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https://www.readbyqxmd.com/read/28922616/novel-testing-for-corrosion-of-glass-ceramics-for-dental-applications
#1
J F Esquivel-Upshaw, F Ren, S M Hsu, F Y Dieng, D Neal, A E Clark
The effects of pH cycling immersion on the corrosion of glass-based ceramic materials were investigated by examining the silicon release level in the immersion solution and the surface morphology of the ceramic after immersion. The hypothesis that pH cycling causes more surface degradation than constant immersion was tested. An inductively coupled plasma atomic emission spectrometer was used for Si ion concentration determination and scanning electron microscopy for surface morphology analyses. Two pH cycling sequences (pH 2, 7, 10 and pH 10, 2, 7) were employed in this study...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28920187/sub-ablative-er-cr-ysgg-laser-irradiation-under-all-ceramic-restorations-effects-on-demineralization-and-shear-bond-strength
#2
Serdar Bağlar
This study evaluated the caries resistant effects of sub-ablative Er,Cr:YSGG laser irradiation alone and combined with fluoride in comparison with fluoride application alone on enamel prepared for veneer restorations. And also, evaluated these treatments' effects on the shear bond strength of all-ceramic veneer restorations. One hundred and thirty-five human maxillary central teeth were assigned to groups of 1a-control, 1b-laser treated, 1c-fluoride treated, 1d-laser + fluoride treated for shear bond testing and to groups of 2a-positive control(non-demineralised), 2b-laser treated, 2c-fluoride treated, 2d-laser + fluoride treated, 2e-negative control (demineralised) for microhardness testing (n = 15, N = 135)...
September 17, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28918009/low-temperature-degradation-of-single-layers-of-multilayered-zirconia-in-comparison-to-conventional-unshaded-zirconia-phase-transformation-and-flexural-strength
#3
Sebastian Wille, Paul Zumstrull, Victor Kaidas, Lea Katharina Jessen, Matthias Kern
OBJECTIVES: The aim of this study was to evaluate the transformation of yttrium stabilized tetragonal zirconia (Y-TZP) to monoclinic phase and its change in flexural strength of the various layers of multilayered zirconia (enamel layer, transition layer 1, transition layer 2 and body layer) in comparison to two conventional zirconia ceramics. Additionally, the ball-on-three-balls test was compared with a conventional biaxial flexural strength test. METHODS: The crystallographic structure of the four layers of Katana Zirconia ML (Kuraray), e...
September 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28917199/enhanced-phosphorus-and-ciprofloxacin-removal-in-a-modified-baf-system-by-configuring-fe-c-micro-electrolysis-investigation-on-pollutants-removal-and-degradation-mechanisms
#4
Longlong Zhang, Qinyan Yue, Kunlun Yang, Pin Zhao, Baoyu Gao
A modified biological aerated filter (BAF) system configured Fe-C micro electrolysis was applied to enhance phosphorus and ciprofloxacin (CIP) removal. A novel sludge ceramic and sintering ferric-carbon ceramic (SFC) were separately packed into a lab-scale BAF and Fe-C micro electrolysis reactor. The BAF and Fe-C micro electrolysis coupled system was operated about 230days. The enhancement of phosphorus and ciprofloxacin removals by Fe-C micro electrolysis, the degradation mechanisms of CIP and the variations of microbial population were investigated...
September 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28915728/atomic-level-simulation-study-of-n-hexane-pyrolysis-on-silicon-carbide-surfaces
#5
Md Symon Jahan Sajib, Mohammadreza Samieegohar, Tao Wei, Katherine Shing
Ethylene production plays a key role in the petrochemical industry. The severe operation conditions of ethylene thermal cracking, such as high-temperature and coke-formation, pose challenges for the development of new corrosion-resistant and coking-resistant materials for ethylene reactor radiant coils tubes (RCTs). We investigated the performance of ceramic materials such as silicon carbide (SiC) in severe pyrolysis conditions by using reactive forcefield molecular dynamics (ReaxFF MD) simulation method. Our results indicate that β-SiC surface remains fully stable at 1500 K, whereas increased temperature results in melted interface...
September 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28913890/interfacial-fracture-toughness-of-adhesive-resin-cement-lithium-disilicate-resin-composite-blocks
#6
Samer Mesmar, N Dorin Ruse
PURPOSE: Resin composite blocks (RCB) are advocated as alternative to ceramic blocks (CB). Prior to use, adherence to these materials should characterized. This study aimed to test the null hypothesis (H0 ) that material and surface treatment combinations do not influence interfacial fracture toughness (KIC ) of a self-cured adhesive resin cement [RelyX Ultimate (RXU)] to RCB or CB, under nonaged and aged conditions. MATERIALS AND METHODS: Two RCB, Lava Ultimate (LU) and Enamic (EN), and one CB, IPS e...
September 15, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28913402/midterm-analysis-of-the-selexys-cup-with-ceramic-inlay
#7
Tamas Halasi, David Kieser, Christopher M A Frampton, Gary J Hooper
BACKGROUND: Ceramic-on-ceramic (CoC) articulations in total hip replacement (THR) has been accepted as giving reliable mid-term results; however recent studies have reported higher revision rates of some implants. This study analyses the nationwide results of the seleXys TPS cup and the Bionit2 liner (Mathys, Bettlach, Switzerland) with respect to implant survival, cause for revision and mortality rates compared to other CoC articulations using the same stem. METHODS: Utilising the New Zealand Joint Registry, we compared the seleXys TPS cup with Bionit2 liner used with an uncemented Twinsys femoral stem to every other uncemented CoC THR using the same stem...
September 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/28912939/effect-of-er-yag-laser-and-sandblasting-in-recycling-of-ceramic-brackets
#8
Soghra Yassaei, Hossein Aghili, Azadeh Hosseinzadeh Firouzabadi, Hamidreza Meshkani
Introduction: This study was performed to determine the shear bond strength of rebonded mechanically retentive ceramic brackets after recycling with Erbium-Doped Yttrium Aluminum Garnet (Er:YAG) laser or sandblasting. Methods: Twenty-eight debonded ceramic brackets plus 14 intact new ceramic brackets were used in this study. Debonded brackets were randomly divided into 2 groups of 14. One group was treated by Er:YAG laser and the other with sandblasting. All the specimens were randomly bonded to 42 intact human upper premolars...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/28912814/effect-of-antioxidant-water-on-the-bioactivities-of-cells
#9
Seong Gu Hwang, Ho-Sung Lee, Byung-Cheon Lee, GunWoong Bahng
It has been reported that water at the interface of a hydrophilic thin film forms an exclusion zone, which has a higher density than ordinary water. A similar phenomenon was observed for a hydrated hydrophilic ceramic powder, and water turns into a three-dimensional cell-like structure composed of high density water and low density water. This structured water appears to have a stimulative effect on plant growth. This report outlines our study of antioxidant properties of this structured water and its effect on cell bioactivities...
2017: International Journal of Cell Biology
https://www.readbyqxmd.com/read/28910712/raman-analysis-of-cobalt-blue-pigment-in-blue-and-white-porcelain-a-reassessment
#10
Xiaochenyang Jiang, Yanying Ma, Yue Chen, Yuanqiu Li, Qinglin Ma, Zhaoxia Zhang, Changsui Wang, Yimin Yang
Cobalt blue is a famous pigment in human history. In the past decade it is widely reported that the cobalt aluminate has been detected in ancient ceramics as blue colorant in glaze, yet the acquired Raman spectra are incredibly different from that of synthesised references, necessitating a reassessment of such contradictory scenario with more accurate analytic strategies. In this study, micro-Raman spectroscopy (MRS) and scanning electron microscopy (SEM) in association with energy dispersive spectrometry (EDS) were performed on under-glaze cobalt pigments from one submerged blue and white porcelain shard dated from Wanli reign (1573-1620CE) of Ming dynasty (1365-1644CE) excavated at Nan'ao I shipwreck off the southern coast of China...
September 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28910363/impaired-bone-formation-in-ovariectomized-mice-reduces-implant-integration-as-indicated-by-longitudinal-in-vivo-micro-computed-tomography
#11
Zihui Li, Gisela Kuhn, Michael Schirmer, Ralph Müller, Davide Ruffoni
Although osteoporotic bone, with low bone mass and deteriorated bone architecture, provides a less favorable mechanical environment than healthy bone for implant fixation, there is no general agreement on the impact of osteoporosis on peri-implant bone (re)modeling, which is ultimately responsible for the long term stability of the bone-implant system. Here, we inserted an implant in a mouse model mimicking estrogen deficiency-induced bone loss and we monitored with longitudinal in vivo micro-computed tomography the spatio-temporal changes in bone (re)modeling and architecture, considering the separate contributions of trabecular, endocortical and periosteal surfaces...
2017: PloS One
https://www.readbyqxmd.com/read/28906507/influence-of-the-diameter-of-dental-implants-replacing-single-molars-3-to-6-year-follow-up
#12
Jose Alfredo Mendonça, Plinio Mendes Senna, Carlos Eduardo Francischone, Carlos Eduardo Francischone Junior, Bruno Salles Sotto-Maior
PURPOSE: The aim of this study was to evaluate the influence of the implant diameter on marginal bone remodeling around dental implants replacing single molars after a follow-up period of 3 to 6 years. MATERIALS AND METHODS: Patients who received dental implants with an external hexagon platform in healed sites to support a single metal-ceramic crown in the molar region were recalled to the office. The implantation sites and implant length information were recorded, and the implants were divided according to the implant diameter: regular (RP) or wide (WP)...
September 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28906500/fracture-of-reduced-diameter-zirconia-dental-implants-following-repeated-insertion
#13
Matthias Karl, Stefan Scherg, Tanja Grobecker-Karl
PURPOSE: Achievement of high insertion torque values indicating good primary stability is a goal during dental implant placement. The objective of this study was to evaluate whether or not two-piece implants made from zirconia ceramic may be damaged as a result of torque application. MATERIALS AND METHODS: A total of 10 two-piece zirconia implants were repeatedly inserted into polyurethane foam material with increasing density and decreasing osteotomy size. The insertion torque applied was measured, and implants were checked for fractures by applying the fluorescent penetrant method...
September 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28902420/one-piece-zirconia-oral-implants-for-single-tooth-replacement-three-year-results-from-a-long-term-prospective-cohort-study
#14
Ralf-Joachim Kohal, Benedikt Christopher Spies, Annalena Bauer, Frank Butz
AIM: This 3-year report of a prospective long-term cohort investigation aimed to evaluate the clinical and radiographic outcomes of a one-piece zirconia oral implant for single tooth replacement. MATERIALS AND METHODS: 65 patients received a 1-stage implant surgery with immediate temporization. Standardized radiographs were taken at implant insertion, after 1 year, and after 3 years to monitor peri-implant bone levels. A univariate analysis of the association of different baseline parameters on marginal bone loss from implant insertion to 36 months was performed...
September 13, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28902309/-lead-poisoning-and-marginalization-in-newborns-of-morelos-mexico
#15
Martha María Téllez-Rojo, Luis F Bautista-Arredondo, Vesta Richardson, Daniel Estrada-Sánchez, Laura Ávila-Jiménez, Camilo Ríos, Alejandra Cantoral-Preciado, Martín Romero-Martínez, Delia Flores-Pimentel, María Del Carmen Melo-Zurita, Anita Romero-Ramírez, Marco Antonio León-Mazón, Sergio Montes, Richard Fuller, Mauricio Hernández-Ávila
Objective: To determine the prevalence of lead (Pb) poisoning at birth in Morelos, analyze its distribution by social marginalization level, and estimate the association with the use of lead glazed ceramics (LGC). Materials and methods: Blood lead level (BLL) in umbilical cord was measured in a representative sample of 300 randomly selected births at the Morelos Health Services and state IMSS. Results: The prevalence of Pb poisoning at birth (BLL> 5μg/dL) was 14...
May 2017: Salud Pública de México
https://www.readbyqxmd.com/read/28902242/polymerization-shrinkage-stress-of-composite-resins-and-resin-cements-what-do-we-need-to-know
#16
Carlos José Soares, André Luis Faria-E-Silva, Monise de Paula Rodrigues, Andomar Bruno Fernandes Vilela, Carmem Silvia Pfeifer, Daranee Tantbirojn, Antheunis Versluis
Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth, shrinkage stress has been associated with post-operative sensitivity and marginal stain. The latter is often erroneously used as a criterion for replacement of composite restorations...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902238/dental-ceramics-a-review-of-new-materials-and-processing-methods
#17
Lucas Hian da Silva, Erick de Lima, Ranulfo Benedito de Paula Miranda, Stéphanie Soares Favero, Ulrich Lohbauer, Paulo Francisco Cesar
The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28901753/synthesis-of-a-cu-filled-rh17s15-framework-microwave-polyol-process-versus-high-temperature-route
#18
Maria Roslova, Pavlo Golub, Lars Opherden, Alexander Ovchinnikov, Marc Uhlarz, Alexey I Baranov, Yurii Prots, Anna Isaeva, Mauro Coduri, Thomas Herrmannsdörfer, Joachim Wosnitza, Thomas Doert, Michael Ruck
Metal-rich, mixed copper-rhodium sulfide Cu3-δRh34S30 that represents a new Cu-filled variant of the Rh17S15 structure has been synthesized and structurally characterized. Copper content in the [CuRh8] cubic cluster was found to vary notably dependent on the chosen synthetic route. Full site occupancy was achieved only in nanoscaled Cu3Rh34S30 obtained by a rapid, microwave-assisted reaction of CuCl, Rh2(CH3CO2)4 and thiosemicarbazide at 300 °C in just 30 min; whereas merely Cu-deficient Cu3-δRh34S30 (2...
September 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28901135/room-temperature-large-and-reversible-modulation-of-photoluminescence-by-in-situ-electric-field-in-ergodic-relaxor-ferroelectrics
#19
Hailing Sun, Xiao Wu, Dengfeng Peng, K W Kwok
Ferroelectric oxides with luminescent ions hold great promise in future optoelectronic devices because of their unique photoluminescence and inherent ferroelectric properties. Intriguingly, the photoluminescence performance of ferroelectric ceramics could be modulated by an external electric field. However, researchers face a current challenge of the diminutive extent and degree of reversibility of the field-driven modification that hinder their use in room temperature practical applications. Within the scope of current contribution in rare-earth doped bismuth sodium titanate relaxors, the most important information to be noted is the shifting of the depolarization temperature towards room temperature and the resulting considerable enhancement in ergodicity, as evidenced by the dielectric properties, polarization and strain hysteresis, as well as the in-situ Raman/ X-ray diffraction studies...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28900517/bone-inspired-spatially-specific-piezoelectricity-induces-bone-regeneration
#20
Peng Yu, Chengyun Ning, Yu Zhang, Guoxin Tan, Zefeng Lin, Shaoxiang Liu, Xiaolan Wang, Haoqi Yang, Kang Li, Xin Yi, Ye Zhu, Chuanbin Mao
The extracellular matrix of bone can be pictured as a material made of parallel interspersed domains of fibrous piezoelectric collagenous materials and non-piezoelectric non-collagenous materials. To mimic this feature for enhanced bone regeneration, a material made of two parallel interspersed domains, with higher and lower piezoelectricity, respectively, is constructed to form microscale piezoelectric zones (MPZs). The MPZs are produced using a versatile and effective laser-irradiation technique in which K0...
2017: Theranostics
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