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https://www.readbyqxmd.com/read/29231055/effect-of-anatomical-region-on-the-formation-of-metal-artifacts-produced-by-dental-implants-in-cone-beam-computed-tomographic-images
#1
Alessiana Helena Machado, Karolina Aparecida Castilho Fardim, Camila Furtado de Souza, Bruno Salles Sotto-Maior, Neuza Maria Souza Picorelli Assis, Karina Lopes Devito
OBJECTIVES: To quantitatively compare metal artifacts produced by implants in different maxillomandibular regions on cone beam computed tomography (CBCT) images. METHODS: A total of 200 implants selected from CBCT examinations were divided into four groups: Group 1 (n = 50) - implants located in the anterior maxilla; Group 2 (n = 50) - implants located in the posterior maxilla; Group 3 (n = 50) - implants located in the anterior mandible; and Group 4 (n = 50) - implants located in the posterior mandible...
December 12, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29229454/impact-of-cone-beam-computed-tomography-on-treatment-planning-for-external-cervical-resorption-and-a-novel-axial-slice-based-classification-system
#2
Kurt B Goodell, Pete Mines, Daniel D Kersten
INTRODUCTION: The aim of this study was to compare treatment plans for external cervical resorption (ECR) developed from periapical (PA) radiographs and cone-beam computed tomographic (CBCT) imaging. The secondary aim of this study was to test a new classification system for ECR based on CBCT axial slice analysis. METHODS: ECR was identified in 56 teeth (47 patients) from a database of 928 CBCT images. Strict exclusion criteria resulted in a sample of 30 ECR teeth (25 patients) and 10 ECR-free control teeth...
December 8, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29229071/branching-of-mandibular-canal-on-cone-beam-computed-tomography-images
#3
Masoomeh Afsa, Hamid Rahmati
BACKGROUND: Mandibular neurovascular canal contents may be vulnerable to damage during mandibular surgical procedures. Greater knowledge of the location and configuration of the mandibular canal can help in the safe performance of these procedures in the dental clinic. Cross-sectional CBCT imaging is a good modality for studying the course, location, configuration and accessory branches of the mandibular canal. The aim of this study was to observe the branching of the mandibular canal at different segments of the mandible and mandibular tooth groups...
December 2017: Singapore Dental Journal
https://www.readbyqxmd.com/read/29227324/three-dimensional-evaluation-on-the-effect-of-maxillary-dentition-distalization-with-miniscrews-implanted-in-the-infrazygomatic-crest
#4
Xiaoxue Wu, Haibo Liu, Chen Luo, Yonggang Li, Yin Ding
OBJECTIVE: To evaluate the effect of the maxillary dentition distalization with miniscrews implanted in the infrazygomatic (IZ) crest with 3D reconstruction module from cone-beam computed tomography (CBCT). METHODS: Twenty patients who previously underwent dentition distalization treatment with miniscrews were recruited. A total of 40 images were obtained using CBCT, taken immediately before placement of the miniscrew anchorage and at the end of distalization. The 3D-line measurements were recorded to monitor dental changes...
December 7, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/29226129/the-relationship-between-dental-follicle-width-and-maxillary-impacted-canines-descriptive-and-resorptive-features-using-cone-beam-computed-tomography
#5
İlhan Metin Dağsuyu, Rıdvan Okşayan, Fatih Kahraman, Mehmet Aydın, İbrahim Şevki Bayrakdar, Mehmet Uğurlu
Objectives: To assess the relationship between dental follicle width and maxillary impacted canines' descriptive and resorptive features with three-dimensional (3D) cone-beam computed tomography (CBCT). Methods: The study comprised 102 patients with cone-beam computed tomography 3D images and a total of 140 impacted canines. The association between maxillary impacted canine dental follicle width and the variables of gender, impaction side (right and left), localization of impacted canine (buccal, central, and palatal), and resorption of the adjacent laterals was compared...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29225654/clinical-approach-to-pulp-canal-obliteration-a-case-series
#6
Kenia Maria Soares de Toubes, Patrícia Alves Drummond de Oliveira, Stephanie Nicácio Machado, Vânia Pelosi, Eduardo Nunes, Frank Ferreira Silveira
This article describes four cases with safe and feasible clinical treatment strategies for anterior teeth with pulp canal obliteration (PCO) using cone-beam computed tomography (CBCT), digital radiography (DR), dental operating microscopy (DOM) and ultrasonic tips (US). Four anterior teeth with PCO were chosen. DR was taken with different angulations and analyzed with different filters. Subsequently, the access cavity was performed with the aid of DOM. If the canal was not identified, CBCT was requested. Sagittal and axial slices guided the direction of the ultrasonic tips...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29225652/repair-of-iatrogenic-furcal-perforation-with-mineral-trioxide-aggregate-a-seven-year-follow-up
#7
Jardel Camilo do Carmo Monteiro, Mateus Rodrigues Tonetto, Matheus Coêlho Bandeca, Alvaro Henrique Borges, José Cláudio Martins Segalla, Keren Cristina Fagundes Jordão-Basso, Cristian Fernando Sanchez-Puetate, Milton Carlos Kuga
Teeth with furcal perforation present difficult resolution and dubious prognosis. Several materials have been proposed and calcium silicate-based cements such as mineral trioxide aggregate (MTA) are the most recommended. However, its long-term clinical behavior still remains poorly understood. The present study reports a clinical case of furcal perforation repair using Angelus MTA, with a 7-year follow-up. Patient sought treatment 2 months after iatrogenic accident. First lower right molar presented clinical signs such as fistula and bone loss between mesial and distal roots...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29225636/evaluation-of-the-prevalence-of-complete-isthmii-in-permanent-teeth-using-cone-beam-computed-tomography
#8
Sina Haghanifar, Ehsan Moudi, Zahrasadat Madani, Foroozan Farahbod, Ali Bijani
Introduction: The current study aimed at determining the prevalence of complete isthmii in permanent teeth, using cone-beam computed tomography (CBCT) in a selected Iranian community. Methods and Materials: In this cross sectional study, 100 CBCT images (from 58 female and 42 male patients) including 1654 teeth (809 maxillary and 845 mandibular teeth) were evaluated. Each tooth root was evaluated in axial plane (interval, 0.1 mm; thickness, 0.1 mm) from the orifice to the apex and from the apex to the orifice to detect the presence of complete isthmus...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29224195/prevalence-of-soft-tissue-calcifications-in-the-maxillofacial-region-detected-by-cone-beam-ct
#9
Eucaé Miranda Missias, Eduarda Helena Leandro Nascimento, Maria Luiza Dos Anjos Pontual, Andréa Dos Anjos Pontual, Deborah Queiroz Freitas, Danyel Elias da Cruz Perez, Flávia Maria de Moraes Ramos-Perez
OBJECTIVE: To determine the prevalence of soft tissue calcifications in cone beam computed tomography (CBCT) scans with different fields of view (FOV), and to assess its relation with the clinical relevance of the CBCT findings. MATERIAL AND METHODS: One thousand CBCT scans were grouped according to FOV's size and region scanned (MX-FOV, maxilla; MD-FOV, mandible; and MM-FOV, maxilla/mandible) and evaluated for the presence of soft tissue calcifications. Laterality and length of the elongated styloid processes (ESP) were also assessed...
December 10, 2017: Oral Diseases
https://www.readbyqxmd.com/read/29221150/comparison-of-gross-tumor-volume-of-primary-oesophageal-cancer-based-on-contrast-enhanced-three-dimensional-four-dimensional-and-cone-beam-computed-tomography
#10
Chao-Yue Hu, Jian-Bin Li, Jin-Zhi Wang, Wei Wang, Feng-Xiang Li, Yan-Luan Guo
Background: To explore motion information included in 3DCT, 4DCT and CBCT by comparing volumetric and positional differences of GTV. Results: Independent of tumor location, significant differences were observed among volumes [IGTV10 > (IGTVCBCT or IGTVMIP) > (GTV3D or GTV4D50)]. The underestimations or overestimations between IGTV10 and IGTVCBCT were larger than those between IGTV10 and IGTVMIP (p < 0.001-0.011; p < 0.001-0.023). For upper oesophageal tumors, GTV4D50/IGTVCBCT negatively correlated with motion vector (r = -0...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29220725/sparse-view-neutron-photon-computed-tomography-object-reconstruction-and-material-discrimination
#11
Ali Pour Yazdanpanah, Jessica Hartman, Emma Regentova, Alexander Barzilov
Taking into account the advantages of both neutron- and photon-based systems, we propose combined neutron-photon computed tomography (CT) under a sparse-view setting and demonstrate its performance for 3D object visualization and material discrimination. We use a high-performance regularization method for CT reconstruction by combining regularization based on total variation (TV) and curvelet transform in cone beam geometry. It is coupled with proposed 2D material signatures which is pairs of photon to neutron transmission ratios and neutron transmission values per object space voxels...
November 28, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29216869/horizontal-ridge-reconstruction-of-the-anterior-maxilla-using-customized-allogeneic-bone-blocks-with-a-minimally-invasive-technique-a-case-series
#12
Laurent Venet, Michel Perriat, Francesco Guido Mangano, Thomas Fortin
BACKGROUND: Different surgical procedures have been proposed to achieve horizontal ridge reconstruction of the anterior maxilla; all these procedures, however, require bone replacement materials to be adapted to the bone defect at the time of implantation, resulting in complex and time-consuming procedures. The purpose of this study was to describe how to use a 3D printed hardcopy model of the maxilla to prepare customized milled bone blocks, to be adapted on the bone defect areas using a minimally invasive subperiosteal tunneling technique...
December 8, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/29216174/spatiotemporal-diffraction-free-pulsed-beams-in-free-space-of-the-airy-and-bessel-type
#13
Nikolaos K Efremidis
We investigate the dynamics of spatiotemporal optical waves with one transverse dimension obtained as the intersections of the dispersion cone with a plane. We show that, by appropriate spectral excitations, the three different types of conic sections (elliptic, parabolic, and hyperbolic) can lead to optical waves of the Bessel, Airy, and modified Bessel types, respectively. We find closed form solutions that accurately describe the wave dynamics and unveil their fundamental properties.
December 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/29216024/maxillary-cortical-bone-thickness-in-a-south-eastern-anatolian-population-a-cone-beam-computed-tomography-study
#14
Ozkan Adiguzel, Ceren Aktuna Belgin, Seda Falakaloglu, Suzan Cangul, Zeki Akkus
BACKGROUND The aim of this study was to measure the distance between the maxillary premolar and molar teeth apices to the buccal cortical bone and evaluate differences in gender and age group, using cone beam computed tomography (CBCT). MATERIAL AND METHODS This retrospective study comprised of 451 premolar and molar teeth of one hundred and thirteen patients who were admitted to Dicle University, Faculty of Dentistry, Department of Dentomaxillofacial Radiology for different reasons. Data were analyzed using Student's t-tests and Tukey HSD tests...
December 7, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29215680/effects-of-zoledronic-acid-in-experimental-periapical-lesions-in-rats-an-imaging-and-histological-analysis
#15
Talita Ribeiro Tenório de França, Flávia Maria de Moraes Ramos-Perez, Andrea Dos Anjos Pontual, Jurema Freire Lisboa de Castro, Paulo Rogério Ferreti Bonan, Danyel Elias da Cruz Perez
The aim of this study was to assess the imaging and histological features of experimental periapical lesions, including the adjacent alveolar bone, in rats under zoledronic acid treatment. The study used 40 male Wistar rats distributed into 8 groups of 5 animals each: G1: induction of periapical lesion (PL) and weekly intraperitoneal administration (WIPA) of saline solution (0.9% NaCl) for 4 weeks; G2: PL induction and WIPA of zoledronic acid (0.15 mg/kg/week) for 4 weeks; G3: PL induction and WIPA of saline solution for 8 weeks; G4: PL induction and WIPA of zoledronic acid for 8 weeks; G5:WIPA of saline solution for 4 weeks and subsequent PL induction; G6: WIPA of zoledronic acid for 4 weeks and subsequent PL induction; G7: WIPA of saline solution for 8 weeks and subsequent PL induction; G8: WIPA of zoledronic acid for 8 weeks and subsequent PL induction...
September 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29215439/age-related-volumetric-changes-in-mandibular-condyles
#16
Ali-Farid Safi, Martin Kauke, Andrea Grandoch, Hans-Joachim Nickenig, Joachim E Zöller, Matthias Kreppel
A precise knowledge of the condylar changes with advancing age may improve understanding of pathophysiological alterations of the mandibular condyles. However, the majority of studies focusses on morphological changes, although volumetric analysis based upon cone beam computerized tomography may provide important additional data to characterize mandibular condyles. Therefore, we aimed to provide and compare volumetric data of mandibular condyles of a young and old patient group. This is a retrospective chart review of 195 patients with cone beam computerized tomography between 2007 and 2016...
December 6, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29215437/volumetric-analysis-of-700-mandibular-condyles-based-upon-cone-beam-computed-tomography
#17
Ali-Farid Safi, Martin Kauke, Andrea Grandoch, Hans-Joachim Nickenig, Joachim E Zöller, Matthias Kreppel
The authors' aim was to provide volumetric data of mandibular condyles based upon cone beam computed tomography with the means of semiautomatic segmentation.Retrospective chart review of 350 patients (700 mandibular condyles) with cone beam computerized tomography between February 2007 and December 2016. Univariate analysis was performed to analyze associations between variables. P values <0.05 were considered significant. Volume measurement was performed in a semiautomatic segmentation method with the program "ITK-Snap...
December 6, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29214631/system-matrix-computation-vs-storage-on-gpu-a-comparative-study-in-cone-beam-ct
#18
Dmitri Matenine, Geoffroi Côté, Julia Mascolo-Fortin, Yves Goussard, Philippe Després
PURPOSE: Iterative reconstruction algorithms in computed tomography (CT) require a fast method for computing the intersection distances between the trajectories of photons and the object, also called ray-tracing or system matrix computation. This work focused on the thin-ray model and is aimed at comparing different system matrix handling strategies using graphical processing units (GPUs). METHODS: In this work, the system matrix is modeled by thin rays intersecting a regular grid of box-shaped voxels, known to be an accurate representation of the forward projection operator in CT...
December 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/29209669/comparison-of-alveolar-ridge-splitting-and-autogenous-onlay-bone-grafting-to-enable-implant-placement-in-patients-with-atrophic-jaw-bones
#19
Gokhan Gurler, Cagri Delilbasi, Hasan Garip, Sukran Tufekcioglu
To compare alveolar ridge splitting (ARS) and autogenous onlay bone grafting (AOBG) in atrophic jaw bones.  Methods: Forty patients were included in this retrospective, parallel-group study conducted at the Istanbul Medipol University School of Dentistry, Istanbul, Turkey, between 2012-2015. The initial bone thickness was measured by cone beam computed tomography (CBCT). Patients were allocated into ARS (n=17) and AOGB (n=23) groups on the basis of ridge thickness and shape. Follow-up CBCT measurements to assess horizontal bone were repeated 4 to 6 months post augmentation...
December 2017: Saudi Medical Journal
https://www.readbyqxmd.com/read/29207839/evaluation-of-effect-of-irrigants-with-or-without-surfactant-on-root-canal-transportation-by-cone-beam-computed-tomography-an-in-vitro-study
#20
Siddiq Ahmed, Prabu Mahin Syed Ismail, M Chandra Sekhar, Sampathi Naga Lakshmi Reddy, Moosani Gopi Krishna, Upendra Natha Reddy, Kalla Nikhita, P Sai Harish
Introduction: Maintenance of original canal anatomy with proper disinfection is our primary goal to achieve during root canal instrumentation. Surfactants are added to irrigating solution to promote deeper penetration into dentinal tubules. Aim: The aim of this study was to evaluate the influence of addition of surfactants to Sodium Hypochlorite (NaOCl) and Ethylenediaminetetraacetic Acid (EDTA) on transportation of root canal. Materials and Methods: Fifty human mandibular molars with mesial root curvatures of 10° - 40° were selected and embedded in silicone impression material to simulate mandibular arch form to facilitate imaging process and maintain reproducibility of images...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
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