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Sarah Pragnère, Caroline Boulocher, Ophélie Pollet, Catherine Bosser, Aurélie Levillain, Magali Cruel, Thierry Hoc
OBJECTIVE: The purpose of this study was to assess mechanical properties along with microstructural modifications of the hyaline cartilage (HC), calcified cartilage (CC) and cortical plate (Ct.Pt), in an anterior cruciate ligament transection (ACLT) model. Medial femoral condyles of six healthy rabbits (control group) and of six ACLT rabbits 6 weeks after OA induction were explanted. The zone of interest (ZOI) for all experiments was defined as the weight bearing areas of the samples...
April 3, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Kai Zhou, Haoda Yu, Jinglong Li, Haoyang Wang, Zongke Zhou, Fuxing Pei
BACKGROUND: The debate over the use of cemented or cementless fixation in total knee arthroplasty (TKA) has never stopped since cementless fixation was introduced. We undertook a systematic review and meta-analysis to evaluate the optimal mode of fixation (full-cementless vs. full-cemented) in TKA. METHODS: PubMed, Embase, and the Cochrane Library databases up to July 2017 were searched to identify randomised controlled trials (RCTs) and quasi-RCTs comparing full-cementless TKA and full-cemented TKA...
April 12, 2018: International Journal of Surgery
Manuel Toledano, Raquel Osorio, Estrella Osorio, Inmaculada Cabello, Manuel Toledano-Osorio, Fátima S Aguilera
OBJECTIVE: The aim of this study was to evaluate the induced changes in the chemical and mechanical performance at the glass-ionomer cement-dentin interface after mechanical load application. METHODS: A conventional glass-ionomer cement (GIC) (Ketac Bond), and a resin-modified glass-ionomer cement (RMGIC) (Vitrebond Plus) were used. Bonded interfaces were stored in simulated body fluid, and then tested or submitted to the mechanical loading challenge. Different loading waveforms were applied: No cycling, 24 h cycled in sine or loaded in sustained hold waveforms...
April 10, 2018: Journal of Dentistry
Maaike Vera Jasmijn Braham, Tilman Ahlfeld, Ashwini Rahul Akkineni, Monique C Minnema, Wouter Dhert, F Cumhur Oner, Catherine Robin, Anja Lode, Michael Gelinsky, Jacqueline Alblas
The bone marrow microenvironment is the preferred location of multiple myeloma, supporting tumor growth and development. It is composed of a collection of interacting subniches, including the endosteal and perivascular niche. Current in vitro models mimic either of these subniches. By developing a model combining both niches, this study aims to further enhance the ability to culture primary myeloma cells in vitro. Also the dependency of myeloma cells on each niche was studied. A 3D bone marrow model containing two subniches was created using 3D bioprinting technology...
March 8, 2018: Tissue Engineering. Part C, Methods
Andrés M Tibabuzo Perdomo, Erik M Alberts, Stephen D Taylor, Debra M Sherman, Chia-Ping Huang, Jonathan J Wilker
Oysters construct extensive reef communities, providing food, protection from storms, and healthy coastlines. We still do not have a clear picture of how these animals attach to surfaces. Efforts described herein provide the first examination of adhesion at the transition from free swimming larvae to initial substrate attachment, through meta- morphosis, and on to adulthood. Two different bonding systems were found to coexist. Larvae use an organic, hydrated glue that persists while the animal progresses into the juvenile phase, at which point a very different adhesive emerges...
April 13, 2018: ACS Applied Materials & Interfaces
Martyn Dade-Robertson, Helen Mitrani, Javier Rodriguez Corral, Meng Zhang, Luis Hernan, Aurelie Guyet, Anil Wipat
In this paper, we describe the first steps in the design of a synthetic biological system based on the use of genetically modified bacteria to detect elevated pressures in soils and respond by cementing soil particles. Such a system might, for example, enable a self- constructed foundation to form in response to load using engineered bacteria which could be seeded and grown in the soils. This process would reduce the need for large-scale excavations and may be the basis for a new generation of self-assembling and responsive bio-based materials...
April 13, 2018: Bioinspiration & Biomimetics
Mar Collado-González, Miguel R Pecci-Lloret, Christopher J Tomás-Catalá, David García-Bernal, Ricardo E Oñate-Sánchez, Carmen Llena, Leopoldo Forner, Vinicius Rosa, Francisco J Rodríguez-Lozano
OBJECTIVE: To evaluate the in vitro cytotoxicity of Equia Forte (GC, Tokyo, Japan) and Ionostar Molar (Voco, Cuxhaven, Germany) on human dental pulp stem cells (hDPSCs). METHODS: hDPSCs isolated from third molars were exposed to several dilutions of Equia Forte and Ionostar Molar eluates (1/1, 1/2 and 1/4). These eluates were obtained by storing material samples in respective cell culture medium for 24h (n=40). hDPSCs in basal growth culture medium were the control...
April 9, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Tobias Reiner, Martin Schwarze, Benjamin Panzram, Matthias C Klotz, Rudi G Bitsch, Sebastian Jaeger
BACKGROUND: The twin peg femoral component was introduced for the cemented Oxford unicondylar knee to increase implant stability. The aim of this experimental study was to investigate the influence of the twin peg design on femoral interface temperature and maximum load to failure in comparison to the single peg design. METHODS: In this experimental study medial Oxford unicompartmental knee arthroplasty was performed in 12 pairs of fresh-frozen human knees. A cemented femoral single peg component was implanted on the one side (group A) and a cemented twin peg component on the other side (group B)...
April 5, 2018: Clinical Biomechanics
Ana Giselle Aguiar Dias, Marcela Baraúna Magno, Alberto Carlos Botazzo Delbem, Robson Frederico Cunha, Lucianne Cople Maia, Juliano Pelim Pessan
OBJECTIVES: This study compared the clinical performance of glass ionomer cement (GIC) compared to composite resin (CR) in Class II restorations in primary teeth. DATA: Literature search according to PRISMA guidelines including randomized controlled trials comparing Class II restorations performed with GIC, compared to CR, in primary teeth. SOURCES: PubMeb, Scopus, Web of Science, VHL, Cochrane Library, Clinical Trials and OpenGrey, regardless of date or language...
April 9, 2018: Journal of Dentistry
John A Hoskins
On 14 June 2017, a fire broke out at Grenfell Tower: a residential block in North Kensington, London, UK. Soon the whole tower was ablaze and it took firefighters over 24 h to get the fire under control. At least 80 people were confirmed or presumed dead and around 70 injured. Among the many reasons given for the blaze none discuss why a Tower Block, constructed in 1974, from materials whose fire safety had been checked was recently refurbished with materials considered by many to be flammable. The frame of the tower had curtain walls, originally finished with 6 infill panels constructed from 4 glass windows and two 3 ply composite panels constructed with chrysotile cement...
April 9, 2018: Toxicology and Applied Pharmacology
Areej T Almalkawi, Talal Salem, Sameer Hamadna, A G N D Darsanasiri, Parviz Soroushian, Anagi Balchandra, Ghassan Al-Chaar
Cementitious composites, including ferrocement and continuous fiber reinforced cement, are increasingly considered for building construction and repair. One alternative in processing of these composites is to infiltrate the reinforcement (continuous fibers or chicken mesh) with a flowable cementitious slurry. The relatively high density of cementitious binders, when compared with polymeric binders, are a setback in efforts to introduce cementitious composites as lower-cost, fire-resistant, and durable alternatives to polymer composites...
April 12, 2018: Materials
T Zarra, T Lambrianidis, L Vasiliadis, C Gogos
AIM: To evaluate setting time, pH, solubility and surface roughness of MTA+ and ProRoot MTA and characterize their hydration under several curing conditions. METHODOLOGY: Specimens were prepared to evaluate setting time (n=6 for each group, specimen dimensions 10x8x5mm), solubility (n=6 for each group, specimen dimension 20 mm in diameter and 1.5 mm thick) after 1 and 28 days, pH (n=10 for each group, specimen dimensions 10 mm in diameter and 1 mm thick) after 1, 7, 14, 21 and 28 days and surface roughness (n=10 for each group, specimen dimensions 4 mm in diameter and 3 mm high) after 28 days when cements were cured at 95% humidity or immersed in saline or HBSS at 37°C...
April 12, 2018: International Endodontic Journal
Peter Thissen, Carsten Natzeck, Nicolas Giraudo, Peter Weidler, Christof Wöll
Concrete is the most important construction material used by mankind and, at the same time, one of the most complex substances known in materials science. Since this mineral compound is highly porous, a better understanding of its surface chemistry, and in particular the reaction with water, is urgently required to understand and avoid corrosion of infrastructure like buildings and bridges. We have gained insight into proton transfer from concrete upon contact with water by applying the so-called Surface Science approach to a well-defined mineral, Wollastonite...
April 12, 2018: Chemistry: a European Journal
Jarrad Stevens, Gavin Macpherson, Colin Howie
Background: Removal of a well-fixed, cemented acetabular component at the time of revision hip surgery can be complex. It is essential to remove the implant and cement mantle in a timely fashion while preserving bone stock and osseous integrity. The biomechanical properties of polymethylmethacrylate cement and polyethylene can be utilised to aid with the removal of well cemented implants which are often harder than the surrounding bone. While removal of loose components may be relatively straightforward, the challenge for the revision arthroplasty surgeon often involves the removal of well-fixed implants...
June 2018: Journal of Orthopaedics
Dong Lv, Tianle Zhu, Runwei Liu, Xinghua Li, Yuan Zhao, Ye Sun, Hongmei Wang, Fan Zhang, Qinglin Zhao
To understand the effects of co-processing sewage sludge in the cement kiln on non-criterion pollutants emissions and its surrounding environment, the flue gas from a cement kiln stack, ambient air and soil from the background/downwind sites were collected in the cement plant. Polycyclic aromatic hydrocarbons (PAHs) and heavy metals of the samples were analyzed. The results show that PAHs in flue gas mainly exist in the gas phase and the low molecular weight PAHs are the predominant congener. The co-processing sewage sludge results in the increase in PAHs and heavy metals emissions, especially high molecular weight PAHs and low-volatile heavy metals such as Cd and Pb in the particle phase, while it does not change their compositions and distribution patterns significantly...
April 8, 2018: International Journal of Environmental Research and Public Health
Ana Paula Kirchheim, Erich D Rodríguez, Rupert J Myers, Luciano A Gobbo, Paulo J M Monteiro, Denise C C Dal Molin, Rui B de Souza, Maria Alba Cincotto
The tricalcium aluminate (C₃A) and sulfate content in cement influence the hydration chemistry, setting time and rheology of cement paste, mortar and concrete. Here, in situ experiments are performed to better understand the effect of gypsum on the early hydration of cubic (cub-)C₃A and Na-doped orthorhombic (orth-)C₃A. The isothermal calorimetry data show that the solid-phase assemblage produced by the hydration of C₃A is greatly modified as a function of its crystal structure type and gypsum content, the latter of which induces non-linear changes in the heat release rate...
April 7, 2018: Materials
Nicky A Mandall, Joy Hickman, Tatiana V Macfarlane, Rye Cr Mattick, Declan T Millett, Helen V Worthington
BACKGROUND: Bonding of orthodontic brackets to teeth is important to enable effective and efficient treatment with fixed appliances. The problem is bracket failure during treatment which increases operator chairside time and lengthens treatment time. A prolonged treatment is likely to increase the oral health risks of orthodontic treatment with fixed appliances one of which is irreversible enamel decalcification. This is an update of the Cochrane Review first published in 2003. A new full search was conducted on 26 September 2017 but no new studies were identified...
April 9, 2018: Cochrane Database of Systematic Reviews
L Qian, C Jiang, P Sun, D Xu, Y Wang, M Fu, S Zhong, J Ouyang
Aims The aim of this study was to compare the peak pull-out force (PPF) of pedicle-lengthening screws (PLS) and traditional pedicle screws (TPS) using instant and cyclic fatigue testing. Materials and Methods A total of 60 lumbar vertebrae were divided into six groups: PLS submitted to instant pull-out and fatigue-resistance testing (groups A1 and A2, respectively), TPS submitted to instant pull-out and fatigue-resistance testing (groups B1 and B2, respectively) and PLS augmented with 2 ml polymethylmethacrylate, submitted to instant pull-out and fatigue-resistance testing (groups C1 and C2, respectively)...
April 1, 2018: Bone & Joint Journal
M O Gauci, N Bonnevialle, G Moineau, M Baba, G Walch, P Boileau
Aims Controversy about the use of an anatomical total shoulder arthroplasty (aTSA) in young arthritic patients relates to which is the ideal form of fixation for the glenoid component: cemented or cementless. This study aimed to evaluate implant survival of aTSA when used in patients aged < 60 years with primary glenohumeral osteoarthritis (OA), and to compare the survival of cemented all-polyethylene and cementless metal-backed glenoid components. Materials and Methods A total of 69 consecutive aTSAs were performed in 67 patients aged < 60 years with primary glenohumeral OA...
April 1, 2018: Bone & Joint Journal
Khalid M Abdelaziz, Cinderella K Keshk, Abdulkhaliq Alshadidi, Salman Mafraq, David F Murchison
Aims and Objectives: To evaluate the influence of indirect chair-side polymerization of resin composite cores on the fracture resistance of overlaying IPS e.max Press crowns. Materials and Methods: Root canals of 60 extracted premolars were prepared to receive #2 fiber posts after the crowns were sectioned 2 mm above the cervical line. In Groups 1-3 ( n = 10 each), posts were luted to the prepared dowel spaces using self-adhesive resin cement. Resin composite cores were then bonded and incrementally built-up using Filtek Z250 XT, Filtek P60, and Filtek P90 resin composites...
January 2018: Journal of International Society of Preventive & Community Dentistry
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