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https://www.readbyqxmd.com/read/28536978/a-6-dof-parallel-bone-grinding-robot-for-cervical-disc-replacement-surgery
#1
Heqiang Tian, Chenchen Wang, Xiaoqing Dang, Lining Sun
Artificial cervical disc replacement surgery has become an effective and main treatment method for cervical disease, which has become a more common and serious problem for people with sedentary work. To improve cervical disc replacement surgery significantly, a 6-DOF parallel bone-grinding robot is developed for cervical bone-grinding by image navigation and surgical plan. The bone-grinding robot including mechanical design and low level control is designed. The bone-grinding robot navigation is realized by optical positioning with spatial registration coordinate system defined...
May 24, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28525471/cervical-disk-replacement-with-discover-versus-fusion-in-a-single-level-cervical-disk-disease-a-prospective-single-center-randomized-trial-with-a-minimum-2-year-follow-up
#2
Marjan Rožanković, Sergej M Marasanov, Miroslav Vukić
STUDY DESIGN: Prospective randomized study. OBJECTIVE: To compare the clinical outcome after Discover arthroplasty versus anterior cervical discectomy and fusion (ACDF) in patients treated for symptomatic single-level cervical disk disease. SUMMARY OF BACKGROUND DATA: ACDF is still the gold standard for surgical treatment of cervical spine degenerative disk disease. However, results of many studies suggest that it may cause degenerative changes at levels immediately above and below the fusion, known as adjacent segment degenerative disease...
June 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28484578/evaluation-of-five-different-desensitizers-a-comparative-dentin-permeability-and-sem-investigation-in-vitro
#3
Nasibe Aycan Yilmaz, Ertan Ertas, Hasan Orucoğlu
BACKGROUND/OBJECTIVE: The purpose of this study was to evaluate the efficacy and durability of five different dentin desensitizers (Gluma Desensitizer Powergel, Bifluorid 12, Gluma Self Etch Bond, D/Sense Crystal, Nupro Sensodyne Prophylaxis Paste with Novamin) on tubule occlusion and dentin permeability reduction in vitro. METHOD: The quantitative changes in permeability of 100 dentin discs were measured after desensitizer treatments and following post-treatments of 6% citric acid challenge for 1 min or immersion in artificial saliva for 24 hours under hydrostatic pressure generated by a computerised fluid filtration meter...
2017: Open Dentistry Journal
https://www.readbyqxmd.com/read/28473949/minimally-invasive-anterior-cervical-discectomy-without-fusion-to-treat-cervical-disc-herniations-in-patients-with-previous-cervical-fusions
#4
Robert E Jacobson, Michelle Granville, Aldo Berti
Adjacent level cervical disc disease and secondarily progressive disc space degeneration that develops years after previously successful anterior cervical fusion at one or more levels is a common, but potentially complex problem to manage. The patient is faced with the option of further open surgery which involves adding another level of disc removal with fusion, posterior decompression, and stabilization, or possibly replacing the degenerated disc with an artificial disc construct. These three cases demonstrate that some patients, especially after minor trauma, may have small herniated discs as the cause for their new symptoms rather than progressive segmental degeneration...
April 3, 2017: Curēus
https://www.readbyqxmd.com/read/28443169/radiographic-analysis-of-the-lumbosacral-juncture-is-there-a-critical-sacral-angle-for-total-disc-replacement
#5
Rattalerk Arunakul, Melodie Metzger, Linda Kanim, Hyun Bae, Michael Kropf, Rick Delamarter
STUDY DESIGN: Retrospective review of a patient cohort through a prospective study. PURPOSE: To determine whether there are correlations between radiographic measurements, including sacral slope (SS) and pelvic incidence (PI), and self-reported clinical outcomes among single-level L5/S1 ProDisc-L patients. OVERVIEW OF LITERATURE: The lumbosacral juncture presents unique biomechanical challenges with respect to artificial disc replacement (ADR) because of its orientation and consequential shear loading...
April 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28413754/an-approach-toward-replacing-vanadium-a-single-organic-molecule-for-the-anode-and-cathode-of-an-aqueous-redox-flow-battery
#6
Tobias Janoschka, Christian Friebe, Martin D Hager, Norbert Martin, Ulrich S Schubert
By combining a viologen unit and a 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) radical in one single combi-molecule, an artificial bipolar redox-active material, 1-(4-(((1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)oxy)carbonyl)benzyl)-1'-methyl-[4,4'-bipyridine]-1,1'-diium-chloride (VIOTEMP), was created that can serve as both the anode (-0.49 V) and cathode (0.67 V vs. Ag/AgCl) in a water-based redox-flow battery. While it mimics the redox states of flow battery metals like vanadium, the novel aqueous electrolyte does not require strongly acidic media and is best operated at pH 4...
April 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28402735/microhardness-and-roughness-of-infiltrated-white-spot-lesions-submitted-to-different-challenges
#7
É Y Neres, M D Moda, E K Chiba, Alf Briso, J P Pessan, T C Fagundes
A white spot lesion is the first clinical sign of a caries lesion and represents mineral loss from the enamel subsurface. The purpose of this study was to evaluate the microhardness and surface roughness of white spot lesions after application of a resin infiltrant and subjection to different challenges. Caries-like lesions were induced in bovine enamel discs (n=50), and the specimens were randomly divided into five study groups (n=10): demineralized enamel (negative control, G1), infiltrated enamel (G2), infiltrated enamel submitted to brushing (G3), infiltrated enamel submitted to pH cycling (G4), and infiltrated enamel submitted to artificial aging (G5)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28387616/long-term-clinical-and-radiographic-outcomes-of-the-prestige-lp-artificial-cervical-disc-replacement-at-2-levels-results-from-a-prospective-randomized-controlled-clinical-trial
#8
Todd H Lanman, J Kenneth Burkus, Randall G Dryer, Matthew F Gornet, Jeffrey McConnell, Scott D Hodges
OBJECTIVE The aim of this study was to assess long-term clinical safety and effectiveness in patients undergoing anterior cervical surgery using the Prestige LP artificial disc replacement (ADR) prosthesis to treat degenerative cervical spine disease at 2 adjacent levels compared with anterior cervical discectomy and fusion (ACDF). METHODS A prospective, randomized, controlled, multicenter FDA-approved clinical trial was conducted at 30 US centers, comparing the low-profile titanium ceramic composite-based Prestige LP ADR (n = 209) at 2 levels with ACDF (n = 188)...
April 7, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28365433/percutaneous-endoscopic-cervical-discectomy-pecd-an-analysis-of-outcome-causes-of-reoperation
#9
Hyeong Seok Oh, Byeong Wook Hwang, Sang Joon Park, Chang Sheng Hsieh, Sang Ho Lee
OBJECTIVE: Percutaneous endoscopic cervical discectomy (PECD) regarded as an effective treatment modality in cervical disc herniation, including radicular pain and lateral location of disc herniation. This study aimed to evaluate the clinical and radiological outcomes with PECD, along with the causes of reoperation and the technique itself. METHODS: Between January 2007 and November 2012, 101 patients underwent PECD at the Busan Wooridul hospital. Three patients underwent two-level PECD...
March 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28358860/discover-cervical-disc-arthroplasty-versus-anterior-cervical-discectomy-and-fusion-in-symptomatic-cervical-disc-diseases-a-meta-analysis
#10
Lei Shangguan, Guang-Zhi Ning, Yu Tang, Zhe Wang, Zhuo-Jing Luo, Yue Zhou
OBJECTIVE: Symptomatic cervical disc disease (SCDD) is a common degenerative disease, and Discover artificial cervical disc, a new-generation nonconstrained artificial disk, has been developed and performed gradually to treat it. We performed this meta-analysis to compare the efficacy and safety between Discover cervical disc arthroplasty (DCDA) and anterior cervical discectomy and fusion (ACDF) for SCDD. METHODS: An exhaustive literature search of PubMed, EMBASE, and the Cochrane Library was conducted to identify randomized controlled trials that compared DCDA with ACDF for patients suffering SCDD...
2017: PloS One
https://www.readbyqxmd.com/read/28325103/fabrication-and-characterization-of-dendrimer-functionalized-nano-hydroxyapatite-and-its-application-in-dentin-tubule-occlusion
#11
Xuandong Lin, Fangfang Xie, Xueling Ma, Yuhong Hao, Hejia Qin, Jindong Long
The occlusion of dentinal tubules is an effective method to alleviate the symptoms of dentin hypersensitivity. In this paper, we successfully modified nano-hydroxyapatite (n-HAP) with carboxyl-terminated polyamidoamine dendrimers by an aqueous-based chemical method and verified by fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM). Then the demineralization dentin discs were randomly divided into 4 groups, corresponding to subsequent brushing experiments: deionized water and kept in artificial saliva (AS), dendrimer-functionalized n-HAP and stored in AS, n-HAP and saved in AS, dendrimer-functionalized n-HAP and stored in deionized water...
June 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28304237/cervical-disc-arthroplasty-with-the-prestige-lp-disc-versus-anterior-cervical-discectomy-and-fusion-at-2-levels-results-of-a-prospective-multicenter-randomized-controlled-clinical-trial-at-24-months
#12
Matthew F Gornet, Todd H Lanman, J Kenneth Burkus, Scott D Hodges, Jeffrey R McConnell, Randall F Dryer, Anne G Copay, Hui Nian, Frank E Harrell
OBJECTIVE The authors compared the efficacy and safety of arthroplasty using the Prestige LP cervical disc with those of anterior cervical discectomy and fusion (ACDF) for the treatment of degenerative disc disease (DDD) at 2 adjacent levels. METHODS Patients from 30 investigational sites were randomized to 1 of 2 groups: investigational patients (209) underwent arthroplasty using a Prestige LP artificial disc, and control patients (188) underwent ACDF with a cortical ring allograft and anterior cervical plate...
March 17, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28289843/micro-ct-evaluation-of-asymmetrical-ovine-intervertebral-disc-height-loss-from-surgical-approach
#13
Christopher Ludtka, Stefan Schwan, Andrea Friedmann, Walther Brehm, Ingo Wiesner, Felix Goehre
PURPOSE: The primary goal of this study is to clearly define and evaluate new intervertebral disc height parameters in analysing the morphological pathology of disc degeneration for application in damage model and regeneration therapy development, as well as applying traditional variables to 3-D characterization methods. METHODS: A posterolateral surgical approach was used to induce disc degeneration in an ovine model. At 12-months post-operation, sheep vertebral segments were removed and characterized using micro-CT to evaluate disc height parameters in regard to injury localization...
March 13, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28272256/a-morphometric-study-of-the-middle-and-lower-cervical-vertebral-endplates-and-their-components
#14
Hang Feng, Xiang-Yi Fang, Da-Geng Huang, Cheng-Cheng Yu, Hou-Kun Li, Song-Chuan Zhao, Chao-Yuan Ge, Ru-Hai Bai, Ding-Jun Hao
Cervical disc arthroplasty is a common method of treating cervical degenerative disease. However, the footprints of most prosthesis dimensions are obtained from data of Caucasian individuals. Besides, there is a large discrepancy between footprints of currently available cervical disc prostheses and anatomic dimensions of cervical endplates. We aimed to detail the three-dimensional (3D) anatomic morphology of the subaxial cervical vertebral endplate, utilizing high-precision, high-resolution scanning equipment, and provide a theoretical basis for designing appropriate disc prostheses for Chinese patients...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28267581/comparison-of-in-vitro-dentinal-tubule-occluding-efficacy-of-two-different-methods-using-a-nano-scaled-bioactive-glass-containing-desensitising-agent
#15
Qian Ma, Tianda Wang, Qingfei Meng, Xiao Xu, Huaying Wu, Dongjing Xu, Yaming Chen
OBJECTIVE: This study aimed to compare the in vitro dentinal tubule occluding efficacy of two different methods using a nano-scaled bioactive glass (BG)-containing desensitising agent. METHODS: Citric acid treated dentine discs were randomly divided into 7 groups (n=8). Group A1, A2 and A3: dentine discs coated with BG desensitising paste; Group B1, B2 and B3: dentine discs coated with BG desensitising paste and covered with matched transparent trays; and control group (GroupC): dentine discs treated with deionised water...
May 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28261429/radiological-parameters-of-undegenerated-cervical-vertebral-segments-in-a-korean-population
#16
Sung Hoon Choi, HeeSang Lee, Jae Hwan Cho, Jin Il Jung, Dong-Ho Lee
BACKGROUND: Several scoring systems for cervical disc and facet joint degeneration, using radiography or computed tomography, have been developed and tested for reliability. However, definitions of disc height and facet joint space narrowing vary. To our knowledge, no study has reported quantitative data for normal radiologic values of the cervical spine in the Korean population. The purpose of this study is to determine normal cervical disc height, disc height ratio, and facet joint space values, and investigate the correlation between demographic data and these values...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28258266/effect-of-newly-developed-resin-cements-and-thermocycling-on-the-strength-of-porcelain-laminate-veneers
#17
Fawaz I Alqahtani
AIM: The aim of this study was to determine the effect of different luting cements and accelerated artificial aging (AAA) in the fracture resistance of porcelain laminate veneers (PLVs). MATERIALS AND METHODS: A total of 80 disc-shaped specimens were prepared using computer-aided design/computer-aided milling technology from lithium disilicate glass-ceramic blocks. Specimens (0.5 mm thick, 10 mm diameter) were divided into eight groups of 10 specimens per group...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28256492/evaluation-of-candida-albicans-biofilm-formation-on-various-dental-restorative-material-surfaces
#18
N Beldüz, A Kamburoğlu, Y Yılmaz, I Tosun, M Beldüz, C Kara
AIMS: Candida adhesion to any oral substrata is the first and essential stage in forming a pathogenic fungal biofilm. In general, yeast cells have remarkable potential to adhere to host surfaces, such as teeth or mucosa, and to artificial, nonbiological surfaces, such as restorative dental materials. This study compared the susceptibility of six dental restorative materials to Candida albicans adhesion. MATERIALS AND METHODS: Cylindrical samples of each material were made according to the manufacturersa instructions...
March 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28254671/are-patient-reported-outcomes-predictive-of-patient-satisfaction-5-years-after-anterior-cervical-spine-surgery
#19
Gregory D Schroeder, Dom Coric, Han Jo Kim, Todd J Albert, Kris E Radcliff
BACKGROUND CONTEXT: Patient satisfaction is becoming an increasing common proxy for surgical quality; however, the correlation between patient satisfaction and surgical outcomes 2 and 5 years after anterior cervical surgery has not been evaluated. PURPOSE: The study aimed to determine if patient satisfaction is predicted by improvement in patient-reported outcomes (PRO) 2 and 5 years after anterior cervical spine surgery. STUDY DESIGN: This is a retrospective analysis of prospectively collected data...
February 27, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28228539/three-dimensional-printing-spiders-back-and-forth-glue-application-yields-silk-anchorages-with-high-pull-off-resistance-under-varying-loading-situations
#20
Jonas O Wolff, Marie E Herberstein
The anchorage of structures is a crucial element of construction, both for humans and animals. Spiders use adhesive plaques to attach silk threads to substrates. Both biological and artificial adhesive structures usually have an optimal loading angle, and are prone to varying loading situations. Silk anchorages, however, must cope with loading in highly variable directions. Here we show that the detachment forces of thread anchorages of orb-web spiders are highly robust against pulling in different directions...
February 2017: Journal of the Royal Society, Interface
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