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https://www.readbyqxmd.com/read/28808749/bioxmark-for-high-precision-radiotherapy-in-an-orthotopic-pancreatic-tumor-mouse-model-experiences-with-a-liquid-fiducial-marker
#1
S Dobiasch, S Kampfer, R Burkhardt, D Schilling, T E Schmid, J J Wilkens, S E Combs
BACKGROUND AND PURPOSE: High-precision radiotherapy (RT) requires precise positioning, particularly with high single doses. Fiducial markers in combination with onboard imaging are excellent tools to support this. The purpose of this study is to establish a pancreatic cancer mouse model for high-precision image-guided RT (IGRT) using the liquid fiducial marker BioXmark (Nanovi, Kongens Lyngby, Denmark). METHODS: In an animal-based cancer model, different volumes of BioXmark (10-50 µl), application forms, and imaging modalities-cone-beam computer tomography (CBCT) incorporated in either the Small Animal Radiation Research Platform (SARRP) or the small-animal micro-CT Scanner (SkyScan; Bruker, Brussels, Belgium)-as well as subsequent RT with the SARRP system were analyzed to derive recommendations for BioXmark...
August 14, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28808473/failure-of-cone-beam-computed-tomography-in-detection-of-fiber-post-perforation
#2
Mahta Fazlyab, Saeed Asgary
Detection of iatrogenic root perforation during post-space preparation especially in labiolingual plane can be challenging due to the two-dimensional nature of conventional radiography; this can be even more challenging if the cemented post is radiolucent. Cone-beam computed tomography (CBCT) scans were shown to be a valuable diagnostic aid in diagnosis of such cases. However, in this case, the application of CBCT did not help in diagnosis of a labial fiber post perforation in a maxillary central incisor which was finally detected through exploratory surgery...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808472/successful-ultra-conservative-management-of-a-mandibular-premolar-with-dens-invaginatus
#3
Ramin Abazarpour, Masoud Parirokh, Aida Farhadi, Zahra Jalali, Nasir Kheirabadi
Dens invaginatus is one of the most common anomalies of tooth structure. It is caused by the invagination of the crown surface during odontogenesis that enters the pulp chamber of the affected tooth. Depending on the complexity of invagination, the tooth might present with pulp necrosis, open apex and a complicated root canal system. This case report presents an Oehlers' type 2 dens-invaginatus in a mandibular premolar with chronic apical abscess. In most cases, dens invaginatus is removed during treatment...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808471/management-of-invasive-cervical-root-resorption-in-a-mandibular-canine-using-biodentine-as-a-restorative-material-a-case-report
#4
Leila Eftekhar, Hengameh Ashraf, Sanaa Jabbari
Invasive cervical root resorption (ICR) is the reversible/irreversible loss of tooth structure in the connective tissue attachment zone with unclear etiology. In the present case a history of periodontal surgery was presumed to be the predisposing factor. Early diagnosis and proper treatment may lead to long-term retention of the tooth. The tooth is usually asymptomatic and diagnosis is commonly made as a result of a routine radiographic finding. Cone-beam computed tomography (CBCT) is extremely useful in diagnosis and treatment planning of ICR...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808469/endodontic-surgery-of-a-symptomatic-overfilled-mta-apical-plug-a-histological-and-clinical-case-report
#5
Saeed Asgary, Sara Fayazi
This case report presents the successful surgical treatment of a symptomatic open apex upper central incisor with a failed overfilled mineral trioxide aggregate (MTA) apical plug. Unintentional overextension of the MTA had occurred two years before the initial visit. An apical lesion adjacent to the excess MTA was radiographically detectable. Endodontic surgery was performed using calcium-enriched mixture (CEM) cement as a root-end filling material. Curettage of the apical lesion showed a mass of unset MTA particles; histopathological examination revealed fragments of MTA and granulation tissues...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808468/treatment-of-a-maxillary-second-molar-with-one-buccal-and-two-palatal-roots-confirmed-with-cone-beam-computed-tomography
#6
Masoud Parirokh, Mahsa Razifar, Hamed Manochehrifar, Paul V Abbott, Nima Hatami, Nargessaddat Kashi, Aida Farhadi
Root canal configuration is an important subject in endodontic practice and dentists should be familiar with all possible types of root canal configuration. A forty-three year old male was referred for root canal treatment of his maxillary left second molar tooth with symptomatic irreversible pulpitis. Pre-operative radiographs showed a three rooted molar. However, after access cavity preparation two palatal and one buccal orifices were detected. The patient was informed of the unusual root canal anatomy and cone-beam computed tomography (CBCT) was ordered for precise evaluation of the anatomy...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808452/root-morphology-and-canal-configuration-of-first-and-second-maxillary-molars-in-a-selected-iranian-population-a-cone-beam-computed-tomography-evaluation
#7
Abbasali Khademi, Asieh Zamani Naser, Zahra Bahreinian, Mojdeh Mehdizadeh, Mojtaba Najarian, Saber Khazaei
INTRODUCTION: The aim of this investigation was to evaluate root canal morphology of maxillary first and second molars and also to assess the prevalence and morphology of the second mesiobuccal canal (MB2) in these teeth, using cone-beam computed tomography (CBCT). METHODS AND MATERIALS: In this cross-sectional study, the total of 470 CBCT images from the archive of Radiology Department of Isfahan University of Medical Sciences (IUMS), Iran, was evaluated and 295 images were selected...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28807441/whole-body-dose-and-energy-measurements-in-radiotherapy-by-a-combination-of-lif-mg-cu-p-and-lif-mg-ti
#8
Pascal Hauri, Uwe Schneider
PURPOSE: Long-term survivors of cancer who were treated with radiotherapy are at risk of a radiation-induced tumor. Hence, it is important to model the out-of-field dose resulting from a cancer treatment. These models have to be verified with measurements, due to the small size, the high sensitivity to ionizing radiation and the tissue-equivalent composition, LiF thermoluminescence dosimeters (TLD) are well-suited for out-of-field dose measurements. However, the photon energy variation of the stray dose leads to systematic dose errors caused by the variation in response with radiation energy of the TLDs...
August 11, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28807372/accuracy-of-orthopantomography-for-apical-periodontitis-without-endodontic-treatment
#9
Cosimo Nardi, Linda Calistri, Silvia Pradella, Isacco Desideri, Chiara Lorini, Stefano Colagrande
INTRODUCTION: This study aimed to evaluate the diagnostic accuracy of orthopantomography (OPT) for the detection of clinically/surgically confirmed apical periodontitis (AP) without endodontic treatment using cone-beam computed tomographic (CBCT) imaging as the reference standard. METHODS: One hundred twenty patients without endodontically treated AP (diseased group) were detected via CBCT imaging using the periapical index system. They were divided into groups of 10 each according to the size of the lesion (2-4...
August 11, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28806496/anterior-superior-alveolar-nerve-injury-after-extended-endoscopic-medial-maxillectomy-a-preclinical-study-to-predict-neurological-morbidity
#10
Alberto Schreiber, Davide Mattavelli, Marco Ferrari, Vittorio Rampinelli, Davide Lancini, Marco Ravanelli, Giacomo Bertazzoni, Luigi Fabrizio Rodella, Barbara Buffoli, Francesco Doglietto, Piero Nicolai
BACKGROUND: Endoscopic medial maxillectomies (EMMs) are used to optimize exposure of the maxillary sinus and retromaxillary areas. Although in type D EMM (Sturmann-Canfield procedure) the anterior superior alveolar nerve (ASAN) is always at risk of injury, only 29% of patients complained of alveolar process and dental anesthesia. The purpose of this anatomical study is to assess the neural anastomotic network of the ASAN (ASAN-NAN) and describe different extensions of type D EMMs in a preclinical setting...
August 14, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28803806/the-use-of-computer-assisted-corticotomy-to-enhance-surgical-procedures
#11
Marco Finotti, Antonio Gracco, Mariarosa Del Torre, Laura Siviero, Alberto de Stefani, Giovanni Bruno
In recent years, several surgical techniques have been proposed with the main goal of reducing the length of orthodontic treatment. Some of these techniques use a piezoelectric surgical instrument to perform alveolar bone cuts and promote localized bone turnover. One of the main limitations of these surgical techniques is that corticotomies may damage dental roots since traditional radiographic examinations do not allow the surgeon to precisely determine the length and three-dimensional position of the roots...
August 10, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28803737/cone-beam-computed-tomography-based-cephalometric-norms-for-brazilian-adults
#12
R M G Santos, J M De Martino, F Haiter Neto, L A Passeri
This study established cone beam computed tomography (CBCT)-based cephalometric norms for Brazilian adults, including the assessment of sexual dimorphism. An observer performed McNamara's cephalometric analysis twice on 60 CBCT datasets acquired from patients with a normal dental occlusion, divided equally into two groups by sex. Welch's t-test was applied to assess differences between the sexes in hard tissue cephalometric measurements, and Dahlberg's formula was used to calculate measurement error introduced by the observer...
August 10, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28798929/accuracy-of-bone-measurements-in-the-vicinity-of-titanium-implants-in-cbct-data-sets-a-comparison-of-radiological-and-histological-findings-in-minipigs
#13
Alexander Gröbe, Jan Semmusch, Maximilian Schöllchen, Henning Hanken, Michael Hahn, Wolfgang Eichhorn, Gerhard Schön, Ole Jung, Jamal M Stein, Aline Reitmeier, Max Heiland, Ralf Smeets, Clarissa Precht
PURPOSE: The aim of this animal study was the determination of accuracy of bone measurements in CBCT (cone-beam computed tomography) in close proximity to titanium implants. MATERIAL AND METHODS: Titanium implants were inserted in eight Göttingen minipigs. 60 implants were evaluated histologically in ground section specimen and radiologically in CBCT in regard to thickness of the buccal bone. With random intercept models, the difference of histologic measurements and CBCT measurements of bone thickness was calculated...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28797999/long-term-results-of-post-operative-pelvic-image-guided-intensity-modulated-radiotherapy-in-gynecological-malignancies
#14
Rashi Agrawal, Sowmiya Prithiviraj, Dinesh Singh, Vaishali Zamre, Sandeep Agrawal, Arun Kumar Goel, Kanika Gupta, Bala Subramanian
OBJECTIVE: To assess late clinical outcomes with image guided intensity modulated radiotherapy (IG- IMRT) in gynecological malignancies. PATIENTS AND METHODS: We have been practicing IG IMRT for gynecological malignancies since January 2009. Here we are presenting our experience with this modern technique at median follow up of 38 months. During whole treatment bladder filling protocol was followed. Both target volumes and critical structures were contoured according to RTOG guidelines...
May 2017: Gulf Journal of Oncology
https://www.readbyqxmd.com/read/28794810/cone-beam-computed-tomography-study-of-root-canal-morphology-of-permanent-mandibular-incisors-in-indian-subpopulation
#15
Gaurav Ravishankar Verma, Chetan Bhadage, Ajay R Bhoosreddy, Priyanka R Vedpathak, Gayatri P Mehrotra, Ashwini C Nerkar, Akanksha Bhandari, Shweta Chaubey
BACKGROUND: The aim of the study was to determine the root canal morphology of permanent mandibular incisor teeth in the Indian subpopulation with the use of cone beam computed tomography (CBCT). MATERIAL/METHODS: CBCT images of 200 patients with 800 permanent mandibular incisors, fulfilling necessary inclusion criteria and aged 18 to 60 years were evaluated. The number of roots, number of root canals and canal configuration were investigated and then classified according to Vertucci's classification of root canals...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28791305/rapid-maxillary-expansion-and-upper-airway-morphology-a-systematic-review-on-the-role-of-cone-beam-computed-tomography
#16
REVIEW
Gabriele Di Carlo, Matteo Saccucci, Gaetano Ierardo, Valeria Luzzi, Francesca Occasi, Anna Maria Zicari, Marzia Duse, Antonella Polimeni
OBJECTIVE: This study aimed to investigate the quality of cone beam computed tomography (CBCT) studies evaluating the effects of rapid maxillary expansion on upper airway morphology. MATERIALS AND METHODS: A database search was conducted using PubMed, Ovid, and Cochrane Library up to December 2016. Studies in which CBCT was adopted to visualize the upper airway before and after rapid maxillary expansion were included. The population target was growing patients. Methodological quality assessment was performed...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28791294/the-use-of-cone-beam-computed-tomography-in-assessing-the-insertion-of-bone-conduction-hearing-implants
#17
Tim George Ate Calon, Martin Lars Johansson, Elske Larissa van den Burg, Anna Maria Louisa Janssen, Marc van Hoof, Robert Jan Stokroos
OBJECTIVE: This study aimed to compare postoperative cone beam CT (CBCT) imaging to implant stability quotient (ISQ) measurement and direct caliper measurements as a suitable technique to assess bone conduction hearing implant (BCHI) seating and insertion depth. METHODS: In vitro, BCHIs were completely (n = 9) and partially inserted (n = 9) in bone blocks of different densities and subsequently scanned. Scans were processed using 3DSlicer 4.3.1 and Mathematica 10...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/28789933/radiation-protection-in-dental-radiology-recent-advances-and-future-directions
#18
V Tsapaki
Dental radiology uses X-ray technology to diagnose and design treatment of various clinical problems related to the oral cavity and surrounding tissues. As technology quickly evolves, there are numerous X-ray modalities using different tools in the attempt to best image and treat efficiently these diseases, disorders or other related clinical conditions. The reported numbers of dental X-rays, the fact that these may be under-reported in many countries and because dental X-rays are performed more on younger individuals, whose teeth and dentition are still developing, calls for increased need on radiation protection...
August 5, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28781156/evaluation-of-deformed-image-based-dose-calculations-for-adaptive-radiotherapy-of-nasopharyngeal-carcinoma
#19
Miranda Poon, Catherine Holborn, Ka Fai Cheng, Winky Wing Ki Fung, George Chiu
The ultimate goal of adaptive radiotherapy (ART) is to deliver truly customized radiation treatments. Currently, the quality of cone-beam computed tomography (CBCT) images is still inferior to that of conventional CT images in contour delineations and dose calculations for replanning purposes. This retrospective study aims to evaluate the dosimetric accuracy of using deformed conventional CT images for dose calculations, in the hope of inferring the feasibility of ART using planning CT (PCT) images that deformed to up-to-date CBCT images for patients with nasopharyngeal carcinoma (NPC)...
August 3, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28778178/a-novel-cbct-based-method-for-derivation-of-ctv-ptv-margins-for-prostate-and-pelvic-lymph-nodes-treated-with-stereotactic-ablative-radiotherapy
#20
Ciara A Lyons, Raymond B King, Sarah O S Osman, Stephen J McMahon, Joe M O'Sullivan, Alan R Hounsell, Suneil Jain, Conor K McGarry
BACKGROUND: Traditional CTV-PTV margin recipes are not generally applicable in the situation of stereotactic ablative radiotherapy (SABR) treatments of multiple target volumes with a single isocentre. In this work, we present a novel geometric method of margin derivation based on CBCT-derived anatomical data. METHODS: Twenty patients with high-risk localized prostate cancer were selected for retrospective review. Individual volumes of interest (prostate, prostate and seminal vesicles and pelvic lymph nodes) were delineated on five representative CBCTs and registered to the planning CT using two registration protocols: bone match or prostate-based soft tissue match...
August 4, 2017: Radiation Oncology
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