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Dento Maxillo Facial Radiology

Maria-Pavlina Kalla, Theodore L Economopoulos, George K Matsopoulos
OBJECTIVES: Image registration is commonly used in dental applications for aligning imaging data sets, which is particularly useful when assessing the progression or regression of particular pathomorphic conditions. However, due to the nature of the processed data or the data acquisition process itself, rigid body registration may be insufficient to accurately align the processed data sets. In such cases, deformable models are employed. This study presents a comparison of four well-established deformable models for aligning CBCT volumes...
May 24, 2017: Dento Maxillo Facial Radiology
Cosimo Nardi, Cinzia Talamonti, Stefania Pallotta, Paola Saletti, Linda Calistri, Cesare Cordopatri, Stefano Colagrande
OBJECTIVES: To evaluate the effective dose and image quality of horizontal Cone Beam CT (CBCT) in comparison with Multislice Spiral CT (MSCT) in head, cervical spine, ear and dental arches scans. METHODS: Head and neck Alderson-Rando phantom equipped with seventy-four thermoluminescence dosimeters was exposed according to five different scans in CBCT and four different scans in MSCT. Spatial and contrast resolution, in terms of Modulation Transfer Function (MTF) and Contrast-to-Noise Ratio (CNR), were measured to obtain a quantitative assessment of image quality...
May 16, 2017: Dento Maxillo Facial Radiology
Eliana Dantas da Costa, José Eduardo Corrente, Glaucia Maria Bovi Ambrosano
No abstract text is available yet for this article.
May 16, 2017: Dento Maxillo Facial Radiology
Kazuhito Yoshida, Motoki Fukuda, Kenichi Gotoh, Eiichiro Ariji
OBJECTIVES: To clarify the depression aspect of the maxillary sinus anterior wall, and to investigate its relationship with the panoramic image appearance of a diagonal line from the inferior part of the so-called panoramic innominate line to the medial portion of the orbital floor line. METHODS: Based on computed tomographic (CT) data, panoramic images were simulated for two typical cases with and without anterior wall depression. Next, on axial CT images of 1689 subjects (3378 sinuses) stored in our image database, the wall depths were measured and analyzed for their relationships with the panoramic appearances of the diagonal line, classified into invisible, obscure, and clear patterns...
May 16, 2017: Dento Maxillo Facial Radiology
Ana Paula Oliveira Reis Durão, Aline Morosolli, Brown Jackie, Jacobs Reinhilde
OBJECTIVES: The aims of this study were to systematically review the existing scientific literature and evidence about (a) the validation of masseter muscle ultrasonography for accurate assessment of muscle thickness, and (b) the reproducibility of masseter muscle thickness measures. METHODS: An electronic literature search was conducted using determined keywords on specific databases. Preliminary search revealed 298 articles listed in Medline, Scopus and Web of Science...
May 3, 2017: Dento Maxillo Facial Radiology
Hui Chen, Maureen van Eijnatten, Jan Wolff, Jan de Lange, Paul F van der Stelt, Frank Lobbezoo, Ghizlane Aarab
OBJECTIVE: The aim of this study was to assess the reliability and accuracy of three different imaging software packages for three-dimensional analysis of the upper airway using cone-beam computed tomography (CBCT) images. METHODS: To assess the reliability of the software packages, fifteen NewTom 5G CBCT datasets were randomly and retrospectively selected. Two observers measured the volume, minimum cross-sectional area, and length of the upper airway using Amira(®), 3Diagnosys(®), and Ondemand3D(®) software packages...
May 3, 2017: Dento Maxillo Facial Radiology
Shinji Kito, Hirofumi Koga, Masafumi Oda, Tatsurou Tanaka, Ikuya Miyamoto, Masaaki Kodama, Manabu Habu, Shinya Kokuryo, Kenji Osawa, Noriaki Yamamoto, Shinobu Matsumoto-Takeda, Nao Wakasugi-Sato, Noriaki Kawanabe, Daigo Yoshiga, Shun Nishimura, Takaaki Joujima, Ayae Kito-Shingaki, Masataka Uehara, Masaaki Sasaguri, Yasuhiro Morimoto
OBJECTIVES: To elucidate the changes in the distributions of (18)F-fluoro-2-deoxy-D-glucose (FDG) accumulation into the tongue muscles of patients following four kinds of surgical operations for tongue cancers. METHODS: The changes in the distributions of (18)F-FDG accumulations in the tongue muscles on positron emission tomography (PET)-computed tomography (CT), in association with imaging findings on CT and magnetic resonance imaging (MRI), were retrospectively analyzed before and after four kinds of surgical operations for 50 patients with tongue cancers...
May 3, 2017: Dento Maxillo Facial Radiology
Michele Cassetta, Nicola Pranno, Alessandro Stasolla, Nicola Orsogna, Davide Fierro, Costanza Cavallini, Vito Cantisani
OBJECTIVES: To evaluate the effect of orthodontic stainless steel brackets and two different types of archwires (stainless steel and nickel-titanium) on the diagnostic quality of 3T-MR images. METHODS: This prospective, case-control study was conducted following STROBE guidelines. The imaging protocol consisted of the axial Fluid Attenuated Inversion Recovery (FLAIR) and axial oblique double echo proton density (PD) and weighted/turbo spin echo (TSE) T2-weighted sequences for brain, paranasal sinuses and cervical region evaluation; sagittal TSE T2w, sagittal TSE T1w and axial T2* Gradient echo sequences (GRE) sequences for the cervical vertebrae; axial and coronal TSE T2w images for the head and neck structures; and sagittal, axial and coronal PD and TSE T2-weighted sequences for the temporo-mandibular joint...
April 28, 2017: Dento Maxillo Facial Radiology
Jamille B Ferreira, Ilana O Christovam, David S Alencar, Andréa F J da Motta, Claudia T Mattos, Adriana Cury-Saramago
OBJECTIVES: The aim of this systematic review with meta-analysis was to assess the accuracy and reproducibility of dental measurements obtained from digital study models generated from CBCT compared with those acquired from plaster models. METHODS: The electronic databases Cochrane Library, Medline (via PubMed), Scopus, VHL, Web of Science, and System for Information on Grey Literature in Europe were screened to identify articles from 1998 until February 2016. The inclusion criteria were: prospective and retrospective clinical trials in humans; validation and/or comparison articles of dental study models obtained from CBCT and plaster models; and articles that used dental linear measurements as an assessment tool...
April 26, 2017: Dento Maxillo Facial Radiology
Xin Liang, Zuyan Zhang, Jianping Gu, Zhihui Wang, Bart Vandenberghe, Reinhilde Jacobs, Jie Yang, Guowu Ma, Haibin Ling, Xuchen Ma
OBJECTIVES: To evaluate the accuracy of CBCT in assessing trabecular structures. METHODS: Two human mandibles were scanned by micro-CT (Skyscan 1173 high-energy spiral scan micro-CT; Skyscan NV, Kontich, Belgium) and CBCT (3D Accuitomo 170; Morita, Japan). The CBCT images were reconstructed with 0.5 and 1 mm thicknesses. The condylar images were selected for registration. A parallel algorithm for histogram computation was introduced to perform the registration...
April 26, 2017: Dento Maxillo Facial Radiology
Abbas Shokri, Amirfarhang Miresmaeili, Nasrin Farhadian, Sepideh Falah-Kooshki, Payam Amini, Najmeh Mollaie
OBJECTIVES: This study aimed to assess the effect of head position on the accuracy of transverse measurements of the maxillofacial region on CBCT and conventional posteroanterior (PA) cephalograms. The second objective of this study was to find skull positions with the greatest and smallest effect on transverse measurements in the maxillofacial region. METHODS: PA cephalograms and CBCT scans were obtained from 10 dry human skulls in 7 positions, namely the central position, 10° and 20° rotations, 10° and 20° tilts and 10° and 20° tips...
April 12, 2017: Dento Maxillo Facial Radiology
Abeer A Almashraqi, Eman A Ahmed, Nashwa S Mohamed, Imad H Barngkgei, Nader A Elsherbini, Esam S Halboub
OBJECTIVES: This in vitro study aimed to assess radiation dose and image quality of different low-dose multidetector CT (MDCT) and CBCT imaging protocols in comparison with the standard MDCT protocol for maxillary sinus imaging. METHODS: Effective dose (E) and image quality of 10 MDCT (changing effective milliampere second starting from 141.3 EmAs to 20 EmAs) and 3 CBCT protocols (changing milliampere second and voxel size) were assessed throughout scanning an anthropomorphic head and neck Alderson Rando phantom...
April 12, 2017: Dento Maxillo Facial Radiology
Sung-Hun Kim, Youn-Kyung Choi, Sang Min Shin, Yong-Seok Choi, Tetsutaro Yamaguchi, Masahiro Takahashi, Koutaro Maki, Soo-Byung Park, Yong-Il Kim
OBJECTIVE: To propose a skeletal maturity assessment method by developing a statistical regression analysis model through the integration of lateral and axial images of cervical vertebrae of cleft lip and palate (CLP) patients obtained through cone beam computed tomography (CBCT). METHODS: Forty-nine patients with CLP (28 females, 21 males; age range, 4-16 years) who had CBCT and hand-wrist radiographic data were selected. With the landmarks' coordinates from lateral and axial images of cervical vertebrae, Procrustes analysis and principal components analysis yielded principal component (PC) scores of each cervical vertebra, with the centroid size as the size factor...
April 6, 2017: Dento Maxillo Facial Radiology
Saeid Safiri, Erfan Ayubi
No abstract text is available yet for this article.
April 4, 2017: Dento Maxillo Facial Radiology
Michele M Vidor, Gabriela S Liedke, Mariana B Vizzotto, Heraldo L D da Silveira, Priscila F da Silveira, Cristiano W Araujo, Heloisa E D da Silveira
OBJECTIVES: To analyze the diagnostic accuracy of conventional and digital radiographic images and the impact of digital filters in evaluating the bone-implant interface. METHODS: Titanium implants were inserted into 74 fresh bovine ribs blocks, 37 fitting tight to the bone walls (simulating the existence of osseointegration) and 37 with a gap of 0.125 mm (simulating a failure in the osseointegration process). Periapical radiographs were taken with conventional film and two phosphor plate systems [VistaScan(®) (Dürr Dental, Bietigheim-Bissingen, Germany) and Express(®) (Instrumentarium, Tuusula, Finland)]...
March 28, 2017: Dento Maxillo Facial Radiology
Arthur H Friedlander, Lindsay L Graves, Shannon G Grabich, Nona Aghazadehsanai, Tina I Chang
OBJECTIVES: Given the enhanced risk of ischaemic stroke resulting from the direct effects of hyperuricaemia on vascular plaque formation seen among older males with gout, we sought to determine the prevalence of calcified carotid artery atheromas (CCAAs) on their panoramic images (PIs). METHODS: Medical record librarians identified all male patients over 45 years, who had a diagnosis of gout and a PI incidentally obtained between 2000 and 2015. The prevalence rate of CCAA on technically appropriate images was determined, as were these patients' atherogenic risk profiles including: age, body mass index, hypertension and dyslipidaemia...
March 28, 2017: Dento Maxillo Facial Radiology
Luciana Munhoz, Arthur R G Cortes, Emiko S Arita
OBJECTIVES: To analyze the influence of Type 2 diabetes on bone mineral density (BMD) and panoramic radiomorphometry in postmenopausal females, comparing with results from non-diabetic postmenopausal females. METHODS: A total of 228 postmenopausal females (mean age: 59.51 ± 11.08 years) were included in this study. Demographics, T scores and Z scores from peripheral dual X-ray absorptiometry (DXA) and mandibular cortical index (MCI) from panoramic radiographs were assessed...
March 28, 2017: Dento Maxillo Facial Radiology
Dongzhe Song, Lan Zhang, Wei Zhou, Qinghua Zheng, Xingyu Duan, Xuedong Zhou, Dingming Huang
OBJECTIVES: The aim of this study was to verify whether there is a difference in the in vivo performance characteristics of CBCT and periapical radiography (PR) in assessing the apical extension of root canal obturation (RCO) and to evaluate the ability of CBCT in void detection using microsurgical findings as validation. METHODS: This study included 323 tooth roots that required surgical treatment and for which pre-existing periapical radiographs and CBCT images were available...
March 23, 2017: Dento Maxillo Facial Radiology
Supak Ngamsom, Shin Nakamura, Junichiro Sakamoto, Shinya Kotaki, Akemi Tetsumura, Tohru Kurabayashi
OBJECTIVES: To quantitatively evaluate diffusion and perfusion status of lateral pterygoid muscle (LPM) in patients with temporomandibular joint disorder (TMD) by intravoxel incoherent motion (IVIM) imaging and to correlate with findings on temporomandibular joints (TMJs) by conventional MRI. METHODS: 42 patients with TMD underwent MRI. To assess IVIM parameters, diffusion-weighted imaging was obtained by spin-echo-based single-shot echoplanar imaging. Regions of interest were created on all diffusion-weighted images of the superior belly of the lateral pterygoid (SLP) and inferior belly of the lateral pterygoid (ILP) at b-values 0-500 s mm(-2)...
March 23, 2017: Dento Maxillo Facial Radiology
Juha Koivisto, Maureen van Eijnatten, Jorma Järnstedt, Kirsi Holli-Helenius, Prasun Dastidar, Jan Wolff
OBJECTIVES: To assess the impact of supine, prone and oblique patient imaging positions on the image quality, contrast-to-noise ratio and figure of merit value in the maxillofacial region using a cone beam computed tomography scanner. Furthermore, the CBCT supine images were compared to supine MSCT images. METHODS: One fresh frozen cadaver head was scanned in prone, supine and oblique imaging positions using a mobile CBCT scanner. MSCT images of the head were acquired in a supine position...
March 17, 2017: Dento Maxillo Facial Radiology
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