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orbital reconstruction

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https://www.readbyqxmd.com/read/29140386/retrospective-study-of-survival-of-extraoral-endosseous-craniofacial-implants-in-head-and-neck-surgery-patients
#1
Brent J Woods, Arun Chandu
PURPOSE: To determine the survival rate of implants placed in different craniofacial locations and factors affecting survival. MATERIALS AND METHODS: This study retrospectively reviewed a consecutive series of patients treated at the Royal Melbourne Hospital who received craniofacial implants for an array of benign and malignant conditions. Implant survival per site and cumulative survival were determined. Surgical and implant variables were assessed using the Kaplan-Meier and Cox Proportional Hazards Models...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29135804/surgical-management-of-tumors-involving-meckel-s-cave-and-cavernous-sinus-role-of-an-extended-middle-fossa-and-lateral-sphenoidectomy-approach
#2
Daniel Q Sun, Arnold H Menezes, Matthew A Howard, Bruce J Gantz, David M Hasan, Marlan R Hansen
OBJECTIVE: To study the indications and outcomes of lateral sphenoidectomy as part of a combined skull base approach in the treatment of tumors involving Meckel's cave (MC) and cavernous sinus (CS). STUDY DESIGN: Retrospective patient series. SETTING: Tertiary referral center. PATIENTS: Twenty-two consecutive patients (mean age: 45 yr, range: 16-76) who underwent transzygomatic, extended middle fossa approaches for tumors involving MC and CS...
November 13, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29134065/a-bird-like-skull-in-a-triassic-diapsid-reptile-increases-heterogeneity-of-the-morphological-and-phylogenetic-radiation-of-diapsida
#3
Adam C Pritchard, Sterling J Nesbitt
The Triassic Period saw the first appearance of numerous amniote lineages (e.g. Lepidosauria, Archosauria, Mammalia) that defined Mesozoic ecosystems following the end Permian Mass Extinction, as well as the first major morphological diversification of crown-group reptiles. Unfortunately, much of our understanding of this event comes from the record of large-bodied reptiles (total body length > 1 m). Here we present a new species of drepanosaurid (small-bodied, chameleon-like diapsids) from the Upper Triassic Chinle Formation of New Mexico...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29124002/three-dimensional-reconstruction-of-late-post-traumatic-orbital-wall-defects-by-customized-implants-using-cad-cam-3d-stereolithographic-models-a-case-report
#4
Vignesh U, Divya Mehrotra, Dichen, Vaibhav Anand, Debraj Howlader
Aim: Purpose of this case report is to highlight the precision and accuracy obtained with patient specific implants for orbital reconstruction designed on the basis of volumetric analysis of orbital computed tomographic scan (CT) scans using virtual planning, computerised designing and manufacturing and stereolithographic models to correct late post-traumatic orbital deformities such as enophthalmos and diplopia. Material and methods: This case report describes a patient who visited our outpatient clinic for correction of enophthalmos and persistent diplopia in upward gaze, seven months post trauma...
September 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/29121707/reconstruction-of-medial-orbital-wall-fractures-without-subperiosteal-dissection-the-push-out-technique
#5
Yong-Ha Kim, Jin Ho Lee, Youngsoo Park, Sung-Eun Kim, Kyu-Jin Chung, Jun-Ho Lee, Tae Gon Kim
Background: Various surgical methods for repairing medial orbital wall fractures have been introduced. The conventional technique requires total separation of the displaced orbital bones from the orbital soft tissues. However, subperiosteal dissection around the fracture can cause additional damage. The aim of the present study is to introduce a method of reconstructing medial orbital wall fractures without subperiosteal dissection named the "push-out" technique. Methods: Six patients with post-traumatic enophthalmos resulting from an old medial orbital wall fracture and 10 patients with an acute medial orbital wall fracture were included...
November 10, 2017: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/29121409/image-quality-and-dose-for-a-multi-source-cone-beam-ct-extremity-scanner
#6
Grace Jianan Gang, Wojciech Zbijewski, Mahadevappa Mahesh, Gaurav Thawait, Nathan Packard, John Yorkston, Shadpour Demehri, Jeffrey Harrold Siewerdsen
PURPOSE: This work investigates the dose characteristics and image quality of a multi-source cone-beam CT scanner dedicated for extremity imaging. METHODS: The scanner has an x-ray source with three separate anode-cathode units evenly distributed along the longitudinal direction. A nominal scan protocol fires the three sources sequentially, and a total of 600 projections (200 for each source) are acquired over a source-detector orbit of 210(o) . Dose was measured using a Farmer chamber in three CTDI phantoms stacked end-to-end...
November 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/29101399/enhanced-arctic-amplification-began-at-the-mid-brunhes-event-400-000-years-ago
#7
T M Cronin, G S Dwyer, E K Caverly, J Farmer, L H DeNinno, J Rodriguez-Lazaro, L Gemery
Arctic Ocean temperatures influence ecosystems, sea ice, species diversity, biogeochemical cycling, seafloor methane stability, deep-sea circulation, and CO2 cycling. Today's Arctic Ocean and surrounding regions are undergoing climatic changes often attributed to "Arctic amplification" - that is, amplified warming in Arctic regions due to sea-ice loss and other processes, relative to global mean temperature. However, the long-term evolution of Arctic amplification is poorly constrained due to lack of continuous sediment proxy records of Arctic Ocean temperature, sea ice cover and circulation...
November 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29100830/should-virtual-mirroring-be-used-in-the-preoperative-planning-of-an-orbital-reconstruction
#8
Jesper Jansen, Leander Dubois, Ruud Schreurs, Peter J J Gooris, Thomas J J Maal, Ludo F Beenen, Alfred G Becking
PURPOSE: Mirroring has been used as a diagnostic tool in orbital wall fractures for many years, but limited research is available proving the assumed symmetry of orbits. The purpose of this study was to evaluate volume and contour differences between orbital cavities in healthy humans. MATERIALS AND METHODS: In this cross-sectional study, the left and right orbital cavities of a consecutive sample of patients' computed tomograms were measured. Inclusion criteria were patients with no sign of orbital or sinus pathology or fracture...
October 9, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29097021/zygomatico-orbital-artery-the-largest-artery-in-the-temporal-area
#9
Dong Hun Choi, Jeung Ryeol Eom, Jeong Woo Lee, Jung Dug Yang, Ho Yun Chung, Byung Chae Cho, Kang Young Choi
The zygomatico-orbital artery is the largest artery in the temporal area. With the increasing number of reconstructive and aesthetic surgeries in the area, in-depth understanding of this artery is needed. Thus, the aim of this anatomical study was to determine more information on the zygomatico-orbital artery using contrast-enhanced three-dimensional computer tomography (CT) and color-flow Doppler sonography. On the basis of CT images taken between October 2015 and October 2016 for diagnosing and treating maxillofacial conditions, 50 patients were selected...
October 16, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/29090202/reconstruction-of-large-orbital-floor-defect-caused-by-maxillary-sinus-mucocele
#10
Seung Bum Pyo, Jin Kyung Song, Hong Sil Ju, Seong Yoon Lim
Maxillary sinus mucocele can occur due to many medical factors such as chronic infection, allergic sinonasal disease, trauma, and previous surgery. However, it occurs mainly after Caldwell-Luc operation, usually more than 10 years after surgery. There are a few cases of maxillary sinus mucocele with ocular symptoms. Also, a case causing ocular symptoms because of invasion to the orbital floor is rare. Therefore, we report a case of a 55-year-old male patient who underwent Caldwell-Luc operation about 30 years ago...
September 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/29072661/-the-application-of-the-computer-technologies-for-the-mathematical-simulation-of-the-ethmoidal-labyrinth
#11
M V Markeeva, O V Mareev, V N Nikolenko, G O Mareev, T V Danilova, E A Fadeeva, R V Fedorov
The objective of the present work was to study the relationship between the dimensions of the ethmoidal labyrinth and the skull in the subjects differing in the nose shape by means of the factorial and correlation analysis with the application of the modern computer-assisted methods for the three-dimensional reconstruction of the skull. We developed an original method for computed craniometry with the use the original program that made it possible to determine the standard intravital craniometrics characteristics of the human skull with a high degree of accuracy based on the results of analysis of 200 computed tomograms of the head...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/29070473/-surgical-correction-of-conjunctival-sac-narrowing-after-orbital-implantation-using-polyester-fiber-heart-patches
#12
Bing-Song Dong, Cui-Hua Xie, Lin-Jiang Chen, Ke Xiong, Juan Yang
OBJECTIVE: To test the feasibility of correcting conjunctival sac narrowing following orbital implantation using polyester fiber heart patches instead of the skin autograft. METHODS: Twelve patients of conjunctival sac narrowing after orbital implantation (including 3 with orbital implant exposure) admitted in Nanfang Hospital between 2012 and 2016 received surgical correction of the conjunctival sac using polyester fiber heart patches. During the surgery, the central conjunctival sac was opened, the exposed area was covered with suitable polyester fiber heart patches, and the palpebral margin was sutured...
October 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/29068964/an-algorithm-for-managing-intraosseous-vascular-anomalies-of-the-craniofacial-skeleton
#13
Kathryn V Isaac, Tara Lynn Teshima, Richard I Aviv, Mahmood Fazl, Leodante da Costa, Todd Mainprize, Oleh Antonyshyn
BACKGROUND: Intraosseous vascular anomalies (IOVA) are rare in the craniofacial skeleton and present a diagnostic and therapeutic challenge. This study aims to describe the clinical management based on a large case series. METHODS: A retrospective chart review was performed and 9 IOVA were identified over a 15-year period. Data on demographics, diagnostic features, clinical management, and outcomes were reviewed. RESULTS: Five frontal bone IOVA and 4 orbital IOVA were identified...
October 24, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29067373/adsorption-and-dissociation-of-o2-on-moo2-1-combining-macron-11-surfaces-a-dft-study
#14
Quan Zhang, Minhua Zhang, Tomasz Wiltowski
The adsorption and dissociation of O2 on MoO2(1[combining macron]11) surfaces were studied by density functional theory (DFT). The results show that O2 molecules prefer to be adsorbed on the five-coordinated Mo top sites. Density of states analysis shows strong hybridization of Mo 4d orbitals and O 2p orbitals in the Mo-O bond. Clean MoO2 slabs and slabs with O2 adsorption are metallic conductors, whereas the surface with high O atom coverage is reconstructed and becomes a semiconductor. Surface Mo atoms without adsorbed O or O2 are spin-polarized...
November 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29061996/site-selective-spectroscopy-with-depth-resolution-using-resonant-x-ray-reflectometry
#15
J E Hamann-Borrero, S Macke, B Gray, M Kareev, E Schierle, S Partzsch, M Zwiebler, U Treske, A Koitzsch, B Büchner, J W Freeland, J Chakhalian, J Geck
Combining dissimilar transition metal oxides (TMOs) into artificial heterostructures enables to create electronic interface systems with new electronic properties that do not exist in bulk. A detailed understanding of how such interfaces can be used to tailor physical properties requires characterization techniques capable to yield interface sensitive spectroscopic information with monolayer resolution. In this regard resonant x-ray reflectivity (RXR) provides a unique experimental tool to achieve exactly this...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29059312/conjunctival-melanoma-in-chinese-patients-local-recurrence-metastasis-mortality-and-comparisons-with-caucasian-patients
#16
COMPARATIVE STUDY
Chuandi Zhou, Yuxin Wang, Renbing Jia, Xianqun Fan
Purpose: To evaluate the prognosis in Chinese patients with conjunctival melanoma and determine its predictors. Further, to explore the racial differences in clinical characteristics and outcomes between Chinese and Caucasian patients. Methods: This cohort study included 57 eyes of 57 consecutive patients with pathologically verified conjunctival melanoma between 1996 and 2016. Medical records were reviewed for factors associated with the local recurrence, metastasis, and tumor-related mortality...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29057645/exchange-bias-effect-and-orbital-reconstruction-in-001-oriented-lamno3-lanio3-superlattices
#17
Guowei Zhou, Zhi Yan, Yuhao Bai, Julu Zang, Zhiyong Quan, Shifei Qi, Xiaohong Xu
Paramagnetic LaNiO3 (LNO)-based heterostructures have been attracting the attention of researches, especially since the interesting exchange bias (EB) effect has been observed in (111)-oriented LaMnO3 (LMO)/LNO superlattices (SLs). However, this effect is not expected to occur in the (001) direction SLs. In this paper, we report the observation of an unexpected EB effect in (001)-oriented (LMO)3/(LNO)t SLs. The orbits of interfacial Mn/Ni ions preferentially occupy the strain-stabilized x(2) - y(2) in ultrathin LNO layers [t ≤ 4 unit cells (u...
October 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29041694/non-diffractive-bessel-gauss-beams-for-the-detection-of-rotating-object-free-of-obstructions
#18
Shiyao Fu, Tonglu Wang, Zheyuan Zhang, Yanwang Zhai, Chunqing Gao
Bessel-Gauss beams carrying orbital angular momentum are widely known for their non-diffractive or self-reconstructing performance, and have been applied in lots of domains. Here we demonstrate that, by illuminating a rotating object with high-order Bessel-Gauss beams, a frequency shift proportional to the rotating speed and the topological charge is observed. Moreover, the frequency shift is still present once an obstacle exists in the path, in spite of the decreasing of received signals. Our work indicates the feasibility of detecting rotating objects free of obstructions, and has potential as obstruction-immune rotation sensors in engine monitoring, aerological sounding, and so on...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/29041444/vortex-topographic-microscopy-for-full-field-reference-free-imaging-and-testing
#19
Petr Bouchal, Lenka Štrbková, Zbyněk Dostál, Zdeněk Bouchal
Light vortices carry orbital angular momentum and have a variety of applications in optical manipulation, high-capacity communications or microscopy. Here we propose a new concept of full-field vortex topographic microscopy enabling a reference-free displacement and shape measurement of reflective samples. The sample surface is mapped by an array of light spots enabling quantitative reconstruction of the local depths from defocused wavefronts. Light from the spots is converted to a lattice of mutually uncorrelated double-helix point spread functions (PSFs) whose angular rotation enables depth estimation...
September 4, 2017: Optics Express
https://www.readbyqxmd.com/read/29040029/autologous-fat-transfer-with-seffi-superficial-enhanced-fluid-fat-injection-technique-in-periocular-reconstruction
#20
Benjamin Riesco, Cristina Abascal, Ana Duarte, Rocio Mariel Flores, Guillermina Rouaux, Raul Sampayo, Francesco Bernardini, Martin Devoto
PURPOSE: To evaluate the aesthetic and functional outcomes of autologous fat transfer using the SEFFI (superficial enhanced fluid fat injection) technique for reconstruction of the periocular area. METHODS: Autologous fat injections prepared with the 0.5 mL and 0.8 mL SEFFI technique were used in four patients for periocular rehabilitation. RESULTS: Case 1 (C1): A patient with left-sided progressive facial hemiatrophy underwent ipsilateral volumizing with 0...
October 17, 2017: Orbit
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