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Dento Maxillo Facial Radiology

Romke Rozema, Michiel Hj Doff, Peter Ma van Ooijen, Douwe Postmus, Henriëtte E Westerlaan, Martijn F Boomsma, Baucke van Minnen
OBJECTIVE: To assess the diagnostic reliability of low dose Multidetector Computed Tomography (MDCT) and Cone Beam Computed Tomography (CBCT) for zygomaticomaxillary fracture diagnosis. METHODS: Unilateral zygomaticomaxillary fractures were inflicted on four out of six fresh frozen human cadaver head specimens. All specimens were scanned using four MDCT and two CBCT imaging protocols of which the radiation exposure was systematically reduced. A blinded diagnostic routine was simulated at which 16 radiologists and 8 oral and maxillofacial (OMF) surgeons performed randomized image assessments...
May 10, 2018: Dento Maxillo Facial Radiology
Pamela Zengel, Florian Notter, Dirk Andre Clevert
OBJECTIVES: Ultrasound is the method of choice for preoperative evaluation of tumors of the parotid glands. However, existing methods do not allow for clear differentiation between the most common benign tumors and malignant tumors. The aim of our study was to evaluate if acoustic radiation force, Virtual Touch Quantification (VTQ) elastography helps to improve the preoperative evaluation of parotid masses. METHODS: We investigated the parenchyma of 102 parotid glands, fourteen lymph nodes of healthy volunteers and 51 tumors of the parotid gland via ultrasound, color Doppler ultrasound and VTQ...
May 10, 2018: Dento Maxillo Facial Radiology
Daniel Benchimol, Nils Kadesjö, Juha Koivisto, Xie-Qi Shi
OBJECTIVES: The primary aim was to evaluate the effective dose for a full size panoramic image and nine different panoramic protocols using collimation. The secondary aim was to estimate possible reduction of effective dose in clinical situations. METHODS: Effective dose, according to International Commission on Radiological Protection (ICRP) 2007, were determined for a full size panoramic image and nine different panoramic protocols applying collimation on an anthropomorphic Rando phantom, using metal-oxide semiconductor field-effect transistor (MOSFET) dosimeters...
May 3, 2018: Dento Maxillo Facial Radiology
Doaa Felemban, Rinus G Verdonschot, Yuri Iwamoto, Yuka Uchiyama, Naoya Kakimoto, Sven Kreiborg, Shumei Murakami
PURPOSE: Our goal was to assess MR image uniformity by investigating aspects influencing said uniformity via a method laid out by the National Electrical Manufacturers Association (NEMA). METHODS: Six metallic materials embedded in a glass phantom were scanned (i.e., Au, Ag, Al, Au-Ag-Pd alloy, Ti and Co-Cr alloy) as well as a reference image. Sequences included Spin Echo (SE) and gradient echo (GRE) scanned in three planes (i.e., Axial, Coronal, and Sagittal). Moreover, three surface coil types (i...
May 2, 2018: Dento Maxillo Facial Radiology
Carsten Rendenbach, Maximilian Schoellchen, Julie Bueschel, Tobias Gauer, Jan Sedlacik, Daniel Kutzner, Pekka K Vallittu, Max Heiland, Ralf Smeets, Jens Fiehler, Susanne Siemonsen
OBJECTIVES: To analyze Magnetic Resonance Imaging (MRI) artifact induced at 3 Tesla by bioresorbable, titanium and glass fiber reinforced composite (GFRC) plates for osseous reconstruction. METHODS: Fixation plates including bioresorbable polymers (Inion CPS, Inion Oy, Tampere, Finland; Rapidsorb, DePuy Synthes, Umkirch, Germany; Resorb X, Gebrueder KLS Martin GmbH, Tuttlingen, Germany), Glass fiber reinforced composite (Skulle Implants Oy, Turku, Finland) and titanium plates of varying thickness and design (DePuy Synthes, Umkirch, Germany) were embedded in agarose gel and a 3T MRI was performed using a standard protocol for head and neck imaging including T1w and T2w sequences...
May 2, 2018: Dento Maxillo Facial Radiology
Eliana Dantas da Costa, Adriana Dantas da Costa, Carlos Augusto de Souza Lima, Rosana de Fátima Possobon, Glaucia Maria Bovi Ambrosano
OBJECTIVES: To assess the infection control in oral radiology among radiologists and dentists of diverse dentistry clinical specialties and among dentistry students. METHODS: A Questionnaire on Infection Control in Oral Radiology (QICOR) was applied to 1006 dentists and 1203 dentistry students. For assessment of infection control, the scores of the questionnaire were dichotomized in high and low through the median. Simple logistic regression models were set for adherence to infection control and independent variables, estimating the crude odds ratios with the respective 95% confidence intervals...
May 2, 2018: Dento Maxillo Facial Radiology
Akira Takahashi, Chieko Sugawara, Kazuya Akita, Kumiko Kamada, Keiko Kudoh, Tetsuya Tamatani, Youji Miyamoto
OBJECTIVES: Nasopharyngeal tonsilloliths (NT) and eustachian tube tonsilloliths (ET) are not as well-known to radiologists as palatine and lingual tonsilloliths. The aim of this investigation was to determine the prevalence and imaging characteristics of NT and ET using computed tomography (CT) and panoramic radiographs. METHODS: We retrospectively assessed the scans of 2244 patients who underwent consecutive CT and panoramic radiographs of the maxillofacial region...
May 1, 2018: Dento Maxillo Facial Radiology
Young-A Ji, You-Mee Lee, Hyun-Dae Lim, Won-Jong Park, Ji-Hye Jung, Je-Woo Lee, Byung-Do Lee
OBJECTIVES: This study investigates the students' satisfaction and awareness of competency towards smartphone use and schema-based learning in dental radiology practice. METHODS: Third year students undertaking a dental radiology practicum at a dental school were divided into two groups: one group received traditional clinical training, whereas the other group used smartphones in classes and received new training using schema assignments. At the end of the course, students' satisfaction with the training and self-awareness of their competency were surveyed, and their achievement was assessed...
April 30, 2018: Dento Maxillo Facial Radiology
Junjie Zeng, Huaping Liu, Lizhi Liu, Weihua Liao, Ping Hu, Xiaoyi Wang, Xuejun Li, Lunquan Sun, Youming Zhang, Xiaoping Yi
OBJECTIVES: To analyze the clinicopathological features and the CT and MRI features of patients with paranasal sinus fibrosarcoma. METHODS: Seven patients with surgically and pathologically confirmed paranasal sinus fibrosarcoma were enrolled. Their CT and MRI data and imaging features were retrospectively analyzed in detail. RESULTS: The study participants were two males and five females (median age, 43 years; range, 22-73 years). CT or MRI showed a well-defined (n = 5) or ill-defined (n = 2), irregular (n = 6) or oval (n = 1) mass, with heterogeneous (n = 7) density...
April 23, 2018: Dento Maxillo Facial Radiology
Liu Liu, Byung Cheol Kang, Suk Ja Yoon, Jae Seo Lee, Sel Ae Hwang
OBJECTIVES: To describe accurately the radiographic characteristics of lingual mandibular bone depression (LMBD) using CBCT images. METHODS: This study included 30 cases of LMBD with CBCT images from 29 patients. Age, sex, location, shape, size, and the relationships of the LMBDs to adjacent anatomical structures such as the mandibular inferior cortex and mandibular canal were recorded. The correlation between age and size was evaluated using Pearson's correlation coefficient...
April 23, 2018: Dento Maxillo Facial Radiology
Shun Yu, Zhongshuai Zhang, Bao Qiang, S U Jiawei, Mengxiao Liu, Qinglei Shi, Wenchao Cai
PURPOSE: To study the value of diffusion kurtosis imaging (DKI) in diagnosis of parotid gland disease (PGD) with different pathological patterns and parotid adenolymphoma (PAL). METHODS: Fifty-seven patients with different kinds of PGD were enrolled and underwent DKI and conventional diffusion-weighted imaging (DWI). All patients were categorized into different groups according to their pathological patterns. The result of calculating the value of DKI-derived parameters (Kmean, Krad, Kax, Dmean, Drad, Dax, and FA) and apparent diffusion coefficient (ADC) of DWI were used to study their diagnostic accuracy in PGD with different pathological patterns...
April 20, 2018: Dento Maxillo Facial Radiology
Kubra Agirman Torenek, Ozkan Miloglu, Osman Murat Bilge
OBJECTIVES: The purpose of this study is to evaluate the compatibility of ultrasonographic data with hand-wrist radiographs taken to determine the extent of pubertal growth and bone age in patients and investigate the usability of ionizing radiation-free ultrasonography instead of conventional radiography. METHODS: In this study, a total of 120 children from 10 to 17 years old (mean age was 168 months ± 27.5 months) were treated with routine radiographs before orthodontic treatment, and ultrasonographic imaging was performed on the wrists the same day...
April 18, 2018: Dento Maxillo Facial Radiology
Christoph A Reichel, Teresa Vincek, Donata Gellrich, Florian Schrötzlmair, Dirk Clevert, Pamela Zengel
OBJECTIVE: This study aims to answer whether Acoustic Radiation Force Impulse Imaging (ARFI) can reasonably be employed in initial examination and follow-up during therapy in patients with sialolithiasis, one of the most common non-malignant disorders of the salivary glands. METHODS: Mechanical tissue properties of affected and contralateral healthy salivary glands were analyzed by ARFI in 129 patients with sialolithiasis. In different subgroup analyses, ARFI shear wave velocity values were compared between healthy and diseased submandibular or parotid glands, salivary glands with calculi exhibiting different sizes, as well as before and after therapy...
April 18, 2018: Dento Maxillo Facial Radiology
Rocharles C Fontenele, Eduarda Hl Nascimento, Taruska V Vasconcelos, Marcel Noujeim, Deborah Q Freitas
OBJECTIVES: To evaluate the magnitude of artifacts related to titanium and zirconium implants at different distances and angulations and their impact on cone beam computed tomography (CBCT) image quality. METHODS: CBCT images were obtained before and after the insertion of titanium and zirconium implants in a mandible on different CBCT units: Picasso Trio, ProMax 3D and 3D Accuitomo 80. Artefact was assessed by measuring the standard deviation of gray values (SD) and contrast-to-noise ratio (CNR) of 11 regions of interest (ROI) at different distances (1...
April 18, 2018: Dento Maxillo Facial Radiology
Ladan Hafezi, Seyyedeh Marjan Arianezhad, Seyed Mahdi Hosseini Pooya
BACKGROUND: The value for the use of thyroid shield is one of the issues in radiation protection of patients in dental panoramic imaging. OBJECTIVES: The objective of this research is to investigate the attenuation characteristics of some models of thyroid shielding in dental panoramic examinations. METHODS: The effects of five different types of lead and lead-free (Pb-Equivalent) shields on dose reduction of thyroid gland were investigated using implanted TLDs in head-Neck parts of a Rando phantom...
April 16, 2018: Dento Maxillo Facial Radiology
Galal Omami, Craig S Miller
A traumatic odontoid fracture was depicted incidentally on a panoramic radiograph of a 73-year-old male patient. This brief note sheds light on the importance of following a systematic visual interrogation of panoramic radiographs, ensuring all anatomic structures are carefully assessed and incidental findings are not overlooked.
April 11, 2018: Dento Maxillo Facial Radiology
Masaya Kawaguchi, Hiroki Kato, Tatsuhiko Miyazaki, Keizo Kato, Daijiro Hatakeyama, Keisuke Mizuta, Mitsuhiro Aoki, Masayuki Matsuo
OBJECTIVES: The current study aimed to assess CT and MRI characteristics of histological subtypes of head and neck ossifying fibroma (OF). METHODS: 12 patients with histopathologically-proven head and neck OF were included in this study. Lesions were pathologically classified into three histological subtypes: eight cement-OFs (COFs), three juvenile psammomatoid OFs (JPOFs), and one juvenile trabecular OF (JTOF). All patients underwent CT examination, while seven also underwent MRI...
April 11, 2018: Dento Maxillo Facial Radiology
Yue Zhou, Ju-Peng Li, Wen-Chao Lv, Ruo-Han Ma, Gang Li
OBJECTIVES: A method was introduced for three-dimensional (3D) cone-beam computed tomography (CBCT) images registration of temporomandibular joint (TMJ). This study aimed to provide quantitative and qualitative analysis of TMJ bone changes in two-dimensional (2D) and 3D and to provide the technique for computer aided diagnosis of temporomandibular joint disorders (TMD) in the future. METHODS: Ten TMJ samples of six patients were obtained from Peking University Hospital of Stomatology...
March 29, 2018: Dento Maxillo Facial Radiology
Chan-Hyun Lee, Euiseong Kim, Dohyun Kim
This report describes the case of a 52-year-old male patient who exhibited suspicious pulsation patterns during pulpal blood flow assessment using Doppler ultrasound. Initially, he was not aware of his cardiovascular problem; however, after referral to a medical clinic, he was diagnosed with atrial fibrillation. The patient was injured in a motor vehicle accident and referred to our clinic for management of multiple traumatized teeth. On clinical examination, several teeth exhibited negative responses to cold and electrical sensibility tests...
March 27, 2018: Dento Maxillo Facial Radiology
Tania C Niño-Sandoval, Carlos F Morantes Ariza, Clementina Infante-Contreras, Belmiro Ce Vasconcelos
OBJECTIVES: The purpose of this study was to demonstrate that asymmetry is a natural occurring phenomenon in the mandibular shape by using Elliptical Fourier Analysis. METHODS: 164 digital orthopantomographs from Colombian patients of both sexes aged 18 to 25 years were collected. Curves from left and right hemimandible were digitized. An Elliptical Fourier Analysis was performed with 20 harmonics. In the general sexual dimorphism a Principal Component Analysis (PCA) and a Hotelling T2 from the multivariate warp space were employed...
March 27, 2018: Dento Maxillo Facial Radiology
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