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Dento Maxillo Facial Radiology

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https://www.readbyqxmd.com/read/30407848/dimensional-accuracy-of-cone-beam-ct-with-varying-angulation-of-the-jaw-to-the-x-ray-beam
#1
George K Koch, Adam Hamilton, Kelly Wang, Laura Herschdorfer, Kyu Ha Lee, German O Gallucci, Bernard Friedland
OBJECTIVES: Cone beam CT (CBCT) machines do not always allow for patients to be scanned in the ideal position for image acquisition. This study aimed to investigate the influence of the position/angulation of the mandible relative to the X-ray beam of a CBCT machine. METHODS: Five sequential CBCT scans were captured of a human mandible at each angulation of 10°, 20°, 30°, and 40° using a coronal and sagittal positioning. Inspection software utilized a best-fit alignment to automatically calculate the three-dimensional variation at 15 standardized points of interest...
November 8, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30379560/an-ex-vivo-comparative-study-of-occlusal-and-proximal-caries-using-terahertz-and-x-ray-imaging
#2
Kıvanç Kamburoğlu, Burcu Karagöz, Hakan Altan, Doĝukan Özen
OBJECTIVES: To examine the effectiveness of terahertz (THz) pulsed imaging (TPI) in comparison to intraoral photostimulable phosphor late (PSP) and cone beam CT (CBCT) for the detection of dental caries ex vivo. METHODS: Newly extracted 32 human permanent teeth surfaces (16 with caries and 16 without caries) were serially sectioned mesiodistally and imaged by using four image sets as follows: (1) CBCT; (2) PSP; (3) THz movie video; and (4) THz static images. All images were evaluated twice separately by two calibrated observers for the presence/absence of caries using a 5-grade rating/confidence scale...
November 7, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30346803/imaging-the-bifid-mandibular-canal-using-high-resolution-mri
#3
Peerapong Wamasing, Chutamas Deepho, Hiroshi Watanabe, Yoshiki Hayashi, Junichiro Sakamoto, Tohru Kurabayashi
OBJECTIVE: This study aimed to investigate the incidence of bifid mandibular canals (BMCs) using high-resolution MRI with a three-dimensional volumetric interpolated breath-hold examination sequence (3D-VIBE) through the neurovascular bundle (NVB). METHODS: In this retrospective study, we extracted 154 datasets from our archive of patients who underwent MRI examination with a 3D-VIBE sequence for mandible lesions from January 2015 to April 2016. The right and the left mandibles were treated independently with 59 cases excluded due to NVB morphology or artifacts, yielding 249 hemi-mandible cases classified among three subtypes: Type 0 with no BMC, Type one with one NVB and two NVBs on route to it, and Type two with two NVBs...
November 7, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30346802/prevalence-of-radiographic-findings-on-jaws-exposed-to-antiresorptive-therapy-a-meta-analysis
#4
Kamile Leonardi Dutra, Letícia Fernanda Haas, Glaucia S Zimmermann, Gilberto Melo, Mariana Comparotto Minamisako, Carlos Flores-Mir, Márcio Corrêa
OBJECTIVES: Determine the prevalence of radiographic findings (RF) on both jaws among patients receiving antiresorptive bone therapy. METHODS: Six electronic databases and partial grey literature were searched. Data was collected based on predetermined criteria. The key features from the included studies were extracted. The MAStARI tool assessed the potential risk of bias (RoB) among the studies, while the GRADE approach determined the level of evidence. RESULTS: 29 studies were identified and included in the qualitative analysis, totalling 1133 patients...
November 7, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30346798/kerma-area-product-kap-and-scatter-measurements-for-intraoral-x-ray-machines-using-three-different-types-of-round-collimation-compared-with-rectangular-beam-limiter
#5
Dennise Magill, Nhan James Huu Ngo, Marc A Felice, Mel Mupparapu
OBJECTIVES: The objective of the study was to determine the radiation dose reduction achieved when rectangular collimation was used on various round collimators. In addition, we evaluated the tissue doses imparted to various head and neck organs. METHODS: To evaluate the variation in radiation output based on the variable geometric configurations, the kerma area product (KAP) was measured using a commercially available KAP-meter with an internal ion chamber capable of detecting both radiation dose (µGy) and the primary X-ray beam area...
November 7, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30306800/digital-panoramic-radiography-and-cone-beam-ct-as-ancillary-tools-to-detect-low-bone-mineral-density-in-post-menopausal-women
#6
Camila Nao Kato, Núbia Pk Tavares, Sâmila G Barra, Tânia Mp Amaral, Cláudia B Brasileiro, Lucas G Abreu, Ricardo A Mesquita
OBJECTIVES: To evaluate the usefulness of the mandibular cortical index (MCI) obtained by digital panoramic radiography (DPR) and by panoramic reconstruction (PR) of cone-beam CT (CBCT) with three different slice thicknesses for the screening of low bone mineral density (BMD) in post-menopausal women. METHODS: Two trained oral and maxillofacial radiologists assessed the MCI based on the morphology of the mandibular bone cortex (classified as C1, C2 or C3). The DPR and PR of CBCT with slice thicknesses of 5, 15 or 25 mm were compared to the BMD obtained by dual-energy X-ray absorptiometry (DXA) in post-menopausal women...
November 1, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30285469/diagnostic-ultrasound-assessment-of-temporomandibular-joints-a-systematic-review-and-meta-analysis
#7
Fabiana Tolentino Almeida, Camila Pacheco-Pereira, Carlos Flores-Mir, Lawrence H Le, Jacob L Jaremko, Paul W Major
OBJECTIVES: The purpose of this systematic review was to determine the diagnostic capability of ultrasound to assess TMJ alterations as disc displacement (DD), joint effusion (JE) and condylar changes (CC) using 3D imaging modalities as reference standard. METHODS: Studies were gathered by searching several electronic databases and partial grey literature up to January eighth, 2018 without restrictions of language and time. The risk of bias was evaluated using the second version of Quality Assessment Tool for Diagnostic of Accuracy Studies-2 (QUADAS-2)...
November 1, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30379570/a-deep-learning-artificial-intelligence-system-for-assessment-of-root-morphology-of-the-mandibular-first-molar-on-panoramic-radiography
#8
Teruhiko Hiraiwa, Yoshiko Ariji, Motoki Fukuda, Yoshitaka Kise, Kazuhiko Nakata, Akitoshi Katsumata, Hiroshi Fujita, Eiichiro Ariji
OBJECTIVES: The distal root of the mandibular first molar occasionally has an extra root, which can directly affect the outcome of endodontic therapy. In this study, we examined the diagnostic performance of a deep learning system for classification of the root morphology of mandibular first molars on panoramic radiographs. Dental cone-beam CT (CBCT) was used as the gold standard. METHODS: CBCT images and panoramic radiographs of 760 mandibular first molars from 400 patients who had not undergone root canal treatments were analyzed...
October 31, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30379569/marker-based-watershed-transform-method-for-fully-automatic-mandibular-segmentation-from-cbct-images
#9
Yi Fan, Richard Beare, Harold Matthews, Paul Schneider, Nicky Kilpatrick, John Clement, Peter Claes, Anthony Penington, Christopher Adamson
OBJECTIVES: To propose a reliable and practical method for automatically segmenting the mandible from CBCT images. METHODS: The marker-based watershed transform is a region-growing approach that dilates or 'floods' predefined markers onto a height map whose ridges denote object boundaries. We applied this method to segment the mandible from the rest of the CBCT image. The height map was generated to enhance the sharp decreases of intensity at the mandible/tissue border and suppress noise by computing the intensity gradient image of the CBCT itself...
October 31, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30306806/effect-of-laterality-gender-age-and-body-mass-index-on-the-fat-fraction-of-salivary-glands-in-healthy-volunteers-assessed-using-iterative-decomposition-of-water-and-fat-with-echo-asymmetry-and-least-squares-estimation-method
#10
Guo-Yi Su, Chuan-Bing Wang, Hao Hu, Jun Liu, Hong-Yuan Ding, Xiao-Quan Xu, Fei-Yun Wu
OBJECTIVES: To evaluate the effect of laterality, gender, age and body mass index (BMI) on fat fraction (FF) measurements of both parotid glands (PGs) and submandibular glands (SMGs) by using: Iterative decomposition of water and fat with echo asymmetry and least-squares estimation method (IDEAL-IQ). METHODS: A total of 87 healthy participants were enrolled in our study. IDEAL-IQ image was scanned using a 3.0 T scanner. Paired t test was performed to compare the difference on FF of both PGs and SMGs between left and right side...
October 26, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30299983/evaluation-of-the-dental-spectral-cone-beam-ct-for-metal-artifact-reduction
#11
Ling Zhu, Yi Chen, Jie Yang, Xiaofeng Tao, Yan Xi
OBJECTIVE: Metal artifacts are highly common in dental computed tomography (CT) images because of the high X-ray attenuation of metallic dental fillings and implants. This study presents an evaluation of the virtual monochromatic imaging for metal artefact reduction by a recently introduced dental spectral cone beam CT (SCBCT), which is the first commercial dental spectral CBCT with flat-panel detector. METHODS: We carried out phantom experiments and clinical trials in this study...
October 9, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30285478/evidence-of-genotoxicity-and-cytotoxicity-of-x-rays-in-the-oral-mucosa-epithelium-of-adults-subjected-to-cone-beam-computed-tomography
#12
Daniel Ribeiro
No abstract text is available yet for this article.
October 4, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30182744/comparison-of-manual-and-dose-reduction-modes-of-a-morita-r100-cbct
#13
Dennis Rottke, Julia Dreger, Kunihiko Sawada, Kazuya Honda, Dirk Schulze
OBJECTIVE: To compare effective dose differences when acquiring (1) dose reduction mode and (2) manual mode in a MORITA R100 CBCT. METHODS: 24 exposure protocols with different technique factors were performed in both the dose reduction mode and the manual mode in a Veraviewepocs 3D R100 cone beam CT device. 48 TLD were placed in a RANDO head phantom at 24 different sites. Effective doses were calculated according to the formalism published in the 103rd ICRP report...
October 3, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30260235/influence-of-vista-scan-image-enhancement-filters-on-diagnosis-of-simulated-periapical-lesions-on-intraoral-radiographs
#14
Danieli Moura Brasil, Mayra Cristina Yamasaki, Gustavo Machado Santaella, Maria Carolina Zumstein Guido, Deborah Queiroz Freitas, Francisco Haiter-Neto
OBJECTIVE: To evaluate whether image enhancement filters of VistaScan system improve the diagnostic accuracy of simulated periapical lesions. METHODS: Ten sockets were prepared on bovine ribs to fit a bovine tooth. Bone defects were created and successively enlarged providing four groups (n = 10): Group 0, absence of lesions; Group 1, periapical lesions with 1.6  mm in diameter; Group 2, with 1.8  mm in diameter; and Group 3, with 2.1  mm in diameter. Periapical radiographs were taken using a photostimulable storage phosphor plate and DBSWIN software...
September 27, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30222021/a-comparison-of-diagnosis-of-early-stage-interproximal-caries-with-bitewing-radiographs-and-periapical-images-using-consensus-reference
#15
Noriaki Takahashi, Cliff Lee, John Daren Da Silva, Hiroe Ohyama, Motoi Roppongi, Hidemichi Kihara, Wataru Hatakeyama, Shigemi Ishikawa-Nagai, Mitsuru Izumisawa
OBJECTIVES: The purpose of this study was to assess the diagnostic property of intraoral bitewing radiographs (BTW) for early stage interproximal caries, and to compare them with periapical radiographs (PA) at different levels of caries progression. METHODS: A total of 241 interproximal surfaces of BTW and corresponding PAs were used. Seven teaching faculty consisting of three oral and maxillofacial radiologists, two operative faculty, and two prosthodontists evaluated the images...
September 21, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30216090/image-segmentation-based-volume-approximation-volume-as-a-factor-in-the-clinical-management-of-osteolytic-jaw-lesions
#16
Martin Kauke, Ali-Farid Safi, Andrea Grandoch, Hans-Joachim Nickenig, Joachim Zöller, Matthias Kreppel
OBJECTIVE: Size characterization of osteolytic jaw lesions (OJL), in particular of neoplastic nature, is heterogeneously performed and lacks standardization in the medical literature and clinical practice. An OJL's volume holds promise as a surrogate for treatment response and prognosis. We comparatively evaluate various methods for size characterization of odontogenic OJLs. METHODS: We retrospectively performed semiautomatic image segmentation of CBCT data sets for volume approximation of neoplastic (51) and non-neoplastic odontogenic OJLs (100)...
September 21, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30216087/evaluation-of-mallear-ligaments-in-different-voxel-resolutions-using-cone-beam-computed-tomography
#17
Cansu Gorurgoz, Kaan Orhan, Enver Alper Sinanoglu, Ismail Hakan Avsever
OBJECTIVES: The aim of this study was to assess the visibility of discomallear ligament and anterior mallear ligament together with anatomical morphometric measurements of petrotympanic fissure, and to determine whether the mallear ligaments correlate with the bone compartment changes of temporomandibular joint. METHODS: Cone beam CT images of 275 patients were evaluated retrospectively. The visibility of discomallear and anterior mallear ligaments were evaluated by two observers...
September 21, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30160533/three-dimensional-imaging-methods-to-quantify-soft-and-hard-tissues-change-after-cleft-related-treatment-during-growth-in-patients-with-cleft-lip-and-or-cleft-palate-a-systematic-review
#18
Bennaree Awarun, Jorden Blok, Ruben Pauwels, Constantinus Politis, Reinhilde Jacobs
OBJECTIVES: To assess the use of three-dimensional (3D) imaging methods to quantify the changes in soft- and hard-tissues in cleft patients after cleft-related treatment during growth. METHODS: PubMed, EMBASE, Web of Science and the Cochrane Library were searched up to 1 June 2018. Included publications were those using 3D imaging to quantify soft- and hard-tissue changes after cleft-related treatments in patients with any type of cleft, during growth. Data extraction and qualitative analysis were performed by two reviewers...
September 21, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30216093/cbct-image-based-segmentation-method-for-tooth-pulp-cavity-region-extraction
#19
Lei Wang, Ju-Peng Li, Zhi-Pu Ge, Gang Li
OBJECTIVE: A method was proposed to segment the tooth pulp cavity region in cone-beam computed tomography (CBCT) images, which aimed to make the extraction process more efficient and generate more reliable results for further research. METHODS: CBCT images of fifty teeth from ten patients were randomly collected with the help of Peking University Hospital of Stomatology. All slice images have a ground truth tooth pulp cavity region delineated by two doctors manually...
September 14, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30084261/beam-hardening-correction-tool-improves-the-diagnosis-of-incipient-caries-lesions-in-micro-ct-images
#20
Karla Rovaris, Saulo Leonardo Sousa Melo, Polyane Mazucatto Queiroz, Carolina Loch, Donald R Schwass, Francisco Haiter-Neto
OBJECTIVE: To evaluate the effect of Beam Hardening Correction tool (BHC) on Micro-CT images used in the diagnosis of incipient caries lesions. METHODS: Six posterior teeth, with 6 sound proximal surfaces and 6 natural white spot lesions, were scanned using a SkyScan1174 device. Each tooth was imaged 16 times in various acquisition parameters, and reconstructed 3 times applying different levels of BHC (0, 15 and 30%). The 288 datasets were analyzed by three examiners...
September 4, 2018: Dento Maxillo Facial Radiology
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