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orbital reconstruction

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https://www.readbyqxmd.com/read/28332154/altered-cerebrospinal-fluid-dynamics-in-neurofibromatosis-type-l-severe-arachnoid-thickening-in-patients-with-neurofibromatosis-type-1-may-cause-abnormal-csf-dynamic
#1
Young Sill Kang, Eun-Kyung Park, Yong-Oock Kim, Ju-Seong Kim, Dong-Seok Kim, U W Thomale, Kyu-Won Shim
INTRODUCTION: The object of this study is to understand abnormal dynamic of cerebrospinal fluid (CSF) in patients with neurofibromatosis type 1 (NF1), which may cause temporal lobe herniation and bulging of temporal fossa. METHODS: Four patients, three females and one male, with NF1 were studied retrospectively. They presented with a similar craniofacial deformity, which consisted of pulsatile exophthalmos, an enlarged bony orbit, dysplasia of the sphenoid wing with the presence of a herniation of the temporal lobe into the orbit, and a bulging temporal fossa...
March 22, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28330571/use-of-3d-orbital-reconstruction-in-the-assessment-of-orbital-sexual-dimorphism-and-its-pathological-consequences
#2
N Graillon, C Boulze, P Adalian, A Loundou, L Guyot
INTRODUCTION: Surrounded by a variety of structures including the facial sinuses and the brain, the human orbit displays unique anatomical features. It is known that orbital volume correlates with age and sex. The aim of this study was to evaluate sexual dimorphism of orbital volume relative to the size of the skull, and to establish criteria for gender determination. METHODS: Orbital volume was measured from 3D models of the orbits. The volumes were expressed in relation to the centroid size of the skull, to ensure that any sexual dimorphism in orbital volume was not simply due to a difference in skull size...
February 2017: J Stomatol Oral Maxillofac Surg
https://www.readbyqxmd.com/read/28318927/classical-versus-custom-orbital-wall-reconstruction-selected-factors-regarding-surgery-and-hospitalization
#3
Rafał Zieliński, Marta Malińska, Marcin Kozakiewicz
PURPOSE: Nowadays, in orbital wall reconstruction, maxillofacial surgeons have the possibility to treat patients in modern ways such as with individual implants. Nevertheless, conventional treatment including standard titanium mesh shaped during the surgical procedure is also widely used. The aim of this study was to compare the above methods of orbital wall reconstructions. MATERIALS AND METHODS: In the first group (39 cases), patients were treated by means of computer-aided design/computer-aided manufacturing (CAD/CAM) milled individual implants made of ultra-high-molecular-weight polyethylene, dioxide zirconium and rapid prototyping titanium mesh pre-bent on an ABS model made by a three-dimensional (3D) printer...
February 17, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28318573/ophthalmic-outcomes-of-fractured-zygomas
#4
R J McGalliard, J Kimpton, N M H McLeod
In patients with fractures of the zygomatic complex, computed tomography (CT) often identifies extensive defects in the orbital floor. Some surgeons recommend routine exploration and repair of these defects during repair of the zygoma, while others advocate a more selective approach, but there is a paucity of evidence either way. We report a retrospective case series of 50 patients who had open reduction and internal fixation of zygomatic fractures by a single surgeon in the maxillofacial department at the John Radcliffe Hospital, Oxford, between 2011and 2014...
March 16, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28314402/management-of-orbital-involvement-in-sinonasal-and-ventral-skull-base-malignancies
#5
REVIEW
Gregory S Neel, Thomas H Nagel, Joseph M Hoxworth, Devyani Lal
The orbit may be frequently involved by sinonasal or ventral skull base malignancy. This involvement bodes a poorer prognosis for survival. Multimodality therapy with surgery and radiation therapy is usually attempted to optimize local control and overall survival. Oncologic surgical resection with negative margins is critical to local control and survival. In the past, any involvement of the orbit was deemed to necessitate orbital sacrifice. However, contemporary studies show that in carefully selected cases, orbital preservation does not adversely impact survival...
April 2017: Otolaryngologic Clinics of North America
https://www.readbyqxmd.com/read/28306365/ulcerative-granuloma-of-the-eyelid-as-the-initial-manifestation-of-granulomatosis-with-polyangiitis-wegener-s-granulomatosis-a-case-report
#6
Helena Brosa Morros, Olaia Subirà, Montse Gomà Gàllego, Maria José Paúles Villar, Ferran Mascaró Zamora, Maravillas Abia Serrano
A 56-year-old-man presented a 2-month history of chalazion in the eyelids without response to treatment and with an inconclusive biopsy. Laboratory results confirmed the presence of Enterobacter cloacae and Streptococcus gordonii infection. Despite appropriate intravenous antibiotic treatment, clinical worsening was observed. Radical surgical excision and total tarsorrhaphy were performed. Following treatment, the patient was asymptomatic for 6 weeks until he developed acute renal failure, generalised arthralgia, acute hypertensive anterior uveitis, and dacryoadenitis...
March 17, 2017: Orbit
https://www.readbyqxmd.com/read/28296982/management-of-extraoral-complications-in-a-patient-treated-with-four-zygomatic-implants
#7
Andrew Dawood, Nicholas Kalavresos
This article details the significant complications associated with treatment of a patient who underwent maxillary reconstruction based entirely on zygomatic implants. The use of zygomatic implants is becoming increasingly widespread, and treatment has been shown to be predictable and generally free of surgical complications. However, extending from the maxillary alveolus, alongside or through the maxillary antrum, toward the zygoma or orbital rim, these long implants have the potential to create a range of complications that may be more serious than those encountered with conventional dental implants...
March 15, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28283757/concept-of-patient-specific-shape-memory-implants-for-the-treatment-of-orbital-floor-fractures
#8
Ronny Grunert, Maximilian Wagner, Christian Rotsch, Harald Essig, Susanna Posern, Friedemann Pabst, Welf-Guntram Drossel, Juergen Lichtenstein
PURPOSE: We will aim to develop implants made of a Ni-Ti shape memory alloy which can be applied for the treatment of midface fractures, such as isolated orbital floor fractures. These can then be implanted in a compressed form and unfold automatically in the body. With the help of newly developed application instruments, the implants can be applied along transnasal and transantral approaches into the maxillary sinus. Our objective is to evaluate the operation process and the functionality of these implants, already in a pre-investigation by an experienced surgeon on a phantom...
March 10, 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28273348/performance-evaluation-of-18-f-radioluminescence-microscopy-using-computational-simulation
#9
Qian Wang, Debanti Sengupta, Tae Jin Kim, Guillem Pratx
PURPOSE: Radioluminescence microscopy can visualize the distribution of beta-emitting radiotracers in live single cells with high resolution. Here, we perform a computational simulation of (18) F positron imaging using this modality to better understand how radioluminescence signals are formed and to assist in optimizing the experimental setup and image processing. METHODS: First, the transport of charged particles through the cell and scintillator and the resulting scintillation is modeled using the GEANT4 Monte-Carlo simulation...
March 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28267399/single-stage-socket-reconstruction-with-vascularised-temporalis-muscle-flap-following-total-orbital-exenteration-description-of-3-surgical-approaches
#10
Kasturi Bhattacharjee, Harsha Bhattacharjee, Ganesh Kuri, Manpreet Singh, Manab Jyoti Barman
To describe the techniques and outcome of three different approaches to transfer the posterior 2/3(rd) temporalis muscle pedicle flap for orbital socket reconstruction following total orbital exenteration. A retrospective interventional series of 9 patients operated between February of 2000 and 2006. We describe three different techniques, namely supraorbital, transorbital and transorbitectomy approach. All patients were followed for minimum of 3 years and muscle trophism with periorbital contour was clinically studied for outcome...
March 7, 2017: Orbit
https://www.readbyqxmd.com/read/28239693/metal-passivated-pbs-nanoparticles-fabrication-and-characterization
#11
M Tchaplyguine, M-H Mikkelä, E Mårsell, C Polley, A Mikkelsen, W Zhang, A Yartsev, C J D Hetherington, L R Wallenberg, O Björneholm
Organic-shell-free PbS nanoparticles have been produced in the size range relevant for quantum-dot solar cells (QDSCs) by a vapor aggregation method involving magnetron reactive sputtering. This method creates a beam of free 5-10 nm particles in a vacuum. The dimensions of the particles were estimated after their deposition on a substrate by imaging them using ex situ SEM and HRTEM electron microscopy. The particle structure and chemical composition could be deduced "on the fly", prior to deposition, using X-ray photoelectron spectroscopy (XPS) with tunable synchrotron radiation...
February 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28230707/low-cost-3d-printing-orbital-implant-templates-in-secondary-orbital-reconstructions
#12
Alison B Callahan, Ashley A Campbell, Carisa Petris, Michael Kazim
PURPOSE: Despite its increasing use in craniofacial reconstructions, three-dimensional (3D) printing of customized orbital implants has not been widely adopted. Limitations include the cost of 3D printers able to print in a biocompatible material suitable for implantation in the orbit and the breadth of available implant materials. The authors report the technique of low-cost 3D printing of orbital implant templates used in complex, often secondary, orbital reconstructions. METHODS: A retrospective case series of 5 orbital reconstructions utilizing a technique of 3D printed orbital implant templates is presented...
February 22, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28230592/a-modified-bifurcated-periosteal-flap-for-simultaneous-reconstruction-of-upper-and-lower-lateral-canthal-tendons
#13
Yasuhiro Takahashi, Hirohiko Kakizaki
A bifurcated periosteal flap is useful for simultaneous reconstruction of the upper and lower lateral canthal tendons. The original technique harvested the flap horizontally from the frontal process of the zygoma, which mostly resulted in an insufficient flap length because of the narrowness of the zygoma. Here, the authors report the use of a modified bifurcated periosteal flap, raised from the superolateral orbital rim. The lower flap was positioned to slant inferiorly to create a downward slope of the lower eyelid for smooth lacrimal drainage by gravity...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28224428/a-new-method-of-3-dimensional-localization-of-intraocular-foreign-bodies-using-ct-imaging-a-role-of-optic-nerve
#14
Qi Yao, Han-Ping Wu, Bin Xiong, Ping Han, Chuan-Sheng Zheng
Computed tomography (CT) is considered the most sensitive method for the detection of intraocular foreign bodies (IOFBs). The purpose of this study was to evaluate a new method of 3-dimentional (3D) localization of IOFBs that takes advantage of the anatomical structure of the optic nerve and to assess the clinical outcomes using this new method. Twenty-two trauma patients with IOFBs or suspected IOFBs admitted to our hospital were scanned with multislice CT (MSCT) between July and December 2003. All scanning was performed with a 16-row spiral CT in axial plane using a sequential scanning protocol...
February 2017: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/28222893/reconstruction-of-midface-defect-from-idiopathic-destructive-process-using-medpor-implant
#15
Joel Franco, Michael S Harris, Dominic Vernon, Taha Z Shipchandler
IMPORTANCE: Reconstruction of the midface remains a challenging task for even the most experienced surgeon, with a host of reconstructive options including free tissue transfer, allografts, or prosthetic implants. Presented here is a case of idiopathic bony destruction of the right midface in a 19year old female, creating a unique defect requiring repair. OBJECTIVE: Demonstrate a unique case of severe maxillary degeneration and discuss the associated reconstructive challenges and final repair with a prosthetic implant...
January 18, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28220619/the-palatal-interpterygoid-vacuities-of-temnospondyls-and-the-implications-for-the-associated-eye-and-jaw-musculature
#16
Florian Witzmann, Ingmar Werneburg
A diagnostic feature of temnospondyls is the presence of an open palate with large interpterygoid vacuities, unlike the closed palate of most other early tetrapods, in which the vacuities are either slit-like or completely absent. Attachment sites on neurocranium and palatal bones in temnospondyls allow the reconstruction of a powerful m. retractor bulbi and a large, sheet-like m. levator bulbi that formed the elastic floor of the orbit. This muscle arrangement indicates that temnospondyls were able to retract the eyeballs through the interpterygoid vacuities into the buccal cavity, like extant frogs and salamanders...
February 21, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28211877/fresh-frozen-amniotic-membrane-for-conjunctival-reconstruction-after-excision-of-neoplastic-and-presumed-neoplastic-conjunctival-lesions
#17
U Agraval, P Rundle, I G Rennie, S Salvi
PurposeSuspicious neoplastic conjunctival lesions often require wide excision with tumour-free margins, leaving significant conjunctival defects requiring reconstruction. In this study we report the results of using fresh frozen amniotic membrane grafts (AMG) after wide excision of potentially malignant lesions.MethodsRetrospective review of 53 patients; between January 2011 and April 2014. Conjunctival lesions were excised with a non-touch technique (2 mm margin) and sent for histopathological analysis. The surgical margins were treated with cryotherapy and a fresh frozen AMG was used to cover the defect...
February 17, 2017: Eye
https://www.readbyqxmd.com/read/28210413/orbital-adherence-syndrome-following-the-use-of-titanium-precontoured-orbital-mesh-for-the-reconstruction-of-posttraumatic-orbital-floor-defects
#18
Geraldine Hwee Ping Lee, Samuel Yew Ming Ho
Orbital blowout fractures are a common occurrence following orbital trauma. Depending on the size of the defect and the contents that have herniated or incarcerated, possible sequelae include enophthalmos, diplopia, dystopia, and entrapment. Surgical intervention aims to prevent or alleviate this through the use of a bone graft or an alloplastic implant to reconstitute the continuity of the orbit. However, in doing so, the implant itself may result in the unexpected adherence of the periorbita, resulting in orbital adherence syndrome...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28210404/infraorbital-nerve-decompression-for-infraorbital-neuralgia-causalgia-following-blowout-orbital-fractures-a-case-series
#19
Bijan Beigi, Mazda Beigi, Nuwan Niyadurupola, Manuel Saldana, Nabil El-Hindy, Deepak Gupta
The purpose of this study was to present the management of a series of patients referred with infraorbital nerve paraesthesia that developed after insignificant orbital floor fracture without diplopia or exophthalmos, and that did not require initial surgical repair. This is a retrospective interventional case series. The main outcome and measures were assessment of preoperative symptoms including neuralgia and sensory symptoms; review of periorbital computed tomography (CT) scans; and assessment of postoperative effects of surgery for infraorbital nerve decompression...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28210177/orbital-reconstruction-with-a-partially-absorbable-mesh-monofilament-polypropylene-fibre-and-monofilament-poliglecaprone-25-our-experience-with-34-patients
#20
Moustafa Alkhalil, J Joshi Otero
PURPOSE: To evaluate the effectiveness and complications related to the use of a partially absorbable mesh for the reconstruction of orbital floor fractures. This is a retrospective review of 34 consecutive patients who suffered orbital trauma from August 2007 to March 2013 treated with a partially absorbable mesh for orbital reconstruction. Data collected included gender, age, nationality, cause of injury, date of admission, date of surgery, date of discharge, type of fracture, signs and symptoms such as diplopia, enophthalmos, and sensory disturbance related to the infraorbital nerve, complications before and after surgery, and follow-ups at 1 week, 1 month, 6 months, and after 1 year...
July 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
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