBCT) dedicated to dentomaxillofacial imaging. Our hypothesis is that the dose varies between different devices, protocols and skin areas. Materials and methods An anthropomorphic adult head and neck phantom was used to which a dosimeter (Waterproof Farmer® Chamber, PTW, Freiburg, Germany) was attached to anatomic landmarks of both parotid glands, both ocular lenses, the thyroid gland and the neurocranium. CBCT examinations were performed on six different CBCT devices dedicated to dentomaxillofacial imaging with standard settings and, if available, also in high dose settings. Measurements were repeated five times each. Results The measured mean skin doses ranged from 0.48 to 2.21 mGy. The comparison of the region based dose evaluation showed a high correlation between the single measurements. Furthermore, the distribution of doses between regions was similar in all devices, except that four devices showed side differences for the dose of the parotid region and one device showed side differences for the lens region. The directly exposed regions, such as the parotid glands, showed significant higher values than the more distant regions like the neurocranium. When comparing examination protocols, a significant difference between the standard dose and the high dose acquisitions could be detected. But also a significant dose difference between the different CBCTs could be shown. 3D Accuitomo 170 (Morita, Osaka, Japan) showed the highest absorbed mean dose value for standard settings with 2.21 mGy, especially at the directly exposed regions and their adjacent organs. The lowest mean value for standard settings was achieved with VGi evo (NewTom, Verona, Italy) with 0.48 mGy. Conclusion Repeated measurements of skin organ doses in six different CBCT scanners using a surface dosimeter showed side differences in distribution of dose in five devices for the parotid and lens region. Additionally, significant dose differences between the devices could be detected. Further studies should be performed to confirm these results.

scholarly journals Determination of Age and Sex Using Bimastoid Diameter: a Cone Beam Computed Tomography Study

2021 ◽  
pp. 388-394
Author(s):  
Özlem Okumuş
Keyword(s):  
Computed Tomography ◽  
Sex Determination ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Population Data ◽  
High Rate ◽  
Cone Beam ◽  
Mastoid Process ◽  
Significant Difference ◽  
Age And Sex

This study aimed to investigate the possibility of age and sex determination using bimastoid diameter with cone-beam computed tomography (CBCT). This retrospective study investigated 100 female and 100 male patients aged 18-83 years (mean age: 45.55±16.28 years). To measure bimastoid diameter, the appropriate image was chosen from sagittal, coronal, and axial images of CBCT in which the measurement points could be best detected. The distance between the points of the mastoid process was measured using three-dimensional coronal reconstruction. The mean bimastoid breadth was 106.12±6.22mm. The bimastoid diameter in male cases was higher than that in female cases (110.69±4.53mm vs. 101.65±4.00mm). There was no significant difference in bimastoid breadth with advancing age. For sex determination, morphometric measurements of bimastoid diameter ensured a high rate of dimorphism in the Turkish subpopulation. CBCT morphometric analysis may be reliable and convenient for evaluating sex and may be recommended to compare population data.

scholarly journals Use of Cone Beam Computed Tomography in Endodontics

2009 ◽  
Vol 2009 ◽  
pp. 1-20 ◽  
Author(s):  
William C. Scarfe ◽  
Martin D. Levin ◽  
David Gane ◽  
Allan G. Farman
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Low Dose ◽  
Imaging Modality ◽  
Three Dimensional ◽  
Field Of View ◽  
Cone Beam ◽  
Small Field ◽  
Endodontic Diagnosis ◽  
Small Field Of View

Cone Beam Computed Tomography (CBCT) is a diagnostic imaging modality that provides high-quality, accurate three-dimensional (3D) representations of the osseous elements of the maxillofacial skeleton. CBCT systems are available that provide small field of view images at low dose with sufficient spatial resolution for applications in endodontic diagnosis, treatment guidance, and posttreatment evaluation. This article provides a literature review and pictorial demonstration of CBCT as an imaging adjunct for endodontics.

scholarly journals Accuracy of linear measurements using low dose cone beam computed tomography protocol versus direct skull linear measurements: An in vitro study

F1000Research ◽  
2019 ◽  
Vol 8 ◽  
pp. 25
Author(s):  
Nora Aly Al Abbady ◽  
Reham Mohamed Hamdy ◽  
Sahar Hosny El Dessouky
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Low Dose ◽  
In Vitro Study ◽  
Cone Beam ◽  
High Dose ◽  
Anatomical Landmarks ◽  
Linear Measurements ◽  
Significant Difference

Background: Cone beam computed tomography (CBCT) imaging has been widely used for different dental applications over the last few years. It delivers a high dose of radiation compared to conventional imaging modalities. This study aimed to compare the accuracy of linear measurements conducted using a low dose CBCT protocol in comparison with direct skull linear measurements. Methods: Ten dry human skulls were included in the study. 12 linear measurements were measured directly on each skull between 23 chosen anatomical landmarks using a digital calliper. Radio-opaque markers were then glued on these anatomical landmarks. Each skull was then scanned using low dose CBCT protocol operated at 90 kVp, 7.1 mA, for 9 sec. Results: There was no statistically significant difference in the accuracy of linear measurements conducted using the low dose CBCT protocol when compared with direct linear measurements. Relative Dahlberg Error value ranged from 0.8% to 1.9%. Conclusion: Reducing mAs using a low dose CBCT protocol does not affect the accuracy of linear measurements used in craniofacial imaging tasks as compared with those taken directly on the skull by a digital calliper.

scholarly journals Determination & comparison of maxillary first premolar pulp chamber landmarks using intraoral periapical radiograph and cone-beam computed tomography

2019 ◽  
Vol 9 (4) ◽  
pp. 2-5
Author(s):  
Neera Joshi Amatya ◽  
Kranti Prajapati ◽  
Suraj Shrestha ◽  
Sharada Wagle
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Process Analysis ◽  
Three Dimensional ◽  
Cone Beam ◽  
Pulp Chamber ◽  
Group I ◽  
Significant Difference ◽  
Iatrogenic Damage ◽  
Group Ii

Background: Dimension and location of pulp chamber are important during access cavity preparation. It allows clinician in instruments selection, orientation and depth of cutting dur­ing the process. Analysis of these has been done in preoperative intraoral periapical radio­graph that gives two-dimensional image. The radiograph has been blamed now and then for the inaccurate results and iatrogenic damage occurred due to the inaccurate results. Cone-Beam Computed Tomography (CBCT) provides three-dimensional images and is taken as standard. Hence the aim of the study is to compare intra-oral periapical (IOPA) radiograph and CBCT to determine the landmarks for accurate results Methods: 50 intact two-rooted maxillary first premolars were collected and numbered. Peri­apical radiograph Images and CBCT images of these 50 teeth were taken and divided as; Group I: 50 IOPAR and Group II: 50 CBCT images. Landmarks marking and measurement was done using tracing paper and x-ray viewer for IOPA images and Planmeca Romexis software for CBCT images. Data were collected and analysed with descriptive and inferential statistics by using Statistical Package of Social Science (SPSS) software version 16. Results: The averages of group I are 7.44, 10.23mm 14.33mm, 4.1mm, 6.89mm and 2.79mm respectively. The averages of in group II are 6.95mm, 9.58mm, 14.03mm, 4.45mm, 7.07mm and 2.63mm respectively. There is statistically significant difference in measurement A and measurement B between group I and group II. Conclusions:  This indicates that there are chances of overestimation of measurement A and B with IOPAR.

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