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S Varitis, P Kavouras, E Pavlidou, E Pantazopoulou, G Vourlias, K Chrissafis, A I Zouboulis, Th Karakostas, Ph Komninou
The vitrification process was applied for the stabilization and solidification of a rich in chromium ash that was the by-product of incineration of tannery sludge. Six different batch compositions were produced, based on silica as the glass former and sodium and calcium oxides as flux agents. As-vitrified products (monoliths) were either composed of silicate matrices with separated from the melt Eskolaite (Cr2O3) crystallites or were homogeneous glasses (in one case). All as-vitrified products were thermally treated in order to transform them to partially crystallized, i...
October 17, 2016: Waste Management
Doğu Ömür Dede, Gözlem Ceylan, Burak Yilmaz
STATEMENT OF PROBLEM: Resin cements are available in various shades from different manufacturers. However, there is no standard for the optical properties of these cements, which may result in differences in the color of translucent ceramic restorations. PURPOSE: The purpose of this in vitro study was to evaluate the effects of different shades and brands of resin cements on the color of a lithium disilicate ceramic. MATERIALS AND METHODS: Ten ceramic disks (11×1...
October 17, 2016: Journal of Prosthetic Dentistry
Chu-Qiang Qin, Dong-Sheng Huang, Chi Zhang, Bin Song, Jian-Bin Huang, Yue Ding
BACKGROUND: Aseptic loosening is a significant impediment to joint implant longevity. Prosthetic wear particles are postulated to play a central role in the onset and progression of periprosthetic osteolysis, leading to aseptic loosening of the prosthesis. METHODS: We investigated the inhibitory effects of a lentivirus-mediated short hairpin RNA that targets the TNF-alpha gene on the particle-induced inflammatory and osteolytic changes via macrophages both in vitro and in vivo...
October 18, 2016: BMC Musculoskeletal Disorders
J Mesquita-Guimarães, M A Leite, J C M Souza, B Henriques, F S Silva, D Hotza, A R Boccaccini, M C Fredel
In this work, TiO2 ceramic scaffolds were fabricated by the replica method using polyurethane (PU) sponges. Suspensions with high solid content were used to achieve scaffolds with improved mechanical behavior. TiO2 ceramic suspensions were optimized by rheological studies using different additives. It was found that the composition with 0.5 wt% Darvan enhanced the covering of the sponge struts. PU sponges of 45 to 80 ppi (pore per inch) were well coated without clogging pores. A thermal treatment with varying holding times, temperatures and heating rates was adjusted...
October 17, 2016: Journal of Biomedical Materials Research. Part A
Lorena Oliveira Pedroche, Sérgio Rocha Bernardes, Moira Pedroso Leão, Cibele Cândida de Almeida Kintopp, Gisele Maria Correr, Bárbara Pick Ornaghi, Carla Castiglia Gonzaga
The objective of this study was to evaluate the marginal and internal fit of zirconia copings obtained with different digital scanning methods. A human mandibular first molar was set in a typodont with its adjacent and antagonist teeth and prepared for an all-ceramic crown. Digital impressions were made using an intraoral scanner (3Shape). Polyvinyl siloxane impressions and Type IV gypsum models were also obtained and scanned with a benchtop laboratory scanner (3Shape D700). Ten zirconia copings were fabricated for each group using CAD-CAM technology...
October 10, 2016: Brazilian Oral Research
Cody C Wyles, Benjamin A McArthur, Eric R Wagner, Matthew T Houdek, Jose H Jimenez-Almonte, Robert T Trousdale
Trunnionosis and taper corrosion have recently emerged as problems in total hip arthroplasty (THA). No longer restricted to metal-on-metal bearings, these phenomena now affect an increasing number of metal-on-polyethylene THAs and are exacerbated by modularity. Resulting increases in metal toxicity and patient morbidity, and the added costs of toxicity surveillance and revision surgery, will place a substantial economic burden on many health systems. Although they are more expensive than cobalt-chrome heads, ceramic femoral heads make metal toxicity a nonissue...
September 2016: American Journal of Orthopedics
Becky M Hess, Brett G Amidan, Kevin K Anderson, Janine R Hutchison
Restoring all facility operations after the 2001 Amerithrax attacks took years to complete, highlighting the need to reduce remediation time. Some of the most time intensive tasks were environmental sampling and sample analyses. Composite sampling allows disparate samples to be combined, with only a single analysis needed, making it a promising method to reduce response times. We developed a statistical experimental design to test three different composite sampling methods: 1) single medium single pass composite (SM-SPC): a single cellulose sponge samples multiple coupons with a single pass across each coupon; 2) single medium multi-pass composite: a single cellulose sponge samples multiple coupons with multiple passes across each coupon (SM-MPC); and 3) multi-medium post-sample composite (MM-MPC): a single cellulose sponge samples a single surface, and then multiple sponges are combined during sample extraction...
2016: PloS One
Lloyd Roffe, Anthony J FitzPatrick, Geoffrey W Rodgers, Tim B F Woodfield, Gary J Hooper
: Squeaking in ceramic-on-ceramic total hip arthroplasty was investigated with an acoustic monitoring device to distinguish between squeaking emanating from the Trunnion Morse Taper connection versus the articular surface. Eighty-two patients with implant problems scheduled for revision were selected and acoustic emissions with simple movements monitored. Five of these patients with ceramic-on-ceramic implants underwent surgery and their retrieved implant components were analysed in vitro...
October 13, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Abhishek Singh, Abhishek Nagpal, Salil Pawah, Chetan Pathak, Gaurav Issar, Pankaj Sharma
INTRODUCTION: In an attempt to minimize wear damage to the enamel of antagonist teeth, new low and medium fusing ceramic materials have been developed. Manufacturers usually claim that these ceramics are wear-friendly because of their lower hardness, lower concentrations of crystal phase, and smaller crystal sizes. This study aimed to quantitatively analyze the wear strength of various commercially available dental porcelain with tooth enamel as well as the surface hardness of these dental porcelain...
September 1, 2016: Journal of Contemporary Dental Practice
Antonella Antonelli, Willy A Noort, Jenny Jaques, Bauke de Boer, Regina de Jong-Korlaar, Annet Z Brouwers-Vos, Linda Lubbers-Aalders, Jeroen F van Velzen, Andries C Bloem, Huipin Yuan, Joost D de Bruijn, Gert J Ossenkoppele, Anton C M Martens, Edo Vellenga, Richard W J Groen, Jan Jacob Schuringa
In order to begin to understand mechanisms that regulate self-renewal, differentiation and transformation of human hematopoietic stem cells, or to evaluate the efficacy of novel treatment modalities, stem cells need to be studied in their own species-specific microenvironment. By implanting ceramic scaffolds coated with human mesenchymal stromal cells (MSCs) into immune deficient mice we mimic the human bone marrow niche. Thus, we have established a human leukemia xenograft mouse model in which a large cohort of patient samples successfully engrafted covering all important genetic and risk subgroups...
October 12, 2016: Blood
Cari M Pieper, Renato Fa Waldemarin, Guilherme B Camacho
This study evaluated the masking ability of two opaques applied in different thicknesses. Eighty NiCr metal discs 16 mm in diameter and 1.0 mm thick were prepared. The disks were divided into 8 groups (n = 10). Ceramic opaque in paste (groups 1 to 4) or powder (groups 5 to 8) presentations were applied. They were machined with aluminum oxide burs to the following thicknesses: G1 and G5 = 0.10 mm; G2 and G6 = 0.15 mm; G3 and G7 = 0.20 mm and G4 and G8 = 0.30 mm. Dentin ceramic 0.7 mm thick was applied over these discs, sintered and glazed according manufacturer's instructions...
September 2016: Acta Odontológica Latinoamericana: AOL
Federico Tirone, Stefano Salzano, Erik Rolando
BACKGROUND: Microdontia of the maxillary anterior teeth occurs quite frequently but is poorly documented. The literature describes several treatment choices, which are often focused on an orthodontic approach rather than a restorative one. The latest trends in restorative dentistry and the new ceramic materials, such as lithium disilicate, allow clinicians to perform esthetic rehabilitations based on microinvasive approaches that are most appropriate for younger patients. SUMMARY: Four patients, all employed in the field of dentistry, presented at our dental practice complaining of diastemata between their maxillary anterior teeth...
2016: International Journal of Esthetic Dentistry
Mario Imburgia, Angelo Canale, Davide Cortellini, Marco Maneschi, Claudio Martucci, Marco Valenti
The esthetic treatment of anterior teeth has always presented a challenge in clinical practice. With the improvement of dental materials, many restorative options such as composite resins, all-ceramic crowns, and ceramic veneers have become available. The current challenge in reconstructive dentistry is to obtain excellent esthetic results while preserving the biological structures involved as much as possible. Thanks to the introduction of high-strength etchable dental ceramics, clinicians and technicians have materials and procedures at their disposal that allow them to restore esthetics and function through a minimally invasive approach...
2016: International Journal of Esthetic Dentistry
Irena Sailer, Nikolay Alexandrovich Makarov, Daniel Stefan Thoma, Marcel Zwahlen, Bjarni Elvar Pjetursson
No abstract text is available yet for this article.
October 7, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Alexander Zill, Clarissa Precht, Benedicta Beck-Broichsitter, Susanne Sehner, Ralf Smeets, Max Heiland, Carsten Rendenbach, Anders Henningsen
PURPOSE: To report the outcome of graftless osteotome sinus floor elevation (OSFE) in order to evaluate whether apical bone gain depends on the initial residual bone height and whether the initial residual bone height has an influence on the amount of marginal bone loss. Furthermore the study aimed to assess if perforations of the Schneiderian membrane or residual bone height are potential predictors of implant survival. MATERIALS AND METHODS: In this retrospective study all patients were included who were treated between 2001 and 2010 and received dental implants in combination with OSFE in a private practice...
2016: European Journal of Oral Implantology
X P Luo, Y Yuan, Y J Shi, D D Qian
Objective: To evaluate the clinic performance of high strength glass ceramic crowns for the painful cracked teeth during a 10-year observation period. Methods: Forty-two posterior teeth from 36 patients were diagnosed as having a crack, biting painful and sensitivity to cold were selected in the Department of Prosthodontic, Institute and Hospital of Stomatology, Nanjing University Medical School. The lost-wax hot pressed glass ceramic crowns were bonded on the minimally invasive prepared teeth by modern adhesive technology...
October 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Deepanshu Srivastava, Colin Norman, Feridoon Azough, Marion C Schäfer, Emmanuel Guilmeau, Demie Kepaptsoglou, Quentin M Ramasse, Giuseppe Nicotra, Robert Freer
Ceramics based on Sr0.8La0.067Ti0.8Nb0.2O3-δ have been prepared by the mixed oxide route. The La1/3NbO3 component generates ∼13.4% A-site vacancies; this was fixed for all samples. Powders were sintered under air and reducing conditions at 1450 to 1700 K; products were of high density (>90% theoretical). Processing under reducing conditions led to the formation of a Ti1-xNbxO2-y second phase, core-shell structures and oxygen deficiency. X-ray diffraction (XRD) confirmed a simple cubic structure with space group Pm3[combining macron]m...
September 29, 2016: Physical Chemistry Chemical Physics: PCCP
Miguel A Roque, German O Gallucci, Sang J Lee
PURPOSE: To describe the occlusal pressure redistribution in dental arches following placement of single posterior implant-supported restorations in occlusion with natural dentitions. MATERIALS AND METHODS: Fifteen patients who presented for successfully osseointegrated single posterior implant restorations participated in the study. Cement-retained, all-ceramic implant crowns were fabricated and delivered after adjustment for interproximal contacts, fit, and uniform occlusal contacts...
October 5, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Maziar Montazerian, Edgar Dutra Zanotto
The global market for dental materials is predicted to exceed 10 billion dollars by 2020. The main drivers for this growth are easing the workflow of dentists and increasing the comfort of patients. Therefore, remarkable research projects have been conducted and are currently underway to develop improved or new dental materials with enhanced properties or that can be processed using advanced technologies, such as CAD/CAM or 3D printing. Among these materials, zirconia, glass or polymer-infiltrated ceramics, and glass-ceramics (GCs) are of great importance...
October 4, 2016: Journal of Biomedical Materials Research. Part A
Diego Lops, Edoardo Stellini, Luca Sbricoli, Niccolò Cea, Eugenio Romeo, Eriberto Bressan
PURPOSE: The aim of the present clinical trial was to analyze, through spectrophotometric digital technology, the influence of the abutment material on the color of the peri-implant soft tissue in patients with thin gingival biotype. MATERIAL AND METHODS: Thirty-seven patients received an endosseous dental implant in the anterior maxilla. At time of each definitive prosthesis delivery, an all-ceramic crown has been tried on gold, titanium and zirconia abutment. Peri-implant soft-tissue color has been measured through a spectrophotometer after the insertion of each single abutment...
October 3, 2016: Clinical Oral Implants Research
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