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Leila Fathyunes, Jafar Khalil-Allafi
In the present work, we investigated the effect of employing ultrasonic waves during pulse electrochemical deposition on surface topography, chemical composition and biocompatibility of calcium phosphate (Ca-P) coatings. The SEM and 3D AFM images showed that the anodized titanium surface was covered with the uniform and refined size of plate-like Ca-P crystals, when the ultrasonic treatment of the electrolyte with power of 60 W was carried out during deposition. In contrast, for the Ca-P; 0 W coating applied under only the magnetic stirring of the electrolyte, the microstructure was non-uniform and some Ca-P crystals with the larger size were randomly observed in different regions, causing a rougher surface...
April 2018: Ultrasonics Sonochemistry
Marcela C Rodrigues, Marina D S Chiari, Yvette Alania, Livia C Natale, Victor E Arana-Chavez, Marcia M Meier, Victória S Fadel, Flavio M Vichi, Thiago L R Hewer, Roberto R Braga
OBJECTIVES: This study describes the synthesis of brushite nanoparticles (CaHPO4·2H2O) functionalized with triethylene glycol dimethacrylate (TEGDMA) and their application in dental restorative composites with remineralizing capabilities. METHODS: Nanoparticles were synthesized, with TEGDMA being added to one of the precursor solutions at three different molar ratios (0:1, 0.5:1 and 1:1, in relation to the ammonium phosphate precursor). Then, they were added (10 vol%) to a photocurable dimethacrylate matrix containing 50 vol% of reinforcing glass particles...
February 5, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Hanan H Beherei, Abdallah A Shaltout, Mostafa Mobrouk, Nayera A M Abdelwahed, Diganta B Das
Novel non-porous membranes were prepared by impregnating of brushite and niobium pentoxide (Nb2O5) into a gelatin/alginate matrix. The physicochemical properties, morphology and mechanical properties of the prepared membranes were characterized using XRD, FTIR, SEM, TEM and universal testing machine, respectively. Swelling ability of the prepared membranes was determined in distilled water. The surfaces of the membranes were characterized by means of FTIR and SEM coupled with EDX after submersion in simulated body fluid (SBF) up to 15 days...
January 31, 2018: Journal of Pharmaceutical Sciences
Raquel Osorio, Manuel Toledano-Osorio, Estrella Osorio, Fátima S Aguilera, Sussette Padilla-Mondéjar, Manuel Toledano
OBJECTIVES: Biomaterials for treating dentin hypersensitivity and dentin wear were evaluated to efficiently occlude the dentinal tubules and to increase dentin resistance to abrasion. MATERIALS AND METHODS: Twenty-four dentin surfaces were treated with EDTA to expose dentinal tubules and were (1) non-brushed, (2) brushed with distilled water, or with pastes containing (3) monetite, (4) brushite, (5) Zn-monetite, (6) Zn-brushite, (7) Silica-brushite, and (8) NovaMin®...
February 5, 2018: Clinical Oral Investigations
Barbe Rentsch, Anne Bernhardt, Anja Henß, Seemun Ray, Claudia Rentsch, Martha Schamel, Uwe Gbureck, Michael Gelinsky, Stefan Rammelt, Anja Lode
Remodeling of calcium phosphate bone cements is a crucial prerequisite for their application in the treatment of large bone defects. In the present study trivalent chromium ions were incorporated into a brushite forming calcium phosphate cement in two concentrations (10 and 50 mmol/mol β-tricalcium phosphate) and implanted into a femoral defect in rats for 3 and 6 month, non-modified brushite was used as reference. Based on our previous in vitro findings indicating both an enhanced osteoclastic activity and cytocompatibility towards osteoprogenitor cells we hypothesized a higher in vivo remodeling rate of the Cr3+ doped cements compared to the reference...
January 17, 2018: Acta Biomaterialia
Meng Li, Jing Zhang, Lijun Wang, Baoshan Wang, Christine V Putnis
Potential pathways for inhibiting crystal growth are either via disrupting local microenvironments surrounding crystal-solution interfaces or physically blocking solute molecule attachment. However, the actual mode of inhibition may be more complicated due to the characteristic time scale for the inhibitor adsorption and relaxation to a well-bound state at crystal surfaces. Here we demonstrate the role of citrate (CA) and hydroxycitrate (HCA) in brushite (DCPD, CaHPO4·2H2O) crystallization over a broad range of both inhibitor concentrations and supersaturations by in situ atomic force microscopy (AFM)...
January 18, 2018: Journal of Physical Chemistry. B
Mohammad Hadi Radfar, Behnam Shakiba
We read with great interest the paper by York and colleagues [1] entitled "Randomized controlled trial comparing three different modalities of lithotrites for intracorporeal lithotripsy in PCNL". This study showed that the safety and efficacy of Cyberwand, Lithoclast Select, and the StoneBreaker lithotripters are similar and comparable. They stated that "the clearance rate of "hard" stones (defined as brushite, cystine, and uric acid stones) was comparable across the 3 groups). We would like to point out that this statement is one side of the coin...
January 8, 2018: Journal of Endourology
Vuk Uskoković, Julietta V Rau
Here we report on the nonlinear, oscillatory dynamics detected in the evolution of phase composition during the setting of different calcium phosphate cements, two of which evolved toward brushite and one toward hydroxyapatite as the final product. Whereas both brushite-forming cements contained ion-doped β-tricalcium phosphate as the initial phase, the zinc-containing one yielded scholzite as an additional phase during setting and the oscillations between these two products were pronounced throughout the entire 80 h setting period, long after the hardening processes was over from the mechanical standpoint...
2017: RSC Advances
A F M Cardenas, F S F Siqueira, M C Bandeca, S O Costa, M V S Lemos, V P Feitora, A Reis, A D Loguercio, J C Gomes
PURPOSE: To evaluate the immediate microshear resin-enamel bond strength (μSBS) and the immediate and 6-month microtensile bond strength (μTBS) and nanoleakage (NL) of the adhesive interface performed by different pHs of 40% meta-phosphoric acid (MPA) were compared with conventional 37% ortho-phosphoric acid (OPA) under different application times. Additionally, the enamel etching patterns were evaluated and the chemical/morphological changes induced by these differents groups were evaluated...
November 22, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Aleksandra Laskus, Joanna Kolmas
Calcium phosphate materials (CaPs) are similar to inorganic part of human mineralized tissues (i.e., bone, enamel, and dentin). Owing to their high biocompatibility, CaPs, mainly hydroxyapatite (HA), have been investigated for their use in various medical applications. One of the most widely used ways to improve the biological and physicochemical properties of HA is ionic substitution with trace ions. Recent developments in bioceramics have already demonstrated that introducing foreign ions is also possible in other CaPs, such as tricalcium phosphates (amorphous as well as α and β crystalline forms) and brushite...
November 27, 2017: International Journal of Molecular Sciences
Michael Grasso
A central component of percutaneous nephrostolithotomy is an endoscopic lithotrite that safely and efficiently clears stone of all compositions from the intrarenal collecting system. The current multicenter trial studied 3 lithotrite combinations employing both mechanical ballistic and ultrasonic energy to fragment and evacuate with suction stone debris. What is clear from this work is that, with regard to the timely clearance of the stone burden and peri-operative complications, there is minimal difference between the devices studied, nothing special and nothing new...
November 22, 2017: Journal of Endourology
Md Lemon Hasan, Mirana Taz, Byong-Taek Lee
In this study, we focused on identifying the effects of platelet-rich plasma (PRP) on bioactivity and bone ingrowths incorporated into brushite cement. We introduced PRP as a series of substitutions with an aqueous citrate-ion solution, and the optimized cement with PRP showed no disintegration of the paste consistency. Incorporating PRP showed that the setting time decreased with the increasing of PRP ratios, although the compressive strength was not significantly changed. We evaluated in vitro degradation and bioactivity with the simulated body fluid test, and the result showed that adding PRP accelerated the carbonated apatite nucleation and markedly improved the surface reactivity of the cement...
November 6, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Elke Kunisch, Stefan Maenz, Marie Knoblich, Frank Ploeger, Klaus D Jandt, Joerg Bossert, Raimund W Kinne, Saifeddin Alsalameh
A pre-washing protocol was developed for resorbable, brushite-forming calcium phosphate cements (CPCs) to avoid harmful in vitro effects on cells. CPC discs (JectOS+, Kasios; self-developed CPC) were pre-washed with repeated changes of phosphate-buffered saline (PBS; 24h total). Unwashed or PBS-pre-washed discs were incubated in culture medium (5% fetal calf serum; up to 10days) and then tested for their influence on pH/calcium/phosphate levels in H2O extracts. Effects on pH/calcium/phosphate levels in culture supernatants, and morphology, adherence, number, and viability of ATDC5 cells and adipose-tissue derived stem cells were analyzed in co-culture...
October 14, 2017: Tissue & Cell
Alexander Hanke, Martin Bäumlein, Siegmund Lang, Boyko Gueorguiev, Michael Nerlich, Thomas Perren, Paavo Rillmann, Christian Ryf, Theodore Miclau, Markus Loibl
OBJECTIVES: Synthetic bone grafts (SBGs) are widely used to fill bone defects after fracture reduction. This study assessed the long-term resorption of two different calcium phosphate products (A=ChronOS™ inject and B=Norian(®) SRS(®); both DePuy Synthes, Oberdorf, Switzerland) used in the surgical treatment of tibial plateau fractures. DESIGN: Long-term clinical and radiologic follow-up of 52 patients after surgical treatment of intraarticular tibial plateau fractures augmented with SBGs...
October 19, 2017: Injury
Guoyuan Li, Lei Zhang, Lei Wang, Guangyin Yuan, Kerong Dai, Jia Pei, Yongqiang Hao
Osteoporotic fracture (OPF) remains a major clinical challenge for skeletal regeneration. Impaired osteogenesis and excessive remodeling result in prolonged and poor quality of fracture healing. To augment bone formation and inhibit excessive resorption simultaneously, we constructed a biodegradable magnesium-based implant integrated with the anti-catabolic drug zoledronic acid (ZA); this implant exhibits controllable, sustained release of magnesium degradation products and ZA in vitro. The extracts greatly stimulate the osteogenic differentiation of rat-bone marrow-derived mesenchymal stem cells (rBMSCs), while osteoclastogenesis is inhibited by ZA...
October 24, 2017: Acta Biomaterialia
Francesca Gunnella, Elke Kunisch, Stefan Maenz, Victoria Horbert, Long Xin, Joerg Mika, Juliane Borowski, Sabine Bischoff, Harald Schubert, Andre Sachse, Bernhard Illerhaus, Jens Günster, Jörg Bossert, Klaus D Jandt, Frank Plöger, Raimund W Kinne, Olaf Brinkmann, Matthias Bungartz
BACKGROUND CONTEXT: Targeted delivery of osteoinductive bone morphogenetic proteins (BMPs; e.g., GDF5) in bioresorbable calcium phosphate cement (CPC), potentially suitable for vertebroplasty/kyphoplasty of osteoporotic vertebral fractures, may be required to counteract augmented local bone catabolism and support complete bone regeneration. The biologically optimized GDF5 mutant BB-1 may represent an attractive drug candidate for this purpose. PURPOSE: The aim of the current study was to test an injectable, poly (l-lactide-co-glycolide) acid (PLGA)-fiber reinforced, brushite-forming cement (CPC) containing low-dose BB-1 in a sheep lumbar osteopenia model...
October 12, 2017: Spine Journal: Official Journal of the North American Spine Society
Seyed Mohammad Hossein Dabiri, Alberto Lagazzo, Fabrizio Barberis, Amirreza Shayganpour, Elisabetta Finocchio, Laura Pastorino
A Series of in-situ alginate-brushite (Alg-Bru) hydrogel composites were fabricated to optimize release profile of ibuprofen (Ibu) and to avoid burst releases associated with the pure form of the hydrogels. The Bru crystals were synthetized and dispersed during the crosslinking process of Alg matrix. The beads with different formulations were subject to various characterization tests such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and swelling...
December 1, 2017: Carbohydrate Polymers
Jun Luo, Francisco Javier Martinez-Casado, Olivier Balmes, Jiaojiao Yang, Cecilia Persson, Håkan Engqvist, Wei Xia
Brushite cements are fast self-setting materials that can be used as bone substitute materials. Although tracing their fast setting process is a challenge, it is important for the understanding of the same, which in turn is important for the material's further development and use in the clinics. In this study, the setting rate, phase formation, and crystal growth of brushite cements were quantitatively studied by in situ synchrotron powder X-ray diffraction (SXRD) on a time scale of seconds. The influence of reactant ratios and a retardant (citric acid) on the setting reaction were analyzed...
October 18, 2017: ACS Applied Materials & Interfaces
Stephanie G Nykamp
OBJECTIVE To determine whether dual-energy CT (DECT) could accurately differentiate the composition of common canine uroliths in a phantom model. SAMPLE 30 canine uroliths with pure compositions. PROCEDURES Each urolith was composed of ≥ 70% struvite (n = 10), urate (8), cystine (5), calcium oxalate (4), or brushite (3) as determined by standard laboratory methods performed at the Canadian Veterinary Urolith Centre. Uroliths were suspended in an agar phantom, and DECT was performed at low (80 kV) and high (140 kV) energies...
October 2017: American Journal of Veterinary Research
Gil F Tansman, Paul S Kindstedt, John M Hughes
This report documents an observational study of a high-moisture washed-rind cheese. Three batches of cheese were sampled on a weekly basis for 6 wk and again at wk 10. Center, under-rind, rind, and smear samples were tested for pH, moisture, and selected mineral elements. Powder x-ray diffractometry and petrographic microscopy were applied to identify and image the crystal phases. The pH of the rind increased by over 2 pH units by wk 10. The pH of the under-rind increased but remained below the rind pH, whereas the center pH decreased for most of aging and only began to rise after wk 5...
November 2017: Journal of Dairy Science
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