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https://www.readbyqxmd.com/read/29032819/assessment-of-the-second-mesiobuccal-root-canal-in-maxillary-first-molars-a-cone-beam-computed-tomographic-study
#1
Yuerong Zhang, Hai Xu, Dongmiao Wang, Yongchun Gu, Juan Wang, Shuzhen Tu, Xiaohui Qiu, Fuyu Zhang, Yao Luo, Shi Xu, Jianling Bai, Grandini Simone, Guangdong Zhang
INTRODUCTION: The purpose of this study was to investigate the incidence and location of the second mesiobuccal (MB2) root canal of the maxillary first molar and the relationship between the presence of an MB2 canal and the distribution of canal orifices on the pulpal floor with the aid of cone-beam computed tomographic (CBCT) technology. METHODS: A total of 1008 maxillary first molars (548 patients) were randomly selected and analyzed through CBCT imaging. The association between the incidence of MB2 canals and potential impacting factors including sex, side, age, and the distribution of the main root canal orifices on the pulpal floor was explored...
October 9, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28809631/-comparison-between-the-range-of-movement-canine-real-cervical-spine-and-numerical-simulation-computer-model-validation
#2
R Srnec, Z Horák, R Sedláček, M Sedlinská, M Krbec, A Nečas
PURPOSE OF THE STUDY In developing new or modifying the existing surgical treatment methods of spine conditions an integral part of ex vivo experiments is the assessment of mechanical, kinematic and dynamic properties of created constructions. The aim of the study is to create an appropriately validated numerical model of canine cervical spine in order to obtain a tool for basic research to be applied in cervical spine surgeries. For this purpose, canine is a suitable model due to the occurrence of similar cervical spine conditions in some breeds of dogs and in humans...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28749837/occlusion-guided-double-barreled-fibular-osteoseptocutaneous-free-flap-for-refined-mandibular-reconstruction-aided-by-virtual-surgical-planning
#3
Xingzhou Qu, Mingyi Wang, Liqun Xu, Jiannan Liu, Shizhu Bai, Chenping Zhang
BACKGROUND: There were many articles about double-barreled fibular flap for mandibular reconstruction. The upper layer bone was suit for implant placement as a new alveolar. The lower layer was necessary for contour. But the accurate relationship between the 2 layers bone was rarely reported. OBJECTIVES: The purpose of this study was twofold: to evaluate the feasibility of the novel design of the double-barreled fibular flap from virtual surgery to actual result; to evaluate the accuracy and results of occlusion-guided double-barreled fibular free flap in mandible reconstruction...
September 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28746083/novel-cardiac-coordinate-modeling-system-for-three-dimensional-quantification-of-inflow-cannula-malposition-of-heartmate-ii-lvads
#4
Brian Lima, Onur Dur, Joyce Chuang, Themistokles Chamogeorgakis, David J Farrar, Kartik S Sundareswaran, Joost Felius, Susan M Joseph, Shelley A Hall, Gonzalo V Gonzalez-Stawinski
Optimal function of left ventricular assist devices (LVADs) depends on proper alignment of the inflow cannula (IC). Quantitative guidelines for IC angulation are lacking because of variation in cardiac geometry and difficulty in analyzing three-dimensional (3D) cannula orientation relative to the left ventricle (LV). Based on contrast-enhanced computed tomography images from five normal and five clinically malpositioned IC cases in patients with HeartMate II LVADs, we developed a method for 3D quantification of IC malpositioning...
July 25, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28735790/patient-specific-finite-element-analysis-of-fiber-post-and-ferrule-design
#5
Monise de Paula Rodrigues, Priscilla Barbosa Ferreira Soares, Andréa Dollores Correia Miranda Valdivia, Roberto Sales Pessoa, Crisnicaw Veríssimo, Antheunis Versluis, Carlos José Soares
INTRODUCTION: A ferrule on anterior endodontic-treated teeth has been evaluated using clinical trials, in vitro tests, and finite element analysis (FEA). The patient-specific FEA with a nonuniform ferrule and nonlinear contact biting load associated with clinical validation can be used to predict failure. METHODS: A patient was selected with both maxillary central incisors with different ferrule designs who received endodontic treatment and restoration using a fiber post, composite core, and computer aided design and computer aided manufacturing lithium disilicate ceramic crowns...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28689393/inter-and-intra-observer-variability-of-the-volume-of-cervical-ossification-of-the-posterior-longitudinal-ligament-using-medical-image-processing-software
#6
Dong Ah Shin, Gyu Yeul Ji, Chang Hyun Oh, Keung Nyun Kim, Do Heum Yoon, Hyunchul Shin
OBJECTIVE: Computed tomography (CT)-based method of three dimensional (3D) analysis (MIMICS(®), Materialise, Leuven, Belgium) is reported as very useful software for evaluation of OPLL, but its reliability and reproducibility are obscure. This study was conducted to evaluate the accuracy of MIMICS(®) system, and inter- and intra-observer reliability in the measurement of OPLL. METHODS: Three neurosurgeons independently analyzed the randomly selected 10 OPLL cases with medical image processing software (MIMICS(®)) which create 3D model with Digital Imaging and Communication in Medicine (DICOM) data from CT images after brief explanation was given to examiners before the image construction steps...
July 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28680848/comparison-of-2-root-surface-area-measurement-methods-3-dimensional-laser-scanning-and-cone-beam-computed-tomography
#7
Jintana Tasanapanont, Janya Apisariyakul, Tanapan Wattanachai, Patiyut Sriwilas, Marit Midtbø, Dhirawat Jotikasthira
PURPOSE: The aim of this study was to compare the use of 3-dimensional (3D) laser scanning and cone-beam computed tomography (CBCT) as methods of root surface measurement. MATERIALS AND METHODS: Thirty teeth (15 maxillary first premolars and 15 mandibular first premolars) from 8 patients who required extractions for orthodontic treatment were selected. Before extraction, pre-treatment CBCT images of all the patients were recorded. First, a CBCT image was imported into simulation software (Mimics version 15...
June 2017: Imaging Science in Dentistry
https://www.readbyqxmd.com/read/28680711/three-dimensional-measurement-of-periodontal-surface-area-for-quantifying-inflammatory-burden
#8
Sa-Beom Park, So-Youn An, Won-Jeong Han, Jong-Tae Park
PURPOSE: Measurement of the root surface area (RSA) is important in periodontal treatment and for the evaluation of periodontal disease as a risk factor for systemic disease. The aim of this study was to measure the RSA at 6 mm below the cementoenamel junction (CEJ) using the Mimics software (Materialise, Leuven, Belgium). METHODS: We obtained cone-beam computed tomography (CBCT) data from 33 patients who had visited the Department of Oral and Maxillofacial Radiology of Dankook University Dental Hospital...
June 2017: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/28338309/impact-of-personalized-three-dimensional-3d-printed-pelvicalyceal-system-models-on-patient-information-in-percutaneous-nephrolithotripsy-surgery-a-pilot-study
#9
Hasan Anil Atalay, H Lütfi Canat, Volkan Ülker, İlter Alkan, Ünsal Özkuvanci, Fatih Altunrende
OBJECTIVE: To investigate the impact of personalized three dimensional (3D) printed pelvicalyceal system models on patient information before percutaneous nephrolithotripsy surgery. MATERIAL AND METHODS: Patients with unilateral complex renal stones with indicatation of percutaneous nephrolithotripsy surgery were selected. Usable data of patients were obtained from CT scans as Digital Imaging and Communications in Medicine (DICOM) format. Mimics software version 16...
May 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28245958/use-of-maxillofacial-laboratory-materials-to-construct-a-tissue-equivalent-head-phantom-with-removable-titanium-implantable-devices-for-use-in-verification-of-the-dose-of-intensity-modulated-radiotherapy
#10
K Morris
The dose of radiotherapy is often verified by measuring the dose of radiation at specific points within a phantom. The presence of high-density implant materials such as titanium, however, may cause complications both during calculation and delivery of the dose. Numerous studies have reported photon/electron backscatter and alteration of the dose by high-density implants, but we know of no evidence of a dosimetry phantom that incorporates high density implants or fixtures. The aim of the study was to design and manufacture a tissue-equivalent head phantom for use in verification of the dose in radiotherapy using a combination of traditional laboratory materials and techniques and 3-dimensional technology that can incorporate titanium maxillofacial devices...
February 25, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28224379/nerves-of-steel-a-low-cost-method-for-3d-printing-the-cranial-nerves
#11
Ramin Javan, Duncan Davidson, Afshin Javan
Steady-state free precession (SSFP) magnetic resonance imaging (MRI) can demonstrate details down to the cranial nerve (CN) level. High-resolution three-dimensional (3D) visualization can now quickly be performed at the workstation. However, we are still limited by visualization on flat screens. The emerging technologies in rapid prototyping or 3D printing overcome this limitation. It comprises a variety of automated manufacturing techniques, which use virtual 3D data sets to fabricate solid forms in a layer-by-layer technique...
February 21, 2017: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/28168060/3d-printing-aids-acetabular-reconstruction-in-complex-revision-hip-arthroplasty
#12
Andrew J Hughes, Cathal DeBuitleir, Philip Soden, Brian O'Donnchadha, Anthony Tansey, Ali Abdulkarim, Colm McMahon, Conor J Hurson
Revision hip arthroplasty requires comprehensive appreciation of abnormal bony anatomy. Advances in radiology and manufacturing technology have made three-dimensional (3D) representation of osseous anatomy obtainable, which provide visual and tactile feedback. Such life-size 3D models were manufactured from computed tomography scans of three hip joints in two patients. The first patient had undergone multiple previous hip arthroplasties for bilateral hip infections, resulting in right-sided pelvic discontinuity and a severe left-sided posterosuperior acetabular deficiency...
2017: Advances in Orthopedics
https://www.readbyqxmd.com/read/28108576/dual-source-computed-tomography-based-analysis-of-stent-performance-its-association-with-valvular-calcification-and-residual-aortic-regurgitation-after-implantation-of-a-balloon-expandable-transcatheter-heart-valve
#13
Julius Gerstmeyer, Maximilian Kütting, Buntaro Fujita, Annika Schuhbäck, Martin Arnold, Jochen Börgermann, Stephan Achenbach, Ulrich Steinseifer, Jan Gummert, Stephan Ensminger
Objectives: The aim of this study was to investigate the mutual influence of valvular calcifications and transcatheter aortic valve stent geometry during and after implantation of a balloon-expandable SAPIEN ® /SAPIEN XT ® prostheses. Aortic valve calcification has been linked with adverse complications after transcatheter aortic valve implantation (TAVI). However, little is known about the fate of the calcifications after TAVI as well as its influence on transcatheter heart valve geometry...
April 1, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28034635/patient-specific-bone-mineral-density-distribution-in-the-tibia-of-individuals-with-chronic-spinal-cord-injury-derived-from-multi-slice-peripheral-quantitative-computed-tomography-pqct-a-cross-sectional-study
#14
Sylvie Coupaud, Magnus K Gislason, Mariel Purcell, Keisuke Sasagawa, K Elizabeth Tanner
BACKGROUND: The high risk of fracture associated with chronic spinal cord injury (SCI) is attributed to extensive disuse-related bone loss in previously weight-bearing long bones. Changes in bone mineral density (BMD) after SCI have been documented extensively for the epiphyses of the tibia and femur, fracture-prone sites in this patient group. Less attention has been given to patterns of cortical bone loss in the diaphyses, but variability in BMD distributions throughout the long bones may contribute to some patients' increased susceptibility to shaft fractures in chronic SCI...
December 26, 2016: Bone
https://www.readbyqxmd.com/read/28018068/customized-iliac-prosthesis-for-reconstruction-in-giant-cell-tumour-a-unique-treatment-approach
#15
Tarun Verma, Ankur Sharma, Amit Sharma, Lalit Maini
Giant cell tumour (GCT) of flat bones of pelvis is extremely rare. GCT of the ilium and ischium represent less than 0.05% of all GCT. Iliac bone GCT has been treated traditionally by intra-lesion curettage with bone grafting, wide resection with or without reconstruction and hemi-pelvectomy in very aggressive tumours. None of the above treatments were without morbidities. Reconstruction using bone grafts and bone cement has also been inadequate. In GCT, where life expectancy is not decreased significantly, surgical treatment should be aimed at giving optimum functional outcome...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/27977586/application-of-a-3-dimensional-printed-navigation-template-in-bernese-periacetabular-osteotomies-a-cadaveric-study
#16
You Zhou, Xiaopeng Kang, Chuan Li, Xiaoshan Xu, Rong Li, Jun Wang, Wei Li, Haotian Luo, Sheng Lu
The aim of the present study was to describe the application of 3D printed templates for intraoperative navigation and simulation of periacetabular osteotomies (PAOs) in a cadaveric model.Five cadaveric specimens (10 sides) underwent thin-slice computed tomographic scans of the ala of ilium downwards to the proximal end of femoral shaft. Bernese PAO was performed. Using Mimics v10.1 software (Materialise, Leuven, Belgium), 3D computed tomographic reconstructions were created and the 4 standard PAO bone cuts-ischial, pubic, anterior, and posterior aspects of the ilium-as well as rotation of the dislocated acetabular bone blocks were simulated for each specimen...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27822004/the-morphometric-anatomy-of-the-delto-fulcral-triangle-a-3d-ct-based-reconstruction-study
#17
N Naidoo, L Lazarus, K S Satyapal, L De Wilde, A Van Tongel
This study introduced the new delto-fulcral triangle (DFT), the first anatomical model of its kind. As seen from the orthopaedician's supraspinatus-outlet view, the antero-superior point of the coracoid process along with the lateral- and posterior-most acromial landmarks form the boundaries of the DFT. Since these osseous scapular landmarks accounted for both dynamic and static stabilisers of the glenohumeral joint, knowledge of the anatomical features of the DFT may prove beneficial to the orthopaedic surgeon...
March 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/27718360/does-mandibular-distraction-vector-influence-airway-volumes-and-outcome
#18
MULTICENTER STUDY
Elizabeth G Zellner, Julie M Mhlaba, Russell R Reid, Derek M Steinbacher
PURPOSE: The goal of mandibular distraction in the Pierre-Robin sequence is to maximally expand the oropharyngeal airway. It has been hypothesized that a steep oblique distraction vector might allow greater airway enlargement compared with horizontal distraction. This study compared vector orientation in relation to airway volume and overall clinical outcome. MATERIALS AND METHODS: Micrognathic infants who underwent mandibular distraction with sufficient computed tomographic data were retrospectively reviewed...
January 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27563623/crouzon-syndrome-virtual-planning-of-surgical-treatment-by-application-of-internal-distractors
#19
Chingiz Rahimov, Ruslan Asadov, Gunel Hajiyeva, Nazim Verdiyev, Zaur Novruzov, Ismayil Farzaliyev
Crouzon syndrome is one of the frequent pathologies within craniosynostosis syndrome. Current progress in computers and biotechnologies allows improving surgical approach and forecasting final result of reconstruction as well. We present a case of successful surgical treatment of Crouzon syndrome, done by application of virtual planning allowing determining "monobloc" features, type of reconstruction and distraction protocol as well. A 20-year-old female had presented with craniofacial deformity. Clinical and radiological investigation revealed Crouzon syndrome...
January 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/27506462/impact-of-three-dimensional-printed-pelvicaliceal-system-models-on-residents-understanding-of-pelvicaliceal-system-anatomy-before-percutaneous-nephrolithotripsy-surgery-a-pilot-study
#20
Hasan Anıl Atalay, Volkan Ülker, İlter Alkan, Halil Lütfi Canat, Ünsal Özkuvancı, Fatih Altunrende
OBJECTIVE: To investigate the impact of three-dimensional (3D) printed pelvicaliceal system models on residents' understanding of pelvicaliceal system anatomy before percutaneous nephrolithotripsy (PCNL). MATERIALS AND METHODS: Patients with unilateral complex renal stones indicating PCNL were selected. Usable data of patients were obtained from CT-scans in Digital Imaging and Communications in Medicine (DICOM) format. Mimics software version 16.0 (Materialise, Belgium) was used for segmentation and extraction of pelvicaliceal systems (PCSs)...
October 2016: Journal of Endourology
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