55,689 results match your criteria Cement & Concrete Composites[Journal]


Effect of unilateral pulsed jet lavage prior to vertebroplasty on the intravertebral pressure and cement distribution.

J Orthop Surg Res 2020 Jul 11;15(1):259. Epub 2020 Jul 11.

Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, People's Republic of China.

Background: Percutaneous vertebroplasty is the most common treatment for osteoporotic vertebral compression fracture. However, the morbidity of vertebroplasty-related complications, such as cement leakage, remains high. We tested a new technique of unilateral pulsed jet lavage and investigated its effect on the intravertebral pressure and bone cement distribution. Read More

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http://dx.doi.org/10.1186/s13018-020-01779-3DOI Listing

Gli1+ Periodontium Stem Cells Are Regulated by Osteocytes and Occlusal Force.

Dev Cell 2020 Jul 8. Epub 2020 Jul 8.

Department of Comprehensive Dentistry, College of Dentistry, Texas A&M University, Dallas, TX 75246, USA. Electronic address:

Teeth are attached to alveolar bone by the periodontal ligament (PDL), which contains stem cells supporting tissue turnover. Here, we identified Gli1+ cells in adult mouse molar PDL as multi-potential stem cells (PDLSCs) giving rise to PDL, alveolar bone, and cementum. They support periodontium tissue turnover and injury repair. Read More

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http://dx.doi.org/10.1016/j.devcel.2020.06.006DOI Listing

Mycobacterium fortuitum Prosthetic Joint Infection After Total Hip Arthroplasty: A Case Report.

JBJS Case Connect 2020 Apr-Jun;10(2):e0343

1Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 2Department of Orthopaedic Surgery, Adult Hip and Knee Reconstruction, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania 3Section of Infectious Diseases, Pennsylvania Hospital, Philadelphia, Pennsylvania.

Case: A 57-year-old man presented with a Mycobacterium fortuitum prosthetic joint infection (PJI) after right total hip arthroplasty refractory to the initial revision surgery and cement spacer placement. The patient was subsequently treated with 2-stage total joint arthroplasty revision surgery using an antibiotic-laden spacer customized to include meropenem and delayed reimplantation to allow for prolonged, systemic antimicrobial treatment with multiple antimicrobials, including levofloxacin and linezolid.

Conclusions: There is little evidence to guide practitioners in the diagnosis and treatment of PJI caused by rare, rapidly growing mycobacteria (RGM) such as M. Read More

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http://dx.doi.org/10.2106/JBJS.CC.18.00343DOI Listing

Antibiotic-Impregnated Intramedullary Cement Nail-Induced Acute Generalized Exanthematous Pustulosis and Septic Shock: A Case Report.

JBJS Case Connect 2020 Apr-Jun;10(2):e0441

1Department of Orthopedic Surgery, University of California-San Diego, San Diego, California.

Case: A 28-year-old woman with an infected proximal femur nonunion was treated with an antibiotic-coated intramedullary nail. Shortly after discharge, the patient presented to the emergency department and was readmitted with a morbilliform rash sparing the left lower extremity. She became hemodynamically unstable, despite cessation of intravenous antibiotics, requiring transfer to the intensive care unit and urgent removal of her antibiotic nail. Read More

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http://dx.doi.org/10.2106/JBJS.CC.19.00441DOI Listing

Clinical observation of two bone cement distribution modes of percutaneous vertebroplasty in the treatment of thoracolumbar Kümmell's disease.

J Orthop Surg Res 2020 Jul 9;15(1):250. Epub 2020 Jul 9.

Department of Orthopedic Surgery, General Hospital of Central Theater Command, Wuhan, China.

Background: In recent years, percutaneous vertebroplasty (PVP) has provided a new option for the treatment of Kümmell's disease (KD). This retrospective study aimed to investigate the differences in clinical characteristics, clinical efficacy, and related complications between two types of bone cement distribution patterns in the PVP treatment of KD.

Methods: A total of 63 patients with KD from January 2016 to February 2018 who received PVP treatment were examined at least 24 months. Read More

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http://dx.doi.org/10.1186/s13018-020-01774-8DOI Listing

Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials.

Materials (Basel) 2020 Jul 7;13(13). Epub 2020 Jul 7.

Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong, China.

Lightweight aggregate concrete manufactured by solid waste or recycled by-products is a burgeoning topic in construction and building materials. It has significant merits in mitigating the negative impact on the environment during the manufacturing of Portland cement and reduces the consumption of natural resources. In this review article, the agricultural and industrial wastes and by-products, which were used as cementitious materials and artificial lightweight aggregate concrete, are summarized. Read More

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http://dx.doi.org/10.3390/ma13133041DOI Listing

Resistance to Fracture of Zirconia Abutments with Different Angulations: Impact of Implant Platform Diameter.

Eur J Dent 2020 Jul 9. Epub 2020 Jul 9.

University of Zurich, Center of Dental Medicine, Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Zurich, Switzerland.

Objective:  The aim of this study was to assess the impact of implant platform diameters on ultimate force to failure of zirconia abutments with different angulation.

Materials And Methods:  Forty-two zirconia abutments with either 0 degree (ST) or 15-degree (AN) angulation were assembled on tapered internal connection titanium implants (Direct's Legacy; 13 mm Implant Direct, LLC, Las Vegas, United States) with a platform diameter of Ø3.0, Ø3. Read More

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http://dx.doi.org/10.1055/s-0040-1709947DOI Listing

Interfacial Fracture Toughness Comparison of Three Indirect Resin Composites to Dentin and Polyether Ether Ketone Polymer.

Eur J Dent 2020 Jul 9. Epub 2020 Jul 9.

Department of Restorative Dentistry, Tehran University of Medical Sciences, Tehran, Iran.

Objectives:  Advances in laboratory composites and their high wear resistance and fracture toughness have resulted in their growing popularity and increasing use for dental restorations. This study sought to assess the fracture toughness of three indirect composites bonded to dental substrate and polyether ether ketone (PEEK) polymer.

Materials And Methods:  This study was conducted on two groups of dental and polymer substrates. Read More

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http://dx.doi.org/10.1055/s-0040-1713309DOI Listing

The Influence of Different Designs, Materials and Cements on the Success and Survival Rate of Endocrowns. A Systematic Review.

Eur J Prosthodont Restor Dent 2020 Jul 7. Epub 2020 Jul 7.

Malmö University, Faculty of Odontology, Department of Materials Science and Technology, Carl Gustafs väg 34, SE-20506 Malmö, Sweden.

The aim is to evaluate the success and survival rate of endocrowns and the influence of design, material and cements. A search of clinical trials of endocrowns was performed using three databases (Medline/PubMed, Scopus, CochraneLibrary), complemented by a manual search. The search resulted in 2,718 studies, six of which were included for analysis. Read More

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http://dx.doi.org/10.1922/EJPRD_1992Papia12DOI Listing

Efficacy of GC Gold Label 9 and GC Miracle Mix Restorations using Atraumatic Restorative Treatment (ART) in Rural Settings: A Randomized Controlled Trial.

J Clin Pediatr Dent 2020 ;44(3):148-153

This study compared the longevity of high strength posterior glass ionomer and metal-reinforced glass ionomer using ART in rural settings within an 18-month observation period. A nonblinded parallel design randomized controlled trial was conducted among children who attended dental outreach programs in a rural area of Southern India. Atraumatic Restorative Treatment (ART) was performed in 92 permanent posterior teeth with either high strength posterior glass ionomer or metal-reinforced glass ionomer restorations. Read More

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http://dx.doi.org/10.17796/1053-4625-44.3.3DOI Listing

Early results of reverse total shoulder arthroplasty using a patient-matched glenoid implant for severe glenoid bone deficiency.

J Shoulder Elbow Surg 2020 Jul;29(7S):S139-S148

Department of Shoulder and Elbow Reconstruction, Cedars-Sinai Kerlan-Jobe Institute at Adventist Health White Memorial, Los Angeles, CA, USA.

Background: Reverse total shoulder arthroplasty (rTSA) in the presence of significant glenoid bone loss remains a challenge. This study presents preliminary clinical and radiographic outcomes of primary and revision rTSA using a patient-matched, 3-dimensionally printed custom metal glenoid implant to address severe glenoid bone deficiency.

Methods: Between September 2017 and November 2018, 19 patients with severe glenoid bone deficiency underwent primary (n = 9) or revision rTSA (n = 10) using the Comprehensive Vault Reconstruction System (VRS) (Zimmer Biomet, Warsaw, IN, USA) at a single institution. Read More

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http://dx.doi.org/10.1016/j.jse.2020.04.024DOI Listing

Influence of implant mucosal thickness on early bone loss: a systematic review with meta-analysis.

J Periodontal Implant Sci 2020 Jun 23. Epub 2020 Jun 23.

Unit of Oral Surgery, Department of Surgical, Medical, Molecular and Critical Needs Pathologies, University of Pisa, Pisa, Italy.

Purpose: Marginal bone loss (MBL) is an important clinical issue in implant therapy. One feature that has been cited as a contributing factor to this bone loss is peri-implant mucosal thickness. Therefore, in this report, we conducted a systematic review of the literature comparing bone remodeling around implants placed in areas with thick (≥2-mm) vs. Read More

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http://dx.doi.org/10.5051/jpis.1904440222DOI Listing

Therapeutic potential of HERS spheroids in tooth regeneration.

Theranostics 2020 12;10(16):7409-7421. Epub 2020 Jun 12.

State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China.

Hertwig's epithelial root sheath (HERS) plays indispensable roles in tooth root development, including controlling the shape and number of roots, dentin formation, and helping generate the cementum. Based on these characteristics, HERS cell is a potential seed cell type for tooth-related tissue regeneration. However, the application is severely limited by a lack of appropriate culture methods and small cell numbers. Read More

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http://dx.doi.org/10.7150/thno.44782DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7330840PMC

Potential of Mineral Fraction in Compost-Like-Output, Methods of Its Obtaining and the Possibility of Using It in the Context of Circular Economy.

Materials (Basel) 2020 Jul 6;13(13). Epub 2020 Jul 6.

Institute of Environmental Engineering, University of Zielona Góra, 65-417 Zielona Góra, Poland.

Most of the systems for the mechanical and biological treatment of waste used in Poland send the 0-80 mm fraction separated from the municipal waste stream, after biostabilization, entirely to a landfill. Such action is not in line with the adopted EU strategy focused on waste management in the circular cycle. The purpose of this work was to assess the technical feasibility of recovering the mineral fractions contained in compost-like-output (CLO) on the proprietary technological line designed for glass recovery. Read More

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http://dx.doi.org/10.3390/ma13133023DOI Listing

Experimental Study on Mechanical and Functional Properties of Reduced Graphene Oxide/Cement Composites.

Materials (Basel) 2020 Jul 6;13(13). Epub 2020 Jul 6.

Shandong Institute for Product Quality Inspection, Jinan 250100, China.

This study develops a novel self-sensing cement composite by simply mixing reduced graphene oxide (rGO) in cementitious material. The experimental results indicate that, owing to the excellent dispersion method, the nucleation and two-dimensional morphological effect of rGO optimizes the microstructure inside cement-based material. This would increase the electric conductivity, thermal property and self-induction system of cement material, making it much easier for cementitious material to better warn about impending damage. Read More

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http://dx.doi.org/10.3390/ma13133015DOI Listing

The Production of Antibiotic Cement Beads.

J Orthop Trauma 2020 Aug;34 Suppl 2:S41

Department of Orthopaedic Surgery, Summa Health System, Akron, OH.

The use of antibiotic beads in open fracture cases can lead to decreased rates of infection and surgeon production is associated with significant time and cost savings. This video demonstrates production of antibiotic impregnated polymethylmethacrylate beads used in the setting of a grade IIIB open tibial shaft fracture. Read More

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http://dx.doi.org/10.1097/BOT.0000000000001835DOI Listing

Percutaneous Vertebroplasty with Side-Opening Cannula or Front-Opening Cannula in the Treatment of Kummell Disease?

Orthop Surg 2020 Jul 7:e12730. Epub 2020 Jul 7.

Department of Spinal Surgery, The Second Hospital of Shandong University, Jinan, China.

Objective: To explore the effect of bone cement distribution, cement leakage, and clinical outcomes with side-opening cannula for bone cement injection in percutaneous vertebroplasty (PVP) in treatment of Kummell disease.

Methods: A prospective study of patients with Kummell disease undergoing PVP was conducted from April 2012 to September 2017. In total, 43 patients (11 males, 32 females) with Kummell disease who received bilateral PVP were included in the study. Read More

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http://dx.doi.org/10.1111/os.12730DOI Listing

Effects of HO on growth, metabolic activity and membrane integrity in three strains of Microcystis aeruginosa.

Environ Sci Pollut Res Int 2020 Jul 7. Epub 2020 Jul 7.

Department of Life & Environmental Sciences, Faculty of Science & Technology, Bournemouth University, Talbot Campus, Fern Barrow, Poole, Dorset, BH12 5BB, UK.

The application of hydrogen peroxide (HO) as a management tool to control Microcystis blooms has become increasingly popular due to its short lifetime and targeted action. HO increases intracellular reactive oxygen species resulting in oxidative stress and subsequently cell death. HO is naturally produced in freshwater bodies as a result of photocatalytic reactions between dissolved organic carbon and sunlight. Read More

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http://dx.doi.org/10.1007/s11356-020-09729-6DOI Listing

Massive Osteolytic Lesion of the Femur after Total Knee Arthroplasty.

Arthroplast Today 2020 Sep 28;6(3):463-469. Epub 2020 Jun 28.

Orthopaedics Department, Hospital Beatriz Ângelo, Loures, Portugal.

Various failure mechanisms have been identified in total knee arthroplasty (TKA). We hereby present one case of failure, which stands out because of its rapid and destructive progression. We report the case of a 72-year-old Caucasian female patient who developed a large bone osteolytic lesion of the femur after TKA. Read More

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http://dx.doi.org/10.1016/j.artd.2020.05.016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7329907PMC
September 2020

Limb Salvage and Prevention of Ulcer Recurrence in a Chronic Refractory Diabetic Foot Osteomyelitis.

Diabetes Metab Syndr Obes 2020 30;13:2289-2296. Epub 2020 Jun 30.

Department of Endocrinology and Nephrology, Diabetic Foot Center, Chongqing Emergency Medical Center, Chongqing University Central Hospital, Chongqing, People's Republic of China.

Biomechanical changes caused by structural foot deformities predispose patients to plantar ulceration. Plantar ulcer recurrence often leads to osteomyelitis, which is more commonly observed in patients with diabetes. Once the infection of diabetic foot ulcer (DFU) spreads and is complicated by osteomyelitis, treatment becomes more complicated and difficult. Read More

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http://dx.doi.org/10.2147/DMSO.S254586DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7335304PMC

Monomer release from direct and indirect adhesive restorations: A comparative in vitro study.

Dent Mater 2020 Jul 4. Epub 2020 Jul 4.

KU Leuven BIOMAT, Department of Oral Health Sciences, University of Leuven & Dentistry University Hospitals Leuven, Kapucijnenvoer 7, 3000 Leuven, Belgium. Electronic address:

Objectives: Indirect dental restorations produced by computer-aided design and computer-aided manufacturing (CAD/CAM) are relatively new in daily dental practice. The aim of the present study was to compare the monomer release between direct composite restorations and indirect CAD/CAM produced restorations (composite, ceramic and hybrid).

Methods: Identical crown restorations were prepared from three indirect materials (Cerasmart, Vitablocs Mark II and Vita Enamic) and one composite material (Clearfil AP-X). Read More

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http://dx.doi.org/10.1016/j.dental.2020.06.001DOI Listing

Development of dual-cured resin cements with long working time, high conversion in absence of light and reduced polymerization stress.

Dent Mater 2020 Jul 4. Epub 2020 Jul 4.

Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, 2730 SW Moody Ave, 97201, Portland, OR, USA. Electronic address:

Objective: This study evaluated the properties of experimental dual-cured cements containing thiourethane (TU) and low concentrations of p-Tolyldiethanolamnie (DHEPT) and benzoyl peroxide (BPO) as chemical initiators.

Methods: BisGMA/TEGDMA-based dual-cured cement was formulated with 1.0 wt% DHEPT and 0. Read More

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http://dx.doi.org/10.1016/j.dental.2020.06.005DOI Listing

Fatigue performance of adhesively luted glass or polycrystalline CAD-CAM monolithic crowns.

J Prosthet Dent 2020 Jul 5. Epub 2020 Jul 5.

Adjunct Professor, MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil. Electronic address:

Statement Of Problem: Data comparing the fatigue performance of adhesively luted glass or polycrystalline ceramic systems for computer-aided design and computer-aided manufacturing (CAD-CAM) are scarce.

Purpose: The purpose of this in vitro study was to evaluate and compare the fatigue performance of monolithic crowns manufactured from glass or polycrystalline CAD-CAM ceramic systems adhesively luted to a dentin analog.

Materials And Methods: Fifty-four pairs of standardized preparations of dentin analog (NEMA Grade G10) and simplified ceramic crowns of 1. Read More

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http://dx.doi.org/10.1016/j.prosdent.2020.03.032DOI Listing

The extension of internal humidity levels beyond the soil surface facilitates mound expansion in .

Proc Biol Sci 2020 Jul 8;287(1930):20200894. Epub 2020 Jul 8.

Wyss Institute for Biologically Inspired Engineering, Harvard University, 60 Oxford Street, Cambridge, MA 02138, USA.

Termites in the genus construct large-scale soil mounds above their nests. The classic explanation for how termites coordinate their labour to build the mound, based on a putative cement pheromone, has recently been called into question. Here, we present evidence for an alternate interpretation based on sensing humidity. Read More

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http://dx.doi.org/10.1098/rspb.2020.0894DOI Listing

Enhanced Osteogenic Differentiation of Human Primary Mesenchymal Stem and Progenitor Cultures on Graphene Oxide/Poly(methyl methacrylate) Composite Scaffolds.

Materials (Basel) 2020 Jul 5;13(13). Epub 2020 Jul 5.

School of Medicine, National University of Ireland, H91 CF50 Galway, Ireland.

Due to its versatility, small size, large surface area, and ability to interact with biological cells and tissues, graphene oxide (GO) is an excellent filler for various polymeric composites and is frequently used to expand their functionality. Even though the major advantage of the incorporation of GO is the enhancement of mechanical properties of the composite material, GO is also known to improve bioactivity during biomineralization and promote osteoblast adhesion. In this study, we described the fabrication of a composite bone cement made of GO and poly(methyl methacrylate) (PMMA), and we investigated its potential to enhance osteogenic differentiation of human primary mesenchymal stem and progenitor cells. Read More

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http://dx.doi.org/10.3390/ma13132991DOI Listing

The Recognition of the Micro-Events in Cement Composites and the Identification of the Destruction Process Using Acoustic Emission and Sound Spectrum.

Materials (Basel) 2020 Jul 4;13(13). Epub 2020 Jul 4.

Faculty of Civil Engineering, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.

This paper presents the recognition of micro-events and their concentration in quasi-brittle cement composites and the identification of the destruction process based on acoustic emission and sound spectrum. The tests were conducted on a quasi-brittle composite of a cement paste reinforced with a high volume of dispersed polypropylene fibers. The possibility of identifying the destruction process based on acoustic emission and sound spectrum was confirmed. Read More

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http://dx.doi.org/10.3390/ma13132988DOI Listing

Clinical Performance of Partial and Full-Coverage Fixed Dental Restorations Fabricated from Hybrid Polymer and Ceramic CAD/CAM Materials: A Systematic Review and Meta-Analysis.

J Clin Med 2020 Jul 4;9(7). Epub 2020 Jul 4.

Department of Reconstructive Dentistry, University Center for Dental Medicine Basel, University of Basel, 4058 Basel, Switzerland.

The aim of this systematic review and meta-analysis was to evaluate the clinical performance of tooth-borne partial and full-coverage fixed dental prosthesis fabricated using hybrid polymer and ceramic CAD/CAM materials regarding their biologic, technical and esthetical outcomes. PICOS search strategy was applied using MEDLINE and were searched for RCTs and case control studies by two reviewers using MeSH Terms. Bias risk was evaluated using the Cochrane collaboration tool and Newcastle-Ottawa assessment scale. Read More

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http://dx.doi.org/10.3390/jcm9072107DOI Listing

Assessing the environmental sustainability of an emerging energy technology: Solar thermal calcination for cement production.

Sci Total Environ 2020 Jun 26;742:140510. Epub 2020 Jun 26.

Sustainable Industrial Systems, Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, UK. Electronic address:

Cement production is a highly energy-intensive process, contributing 7% to global CO emissions. Over 80% of the energy used in cement production is consumed by the calcination process. This paper considers a novel solar thermal technology for calcination, to investigate if it could help mitigate the climate change and other environmental impacts from cement production on a life cycle basis. Read More

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http://dx.doi.org/10.1016/j.scitotenv.2020.140510DOI Listing

Synthesis, microstructure, multifunctional properties of mayenite CaAlO (C12A7) cement and graphene oxide (GO) composites.

Sci Rep 2020 Jul 6;10(1):11077. Epub 2020 Jul 6.

Center of Excellence in Smart Materials Research and Innovation, King Mongkut's Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok, 10520, Thailand.

The Pristine Mayenite CaAlO (C12A7) Cement was simply synthesized by using solid-state reaction. The C12A7 and Graphene Oxide (GO) composites (C12A7_GO-x) with various contents of the GO suspension loading (x = 0 wt%, 1 wt%, 2 wt%, 3 wt%, and 4 wt%) were directly prepared by mixing the C12A7 and GO. X-ray diffraction results of pristine C12A7 and all C12A7_GO composites indicated a pure phase corresponding to the standard of C12A7 cement. Read More

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http://dx.doi.org/10.1038/s41598-020-68073-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7338448PMC

Comparison of excess cement around implant crown margins by using 3 extraoral cementation techniques.

J Prosthet Dent 2020 Jul 4. Epub 2020 Jul 4.

Graduate student, Department of Periodontology, School of Dentistry, University of Pretoria, Pretoria, South Africa.

Statement Of Problem: Extrusion of excess cement into the subgingival area around implant-supported crowns is associated with detrimental inflammatory response, but controlling this excess material remains a challenge.

Purpose: The purpose of this in vitro study was to perform a comparative analysis of 3 extraoral cementation techniques to reduce excess extruded cementation material around implant-supported crowns.

Material And Methods: Forty-four internal connection implant replicas were embedded in acrylic resin to form the experimental model. Read More

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http://dx.doi.org/10.1016/j.prosdent.2020.04.016DOI Listing
July 2020
1.419 Impact Factor

Occupational cohort study of asbestos-cement workers in a contaminated site in Sicily (Italy).

Epidemiol Prev 2020 Mar-Jun;44(2-3):137-144

Department of Environment and Health, Istituto Superiore di Sanità, Rome (Italy).

Objectives: to analyse the asbestos-related diseases risk among the former workers of Sacelit asbestos-cement plant, operating in San Filippo del Mela (Sicily: 1958- 1993).

Design: cohort study.

Setting And Participants: 228 subjects were employed in Sacelit from 1958 to 1993. Read More

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http://dx.doi.org/10.19191/EP20.2-3.P137.036DOI Listing

The Acoustic Emission Method Implementation Proposition to Confirm the Presence and Assessment of Reinforcement Quality and Strength of Fiber-Cement Composites.

Materials (Basel) 2020 Jul 2;13(13). Epub 2020 Jul 2.

Faculty of Civil Engineering and Architecture, Kielce University of Technology, Aleja Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.

This article proposes to use the acoustic emission (AE) method to evaluate the degree of change in the mechanical parameters of fiber-cement boards. The research was undertaken after a literature review, due to the lack of a methodology that would allow nondestructive assessment of the strength of cement-fiber elements. The tests covered the components cut out from a popular type of board available on the construction market. Read More

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http://dx.doi.org/10.3390/ma13132966DOI Listing

Calibration of Steel Rings for the Measurement of Strain and Shrinkage Stress for Cement-Based Composites.

Materials (Basel) 2020 Jul 2;13(13). Epub 2020 Jul 2.

Faculty of Civil Engineering and Architecture, West Pomeranian University of Technology in Szczecin, al. Piastów 50, 70-311 Szczecin, Poland.

Concrete shrinkage is a phenomenon that results in a decrease of volume in the composite material during the curing period. The method for determining the effects of restrained shrinkage is described in Standard ASTM C 1581/C 1581M-09a. This article shows the calibration of measuring rings with respect to the theory of elasticity and the analysis of the relationship of steel ring deformation to high-performance concrete tensile stress as a function of time. Read More

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http://dx.doi.org/10.3390/ma13132963DOI Listing

Automatic Crack Detection on Road Pavements Using Encoder-Decoder Architecture.

Materials (Basel) 2020 Jul 2;13(13). Epub 2020 Jul 2.

Department of Civil, Constructional and Environmental Engineering, Sapienza University of Rome, 00184 Rome, Italy.

Automatic crack detection from images is an important task that is adopted to ensure road safety and durability for Portland cement concrete (PCC) and asphalt concrete (AC) pavement. Pavement failure depends on a number of causes including water intrusion, stress from heavy loads, and all the climate effects. Generally, cracks are the first distress that arises on road surfaces and proper monitoring and maintenance to prevent cracks from spreading or forming is important. Read More

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http://dx.doi.org/10.3390/ma13132960DOI Listing

Heat-Induced Acceleration of Pozzolanic Reaction Under Restrained Conditions and Consequent Structural Modification.

Materials (Basel) 2020 Jul 1;13(13). Epub 2020 Jul 1.

Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.

This study investigated the heat-induced acceleration of cement hydration and pozzolanic reaction focusing on mechanical performance and structural modification at the meso- and micro-scale. The pozzolanic reaction was implemented by substituting 20 wt.% of cement with silica fume, considered the typical dosage of silica fume in ultra-high performance concrete. Read More

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http://dx.doi.org/10.3390/ma13132950DOI Listing

The Disease Process, Diagnosis and Treatment of Invasive Cervical Resorption: A Review.

Dent J (Basel) 2020 Jul 1;8(3). Epub 2020 Jul 1.

Columbia University College of Dental Medicine Division of Endodontics, Columbia University, New York, NY 10032, USA.

Invasive cervical resorption (ICR) is a localized, subepithelial, supra-osseous resorptive process of the tooth. Although there are several predisposing factors associated with ICR, its etiology and pathogenesis are poorly understood. The damage to the protective layer on the external root surface appears to allow for the attachment of clastic cells and initiate the resorptive process, which is confined by the inner protective pericanalar resorption-resistant sheet surrounding the root canal space. Read More

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http://dx.doi.org/10.3390/dj8030064DOI Listing

Orthogonal Analysis on Mechanical Properties of Basalt-Polypropylene Fiber Mortar.

Materials (Basel) 2020 Jun 30;13(13). Epub 2020 Jun 30.

College of Engineering and Technology, Southwest University, Chongqing 400715, China.

Orthogonal test method was applied to analyze the strength properties of basalt-polypropylene mortar. The effect of basalt fiber length, polypropylene fiber length, basalt fiber volume content and polypropylene fiber volume content on the 28 d cube compressive strength and flexural strength were investigated. Test results show that comparing with flexural strength, the influence of basalt fiber length and polypropylene fiber length on compressive strength of mortar was greater than on flexural strength. Read More

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http://dx.doi.org/10.3390/ma13132937DOI Listing

Estimation of Viscosity and Yield Stress of Cement Grouts at True Ground Temperatures Based on the Flow Spread Test.

Materials (Basel) 2020 Jun 30;13(13). Epub 2020 Jun 30.

College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China.

The rheology of cement grouts often plays a crucial role in the success of rock grouting. In practice, the rheological parameters should be timely adjusted according to the evolution of grouting pressure, flow rate and injection time. However, obtaining the magnitude of rheological parameters is not easy to achieve under site conditions. Read More

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http://dx.doi.org/10.3390/ma13132939DOI Listing

Polymethyl Methacrylate-Based Bone Cements Containing Carbon Nanotubes and Graphene Oxide: An Overview of Physical, Mechanical, and Biological Properties.

Polymers (Basel) 2020 Jun 30;12(7). Epub 2020 Jun 30.

Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway.

Every year, millions of people in the world get bone diseases and need orthopedic surgery as one of the most important treatments. Owing to their superior properties, such as acceptable biocompatibility and providing great primary bone fixation with the implant, polymethyl methacrylate (PMMA)-based bone cements (BCs) are among the essential materials as fixation implants in different orthopedic and trauma surgeries. On the other hand, these BCs have some disadvantages, including Lack of bone formation and bioactivity, and low mechanical properties, which can lead to bone cement (BC) failure. Read More

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http://dx.doi.org/10.3390/polym12071469DOI Listing

In vivo Microbial Diversity Analysis on Different Surfaces of Dental Restorative Materials via 16S rDNA Sequencing.

Med Sci Monit 2020 Jul 6;26:e923509. Epub 2020 Jul 6.

Department of Endodontics, The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China (mainland).

BACKGROUND This study aimed to provide precise material selection guidance for proper clinical restoration and treatment of plaque-related oral diseases, such as dental caries and periodontal diseases. MATERIAL AND METHODS Four groups (n=24) of restorative material sheets (n=24) were prepared using 3M Z350 composite resin (ZR), zinc phosphate cement (ZPC), glass-ionomer (GI), and ICON permeable resin (IPR). Six volunteers wore a plaque-collection device equipped with the 4 restorative material sheets for 48 hours. Read More

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http://dx.doi.org/10.12659/MSM.923509DOI Listing

Effect of surface treatment on the retention of zirconia crowns to tooth structure after aging.

J Esthet Restor Dent 2020 Jul 6. Epub 2020 Jul 6.

Department of Clinical Sciences, University of Toronto, Toronto, Ontario, Canada.

Objective: To evaluate the effect of different surface treatments on the retention between zirconia crowns and tooth structure after in vitro aging.

Materials And Methods: Human third molars (n = 44) received crown preparations and CAD/CAM zirconia crowns were manufactured. Specimens were divided into two groups: no aging, control (NAC, n = 11) or aging (A, n = 33). Read More

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http://dx.doi.org/10.1111/jerd.12623DOI Listing

Comments on a recent case-control study of malignant mesothelioma of the pericardium and the tunica vaginalis testis.

Scand J Work Environ Health 2020 Jul 6. Epub 2020 Jul 6.

Health Sciences, Exponent, Inc., 149 Commonwealth Drive, Menlo Park, California, 94025, USA.

As the first case-control study of malignant mesothelioma of the pericardium and the tunica vaginalis testis (mTVT), the paper by Marinaccio et al (1) is potentially an important epidemiologic contribution. A careful review of the paper, however, raises a number of methodological issues. Any case-control study can be viewed as being nested within a conceptual cohort, with controls being sampled from the at-risk cohort as cases arise over time. Read More

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http://dx.doi.org/10.5271/sjweh.3909DOI Listing

[Effect of chlorhexidine on the bonding effect of self-acid adhesive to pre-treatment dentin].

Shanghai Kou Qiang Yi Xue 2020 Apr;29(2):150-154

Department of Stomatology, Gongli Hospital, Shanghai Pudong New Area.Shanghai 200135, China.

Purpose: To evaluate the effect of 2% chlorhexidine(CHX) on the self-etching adhesive to dentin.

Methods: Fifty carious free molars were selected to expose the flat dentin surface. The specimens were bonded with composite resin by self-etching adhesive ,which were pretreated by 2% CHX for 0, 15, 30, 45 and 60 s. Read More

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Operative treatment of 2-part surgical neck type fractures of the proximal humerus in the elderly: Cement augmented locking plate PHILOS™ vs. proximal humerus nail multiloc®.

Injury 2020 Jun 16. Epub 2020 Jun 16.

Department of General, Trauma and Reconstructive Surgery, University Hospital, LMU Munich, Germany.

Introduction: The purpose of this prospective randomized controlled clinical trial was to compare locked plating with intramedullary nailing in the treatment of displaced 2-part surgical neck type proximal humeral fractures in elderly patients.

Patients And Methods: Patients ≥60 years of age with a displaced 2-part surgical neck type fracture of the proximal humerus were surgically treated and randomized for either augmented locking plate fixation Group LP or multiplanar intramedullary nailing Group IN. The primary outcome parameter was the Disabilities of the Shoulder, Arm and Hand (DASH) Score after 24 months. Read More

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http://dx.doi.org/10.1016/j.injury.2020.06.026DOI Listing

Touch me if you can: The intangible but grounded nature of abstract concepts.

Behav Brain Sci 2020 Jun 19;43:e123. Epub 2020 Jun 19.

Institute of Cognitive Sciences and Technologies, Italian National Research Council, Via San Martino della Battaglia 44, 00185Rome,

Thinking about what the senses cannot grasp is one of the hallmarks of human cognition. We argue that "intangible abstracta" are represented differently from other products of abstraction, that goal-derived categorization supports their learning, and that they are grounded also in internalized linguistic and social interaction. We conclude by suggesting different ways in which abstractness contributes to cement group cohesion. Read More

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http://dx.doi.org/10.1017/S0140525X19003091DOI Listing

Is it necessary to pre-treat Dentine before GIC Restorations? Evidence from an in Vitro Study.

Acta Odontol Latinoam 2020 Apr;33(1):27-32

Centro de Pesquisas Odontológicas São Leopoldo Mandic, Faculdade São Leopoldo Mandic, Programa de Pós-graduação em Odontopediatria, Campinas, Brazil.

The aim of this study was to assess the influence of different pre-treatment approaches on glass ionomer cement (GIC) bond strength (BS) to dentine. Sixty bovine incisors were allocated into six groups according to substrate - sound or caries-affected dentine; and substrate pre-treatment approach - no conditioning (control), polyacrylic acid for 10 s and phosphoric acid for 7 s. Teeth in the caries-affected dentine group were previously submitted to cariogenic pH-cycling challenge. Read More

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Evaluating efficacy of different post materials and lengths on bonding strength between root canal dentin and post restorations: An experimental study.

Niger J Clin Pract 2020 Jul;23(7):950-956

Department of Endodontics, Faculty of Dentistry, Sivas Cumhuriyet University, Sivas, Turkey.

Background: During post restoration, different root structures require several types of posts to increase duration of their clinical use. Several materials have been investigated to enhance their quality and optimize their length according to the available root canal.

Aims: The aim of this study was to determine the effect of zirconia, fiber, and ceromer posts with 3- and 6-mm post sizes on the bonding strength of them to root canal dentinal wall with the means of pull-out bond strength test. Read More

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http://dx.doi.org/10.4103/njcp.njcp_481_19DOI Listing

Comparison of Fluoride Release in Conventional Glass-Ionomer Cements with a New Mechanical Mixing Cement.

Oral Health Prev Dent 2020 Apr 1;18(2):319-323. Epub 2020 Apr 1.

Purpose: The aim of this paper was to compare three conventional hand mixing glass-ionomer cements (GICs) and a new mechanical mixing glass-ionomer cement.

Materials And Methods: Samples were measured on days 1, 2, 6, 10, 31, 90 and 180. After 32 and 181 days of monitoring, the samples were recharged by using 1 ml of 2% sodium fluoride gel. Read More

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http://dx.doi.org/10.3290/j.ohpd.a44034DOI Listing

[Periprosthetic fractures of the acetabulum: osteosynthesis].

Chirurg 2020 Jul 2. Epub 2020 Jul 2.

Centrum für Muskuloskeletale Chirurgie, Charité - Universitätsmedizin Berlin, Berlin, Deutschland.

In most cases periprosthetic fractures of the acetabulum are complex injuries and are extremely challenging for the treating medical team. Over the years the frequency of this overall rare entity has increased due to demographic changes. In recent years several treatment algorithms were published and provided the possibility of developing standardized treatment concepts. Read More

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http://dx.doi.org/10.1007/s00104-020-01228-1DOI Listing

Selection and validation of reference genes by RT-qPCR for murine cementoblasts in mechanical loading experiments simulating orthodontic forces in vitro.

Sci Rep 2020 Jul 2;10(1):10893. Epub 2020 Jul 2.

Department of Orthodontics, Dental Clinic, University of Aachen, Pauwelsstr. 30, 52074, Aachen, Germany.

Different structures and cell types of the periodontium respond to orthodontic tooth movement (OTM) individually. Cementoblasts (OC/CM) located in the immediate vicinity of the fibroblasts on the cement have found way to the centre of actual research. Here, we identify and validate possible reference genes for OC/CM cells by RT-qPCR with and without static compressive loading. Read More

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http://dx.doi.org/10.1038/s41598-020-67449-wDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7331740PMC