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https://www.readbyqxmd.com/read/28527296/performances-and-working-mechanism-of-a-novel-polycarboxylate-superplasticizer-synthesized-through-changing-molecular-topological-structure
#1
Xiao Liu, Jianan Guan, Guanghong Lai, Ziming Wang, Jie Zhu, Suping Cui, Mingzhang Lan, Huiqun Li
A novel star-shaped polycarboxylate superplasticizer (SPCE) was synthesized through a simple two-step method. (1)H Nuclear Magnetic Resonance ((1)H NMR) and Infrared Spectroscopy (IR) measurements were used for structural characterization. SPCE and comb-shaped polycarboxylate superplasticizer (CPCE) with same molecular weights were designed and synthesized. The cement paste containing SPCE exhibited better fluidity, fluidity retention, water reduction, 25% lower saturated dosage of PCE, 10% longer setting time, lower hydration heat, more delayed hydration heat evolution and lower amount of hydration products at early ages...
May 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28527193/comparison-of-digital-intraoral-scanners-by-single-image-capture-system-and-full-color-movie-system
#2
Meguru Yamamoto, Yu Kataoka, Atsufumi Manabe
BACKGROUND: The use of dental computer-aided design/computer-aided manufacturing (CAD/CAM) restoration is rapidly increasing. OBJECTIVE: This study was performed to evaluate the marginal and internal cement thickness and the adhesive gap of internal cavities comprising CAD/CAM materials using two digital impression acquisition methods and micro-computed tomography. METHODS: Images obtained by a single-image acquisition system (Bluecam Ver...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28526569/total-joint-replacement-for-neglected-posterior-knee-dislocation-following-septic-arthritis-after-arthroscopy
#3
Yusuf Öztürkmen, Yunus Emre Akman, Ethem Ayhan Ünkar, Erhan Şükür
This report presents the first case of a knee dislocation following septic arthritis after arthroscopy. A 65-year-old woman had an arthroscopy with irrigation and debridement (I&D) of the joint and microfracture for the chondral lesions. She had complaints of postarthroscopic infection but non-steroidal anti-inflammatory medication and local ice compression was recommended. She revisited her physician twice and at the last visit she had a large purulent effusion in her knee. The gram stain of the joint fluid aspirate demonstrated gram-positive cocci and the cultures grew methicilline-sensitive Staphylococcus aureus...
May 16, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28526054/assessing-degradation-of-composite-resin-cements-during-artificial-aging-by-martens-hardness
#4
Stefan Bürgin, Nadja Rohr, Jens Fischer
BACKGROUND: Aim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging. METHODS: Four cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to allow complete polymerization (baseline). Subsequently the specimens were artificially aged by water storage at 37 °C or thermal cycling (n = 6)...
May 19, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/28524620/clinical-performance-and-survivorship-of-navigated-floating-platform-mobile-bearing-total-knee-arthroplasty-a-minimum-10-year-follow-up
#5
Sang-Min Kim, Jai-Gon Seo, Seung-Jae Lim, Hyung-Tae Lim, Chang-Ho Cho, Young-Wan Moon
BACKGROUND: The purpose of this study is to report the outcome of navigation-assisted cruciate-retaining total knee arthroplasty (TKA) using one type of cemented, second-generation, floating-platform (FP), mobile-bearing system. METHODS: Forty-two patients who underwent cruciate retaining TKAs using e.motion-FP prostheses under navigational guidance were retrospectively reviewed. The preoperative diagnosis was osteoarthritis in all knees except one rheumatoid arthritis...
May 19, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28523308/radiological-and-optical-coherence-tomography-aspects-in-external-root-resorption
#6
Sanda Mihaela Popescu, Veronica MercuŢ, Monica Scrieciu, Răzvan MercuŢ, Florin Dan Popescu, Adina Monica Chiriac, Monica Mihaela CrăiŢoiu, Eugen Osiac
Pathological external root resorption is a process by which the hard tooth substance is lost because of action of different local irritative or systemic factors. Six forms of external root resorption are described: surface external root resorption, inflammatory external root resorption, replacement external root resorption, invasive external cervical root resorption, ankylosis and transient apical breakdown. The objective of the study was to establish the prevalence of the pathological root resorption in a retrospective radiological study, to highlight radiological aspects of external root resorption and to describe optical coherence tomography (OCT) aspects in pathological root resorption...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28522402/prophylactic-vertebral-cement-augmentation-at-the-uppermost-instrumented-vertebra-and-rostral-adjacent-vertebra-for-the-prevention-of-proximal-junctional-kyphosis-and-failure-following-long-segment-fusion-for-adult-spinal-deformity
#7
George M Ghobrial, Daniel G Eichberg, John Paul G Kolcun, Karthik Madhavan, Nathan H Lebwohl, Barth A Green, Joseph P Gjolaj
BACKGROUND CONTEXT: Proximal junctional kyphosis (PJK) and proximal junctional failure (PJF) are common problems after long segment (>5 levels) thoracolumbar instrumented fusions in the treatment of adult spinal deformity (ASD). No specific surgical strategy has definitively been shown to lower the risk of PJK as the result of a multifactorial etiology. PURPOSE: To assess the incidence of PJK and PJF in patients treated with prophylactic polymethylmethacrylate(PMMA) cement augmentation at the uppermost instrumented vertebrae(UIV) and rostral adjacent vertebrae(UIV+1)...
May 15, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28518187/in-vitro-shock-absorption-tests-on-implant-supported-crowns-influence-of-crown-materials-and-luting-agents
#8
Martin Rosentritt, Sibylle Schneider-Feyrer, Michael Behr, Verena Preis
PURPOSE: To investigate the force absorption capacity of implant-supported crowns made of different restorative materials and connected to abutments with different luting agents. MATERIALS AND METHODS: Molar crowns were milled of different computer-aided design/computer-aided manufacture materials (n = 8 crowns per material): polymethyl methacrylate, polyether ether ketone, composite, lithium disilicate, titanium, and zirconia. Crowns were mounted on titanium implant replicas using different luting agents: uncemented, temporarily cemented (zinc oxide-eugenol cement), conventionally cemented (zinc oxide phosphate cement), and adhesively bonded...
May 18, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28517977/injectable-chelate-setting-hydroxyapatite-cement-prepared-by-using-chitosan-solution-fabrication-material-properties-biocompatibility-and-osteoconductivity
#9
Toshiisa Konishi, Michiyo Honda, Masaki Nagaya, Hiroshi Nagashima, Eng San Thian, Mamoru Aizawa
An injectable chelate-setting hydroxyapatite cement (IP6-HAp), formed by chelate-bonding capability of inositol phosphate (IP6), was developed. The effects of ball-milling duration of starting HAp powder and IP6 concentration on the material properties such as injectability and mechanical strength of the cement were examined. The cement powder was prepared by ball-milling the as-synthesized HAp powder for 5 min using ZrO2 beads with a diameter of 10 mm, followed by another 60 min with ZrO2 beads with a diameter of 2 mm, and thereafter surface-modified with 5000 ppm of IP6 solution...
May 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28517364/a-cryptic-pigment-biosynthetic-pathway-uncovered-by-heterologous-expression-is-essential-for-conidial-development-in-pestalotiopsis-fici
#10
Peng Zhang, Xiuna Wang, Aili Fan, Yanjing Zheng, Xingzhong Liu, Shihua Wang, Huixi Zou, Berl R Oakley, Nancy P Keller, Wen-Bing Yin
Spore pigmentation is very common in the fungal kingdom. The best studied pigment in fungi is melanin which coats the surface of single cell spores. What and how pigments function in a fungal species with multiple cell conidia is poorly understood. Here, we identified and deleted a polyketide synthase (PKS) gene PfmaE and showed that it is essential for multicellular conidial pigmentation and development in a plant endophytic fungus, Pestalotiopsis fici. To further characterize the melanin pathway, we utilized an advanced Aspergillus nidulans heterologous system for the expression of the PKS PfmaE and the Pfma gene cluster...
May 18, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28516223/two-stage-revision-hip-arthroplasty-in-periprosthetic-joint-infection-comparison-study-with-or-without-the-use-of-a-spacer
#11
Dariusz Marczak, Marek Synder, Marcin Sibiński, Michał Polguj, Julian Dudka, Jacek Kowalczewski
PURPOSE: The aim of this study was to compare two methods of two-stage surgery for PJI (periprosthetic joint infection) after THA (total hip arthroplasty): one with and one without the use of an antibiotic-loaded cement spacer. METHODS: This retrospective study was performed on 99 consecutive patients (99 hips) with a minimum follow-up of 24 months. Patients were divided into two groups: (1) in whom the operation was performed using a spacer, and (2) for whom a spacer was not used...
May 18, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28515059/antibiotic-stability-over-six-weeks-in-aqueous-solution-at-body-temperature-with-and-without-heat-treatment-that-mimics-the-curing-of-bone-cement
#12
E Samara, T F Moriarty, L A Decosterd, R G Richards, E Gautier, P Wahl
OBJECTIVES: Thermal stability is a key property in determining the suitability of an antibiotic agent for local application in the treatment of orthopaedic infections. Despite the fact that long-term therapy is a stated goal of novel local delivery carriers, data describing thermal stability over a long period are scarce, and studies that avoid interference from specific carrier materials are absent from the orthopaedic literature. METHODS: In this study, a total of 38 frequently used antibiotic agents were maintained at 37°C in saline solution, and degradation and antibacterial activity assessed over six weeks...
May 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28514314/infected-tibia-defect-fractures-treated-with-the-masquelet-technique
#13
Julia Mühlhäusser, Jörg Winkler, Reto Babst, Frank J P Beeres
The treatment after open and infected fractures with extensive soft tissue damage and bone deficit remains a challenging clinical problem. The technique described by Masquelet, using a temporary cement spacer to induce a membrane combined with reconstructive soft tissue coverage, is a possible solution. This study describes the work-up, operative procedure, complications, and the outcome of a homogenous group of patients with an open and infected tibia fracture and segmental bone loss treated with the Masquelet technique (MT)...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28513894/the-dentoalveolar-prosthesis-a-novel-approach-in-the-reconstruction-of-hard-and-soft-tissue-deficiencies
#14
James K Doll, Peter Barndt, Gerald Grant
A clinical problem commonly encountered by the advanced restorative dentist is a requirement to replace missing teeth and the supporting alveolus in areas adjacent to healthy or manageable dentition. A potential solution could utilize a dentoalveolar prosthesis fabricated on two or more implants in the edentulous area. The implant substructure, or framework, may be cast, milled, or selectively laser melted from a variety of metals. A superstructure, or ceramic overlay incorporating a ceramic or composite resin gingival tissue component, is constructed to fit over the implant substructure and luted to the substructure with resin cement...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28512620/adjacent-bilateral-stress-pedicle-fractures-after-instrumented-lumbar-fusion-a-case-report
#15
Hak Sung Kim, Sang Woo Ha, Chang Il Ju, Seok Won Kim
Bilateral pedicle stress fractures are rare even in the elderly. Bilateral pedicle fractures are due to post-surgical complications at the level of fusion or stress related activities in most cases. The authors describe a unique case of adjacent L4 bilateral pedicle fractures, which developed 4 years after anterior lumbar interbody fusion with bone cement augmented screw fixation at the L5-S1 level. As far as the authors' knowledge, no similar case has been previously reported in the literature. The pathophysiological mechanism of this rare entity is discussed with review of relevant literature...
April 2017: Korean Journal of Neurotrauma
https://www.readbyqxmd.com/read/28512498/treatment-outcomes-of-full-pulpotomy-as-an-alternative-to-tooth-extraction-in-molars-with-hyperplastic-irreversible-pulpitis-a-case-report
#16
Saeed Asgary, Prashant Verma, Ali Nosrat
Root canal therapy (RCT) is a common and successful treatment for irreversible pulpitis due to carious pulp exposure in mature permanent teeth. However, it is often an expensive procedure, may require multiple appointments, and requires a high level of training and clinical skill, specifically in molars. Uninsured patients, low-income patients, and patients with limited access to specialist care often elect for extraction of restorable teeth with irreversible pulpitis. There is a need for an alternative affordable treatment option to preserve their teeth and maintain chewing function...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28512495/endodontic-management-of-open-apex-teeth-using-lyophilized-collagen-sponge-and-mta-cement-report-of-two-cases
#17
Miriam Graziele Magro, Milton Carlos Kuga, Weber Adad Ricci, Kátia Cristina Keine, Mateus Rodrigues Tonetto, Suellen Linares Lima, Alvaro Henrique Borges, Lauriê Garcia Belizário, Matheus Coêlho Bandeca
Teeth with open apices, such as in immature teeth or those with apical root resorption are clinical cases with difficult immediate resolution. With the use of mineral trioxide aggregate (MTA) in dentistry, it was possible to optimize the treatment time of these cases by immediate placement of apical plug and the root canal filling. However, some negative effects can occur if MTA is extruded beyond the apex. To avoid this accident, it has been recommended to use of an apical matrix prior to placement of MTA...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28512492/in-vitro-sealing-properties-of-calcium-enriched-mixture-and-mineral-trioxide-aggregate-orifice-barriers-during-intra-coronal-bleaching
#18
Negar Moghadam, Amir Ardalan Abdollahi, Hoda Aghabalayi Fakhim, Zahra Borna
INTRODUCTION: This study aimed at evaluating the sealing properties of calcium-enriched mixture (CEM) compared to mineral trioxide aggregate (MTA) as a cervical barriers in intra-coronal bleaching. METHODS AND MATERIALS: In this in vitro study, endodontic treatment was performed on 60 extracted human incisors and canines without canal calcification, caries, restorations, resorption or cracks. The teeth were then randomly divided into two experimental groups and two control groups (n=15)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28512488/in-vitro-microleakage-of-mineral-trioxide-aggregate-calcium-enriched-mixture-cement-and-biodentine-intra-orifice-barriers
#19
Fatemeh Ramezanali, Sasan Aryanezhad, Fatemeh Mohammadian, Fatemeh Dibaji, Mohammad Javad Kharazifard
INTRODUCTION: This in vitro study compared the coronal microleakage of mineral trioxide aggregate (MTA), calcium-enriched mixture (CEM) cement and Biodentine as intra-orifice barriers. METHODS AND MATERIALS: The study was conducted on 76 extracted single-canal human teeth. Their root canals were prepared using ProTaper rotary files and filled with gutta percha and AH-26 sealer using lateral condensation technique. Coronal 3 mm of the gutta percha was removed from the root canals and replaced randomly with MTA, CEM cement or Biodentine in the three experimental groups (n=22)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28512485/effect-of-blood-exposure-on-push-out-bond-strength-of-four-calcium-silicate-based-cements
#20
Kazem Ashofteh Yazdi, Behnam Bolhari, Tohid Sabetmoghaddam, Naghmeh Meraji, Mohammad Javad Kharazifard
INTRODUCTION: The purpose of this study was to compare the push-out bond strength of white ProRoot Mineral Trioxide Aggregate (MTA), Biodentine, calcium-enriched mixture (CEM) cement and Endosequence Root Repair Material (ERRM) putty after exposure to blood. METHODS AND MATERIALS: A total of 96 root dentin slices with a standardized thickness of 1.00±0.05 mm and standardized canal spaces were randomly divided into 4 main experimental groups (n=24) according to the calcium silicate based cement (CSC) used: white ProRoot MTA, CEM Cement, ERRM Putty and Biodentine...
2017: Iranian Endodontic Journal
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