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https://www.readbyqxmd.com/read/29453455/temporal-structure-in-spiking-patterns-of-ganglion-cells-defines-perceptual-thresholds-in-rodents-with-subretinal-prosthesis
#1
Elton Ho, Henri Lorach, Georges Goetz, Florian Laszlo, Xin Lei, Theodore Kamins, Jean-Charles Mariani, Alexander Sher, Daniel Palanker
Subretinal prostheses are designed to restore sight in patients blinded by retinal degeneration using electrical stimulation of the inner retinal neurons. To relate retinal output to perception, we studied behavioral thresholds in blind rats with photovoltaic subretinal prostheses stimulated by full-field pulsed illumination at 20 Hz, and measured retinal ganglion cell (RGC) responses to similar stimuli ex-vivo. Behaviorally, rats exhibited startling response to changes in brightness, with an average contrast threshold of 12%, which could not be explained by changes in the average RGC spiking rate...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29451927/a-retrospective-tomographic-and-histologic-analysis-of-horizontal-bone-augmentation-in-maxillary-atrophic-ridges-using-resorbable-membrane-with-anorganic-bovine-bone-derived-mineral-and-plasma-rich-in-growth-factors
#2
Massimo Lorenzetti, Maurizio Vono, Virginia Lorenzetti
A total of six patients treated from 2010 to 2014, having a knife-edge ridge (Cawood-Howell Class IV resorbed ridges) and requiring an implant-prosthetic rehabilitation, were selected. Tomographic measurement of the edentulous ridges was performed before grafting and after implant placement. At 6 months postgraft, a total of 41 implants had been inserted, 17 in the posterior region, 12 in the central region, and 12 in the anterior region. No surgical or healing complications were recorded, and the prostheses were loaded 6 to 9 months after implant placement...
February 16, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29448880/migration-and-clinical-outcome-of-mobile-bearing-versus-fixed-bearing-single-radius-total-knee-arthroplasty
#3
Koen T Van Hamersveld, Perla J Marang-Van De Mheen, Huub J L Van Der Heide, Henrica M J Van Der Linden-Van Der Zwaag, Edward R Valstar, Rob G H H Nelissen
Background and purpose - Mobile-bearing total knee prostheses (TKPs) were developed in the 1970s in an attempt to increase function and improve implant longevity. However, modern fixed-bearing designs like the single-radius TKP may provide similar advantages. We compared tibial component migration measured with radiostereometric analysis (RSA) and clinical outcome of otherwise similarly designed cemented fixed-bearing and mobile-bearing single-radius TKPs. Patients and methods - RSA measurements and clinical scores were assessed in 46 randomized patients at baseline, 6 months, 1 year, and annually thereafter up to 6 years postoperatively...
February 16, 2018: Acta Orthopaedica
https://www.readbyqxmd.com/read/29448261/effects-of-impression-material-impression-tray-type-and-type-of-partial-edentulism-on-the-fit-of-cobalt-chromium-partial-denture-frameworks-on-initial-clinical-insertion-a-retrospective-clinical-evaluation
#4
Mirza Rustum Baig, Jaber Hussain Akbar, Muawia Qudeimat, Ridwaan Omar
PURPOSE: To evaluate the effects of impression material, impression tray type, and type of partial edentulism (ie, Kennedy class) on the accuracy of fit of cobalt-chromium (Co-Cr) partial removable dental prostheses (PRDP) in terms of the number of fabricated frameworks required until the attainment of adequate fit. MATERIALS AND METHODS: Electronic case documentations of 120 partially edentulous patients provided with Co-Cr PRDP treatment for one or both arches were examined...
February 15, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29448259/applicability-of-computerized-planimetric-method-in-estimating-plaque-accumulation-and-efficacy-of-a-cleaning-method-for-removable-dental-prostheses
#5
Ahmad Al Jaghsi, Reiner Biffar, Christiane Pink, Torsten Mundt
PURPOSE: To demonstrate how data collected using the computerized planimetric method (CPM) can be analyzed by providing an example in which the amount of plaque accumulation and the efficacy of the rotating needles device (RND) in cleaning specific parts of partial removable dental prostheses (PRDPs) were estimated. MATERIALS AND METHODS: Thirty-four participants wearing a total of 41 double-crown-retained PRDPs with veneered secondary crowns were included in this study...
February 15, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29447542/predictors-for-orthopaedic-surgery-in-patients-with-rheumatoid-arthritis-results-from-a-retrospective-cohort-study-of-1010-patients-diagnosed-from-1972-to-2009-and-followed-up-until-2015
#6
T W Nystad, A M Fenstad, O Furnes, B T Fevang
OBJECTIVES: To investigate how patient characteristics, time of diagnosis, and treatment affect the need for orthopaedic surgery in patients with rheumatoid arthritis (RA). METHOD: We reviewed the medical history of 1544 patients diagnosed with RA at Haukeland University Hospital in Bergen, Norway, from 1972 to 2009, of whom 1010 (mean age 57 years, 69% women) were included in the present study. Relevant orthopaedic procedures were obtained from the Norwegian Arthoplasty Register and the hospital's administrative patient records...
February 15, 2018: Scandinavian Journal of Rheumatology
https://www.readbyqxmd.com/read/29447314/restoration-of-periodontally-compromised-dentitions-using-telescopic-full-arch-retrievable-prosthesis-supported-by-tooth-implant-combination-a-long-term-retrospective-study
#7
Renzo Guarnieri, Stefano Ippoliti
Advanced periodontal disease is often associated with severe loss of tooth support, necessitating prosthetic rehabilitation to restore function and esthetics. For tooth-supported restorations, periodontally compromised teeth may need to be extracted due to early failure from functional overload. For tooth/implant-supported restorations, implants can be used to reduce the overload on teeth and to avoid tooth extraction, bone augmentation, or other risks associated with implant placement. The aim of this retrospective study was to evaluate the long-term outcomes of full-arch, retrievable, telescopic-retained prostheses (TRPs) on teeth and implants according to survival rate analyses and technical and biologic complications in full-mouth rehabilitation of periodontally compromised dentitions...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29447313/double-duplicate-technique-for-cad-cam-full-arch-immediate-loading-a-technical-description-and-case-report
#8
Alvise Cenzi Venezze, Paolo Ghensi, Edoardo Stellini, Vanessa Ruiz Magaz, Eriberto Bressan
Full-arch fixed implant-supported prostheses have shown high biologic success rates after long-term follow-up, along with technical and prosthetic complications. Adequate planning is necessary for immediate implant occlusal loading in a completely edentulous maxilla or mandible. For totally edentulous patients, the main prosthetic problem is the transfer of diagnostic information to the master cast when an immediate loading approach is used. The aim of this clinical case report is to illustrate a new prosthetic protocol for immediate implant loading in edentulous or potentially edentulous patients...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29447310/retrospective-evaluation-of-factors-related-to-the-outcomes-of-regenerative-therapy-for-implants-affected-by-peri-implantitis
#9
Stuart J Froum, Paul S Rosen, Wendy Cw Wang, Scott H Froum, Shalin Vinayak
The aim of this retrospective study was to examine the histories of 100 patients with 170 implants that were consecutively treated and reported in a previous study to identify which patient and implant factors might have affected the outcomes of therapy. Patient factors included history of periodontitis, hypertension, cardiac problems, rheumatoid arthritis, smoking, and penicillin allergy. Implant factors included whether the prosthesis was cemented or screw retained and initial bone loss (≤ 50% or > 50% of implant length)...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29447308/simplified-protocol-for-relining-provisional-prosthesis-on-natural-abutments-a-technical-note
#10
Fabio Galli, Matteo Deflorian, Tiziano Testori
This article describes a simplified technique for relining provisional prostheses on natural abutments that can be applied to this specific type of tooth preparation with feather-edge finish line. Starting from a diagnostic wax-up, a provisional fixed restoration is constructed, containing all the correct structural information. This includes the controlled depth of the prosthetic margin into the gingival sulcus, the emergence profile, and the area from the emergence profile to the gingival third. Chair time is saved during the clinical procedures because the finishing and polishing steps are shortened, and the resulting provisional restoration is precise and highly biocompatible...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29442096/oral-and-masticatory-rehabilitation-using-osseointegrated-dental-implants-after-resective-treatment-of-multicystic-ameloblastoma-in-the-lower-jaw-with-a-fibula-graft
#11
João Ricardo Almeida Grossi, Tatiana Miranda Deliberador, Tielly Saad, Rafaela Scariot, Joao Cesar Zielak, Allan Fernando Giovanini
Ameloblastoma is an aggressive odontogenic tumor which typically occurs between third and fourth decade of life that often needs resective approach. Immediate reconstruction may show better results. The treatment of multicystic ameloblastoma in the mandible being a rare case that occurred in the late second decade of life, which was surgically removed along with the affected teeth with safety margins, and the region was immediately reconstructed using a vascularized graft, removed from the fibula. Its integration, in combination with osseointegrated dental implants and fixed implant-supported prostheses, restored chewing function and esthetics...
January 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29442090/effect-of-chemical-disinfectants-and-accelerated-aging-on-maxillofacial-silicone-elastomers-an-in-vitro-study
#12
Anna Serene Babu, V Manju, Vinod Kumar Gopal
Context: Maxillofacial prostheses need frequent refabrication due to degradation of color and deterioration of physical properties of the elastomer. Aims: This study attempted to evaluate the change in color stability, Shore A hardness, and surface roughness of two maxillofacial silicones, A-2186 and Cosmesil M511, when submitted to chemical disinfection and accelerated aging. Settings and Design: This was a comparative in vitro study. Subjects and Methods: The materials included two silicone elastomers - A-2186 and Cosmesil M511 (Factor II Incorporated) - functional intrinsic red pigment and three disinfectants - Fittydent tablet, chlorhexidine gluconate 4%, and neutral soap...
January 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29441506/development-of-a-procedure-for-the-government-provision-of-bone-anchored-prosthesis-using-osseointegration-in-australia
#13
Laurent Frossard, Gregory Merlo, Tanya Quincey, Brendan Burkett, Debra Berg
BACKGROUND: Governmental organizations are facing challenges in adjusting procedures providing equitable assistance to consumers with amputation choosing newly available osseointegrated fixations for bone-anchored prostheses (BAPs) over socket-suspended prostheses. OBJECTIVES: The aims of this study were to (1) present a procedure focusing on tasks, documents and costs of prosthetic care, and (2) share observed obstacles and facilitators to implementation. METHODS: This research aimed at developing a governmental procedure for the provision of BAPs was designed as an action research study...
December 2017: PharmacoEconomics Open
https://www.readbyqxmd.com/read/29439922/increased-precision-of-coronal-plane-outcomes-in-robotic-assisted-total-knee-arthroplasty-a-systematic-review-and-meta-analysis
#14
REVIEW
Ashim Mannan, James Vun, Christopher Lodge, Alistair Eyre-Brook, Simon Jones
BACKGROUND: Inaccuracy of component alignment in total knee arthroplasty adversely impacts outcomes. Robotic systems improve translation of pre-operative planning to intra-operative steps, theoretically resulting in greater accuracy and precision. In this study we systematically review literature data of alignment outcomes and apply meta-analysis methods to assess whether robotic-assisted knee arthroplasty provides superior outcomes when compared to conventional knee prostheses. METHODS: A PRISMA compliant search comparing alignment outcomes in robotic vs conventional knee arthroplasty was performed...
February 10, 2018: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
https://www.readbyqxmd.com/read/29437847/dental-students-perceived-clinical-competence-in-prosthodontics-comparison-of-traditional-and-problem-based-learning-methodologies
#15
Javier Montero, Abraham Dib, Yasmina Guadilla, Javier Flores, Juan Antonio Santos, Rosa Anaya Aguilar, Cristina Gómez-Polo
The aim of this study was to compare the perceived competence for treating prosthodontic patients of two samples of fourth-year dental students: those educated using traditional methodologies and those educated using problem-based learning (PBL). Two cohorts of fourth-year dental students at a dental school in Spain were surveyed: the traditional methods cohort (n=46) was comprised of all students in academic years 2012 and 2013, and the PBL cohort (n=57) was comprised of all students in academic years 2014 and 2015...
February 2018: Journal of Dental Education
https://www.readbyqxmd.com/read/29435519/analysis-of-the-causes-of-dental-implant-fracture-a-retrospective-clinical-study
#16
Biser Stoichkov, Dimitar Kirov
OBJECTIVE: Fracture of osseointegrated dental implants is the most severe mechanical complication. The aim of the present study was to analyze possible causative factors for implant body fracture. METHOD AND MATERIALS: One hundred and one patients with 218 fitted implants and a follow-up period of 3 to 10 years were studied. Factors associated with biomechanical and physiologic overloading such as parafunctional activity (eg, bruxism), occlusion, and cantilevers, and factors related to the planning of the dental prosthesis, available bone volume, implant area, implant diameter, number of implants, and their inclination were tracked...
February 12, 2018: Quintessence International
https://www.readbyqxmd.com/read/29433767/alloplastic-temporomandibular-joint-replacement-systems-a-systematic-review-of-their-history
#17
REVIEW
N De Meurechy, M Y Mommaerts
This systematic review provides an overview of the historical evolution of the prosthetic temporomandibular joint and addresses the challenges and complications faced by engineers and surgeons, in an effort to shed light on why only a few systems remain available. A better understanding of the history of temporomandibular joint prostheses might also provide insights into the origin of the negative public opinion of the prosthesis, which is based on outdated information. A computerized search using the PubMed Central, ScienceDirect, Wiley Online, Ovid, and Cochrane Library databases was performed following the PRISMA guidelines...
February 9, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29433583/mid-term-survivorship-of-cruciate-retaining-versus-posterior-stabilized-total-knee-arthroplasty-using-modular-mini-keel-tibial-implants
#18
Cheng-Pang Yang, Kuo-Yao Hsu, Yu-Han Chang, Yi-Sheng Chan, Hsin-Nung Shih, Alvin Chao-Yu Chen
BACKGROUND: Reports of diverse outcomes in modular mini-keel tibial componentry for total knee arthroplasty (TKA) have raised concerns about early aseptic loosening. Cruciate-retaining (CR) prostheses, using mini-keel implants, have yet to be reported and compared to posterior-stabilizing (PS) designs. METHODS: A retrospective, case-matched study of 91 consecutive TKAs (n = 46 CR; n = 45 PS prostheses), using modular mini-keel tibial componentry with a 45-mm drop down stem extension, was conducted...
February 13, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29432304/anemia-in-adolescents-and-young-adult-patients-with-congenital-heart-disease
#19
Juan L Rodríguez-Hernández, Fayna Rodríguez-González, Efrén Martínez-Quintana
INTRODUCTION: Despite anemia in acquired heart disease being a common problem, little is known in patients with congenital heart disease (CHD). METHODS: In total, 544 consecutive stable noncyanotic CHD patients were studied to determine demographic, clinical, and analytic parameters. Anemia was defined as a condition in which hemoglobin concentration was <13 g/dL in male individuals and <12 g/dL in female individuals. RESULTS: In total, 49 (9%) CHD patients had anemia...
February 9, 2018: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/29432270/what-is-the-long-term-survival-for-primary-tha-with-small-head-metal-on-metal-bearings
#20
Richard de Steiger, Andrea Peng, Peter Lewis, Stephen Graves
BACKGROUND: Large-head metal-on-metal (MoM) bearing hip replacements have been shown to have a much higher rate of revision than other bearing surfaces. However, small-head (≤ 32 mm) MoM bearing surfaces have been in use for many years with several reports of satisfactory mid- to long-term survivorship. It is unclear whether the long-term survival of small-head MoM devices will continue to be satisfactory or whether the same concerns seen with the large-head MoM devices will ultimately become more prevalent...
February 8, 2018: Clinical Orthopaedics and related Research
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