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Dento Maxillo Facial Radiology

Reinier Cornelis Hoogeveen, Bram R Meertens, Erwin W E R Berkhout
METHODS AND MATERIALS: 20 operators obtained intraoral radiographs of four regions (bitewing, upper molar, lower molar and upper anterior) in five mannequins, using HH and WM devices. Beam-aiming devices were fitted with metal cross-wires to project on image sensors. Deviation from ideal perpendicular incidence of beam was calculated, based on positions of cross-wires relative to gold-standard positions (i.e. average of 10-fold precise aiming by authors via WM system). Analytic models relied on Wilcoxon signed-rank test and mixed model analyses...
April 14, 2019: Dento Maxillo Facial Radiology
Amanda Farias Gomes, Yuri Nejaim, Rocharles Cavalcante Fontenele, Francisco Haiter Neto, Deborah Queiroz de Freitas
OBJECTIVE: To evaluate the quality of images obtained with the addition of a lead foil to intraoral digital receptors. METHODS: Radiographic images of 34 single-rooted human teeth - 19 with vertical root fracture (VRF) and 15 of the control group - were obtained with and without the addition of a lead foil, using the VistaScan, Express, Digora Optime and Digora Toto systems. Images were evaluated by five observers regarding the diagnosis of VRF, using a 5-point scale...
April 14, 2019: Dento Maxillo Facial Radiology
Niels Belmans, Liese Gilles, Piroska Virag, Mihaela Hedesiu, Benjamin Salmon, Sarah Baatout, Stéphane Lucas, Reinhilde Jacobs, Ivo Lambrichts, Marjan Moreels
OBJECTIVES: Cone-beam CT (CBCT) is a medical imaging technique used in dental medicine. However, there are no conclusive data available indicating that exposure to X-ray doses used by CBCT are harmless. We aim, for the first time, to characterize the potential age-dependent cellular and subcellular effects related to exposure to CBCT imaging. Current objective is to describe and validate the protocol for characterization of cellular and subcellular changes after diagnostic CBCT. METHODS: Development and validation of a dedicated two-part protocol: 1) assessing DNA double strand breaks (DSBs) in buccal mucosal (BM) cells and 2) oxidative stress measurements in saliva samples...
March 26, 2019: Dento Maxillo Facial Radiology
Yoshihiko Sasaki, Ichiro Ogura
OBJECTIVES: To evaluate shear wave elastography in differentiating between benign and malignant cervical lymph nodes in patients with oral carcinoma. METHODS: Seventy-seven patients with oral squamous cell carcinoma were examined by B-mode and shear wave elastography with a 14 MHz linear transducer. The integrated shear wave elastography software allowed the operator to place regions of interest (ROIs) of various sizes within the elastography window, and automatically displayed shear elastic modulus data (kPa) for each ROI...
March 21, 2019: Dento Maxillo Facial Radiology
Hoang-Anh Tran, Jessica B O'Connell, Urie K Lee, John C Polanco, Tina I Chang, Arthur H Friedlander
OBJECTIVE: Males with peripheral arterial disease (PAD) are at high risk of ischaemic stroke given that atherogenic risk factors for both diseases are similar. We hypothesized that neurologically asymptomatic males diagnosed with PAD would demonstrate calcified carotid artery plaques (CCAP) on panoramic images (PI) significantly more often than similarly aged males not having PAD. METHODS: Investigators implemented a retrospective cross-sectional study. Subjects were male patients over age 50 diagnosed with PAD by ankle-brachial systolic pressure index results of <mml:math xmlns:mml="http://www...
March 15, 2019: Dento Maxillo Facial Radiology
Danieli Moura Brasil, Ruben Pauwels, Wim Coucke, Francisco Haiter-Neto, Reinhilde Jacobs
OBJECTIVE: Dental Cone-beam computed tomography (CBCT) exposure parameters should be optimized according to patient-specific indications, mainly for children that are most vulnerable to harmful effects of ionizing radiation. The aim of this study was to determine optimized kV settings for pediatric acquisitions for a dental CBCT device. METHODS: Clinical and quantitative evaluations of image quality were performed using 5 and 10 years old (y/o) anthropomorphic phantoms...
March 13, 2019: Dento Maxillo Facial Radiology
Eliana Dantas Costa, Priscila Dias Peyneau, Glaucia Maria Bovi Ambrosano, Matheus Oliveira
OBJECTIVES: To evaluate the influence of cone beam computed tomography (CBCT) volume orientation on alveolar bone measurements for dental implant planning using CBCT in patients with different facial profiles. METHODS: Seventy-four CBCT volumes were selected from a database and classified according to the facial profile of the patient. Height and width measurements of the alveolar bone were carried out with the volume of the mandible in two different orientations: occlusal plane and mandibular base parallel to the horizontal plane...
March 13, 2019: Dento Maxillo Facial Radiology
Dmitry V Tuzoff, Lyudmila N Tuzova, Michael M Bornstein, Alexey S Krasnov, Max A Kharchenko, Sergey I Nikolenko, Mikhail M Sveshnikov, Georgiy B Bednenko
OBJECTIVES: Analysis of dental radiographs is an important part of the diagnostic process in daily clinical practice. Interpretation by an expert includes teeth detection and numbering. In this project, a novel solution based on convolutional neural networks (CNNs) is proposed that performs this task automatically for panoramic radiographs. METHODS: A data set of 1352 randomly chosen panoramic radiographs of adults was used to train the system. The CNN-based architectures for both teeth detection and numbering tasks were analyzed...
March 5, 2019: Dento Maxillo Facial Radiology
Louise Hauge Matzen, Erwin Berkhout
OBJECTIVES: Lack of evidence on the use of CBCT for management of mandibular third molars in Radiation Protection guideline no. 172 of the European Commission made the European Academy of DentoMaxilloFacial Radiology (EADMFR) decide to update the recommendations of the guideline. METHODS AND MATERIALS: A literature search was performed addressing the following questions: (1) does CBCT change the treatment of the patient?; (2) does CBCT reduce the number of post-operative sensory disturbances of the inferior alveolar nerve?; and (3) can CBCT predict the risk for a post-operative sensory disturbance of the inferior alveolar nerve? RESULTS:  Since the European Commission published the guideline in 2012 several high-evidence studies on the use of CBCT before removal of mandibular third molars have been conducted including five randomized controlled clinical trials and one meta-analysis...
March 5, 2019: Dento Maxillo Facial Radiology
Dong Zheng, Lixuan Niu, Wenpeng Liu, Changgang Zheng, Ruyi Yan, Liyan Gong, Zhongxing Dong, Ke Li, Jun Fei
OBJECTIVES:  To investigate the relationship between maximum standardized uptake value (SUVmax) of 18 F-FDG PET/CT and clinicopathological features of oral squamous cell carcinoma (OSCC), in order to formulate a better clinical guideline. METHODS:  In 104 patients with OSCC confirmed by pathology, there were 67 males and 37 females (age, 33-76 years; mean age, 56 years).18 FDG, 18-fludeoxyglucose (18 F-FDG) PET/CT manifestations and the clinicopathological features of the 104 patients were retrospectively analysed...
March 5, 2019: Dento Maxillo Facial Radiology
Dilek Yılmaz, Kıvanç Kamburoğlu
OBJECTIVES: To assess the effectiveness of a high resolution ultrasound for temporomandibular joint (TMJ) evaluation in comparison to MRI in patients with TMJ disorders. METHODS: Our study comprised 50 patients (35 female and 15 male) with a mean age of 30.61. Clinical examination was performed. Bilateral imaging of TMJ was conducted by using a high-resolution ultrasound and 1.5 Tesla MR. Diagnostic accuracy of ultrasound was assessed for disc displacement and joint effusion in comparison to MRI...
February 28, 2019: Dento Maxillo Facial Radiology
Ayman Al-Okshi, Liselotte Paulsson, Madeleine Rohlin, Eman Ebrahim, Christina Lindh
OBJECTIVES: To evaluate measurability and reliability of measurements of root length and marginal bone level in CBCT, periapical (PA) and bitewing (BW) radiographs. METHODS: CBCT of both jaws, PA of maxillary incisors and posterior BW radiographs of 10 adolescents (mean age 13.4) were selected. The radiographs comprised part of the baseline examinations of a trial of orthodontic treatment. Six raters assessed measurability and measured root length and marginal bone level...
February 28, 2019: Dento Maxillo Facial Radiology
Wolfgang Jacquet, Roberto G Cleymaet, Peter Bottenberg
OBJECTIVES: Grey value perception is important in viewing and interpreting X-ray images. It is possible that ageing decreases the number of gray values that a person can distinguish. This hypothesis was tested in a group of dental practitioners from students to experienced dentists using a 12-bit grey scale. METHODS AND MATERIALS: A custom-made computer software was used based on the principle of the "just noticeable difference" (JND). Observers were shown a picture of an outer square with increasing grey value in which a smaller square of different grey value popped up in changing positions...
February 26, 2019: Dento Maxillo Facial Radiology
Diana Macianskyte, Egle Monastyreckiene, Algidas Basevicius, Rimas Adaskevicius
OBJECTIVES: To evaluate thermal images (TIs) by using an algorithm for optimized region of interest (ROI) and image segmentation, in order to find zones of the facial skin surface with asymmetrical temperature, and to test consistency with CT findings, to detect maxillofacial pathologies (i.e. tumours). METHODS: The following steps for the TI evaluation were applied: data acquisition/pre-processing of frontal face and mouth projection, detection of face and mouth external contour, finding face and mouth symmetry axis, calculation of differences in average and maximal temperatures between left and right face and mouth sides, image segmentation of the selected ROI, and evaluation of diagnostic accuracy by comparing the TI results with CT findings...
February 19, 2019: Dento Maxillo Facial Radiology
Laith Mizban, Mohamed El-Belihy, Mina Vaidyanathan, Jackie Brown
OBJECTIVES: CBCT exposes the paediatric patient to a higher X-ray dose and risk than normal dental radiographs. This study has two components: an audit and service evaluation. The audit aims to assess whether the use of CBCT in a Paediatric Dentistry department at a London hospital complies with European guidelines (SEDENTEXCT). The service evaluation aims to explore the influence of CBCT on treatment planning. METHODS: Two 6 month audit cycles were completed, where CBCT requests were audited to check whether image justifications comply with SEDENTEXCT...
February 12, 2019: Dento Maxillo Facial Radiology
Ralf Kurt Willy Schulze, Clara I Doering
OBJECTIVES: To develop a simple way to compute the approximated modulation transfer function (MTF) manually using conventional spreadsheet software. METHODS AND MATERIALS: Basing on an edge-image a method was developed, facilitating computation of the edge spread (ESF) and line spread function (LSF) in open-source spread-sheet software (Gnumeric; ). By means of the integrated Fast Fourier Transformation (FFT) Fourier coefficients are obtained from the LSF which can then be plotted versus spatial frequency to obtain MTF-plots...
February 1, 2019: Dento Maxillo Facial Radiology
Nobuo Kashiwagi, Tomoko Hyodo, Kazunari Ishi, Osamu Maenishi, Eisuke Enoki, Takaaki Chikugo, Masakatsu Tsurusaki, Mutsukazu Kitano, Yukinobu Yagyu, Noriyuki Tomiyama
OBJECTIVES: To report magnetic resonance imaging (MRI) findings of spontaneous infarction in parotid tumours. METHODS: Fourteen patients (13 male, one female; mean age 73 years) with spontaneously infarcted parotid tumours were reviewed retrospectively. MR images were assessed for the location, the presence of synchronous parotid masses, margin characteristics, signal intensity on T 1 - and T 2 -weighted images, and internal architecture according to the distribution of T2 signal hyperintensity...
February 1, 2019: Dento Maxillo Facial Radiology
Oya Akyol, Bahar Dirican, Turkay Toklu, Hakan Eren, Turan Olgar
OBJECTIVES: The aim of this study was to investigate the effect of dental implant materials with different physical densities on dose distribution for head and neck cancer radiotherapy planning. METHODS: Titanium (Ti), Titanium alloy (Ti-6Al-4V), Zirconia (Y-TZP), Zirconium oxide (ZrO2 ), Alumina (Al2 O3 ) and polyetheretherketone (PEEK) dental implant materials were used for determination of implant material effect on dose distribution. Dental implant effect was investigated by using pencil beam convolution (PBC) algorithm of Eclipse treatment planning systems (TPS) and Monte Carlo (MC) simulation technique...
February 1, 2019: Dento Maxillo Facial Radiology
Danieli Moura Brasil, Ruben Pauwels, Wim Coucke, Francisco Haiter-Neto, Reinhilde Jacobs
OBJECTIVES: To determine the optimized kV setting for a narrow detector cone-beam CT (CBCT) unit. METHODS: Clinical (CL) and quantitative (QUANT) evaluations of image quality were performed using an anthropomorphic phantom. Technical (TECH) evaluation was performed with a polymethyl methacrylate phantom. Images were obtained using a PaX-i3D Green CBCT (Vatech, Hwaseong, Korea) device, with a large 21 × 19 and a medium 12 × 9 cm field of view (FOV), and high-dose (HD-ranging from 85 to 110 kV) and low-dose (LD-ranging from 75 to 95 kV) protocols, totaling four groups (21 × 19 cm HD, 21 × 19 cm LD, 12 × 9 cm HD, 12 × 9 cm LD)...
January 31, 2019: Dento Maxillo Facial Radiology
Richard Smith, Richard Tremblay, Graeme M Wardlaw
OBJECTIVES: Evaluate stray radiation to the operator, as represented by a plane within the significant zone of occupancy (SZO), produced by five models of hand-held intra oral dental X-ray devices (HIDXDs). METHODS: The stray radiation for five models of HIDXDs was measured, using an anthropomorphic tissue-equivalent head phantom as a scattering object. An ionisation chamber was used to measure the air kerma (μGy) at 63 positions in a 160 cm high by 60 cm wide plane that was 10 cm behind the X-ray device, identified as being within the SZO...
January 29, 2019: Dento Maxillo Facial Radiology
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