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https://www.readbyqxmd.com/read/28086998/evaluation-of-artifacts-generated-by-zirconium-implants-in-cone-beam-computed-tomography-images
#1
Taruska Ventorini Vasconcelos, Boulos B Bechara, Clyde Alex McMahan, Deborah Queiroz Freitas, Marcel Noujeim
OBJECTIVE: To evaluate zirconium implant artifact production in cone beam computed tomography images obtained with different protocols. STUDY DESIGN: One zirconium implant was inserted in an edentulous mandible. Twenty scans were acquired with a ProMax 3D unit (Planmeca Oy, Helsinki, Finland), with acquisition settings ranging from 70 to 90 peak kilovoltage (kVp) and voxel sizes of 0.32 and 0.16 mm. A metal artifact reduction (MAR) tool was activated in half of the scans...
February 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28071714/three-dimensional-surgical-simulation-improves-the-planning-for-correction-of-facial-prognathism-and-asymmetry-a-qualitative-and-quantitative-study
#2
Cheng-Ting Ho, Hsiu-Hsia Lin, Eric J W Liou, Lun-Jou Lo
Traditional planning method for orthognathic surgery has limitations of cephalometric analysis, especially for patients with asymmetry. The aim of this study was to assess surgical plan modification after 3-demensional (3D) simulation. The procedures were to perform traditional surgical planning, construction of 3D model for the initial surgical plan (P1), 3D model of altered surgical plan after simulation (P2), comparison between P1 and P2 models, surgical execution, and postoperative validation using superimposition and root-mean-square difference (RMSD) between postoperative 3D image and P2 simulation model...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28063377/finite-element-analysis-of-post-dental-implant-fixation-in-drilled-mandible-sites
#3
Adel Pirjamalineisiani, Mohsen Sarafbidabad, Nima Jamshidi, Fatemeh Abedi Esfahani
BACKGROUND: Implant loosening may occur after dental implant placement as a result of the mechanical conditions created around the implant. In this research, the effect of bone drilling conditions on the magnitude of stress created in newly-formed bone around the implant, after placement, was investigated using FEA analysis. METHOD: The simulations performed in this study were based on the three-dimensional (3D) shape of the created cavities, extracted from the drilled cortical bone of the jaws...
November 27, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28045346/utility-of-fusion-volumetric-images-from-computed-tomography-and-magnetic-resonance-imaging-for-localizing-the-mandibular-canal
#4
Chutamas Deepho, Hiroshi Watanabe, Shinya Kotaki, Junichiro Sakamoto, Yasunori Sumi, Tohru Kurabayashi
OBJECTIVES: The purpose of this study is to investigate whether computed tomography/magnetic resonance imaging (CT/MRI) fusion volumetric images can improve the detectability of the mandibular canal (MC) compared to CT alone. METHODS: Images of 31 lesions within or close to the mandible using both multi-slice CT (MSCT) and MRI were gathered from our imaging archives. All lesions underwent MSCT and three dimensional volumetric interpolated breath-hold examination (3D-VIBE) MRI...
January 3, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28039903/digital-vs-conventional-full-arch-implant-impressions-a-comparative-study
#5
Sarah Amin, Hans Peter Weber, Matthew Finkelman, Khaled El Rafie, Yukio Kudara, Panos Papaspyridakos
PURPOSE: To test whether or not digital full-arch implant impressions with two different intra-oral scanners (CEREC Omnicam and True Definition) have the same accuracy as conventional ones. The hypothesis was that the splinted open-tray impressions would be more accurate than digital full-arch impressions. MATERIAL AND METHODS: A stone master cast representing an edentulous mandible using five internal connection implant analogs (Straumann Bone Level RC, Basel, Switzerland) was fabricated...
December 31, 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28032053/impact-of-implant-diameter-and-length-on-stress-distribution-in-osseointegrated-implants-a-3d-fea-study
#6
R Eazhil, Siva Vadivel Swaminathan, Madhan Gunaseelan, G Vijay Kannan, Chandrapandian Alagesan
AIMS AND OBJECTIVES: Dimension of dental implant is an important parameter which has a considerable impact on the biomechanical load transfer characters and its prognosis. Excessive stress in the bone-implant interface may result in the failure of the implant. The aim of this study was to evaluate the impact of implant diameter and length on neighboring tissues around the implant. The results of the study will help in developing a scientific methodology to select appropriate implant diameter and length...
November 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28005765/functional-reconstruction-in-mandibular-avulsion-injuries
#7
Yoav Leiser, Dekel Shilo, Amir Wolff, Adi Rachmiel
The present report describes the planning and surgery as well as pitfalls and management of a patient with a near total mandibular avulsion injury that was rehabilitated using three-dimensional (3D) laser printing of a titanium lower jaw. Laser-sintering involves zapping layers of powdered metal to recreate a 3D implantable skeletal defect. The process involves using either mirror imaging of the unaffected side or using archival image database of healthy individuals. A 25-year-old man presented with a gunshot injury that left him with a near total avulsed mandible...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28005744/a-new-procedure-assisted-by-digital-techniques-for-secondary-mandibular-reconstruction-with-free-fibula-flap
#8
Yao Yu, Wen-Bo Zhang, Xiao-Jing Liu, Chuan-Bin Guo, Guang-Yan Yu, Xin Peng
PURPOSE: To describe a new procedure assisted by digital techniques for secondary mandibular reconstruction with free fibula flap. METHODS: The 3-dimensional (3D) reconstruction images for vessels were used to demonstrate the vascular diameter and location, which help select the most suitable vein and artery for anastomosis. Maxillary and mandibular stone models of the patient were fabricated and a stable occlusal relationship was determined on an articulator. The 3D tooth model data were scanned using a 3D-optical measuring system, and the obtained stereolithographic (STL) data were imported to Geomagic software...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27995122/three-dimensional-morphometric-analysis-of-mandibule-in-coronal-plane-after-bimaxillary-rotational-surgery
#9
Sung-Tak Lee, Na-Rae Choi, Jae-Min Song, Sang-Hun Shin
BACKGROUND: The aim of this report is to present a new reference for aesthetic mandible surgery using three-dimensional cone-beam computed tomography-based treatment planning for orthognathic surgery which can be implemented in surgical planning and perioperative procedure. METHODS: To make an objective standard for evaluating aesthetic mandibular outline, we make an aesthetic scoring criteria with consideration of asymmetry, broad mandibular border line, and prominent mandibular angle...
December 2016: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27990508/quantification-of-bone-quality-using-different-cone-beam-computed-tomography-devices-accuracy-assessment-for-edentulous-human-mandibles
#10
Jeroen Van Dessel, Laura Ferreira Pinheiro Nicolielo, Yan Huang, Pieter Slagmolen, Constantinus Politis, Ivo Lambrichts, Reinhilde Jacobs
PURPOSE: To determine the accuracy of the latest cone beam computed tomography (CBCT) machines in comparison to multi-slice computer tomography (MSCT) and micro computed tomography (micro-CT) for objectively assessing trabecular and cortical bone quality prior to implant placement. MATERIALS AND METHODS: Eight edentulous human mandibular bone samples were scanned with seven CBCT scanners (3D Accuitomo 170, i-CAT Next Generation, ProMax 3D Max, Scanora 3D, Cranex 3D, Newtom GiANO and Carestream 9300) and one MSCT system (Somatom Definition Flash) using the clinical exposure protocol with the highest resolution...
2016: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/27966601/development-of-a-computer-aided-design-software-for-dental-splint-in-orthognathic-surgery
#11
Xiaojun Chen, Xing Li, Lu Xu, Yi Sun, Constantinus Politis, Jan Egger
In the orthognathic surgery, dental splints are important and necessary to help the surgeon reposition the maxilla or mandible. However, the traditional methods of manual design of dental splints are difficult and time-consuming. The research on computer-aided design software for dental splints is rarely reported. Our purpose is to develop a novel special software named EasySplint to design the dental splints conveniently and efficiently. The design can be divided into two steps, which are the generation of initial splint base and the Boolean operation between it and the maxilla-mandibular model...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27940411/can-mastication-in-children-with-cerebral-palsy-be-analyzed-by-clinical-observation-dynamic-ultrasound-and-3d-kinematics
#12
L Remijn, B E Groen, R Speyer, J van Limbeek, J A Vermaire, L van den Engel-Hoek, M W G Nijhuis-van der Sanden
The aim of this study was to explore the feasibility of the Mastication Observation and Evaluation (MOE) instrument, dynamic ultrasound and 3D kinematic measurements to describe mastication in children with spastic cerebral palsy and typically developing children. Masticatory movements during five trials of eating a biscuit were assessed in 8 children with cerebral palsy, spastic type (mean age 9.08years) and 14 typically developing children (mean age 9.01years). Differences between trials were tested (t-test) and the mastication of individual children with cerebral palsy was analyzed...
November 29, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27939907/effect-of-interfragmentary-gap-on-the-mechanical-behavior-of-mandibular-angle-fracture-with-three-fixation-designs-a-finite-element-analysis
#13
Russell Wang, Yunfeng Liu, Joanne Helen Wang, Dale Allen Baur
BACKGROUND: The aim of this study was to simulate stress and strain distribution numerically on a normal mandible under physiological occlusal loadings. The results were compared with those of mandibles that had an angle fracture stabilized with different fixation designs under the same loadings. The amount of displacement at two interfragmentary gaps was also studied. MATERIALS AND METHODS: A three-dimensional (3D) virtual mandible was reconstructed with an angle fracture that had a fracture gap of either 0...
November 11, 2016: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/27939734/external-cervical-resorption-a-comparison-of-the-diagnostic-efficacy-using-2-different-cone-beam-computed-tomographic-units-and-periapical-radiographs
#14
Daniel Vaz de Souza, Elia Schirru, Francesco Mannocci, Federico Foschi, Shanon Patel
INTRODUCTION: The aim of this study was to compare the diagnostic efficacy of 2 cone-beam computed tomographic (CBCT) units with parallax periapical (PA) radiographs for the detection and classification of simulated external cervical resorption (ECR) lesions. METHODS: Simulated ECR lesions were created on 13 mandibular teeth from 3 human dry mandibles. PA and CBCT scans were taken using 2 different units, Kodak CS9300 (Carestream Health Inc, Rochester, NY) and Morita 3D Accuitomo 80 (J Morita, Kyoto, Japan), before and after the creation of the ECR lesions...
January 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/27921118/can-different-occlusal-positions-instantaneously-impact-spine-and-body-posture-a-pilot-study-using-rasterstereography-for-a-three-dimensional-evaluation
#15
Karoline März, Werner Adler, Ragai-Edward Matta, Linda Wolf, Manfred Wichmann, Bastian Bergauer
PURPOSE: Orthodontists influence dental occlusion directly. To suggest any link between dental occlusion and body posture is highly contentious, as evidenced by the literature. Rasterstereography, an optical technique that enables three-dimensional (3D) body measurements to be collected, has not yet been used to impartially examine whether different occlusal positions could instantaneously alter spine and body posture. We therefore set out to use this technique to nonsubjectively evaluate this question under static conditions...
December 5, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27896211/comparison-of-postoperative-changes-in-the-distal-and-proximal-segments-between-conventional-and-sliding-mini-plate-fixation-following-mandibular-setback
#16
Seong-Sik Kim, Kyoung-Ho Kwak, Ching-Chang Ko, Soo-Byung Park, Woo-Sung Son, Yong-Il Kim
OBJECTIVE: The purpose of the present study was to evaluate the postoperative three-dimensional (3D) changes in the proximal segments after mandibular setback sagittal split ramus osteotomy and to compare the changes between the conventional mini-plate fixation and semi-rigid sliding plate fixation. METHODS: Cone-beam computed tomography (CBCT) images were used to evaluate the postoperative 3D changes in the proximal segments during the healing process. CBCT images were superimposed using the symphysis and the lower anterior mandible as references...
November 2016: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/27878463/tracking-of-the-inferior-alveolar-nerve-its-implication-in-surgical-planning
#17
Jimoh O Agbaje, Elke Van de Casteele, Ahmed S Salem, Dickson Anumendem, Ivo Lambrichts, Constantinus Politis
OBJECTIVES: The objective of the study is to assess the correlation between the mandibular canal tracing done on cone beam CT (CBCT) data, with the size, shape, and position of the neurovascular bundle (NB) obtained by magnetic resonance imaging (MRI). MATERIAL AND METHODS: Six human cadaver mandibles were scanned with a CBCT Promax® scanner (Planmeca, Helsinki, Finland) and with an Ingenia® 3.0 T MR system (Philips, Amsterdam, The Netherlands). The NB was segmented from the MRI dataset, while the mandibular canal (MC) tracing was done on the CBCT images...
November 22, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27853498/dosimetry-of-three-cone-beam-computerized-tomography-scanners-at-different-fields-of-view-in-terms-of-various-head-and-neck-organs
#18
Sima Nikneshan, Mahmood Reza Aghamiri, Ehsan Moudi, Nika Bahemmat, Hoora Hadian
BACKGROUND: Marketing new radiography devices necessitates documenting their absorbed X-ray doses. Since the current literature lacks studies on new devices, we assessed the doses of two new devices that had not previously been assessed. OBJECTIVES: The new devices were compared to the Promax three dimensional (3D) scanner at two fields of view (FOV) in nine critical head and neck tissues and organs. MATERIALS AND METHODS: Seventeen thermoluminescence dosimeters positioned in an average-sized male RANDO phantom were used to determine the dosimetry of the three cone beam computerized tomography devices (NewTom VGi, NewTom 5G, and Promax 3D) at two field of views (FOVs), one small and one large...
July 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27833286/diagnostic-tools-in-maxillofacial-fractures-is-there-really-a-need-of-three-dimensional-computed-tomography
#19
Sheerin Shah, Sanjeev K Uppal, Rajinder K Mittal, Ramneesh Garg, Kavita Saggar, Rishi Dhawan
INTRODUCTION: Because of its functional and cosmetic importance, facial injuries, especially bony fractures are clinically very significant. Missed and maltreated fractures might result in malocclusion and disfigurement of the face, thus making accurate diagnosis of the fracture very essential. In earlier times, conventional radiography along with clinical examination played a major role in diagnosis of maxillofacial fractures. However, it was noted that the overlapping nature of bones and the inability to visualise soft tissue swelling and fracture displacement, especially in face, makes radiography less reliable and useful...
May 2016: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/27815013/mandibular-reconstruction-after-cancer-an-in-house-approach-to-manufacturing-cutting-guides
#20
R Bosc, B Hersant, R Carloni, J Niddam, J Bouhassira, H De Kermadec, E Bequignon, T Wojcik, M Julieron, J-P Meningaud
The restoration of mandibular bone defects after cancer can be facilitated by computer-assisted preoperative planning. The aim of this study was to assess an in-house manufacturing approach to customized cutting guides for use in the reconstruction of the mandible with osteocutaneous free flaps. A retrospective cohort study was performed, involving 18 patients who underwent mandibular reconstruction with a fibula free flap at three institutions during the period July 2012 to March 2015. A single surgeon designed and manufactured fibula and mandible cutting guides using a computer-aided design process and three-dimensional (3D) printing technology...
January 2017: International Journal of Oral and Maxillofacial Surgery
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