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Ishita Wanikar, Surekha Rathod, Abhay P Kolte
BACKGROUND: The treatment of molar furcation involvement is unpredictable due to the complex anatomy and poor access for instrumentation. Previous studies have reported successful regeneration with endogenous regenerative material such as platelet rich fibrin (PRF) and bisphosphonates as alendronate (ALN). Hence, the present study was aimed to evaluate clinically and radiographically the efficacy of 1% ALN gel in combination with PRF (PRF+ALN) and PRF alone in the treatment of grade II furcation defects...
July 14, 2018: Journal of Periodontology
Marco Ertreo, Hailey Choi, David Field, Jonathan W Lischalk, Emil Cohen, George E Lynskey, Theresa Caridi, Donna Buckley, Keith Unger, Alexander Y Kim
PURPOSE: To compare the use of cone-beam computed tomography versus contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI) in the calculation of liver volume and planned dose for yttrium-90 radioembolization. MATERIALS AND METHODS: The study retrospectively assessed 47 consecutive patients who underwent resin Y-90 radioembolization consecutively over a 2-year period at a single center. Volume calculation software was used to determine perfused lobar liver volumes from cone-beam CT (CBCT) images obtained during mapping angiography...
July 13, 2018: Cardiovascular and Interventional Radiology
Wilana da Silva Moura, Kelly Chiqueto, Gustavo Menezes Pithon, Leniana Santos Neves, Renata Castro, José Fernando Castanha Henriques
INTRODUCTION: Due to potential impact of the effects of ionizing radiation used in medical and dental examinations on public health in recent years, many studies are being conducted to quantify the radiation dose values, evaluate scanners, and indicate factors that could influence or reduce radiation doses. OBJECTIVES: This study aimed to evaluate, by a systematic review, the factors that influence the effective radiation dose associated with cone beam computed tomography and respective effects, and compared the effective dose of different cone beam computed tomography (CBCT) scanners with similar exposure parameters...
July 13, 2018: Clinical Oral Investigations
Arash Navran, Wilma Heemsbergen, Tomas Janssen, Olga Hamming-Vrieze, Marcel Jonker, Charlotte Zuur, Marcel Verheij, Peter Remeijer, Jan-Jakob Sonke, Michiel van den Brekel, Abrahim Al-Mamgani
BACKGROUND AND PURPOSE: In recent decades, outcomes of patients with head and neck cancer (HNC) have improved as a result of implementing several strategies, such as chemoradiation. However, these improvements were achieved at the cost of increased toxicity. One way to reduce radiation-related toxicity is by reducing the margins. MATERIALS AND METHODS: Between 2013 and 2016, 206 consecutive patients were treated with CTV-PTV margin of 5 mm and subsequently 208 patients with 3 mm margin...
July 10, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
Karine Sayure Okano, Lucia Helena Soares Cevidanes, Paula Loureiro Cheib, Antonio Carlos de Oliveira Ruellas, Marília Yatabe, Tung Nguyen, Lorenzo Franchi, James A McNamara, Bernardo Quiroga Souki
OBJECTIVES: The purpose of this three-dimensional (3D) study was to assess retrospectively the middle cranial fossa and central skull base of patients treated with the Herbst appliance (HA). MATERIALS AND METHODS: 3D surface virtual models of 40 Class II, division 1 malocclusion patients were generated from cone-beam computed tomography (CBCT) acquired before treatment (T0) and after 8 months of HA treatment (T1). T0 and T1 3D models were superimposed volumetrically at the anterior cranial fossa...
July 13, 2018: Angle Orthodontist
Priscila A Lopes, Gustavo M Santaella, Carlos Augusto S Lima, Karla de Faria Vasconcelos, Francisco C Groppo
OBJECTIVES: To evaluate different materials in simulating soft tissues and to analyze the influence of these materials on the mean (MPIV) and standard deviation (SDPIV) of pixel intensity values comparing them to a gold standard in CBCT images. METHODS: Images of three piglet heads with their soft tissues intact (gold standard) and different simulant materials were acquired: ice, modelling wax, and ballistic gelatin, with the same thickness of the original soft tissues...
July 13, 2018: Dento Maxillo Facial Radiology
Benjamin S Rosen, Peter G Hawkins, Daniel F Polan, James M Balter, Kristy K Brock, Justin D Kamp, Christina M Lockhart, Avraham Eisbruch, Michelle L Mierzwa, Randall K Ten Haken, Issam El Naqa
PURPOSE: To determine whether serial cone-beam computed tomography (CBCT) images taken during head and neck radiotherapy (HNR) can improve chronic xerostomia prediction METHODS AND MATERIALS: In a retrospective analysis, parotid glands (PGs) were delineated on daily kV CBCT images using deformable image registration (DIR) for 119 HNR patients (60 or 70 Gy in 2 Gy/fraction over 6 or 7 weeks). DIR accuracy for a subset of deformed contours was quantified using the Dice similarity coefficient (DSC) and mean distance-to-agreement (MDA) in comparison to manually drawn contours...
July 9, 2018: International Journal of Radiation Oncology, Biology, Physics
Dagmar Schnabl, Anna-Kathrin Rottler, Werner Schupp, Wolfgang Boisserée, Ingrid Grunert
Objectives: To compare cone beam computed tomography (CBCT) and magnetic resonance tomography (MRT) in patients with temporomandibular joint (TMJ) arthralgia in respect of the evaluation of bony structures, and to correlate joint space distances measured in CBCT with the morphology and the position of the disc visualized in MRT. Materials & methods: 26 temporomandibular joints (TMJs) in 13 patients clinically diagnosed with TMJ arthralgia were examined by both CBCT and MRT...
June 2018: Heliyon
Babak Rastegar, Brice Thumilaire, Guillaume A Odri, Sergio Siciliano, Jan Zapała, Pierre Mahy, Raphael Olszewski
BACKGROUND: Validation of three-dimensional (3D) reconstructions of full dental arches with crowns and roots based on cone beam computed tomography (CBCT) imaging represents a key issue in 3D digital dentistry. OBJECTIVES: The aim of the study was to search for the most accurate in vivo windowing-based manual tooth segmentation using CBCT. The null hypothesis was that all applied windowing protocols were equivalent in terms of in vivo tooth volume measurement using CBCT...
July 12, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
Yuru Pei, Yunai Yi, Gengyu Ma, Tae-Kyun Kim, Yuke Guo, Tianmin Xu, Hongbin Zha
Establishing dense correspondences of cone-beam computed tomography (CBCT) images is a crucial step for the attribute transfer and morphological variation assessment in clinical orthodontics. In this paper, a novel method, unsupervised spatially consistent clustering forest, is proposed to tackle the challenges for automatic supervoxel-wise correspondences of CBCT images. A complexity analysis of the proposed method w.r.t. the clustering hypotheses is provided with a data-dependent learning guarantee. The learning bound considers both the sequential tree traversals determined by questions stored in branch nodes and the clustering compactness of leaf nodes...
April 23, 2018: IEEE Transactions on Medical Imaging
Davi de Sá Cavalcante, Cristiane Sr Fonteles, Thyciana R Ribeiro, Lúcio M Kurita, Alynne Vde M Pimenta, Francisco Sr Carvalho, Fábio Wg Costa
Regional odontodysplasia (RO) is a rare nonhereditary developmental condition usually affecting maxilla and female patients. A few number of articles have used the cone beam computed tomography (CBCT) to describe imaging findings in RO. Thus, this article aims to report unusual imaging findings in a Brazilian child who presented with mandibular RO. A healthy 8-year-old boy was referred for evaluation of an anterior mandibular gingival enlargement. Radiographically, all right mandibular teeth showed wide pulp chambers and shortened roots with thin dentinal walls and open apices, featuring a "ghost teeth" appearance, which indicated a diagnosis of RO...
March 2018: International Journal of Clinical Pediatric Dentistry
Liping Zhan, Runtao Gao, Jiao Fan, Huarui Ma
OBJECTIVE: This study aims to evaluate the effect of dentoalveolar distraction extraction (DDE) on site preservation, and to evaluate how the technique keeps the height and width of alveolar bones to a greater extent. METHODS: 12 beagle dogs, randomly divided into three groups (DDE group, NH group, BOG group), were used. In the dogs of three groups, the distal root of the left or right third mandibular premolars were respectively extracted by three methods namely, DDE, traditional extraction with natural healing, and traditional extraction with Bio-Oss bone dust implanted and guided bone regeneration (GBR)...
June 29, 2018: Journal of X-ray Science and Technology
Yi-Han Li, Shi-Jie Bao, Xiang-Wen Yang, Xiao-Mei Tian, Bin Wei, Yuan-Li Zheng
OBJECTIVE: This study aimed to use cone-beam computed tomography (CBCT) to evaluate the root anatomy and canal morphology of maxillary premolars in a Chinese population and determine their degree of bilateral symmetry. DESIGN: 774 CBCT images were retrospectively analyzed, representing 1387 maxillary first premolars and 1403 second premolars. The number of roots and canals were recorded. The morphology of root canal systems was determined according to Vertucci's classification...
June 28, 2018: Archives of Oral Biology
Heeresh Shetty, Shishir Shetty, Adesh Kakade, Rajiv Desai, Cheng F Zhang, Prasanna Neelakantan
AIM: The aim of the present study was to investigate the tissue generated after regenerative endodontic procedure (REP) in the root canal space of an immature mandibular second premolar with pulp necrosis and chronic apical abscess using cone-beam computed tomographic (CBCT) and histological methods. METHODS: REP was performed in an immature mandibular second premolar. At the 3-year follow up, CBCT scans were taken to evaluate the outcome of treatment. As the tooth was not restorable to function, it was extracted and processed for histological examination...
July 9, 2018: Journal of Investigative and Clinical Dentistry
Deborah Queiroz Freitas, Taruska Ventorini Vasconcelos, Marcel Noujeim
OBJECTIVES: To evaluate the influence of artifacts produced by zirconium implant on the diagnosis of vertical root fracture (VRF) in teeth close and distant to the implant in cone beam computed tomography (CBCT) images. We also determined if kilovoltage (kVp) and metal artifact reduction (MAR) tool could influence this diagnosis. MATERIALS AND METHODS: Twenty single-root teeth were divided in control and fractured groups (n = 10). The teeth were randomly positioned in the first and second and right and left pre-molar alveoli of a dry human mandible...
July 8, 2018: Clinical Oral Investigations
Byung-Joon Choi, Byung-Soo Kim, Ji-Min Lim, Junho Jung, Jung-Woo Lee, Joo-Young Ohe
Background: We evaluated change in the mandibular condyle after orthognathic surgery using cone-beam computed tomography (CBCT) in patients with facial asymmetry. Methods: Thirty patients with skeletal class III malocclusion and mandibular prognathism or facial asymmetry were classified into two groups according to the amount of menton deviation (MD) from the facial midline on anteroposterior (AP) cephalogram: group A (asymmetry, MD ≥ 4 mm; n  = 15) and group B (symmetry, MD < 4 mm; n  = 15)...
December 2018: Maxillofacial Plastic and Reconstructive Surgery
David Asher, Kyle R Padgett, Ricardo E Llorente, Benjamin S Farnia, John C Ford, Shefali R Gajjar, Shahil Mehta, Garrett N Simpson, Nesrin Dogan, Lorraine Portelance
Radiation treatment verification has improved significantly over the past decades. The field has moved from film X-rays and skin marks to fiducial tracking and daily cone beam computed tomography (CBCT) for tumor localization. We now have the ability to perform daily on-board magnetic resonance imaging (MRI), which provides superior soft tissue contrast compared to computed tomography (CT). In the management of cervical cancer, the brachytherapy literature has demonstrated that MRI allows for better delineation of the high-risk clinical target volume (HR-CTV) and the use of MRI-guided brachytherapy has translated into improved treatment outcomes...
May 4, 2018: Curēus
Christian Doll, Nadine Thieme, Stefanie Schönmuth, Jan Oliver Voss, Susanne Nahles, Benedicta Beck-Broichsitter, Max Heiland, Jan-Dirk Raguse
PURPOSE: Despite the advantages and broad applications of alloplastic resorbable implants, postoperative radiological control is challenging due to its radiolucency. The aim of the present study was to evaluate the radiographic visibility of newly developed materials for orbital floor reconstruction. MATERIALS AND METHODS: The radiographic visibility of four different material combinations consisting of poly-(L-lactic acid)/poly-glycolic acid (PLLA/PGA) or poly(D,L-lactic acid) (PDLLA) enriched with magnesium (Mg), hydroxyapatite (HA) or β-tricalcium phosphate (β-TCP) with various layers of thicknesses (0...
May 31, 2018: Journal of Cranio-maxillo-facial Surgery
Seung Hyuck Jeon, Jin Ho Kim
PURPOSE: To investigate positional uncertainty and its correlation with clinical parameters in spine stereotactic body radiotherapy (SBRT) using thermoplastic mask (TM) immobilization. Materials and. METHODS: A total of 21 patients who underwent spine SBRT for cervical or upper thoracic spinal lesions were retrospectively analyzed. All patients were treated with image guidance using cone beam computed tomography (CBCT) and 4 degrees-of-freedom (DoF) positional correction...
June 2018: Radiation Oncology Journal
Andreas Kurrek, Angelo Troedhan, Marko Konschake
PURPOSE: An ongoing clinical trial regarding intra- and post-surgical morbidity in maxillary apicoectomies showed significant higher morbidity for upper canines and palatal roots of upper 1st premolars. Analysis of available presurgical cone beam computed tomography (CBCT)-scans revealed the existence of an unknown bone-canal branching off from the bone-canal or groove of the anterior superior alveolar artery (asaa). Aim of the study was the determination of the contents of this newly found bone canal in human cadaver heads, its prevalence as possible standard anatomical structure and its automatized detection with a contemporary high-resolution TRIUM-CBCT-device in vivo...
July 6, 2018: Surgical and Radiologic Anatomy: SRA
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