2,612 results match your criteria Hydrofluoric Acid Burns


Adhesion to a Lithium Disilicate Glass Ceramic Etched with Hydrofluoric Acid at Distinct Concentrations.

Braz Dent J 2018 Sep-Oct;29(5):492-499

Post-Graduate Program in Oral Science (Prosthodontics Unit), Dental School, UFSM - Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.

This study evaluated the effect of different hydrofluoric acid (HF) concentrations on the bond strength between a lithium disilicate-based glass ceramic and a resin cement. Eighty ceramic-blocks (12×7×2 mm) of IPS e.Max CAD (Ivoclar Vivadent) were produced and randomly assigned to 8 groups, considering 2 study factors: HF concentration in 4 levels, i. Read More

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January 2018
2 Reads

Impact of Recently Developed Universal Adhesives on Tensile Bond Strength to Computer-Aided Design/Manufacturing Ceramics.

Oper Dent 2018 Dec 5. Epub 2018 Dec 5.

Objectives:: The aim of this investigation was to test the tensile bond strength (TBS) between different computer-aided-design/manufacturing (CAD/CAM) ceramics after conditioning using different universal adhesive systems and resin composite cement.

Methods And Materials:: Substrates of four CAD/CAM ceramics-1) VITABLOCS Mark II, 2) Initial LRF, 3) Celtra Duo, and 4) IPS e.max CAD (N=648, n=162)-were fabricated. Read More

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December 2018
2 Reads

Bonding Strength of a Glass Microfluidic Device Fabricated by Femtosecond Laser Micromachining and Direct Welding.

Micromachines (Basel) 2018 Dec 3;9(12). Epub 2018 Dec 3.

Department of Electronics and Control Engineering, Hanbat National University, Daejeon 34158, Korea.

We present a rapid and highly reliable glass (fused silica) microfluidic device fabrication process using various laser processes, including maskless microchannel formation and packaging. Femtosecond laser assisted selective etching was adopted to pattern microfluidic channels on a glass substrate and direct welding was applied for local melting of the glass interface in the vicinity of the microchannels. To pattern channels, a pulse energy of 10 μJ was used with a scanning speed of 100 mm/s at a pulse repetition rate of 500 kHz. Read More

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December 2018

Bond strength between composite repair and polymer-infiltrated ceramic-network material: Effect of different surface treatments.

J Esthet Restor Dent 2018 Dec 3. Epub 2018 Dec 3.

Post-Graduation Program in Dentistry, Dental School, University of Passo Fundo, Passo Fundo, Brazil.

Objective: To evaluate the bond strength of a polymer-infiltrated ceramic-network (PICN) material and to composite repair after different surface treatments.

Materials And Methods: Eighteen blocks of the PICN material were obtained from CAD/CAM blocks, aged and randomly divided into 2 groups: 5% hydrofluoric acid (HF) or sandblasting with aluminum oxide particles (SAND). For each condition, three treatments were tested: silane (Sil), silane-containing adhesive (Ad), or silane + silane-containing adhesive (SilAd). Read More

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December 2018
2 Reads

Volar Resurfacing of the Thumb with a Superficial Circumflex Iliac Artery Perforator Flap after Hydrofluoric Acid Burn.

J Hand Microsurg 2018 Dec 5;10(3):162-165. Epub 2018 Apr 5.

Division of Plastic Surgery, University of Colorado, Aurora, Colorado, United States.

A right-hand-dominant 55-year-old male automotive mechanic presented 24 hours following a hydrofluoric acid burn to the volar left thumb. Despite the severity of soft tissue injury, the neurovascular bundles were intact. Although a free toe-pulp flap is often described to cover volar digit defects, the resultant 6- × 4-cm full-thickness injury of the thumb was too large to be adequately covered by a toe-pulp flap or other commonly used local flaps from the ipsilateral hand. Read More

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December 2018

Influence of glass-ceramic coating on composite zirconia bonding and its characterization.

Dent Mater 2018 Nov 24. Epub 2018 Nov 24.

Department of Prosthodontics, Sydney Dental School, Faculty of Medicine and Health, The University of Sydney, Westmead, NSW, 2145, Australia.

Objective: The aims of this study were to compare micro-tensile bond strength and characterize the bond of ceramic-coated versus air-abraded and chemically treated zirconia specimens.

Methods: Eight zirconia blocks were fabricated and assigned to two groups as follows: AA-alumina air-abrasion; and CC-DCMhotbond coating followed by alumina air-abrasion and hydrofluoric acid etching. For each group, two identically pre-treated zirconia blocks were applied G-Multi Primer, cemented together with G-Cem Linkforce cement and cut into 30 stick-shaped specimens (1×1×9mm). Read More

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November 2018
1 Read

Adsorptive removal of resorcinol on a novel ordered mesoporous carbon (OMC) employing COK-19 silica scaffold: Kinetics and equilibrium study.

J Environ Sci (China) 2019 Jan 21;75:307-317. Epub 2018 Apr 21.

Department of Civil Engineering, University of Louisiana at Lafayette, LA 70504, USA; Center for Environmental Technology, The Energy Institute of Louisiana, LA 70504, USA. Electronic address:

Phenolic compounds and their derivatives have been found in industrial wastewater, which pose threats to the natural environment. Ordered mesoporous carbon (OMC) has been identified as an ideal adsorbent possessing high specific surface area and large pore volume to alleviate these pollutants. A novel ordered mesoporous carbon was prepared using COK-19 template with the cubic Fm3m structure for the first time. Read More

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January 2019
2 Reads

Fabrication of 4 × 1 signal combiner for high-power lasers using hydrofluoric acid.

Opt Express 2018 Nov;26(23):30667-30677

We report a new method to fabricate a 4 × 1 signal combiner that comprises an output fiber port and a tapered fused bundle (TFB) with four input fiber ports. The TFB is etched in a solution of hydrofluoric acid and spliced with an output fiber of core diameter 105 μm and cladding diameter 125 μm. Each cladding of the four input optical fiber is etched to approximately 72. Read More

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November 2018
1 Read

Optimisation of ultrafast laser assisted etching in fused silica.

Opt Express 2018 Sep;26(19):24343-24356

Ultrafast laser assisted etching (ULAE) in fused silica is an attractive technology for fabricating three-dimensional micro-components. ULAE is a two-step process whereby ultrafast laser inscription (ULI) is first used to modify the substrate material and chemical etching is then used to remove the laser modified material. In this paper, we present a detailed investigation into how the ULI parameters affect the etching rate of laser modified channels and planar surfaces written in fused silica. Read More

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September 2018

Molecularly imprinted photonic hydrogel sensor for optical detection of L-histidine.

Mikrochim Acta 2018 Nov 21;185(12):557. Epub 2018 Nov 21.

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China.

A molecularly imprinted photonic hydrogel (MIPH) is described for the optical determination of L-histidine (L-His). The inverse opal structure of MIPH was obtained by placing silica particles (230 nm) in molecularly imprinted polymer on a glass slide. After being fully etched by hydrofluoric acid, this inverse opal structure brings about a high specific surface and plentiful binding sites for L-His. Read More

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November 2018
11 Reads

Atmospheric Decomposition of Trifluoromethanol Catalyzed by Formic Acid.

J Phys Chem A 2018 Nov 29. Epub 2018 Nov 29.

Department of Chemistry and Biochemistry , University of California-San Diego , La Jolla , California 92093 , United States.

Quantum chemistry calculations are used to investigate the energetics and kinetics of CFOH decomposition catalyzed by a single formic acid (FA) molecule acting alone and in conjunction with a single water (HO) molecule to form the products carbonyl fluoride (CFO) and hydrofluoric acid (HF). While the uncatalyzed reaction has a barrier of ∼44.7 kcal/mol, the presence of a FA molecule reduces the barrier to 6. Read More

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November 2018
2 Reads

Ultrasensitive 2D Bi O Se Phototransistors on Silicon Substrates.

Adv Mater 2018 Nov 12:e1804945. Epub 2018 Nov 12.

School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.

2D materials are considered as intriguing building blocks for next-generation optoelectronic devices. However, their photoresponse performance still needs to be improved for practical applications. Here, ultrasensitive 2D phototransistors are reported employing chemical vapor deposition (CVD)-grown 2D Bi O Se transferred onto silicon substrates with a noncorrosive transfer method. Read More

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November 2018

Rational treatment of hydrofluoric acid burns of the fingers.

Burns 2018 Oct 30. Epub 2018 Oct 30.

Department of Burns & Wound Care Center, 2nd Affiliated Hospital of Zhejiang University, College of Medicine, Hangzhou 310009, China. Electronic address:

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October 2018

Effect of airborne-particle abrasion and, acid and alkaline treatments on shear bond strength of dental zirconia.

Dent Mater J 2018 Nov 1. Epub 2018 Nov 1.

Research Center for Sustainable Chemistry Autonomus University of Mexico State.

The surface roughness, morphology and shear bond strength (SBS) of dental zirconia using three different surface treatment techniques were evaluated. Three groups of sintered zirconia blocks were treated as follow, 1) Airborne-particle abrasion (APA) group (G1-APA), 50-µm Al2O3; 2) APA and 9% hydrofluoric acid etching (G2-HF); 3) APA and Sodium Hydroxide (G3-NaOH). The specimens were evaluated for roughness [atomic force microscope (AFM)], morphology [Scanning Electron Microscope (SEM)] and for SBS in the universal testing machine. Read More

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November 2018

Influence of cleaning methods on bond strength to saliva contaminated zirconia.

J Esthet Restor Dent 2018 Oct 30. Epub 2018 Oct 30.

Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.

Objective: To evaluate the influence of saliva contamination and cleaning procedures on shear bond strength (SBS) of a self-adhesive resin cement (SAC) to zirconia surfaces.

Materials And Methods: A total of 160 sandblasted zirconia blocks were randomly divided into eight groups as follows: No saliva contamination, no cleansing (NC-NC); contamination with saliva, no cleansing (SC-NC); no saliva contamination, cleansing with a zirconia primer (ZP; Z-Bond, Danville Materials, Inc., S. Read More

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October 2018

Effect of mixing two environmental stressors, pH and metal contaminants, on offspring of rats exposed during gestation and lactation.

Environ Sci Pollut Res Int 2018 Dec 23;25(35):35555-35561. Epub 2018 Oct 23.

Laboratório de Ensaios Farmacológicos e Toxicológicos - LEFT, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande do Sul - FURG, Av. Itália, km 8, Campus Carreiros, Rio Grande, RS, CEP 96203-900, Brazil.

In large urban centers, the toxicity of metal mixtures may be enhanced by physicochemical factors and environmental variables, including pH. Rio Grande, a municipality located in the extreme south of Brazil, has soils with high levels of contamination due to urban and industrial activities and a high prevalence of acid rain events. Previous studies have shown that contact with elutriate of these soils can cause physiological and reproductive changes. Read More

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December 2018
2 Reads

Trap Passivation in Indium-Based Quantum Dots through Surface Fluorination: Mechanism and Applications.

ACS Nano 2018 Nov 18;12(11):11529-11540. Epub 2018 Oct 18.

Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , United States.

Treatment of InP colloidal quantum dots (QDs) with hydrofluoric acid (HF) has been an effective method to improve their photoluminescence quantum yield (PLQY) without growing a shell. Previous work has shown that this can occur through the dissolution of the fluorinated phosphorus and subsequent passivation of indium on the reconstructed surface by excess ligands. In this article, we demonstrate that very significant luminescence enhancements occur at lower HF exposure though a different mechanism. Read More

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November 2018
9 Reads

Shear bond strength of metal brackets to ceramic surfaces using a universal bonding resin.

J Clin Exp Dent 2018 Aug 1;10(8):e739-e745. Epub 2018 Aug 1.

Assistant Professor, Department of Orthodontics, Lorestan University of Medical Sciences, Khorramabad, Iran.

Background: Assure Plus is a recently introduced universal adhesive with the ability to bond to various restorations. This study compared the shear bond strength of brackets bonded to two types of ceramics using conventional bonding agent and Assure Plus. Surface damage caused by debonding was also evaluated. Read More

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August 2018
1 Read

Effects of different etching strategies on the microtensile repair bond strength of beautifil II giomer material.

J Clin Exp Dent 2018 Aug 1;10(8):e732-e738. Epub 2018 Aug 1.

Professor, Department of Polymer Engineering, Polymer Engineering Faculty, Sahand University of Technology, Tabriz, Iran.

Background: Considering the differences in the filler particles between giomer and conventional composite resins and the importance of these fillers in the repair bond strength, the aim was to evaluate the effects of different etching strategies with phosphoric acid (PA) and hydrofluoric acid (HF) on the microtensile repair bond strength (µTRBS) of giomer.

Material And Methods: Ten giomer blocks were randomly assigned into 10: 1) control; 2) 37%PA-20s; 3) 3%HF-20s; 4) 3%HF-120s; 5) 9.6%HF-20s; 6) 9. Read More

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August 2018
2 Reads

Sequential coprecipitation and matrix removal for determination of cadmium impurities from multivitamin supplements by inductively coupled plasma mass spectrometry and method validation by isotope dilution analysis of SRM 3280 multivitamin/multielement tablets.

Microchem J 2018 Jun 4;139:242-249. Epub 2018 Mar 4.

Jackson State University, Department of Chemistry, Physics and Atmospheric Sciences, Jackson, MS 39217 USA.

In this paper, we examined three different sequential coprecipitation schemes based on Mg(OH) and CaF precipitation using triethylamine (TEA) and hydrofluoric acid (HF), respectively, for determination of cadmium (Cd) impurities from multivitamin/mineral (MVM) supplements by isotope dilution (ID) inductively coupled plasma mass spectrometry (ICP-MS). The schemes involved three-step coprecipitation with either TEA alone or in combination with HF and are designated as Scheme 1 (TEA-TEA-TEA), Scheme 2 (TEA-HF-TEA) and Scheme 3 (HF-TEA-TEA) according to the addition sequence of each reagent. Experiments were carried out with MVM solutions spiked with 60 μg L Cd from a multielement standard solution. Read More

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Bonding Strength of Orthodontic Brackets on Porcelain Surfaces Etched by Er:YAG Laser.

Photomed Laser Surg 2018 Nov 18;36(11):601-607. Epub 2018 Sep 18.

1 Department of Stomatology, Beijing Friendship Hospital, Capital Medical University , Beijing, China .

Objective: To evaluate the effect of erbium: yttrium aluminium garnet laser conditioning bond strength of orthodontic brackets on porcelain surfaces.

Background: There are few studies that evaluate the effect of Er:YAG laser about orthodontic bonding on porcelain surface. The efficacy of Er:YAG laser in porcelain conditioning is controversial. Read More

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November 2018
8 Reads

Shear Bond Strength of Different CAD/CAM Ceramics: Acid vs Er:YAG Laser Etching.

Photomed Laser Surg 2018 Nov 18;36(11):614-620. Epub 2018 Sep 18.

4 Key Laboratory of Oral Medicine, Guangzhou Institute of Oral Disease, Stomatology Hospital of Guangzhou Medical University , Guangzhou, China .

Objective: To evaluate whether Er:YAG laser etching could be an alternative surface treatment to hydrofluoric (HF) acid etching.

Background: Surface treatment is important to bonding properties and utility times of computer aided design/computer aided manufacture (CAD/CAM) dental ceramics. The traditional method of HF acid etching is harmful to humans if not handled properly. Read More

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November 2018
1 Read

Does Luting Strategy Affect the Fatigue Behavior of Bonded Y-TZP Ceramic?

J Adhes Dent 2018 ;20(4):307-315

Purpose: To evaluate the effect of different luting strategies on the fatigue failure load (FFL) and stress distribution of Y-TZP disks luted to epoxy resin substrate.

Materials And Methods: Y-TZP disks (diameter = 10 mm; thickness = 0.7 mm) were assigned to five groups according to the luting strategy (n = 15): CC: no zirconia surface treatment, composite cement; G_CC: application of a thin glaze layer on zirconia followed by hydrofluoric acid etching and silanization, composite cement; Al_CC: air abrasion of the zirconia surface with 125-µm Al2O3 particles, composite cement; Si_CC: tribochemical silica coating (30-µm SiO2 particles), composite cement; ZP: air abrasion of the zirconia surface with 125-µm Al2O3 particles, zinc-phosphate cement. Read More

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January 2018

Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al₂O₃-SiO₂ Glass-Ceramic.

Materials (Basel) 2018 Sep 6;11(9). Epub 2018 Sep 6.

State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China.

The present study focuses on the etching conditions and mechanism of MgO-Al₂O₃-SiO₂ glass-ceramic (MAS) in hydrofluoric acid (HF). The results show that the amorphous phase has 218 times higher etching rate than pure cordierite crystal at room temperature. In addition, the activation energies of cordierite and amorphous phases in the HF solution are 52. Read More

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September 2018
3 Reads
2.650 Impact Factor

Repair of aged bulk-fill composite with posterior composite: Effect of different surface treatments.

J Esthet Restor Dent 2018 Sep 8. Epub 2018 Sep 8.

Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karadeniz Technical University, Turkey.

Objective: In the present study, the ability of posterior resin composite to repair aged bulk-fill resin composite and vice versa were assessed by shear bond strength testing.

Materials And Methods: Resin composite substrates were aged and surfaces were abraded with abrasive papers, then bulk-fill substrates were repaired with posterior resin composite and vice versa using different surface treatments (no surface treatment [control]; etching with 37% phosphoric acid [H PO ] for 20 seconds; etching with 10% hydrofluoric acid [HF] for 20 seconds; etching with 37% H PO for 20 seconds + adhesive application; etching with 10% HF for 20 seconds + adhesive application; adhesive application only). Shear bond strengths (SBS) were then measured and surface roughness values (Ra) were determined. Read More

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September 2018
17 Reads

Bond strength of resin cement to ceramic with simplified primers and pretreatment solutions.

Gen Dent 2018 Sep-Oct;66(5):33-37

Manufacturers have recently introduced surface primers and pretreatment solutions that reportedly simplify the bonding process of resin cements to ceramics through various combinations of etchant and coupling agents. This study evaluated the shear bond strength (SBS) of a resin cement to a lithium disilicate glass-ceramic material pretreated with various new surface treatment solutions and compared the results to those of a control group prepared with the traditional application of hydrofluoric acid (HF) and silane. Resin cement was bonded to pretreated glass-ceramic surfaces, and specimens were tested for SBS after 24 hours of storage in water. Read More

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September 2018

Antibacterial activities and biocompatibilities of Ti-Ag alloys prepared by spark plasma sintering and acid etching.

Mater Sci Eng C Mater Biol Appl 2018 Nov 12;92:121-131. Epub 2018 Jun 12.

Department of Orthopedics and Sports Medicine and Joint Surgery, The People's Hospital of China Medical University, Shenyang, People's Republic of China. Electronic address:

In this work, Ti-Ag sintered alloys (Ti-Ag) with different Ag contents were prepared by a spark plasma sintering (SPS) technique, which is a new, efficient and convenient method of powder metallurgy. The Ti-Ag samples were then treated with a mixture of 40 wt% hydrofluoric acid (HF) and nitric acid (HNO). The surface features, ion release, antibacterial activities and biocompatibilities of the acid-etched Ti-Ag (Ti-Ag(AE)) samples were systematically characterized. Read More

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November 2018
1 Read

Clinical significance of urinary fluoride levels in patients with hydrofluoric acid burns.

Burns 2018 Aug 28. Epub 2018 Aug 28.

Department of Burns & Wound Care Centre, 2nd Affiliated Hospital of Zhejiang University, College of Medicine, Hangzhou 310009, China. Electronic address:

Objective: We investigated the urinary fluoride level in patients with hydrofluoric acid (HF) burns of different severities and explored the clinical significance of these levels in the diagnosis of acute HF burn.

Methods: Data from 260 patients with HF burns were collected from the Department of Burns, Zhejiang Quhua Hospital, between July 2006 and June 2016. According to burn severity, patients were divided into non-poisoning, mild poisoning, moderate poisoning, and severe poisoning groups. Read More

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Femtosecond-Pulsed Laser Written and Etched Fiber Bragg Gratings for Fiber-Optical Biosensing.

Sensors (Basel) 2018 Aug 28;18(9). Epub 2018 Aug 28.

Department of Physical Chemistry/Applied Laser Sensing in Complex Biosystems (ALS ComBi), University of Potsdam, 14476 Potsdam, Germany.

We present the development of a label-free, highly sensitive fiber-optical biosensor for online detection and quantification of biomolecules. Here, the advantages of etched fiber Bragg gratings (eFBG) were used, since they induce a narrowband Bragg wavelength peak in the reflection operation mode. The gratings were fabricated point-by-point via a nonlinear absorption process of a highly focused femtosecond-pulsed laser, without the need of prior coating removal or specific fiber doping. Read More

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August 2018
1 Read

Laboratory Study of Micro-shear Bond Strength of Two Resin Cements to Leucite Ceramics using Different Ceramic Primers.

J Contemp Dent Pract 2018 Aug 1;19(8):918-924. Epub 2018 Aug 1.

Department of Fixed Prosthodontics, Umm Al-Qura University Makkah, Kingdom of Saudi Arabia.

Aim: To evaluate the effect of Monobond Etch & Prime on the micro-shear bond strength (MSBS) of resin cements to leucite surface and to compare the MSBS of two different resin cements to conditioned leucite surfaces with different primer systems.

Materials And Methods: Twenty-one leucite ceramic disks (10 mm diameter, 2 mm thickness) were divided into three groups (n = 7). Group I: 9. Read More

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August 2018
4 Reads

Calcium gluconate alleviates the toxic effect of hydrofluoric acid on human dermal fibroblasts through the Wnt/β-catenin pathway.

Oncol Lett 2018 Sep 18;16(3):2921-2928. Epub 2018 Jun 18.

Department of Urological Surgery, Shiyan People's Hospital, People's Hospital Affiliated to Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China.

The present study was performed to determine the molecular mechanism of calcium gluconate (CG) in alleviating the toxic effect of hydrofluoric (HF) acid on human dermal fibroblasts (HDFs). HDF morphology was observed by optical microscopy and the vimentin immunofluorescence assay. Cell viability and apoptosis were evaluated by the Cell Counting Kit-8 and Annexin V/propidium iodide assays, respectively. Read More

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September 2018
0.990 Impact Factor

Psychometric properties of the 10-item Conner-Davidson resilience scale on toxic chemical-exposed workers in South Korea.

Ann Occup Environ Med 2018 13;30:52. Epub 2018 Aug 13.

5Department of Occupational Medicine, Dankook University Cheonan Hospital, Cheonan-si, Chungnam Republic of Korea.

Background: Resilient individuals have a comprehensive ability to adapt to various life circumstances. Psychological resilience predicts an individual's physiological response to stress. The 10-item Connor-Davidson Resilience Scale (CD-RISC) is a widely used measure to quantify the level of self-perceived resilience. Read More

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Bond strength of composite resin to white mineral trioxide aggregate: Effect of different surface treatments.

J Conserv Dent 2018 Jul-Aug;21(4):350-353

Dental Materials Research Center and Department of Operative Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.

Background: The main aim of restorative dentistry is to restore and preserve dental health with the use of appropriate restorative modalities to protect the pulp and restore its function. This study compared the effect of different surface treatments of mineral trioxide aggregate (MTA) on the bond strength of composite resin to MTA.

Materials And Methods: Forty cylindrical acrylic blocks with a hole were prepared and filled by ProRoot MTA. Read More

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August 2018
8 Reads

A hollow microporous organic network as a fiber coating for solid-phase microextraction of short-chain chlorinated hydrocarbons.

Mikrochim Acta 2018 Aug 17;185(9):416. Epub 2018 Aug 17.

Key Laboratory for Applied Technology of Sophisticated Analytical Instruments, Shandong Analysis and Test Centre, Qilu University of Technology (Shandong Academy of Sciences), Shandong, Jinan, People's Republic of China, 250014.

A solid-phase microextraction (SPME) fiber coated with a hollow microporous organic network (H-MON) was fabricated for the analysis of short-chain chlorinated paraffins (SCCPs). The sorbent was prepared by reacting tetra(4-ethynylphenyl)methane and 1,4-diiodobenzene using bis-(triphenylphosphine) palladium(II) as the catalyst in the presence of silica sphere templates, which then were removed by hydrofluoric acid. The SCCPs were quantified by GC-MS working in the negative chemical ionization mode. Read More

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August 2018
1 Read

One-step synthesis of OH-TiO/TiOF nanohybrids and their enhanced solar light photocatalytic performance.

R Soc Open Sci 2018 Jun 6;5(6):172005. Epub 2018 Jun 6.

College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, People's Republic of China.

TiO/TiOF nanohybrids were quickly synthesized through a hydrothermal process using titanium n-butoxide (TBOT), ethanol (CHOH) and hydrofluoric acid as precursors. The prepared nanohybrids underwent additional NaOH treatment (OH-TiO/TiOF) to enhance their photocatalytic performance. In this paper, the mechanism of NaOH affecting the pathway of transformation from TBOT (Ti precursor) to TiO nanosheets was discussed. Read More

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June 2018
7 Reads

Does a Self-Etching Ceramic Primer Improve Bonding to Lithium Disilicate Ceramics? Bond Strengths and FESEM Analyses.

Oper Dent 2018 Aug 14. Epub 2018 Aug 14.

Objective: To compare the effect of hydrofluoric acid (HF) vs self-etching ceramic primer on resin cement microshear bond strength (μSBS) and ultramorphology of lithium disilicate (LD) ceramic.

Methods And Materials: LD (IPS e.max CAD, Ivoclar Vivadent) blocks (14×4×2 mm) were polished to 1200 grit and assigned to nine groups (n=5): CON: control, no LD surface treatment; IVO: 5. Read More

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Impact of Silane-containing Universal Adhesive on the Biaxial Flexural Strength of a Resin Cement/Glass-Ceramic System.

Oper Dent 2018 Aug 14. Epub 2018 Aug 14.

The aim of this study was to determine whether using a silane-containing universal adhesive as a silane primer in glass-ceramic/resin cement systems affects biaxial flexural strength (BFS) and bonded interface integrity after loading. Glass-ceramic (IPS e.max CAD, Ivoclar/Vivadent, Schaan, Liechtenstein) disc-shaped specimens (6. Read More

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How does hydrofluoric acid etching affect the cyclic load-to-failure of lithium disilicate restorations?

J Mech Behav Biomed Mater 2018 Nov 30;87:306-311. Epub 2018 Jul 30.

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

This study investigated the effect of etching with distinct hydrofluoric (HF) acid concentrations on the cyclic load-to-failure (C) of simplified lithium disilicate glass-ceramic restorations adhesively cemented to a dentin analogue (n = 20): non-etched/control (CTRL), or etched for 20 s with HF acid at 3% (HF3), 5% (HF5), or 10% (HF10). A silane coating was then applied onto the ceramic surfaces. Fatigue tests followed the staircase approach (initial load= 720 N; step-size= 70 N; 500,000 cycles per sample; 20 Hz) using a hemispheric stainless-steel piston (Ø= 40 mm) under water. Read More

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November 2018

Synthesis of Hollow Co-Fe Prussian Blue Analogue Cubes by using Silica Spheres as a Sacrificial Template.

ChemistryOpen 2018 Aug 7;7(8):599-603. Epub 2018 Aug 7.

School of Chemical Engineering and Australian Institute for, Bioengineering and Nanotechnology (AIBN) The University of Queensland Brisbane QLD 4072 Australia.

Herein, we report a novel method for the formation of hollow Prussian blue analogue (CoFe-PBA) nanocubes, using spherical silica particles as sacrificial templates. In the first step, silica cores are coated by a CoFe-PBA shell and then removed by etching with hydrofluoric acid (HF). The cubic shape of CoFe-PBA is well-retained even after the removal of the silica cores, resulting in the formation of hollow CoFe-PBA cubes. Read More

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August 2018
1 Read

[Application of different pretreatment methods in the determination of aluminum in reference substances].

Wei Sheng Yan Jiu 2018 Jul;47(4):634-637

Beijing Center for Disease Control and Prevention, Beijing Center for Preventive Medicine Research, Beijing 100013, China.

Objective: The pretreatment method was studied to solve the disagreement of aluminum in the reference substances between detection and the value of the certificate.

Methods: The pretreatment method of wet digestion with nitric acid, microwave digestion of hydrogen fluoride and dry ashing at different temperatures were used to determine aluminum in the reference substances by plasma emission spectrometry.

Results: Pretreatment method affected the test result of aluminum in reference substances directly. Read More

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July 2018
7 Reads

Interface-Assisted Synthesis of Single-Crystalline ScF Microtubes.

Inorg Chem 2018 Aug 6;57(16):9779-9781. Epub 2018 Aug 6.

St. Petersburg State University , 7-9 Universitetskaya nab. , St. Petersburg 199034 , Russia.

Scandium fluoride (ScF) microtubes with nanoscale wall thickness were for the first time successfully synthesized by an interface-assisted technique at the surface of a scandium nitrate aqueous solution without the addition of any surfactant as a result of interaction with hydrofluoric acid from the gaseous phase in only 30 min. X-ray diffraction analysis, scanning electron microscopy, helium ionic microscopy, transmission electron microscopy (TEM), and high-resolution TEM (HRTEM) were used to examine the morphology and crystal structure of ScF microtubes. The results show that the ScF microtube is single-crystalline and has a hexagonal structure. Read More

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August 2018
2 Reads

Mid-Cretaceous angiosperm radiation and an asterid origin of bilaterality: diverse and extinct "Ericales" from New Jersey.

Am J Bot 2018 Aug 3;105(8):1412-1423. Epub 2018 Aug 3.

Department of Biology, George Mason University, 4400 University Drive, Fairfax, VA, 22030, USA.

Premise Of The Study: Numerous fossils from the Upper Cretaceous have been confidently placed within modern crown groups. Many 95-75 Myr-old taxa, however, including the taxon described herein, do not fit well with known extant crown or stem groups. Understanding such fossils and their possible affinities would certainly enhance our understanding of the circumstances involved in a major eudicot radiation. Read More

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August 2018
8 Reads

High Repetition Rate UV versus VIS Picosecond Laser Fabrication of 3D Microfluidic Channels Embedded in Photosensitive Glass.

Nanomaterials (Basel) 2018 Jul 31;8(8). Epub 2018 Jul 31.

RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

Glass is an alternative solution to polymer for the fabrication of three-dimensional (3D) microfluidic biochips. Femtosecond (fs) lasers are nowadays the most promising tools for transparent glass processing. Specifically, the multiphoton process induced by fs pulses enables fabrication of embedded 3D channels with high precision. Read More

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July 2018
1 Read

Full-Thickness Chemical Burn From Trifluoroacetic Acid: A Case Report and Review of the Literature.

Ann Plast Surg 2018 Nov;81(5):528-530

Regional Burn Center, Santa Clara Valley Medical Center, San Jose, CA.

Trifluoroacetic acid (TFA) burns are an ill-defined entity due to a lack of reported sizable burns from this chemical. In this case report of the largest reported burn from TFA, we demonstrate that TFA causes extensive, progressive full-thickness tissue injury that may initially appear superficial. Trifluoroacetic acid does not seem to involve the systemic toxicities that result from hydrofluoric acid burns, and there is no role for calcium gluconate in acute management based on this case. Read More

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November 2018
2 Reads

Hydrofluoric acid concentrations: Effect on the cyclic load-to-failure of machined lithium disilicate restorations.

Dent Mater 2018 09 19;34(9):e255-e263. Epub 2018 Jul 19.

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 State, Brazil. Electronic address:

Objectives: To evaluate the effects of the etching with different hydrofluoric acid (HF) concentrations on the cyclic load-to-failure (C) of machined lithium disilicate crowns cemented to dentin analogue material.

Methods: Pairs of dentin analogue prosthetic preparations and lithium disilicate ceramic crowns with simplified and standardized designs were machined (n=18). The preparations were etched with 10% HF (60s), followed by primer application. Read More

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September 2018
15 Reads

The Effect of Fractional CO2 Laser Irradiation on Shear Bond Strength of Resin Cement to Feldspathic Porcelain.

J Lasers Med Sci 2018 20;9(2):101-106. Epub 2018 Mar 20.

School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

This study investigated the effect of fractional CO2 laser on shear bond strength (SBS) of resin cement to feldspathic porcelain. Sixty blocks of unglazed feldspathic porcelain were randomly divided into 5 groups of 12 by treatment. Group 1 and 2 underwent etching with 9. Read More

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March 2018
1 Read

Fatal Refractory Ventricular Fibrillation Due to Ingestion of Hydrofluoric Acid.

Pediatr Emerg Care 2018 Jul 16. Epub 2018 Jul 16.

Pediatric Surgery Department.

Hydrofluoric acid (HF) is a colorless and odorless solution of the hydrogen fluoride in water. It is used in some household products. The rapid onset of severe toxicity and death after the ingestion of HF is not reported often. Read More

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July 2018
2 Reads

Assessment the Bond Strength of Ceramic Brackets to CAD/CAM Nanoceramic Composite and Interpenetrating Network Composite after Different Surface Treatments.

Biomed Res Int 2018 30;2018:1871598. Epub 2018 May 30.

Department of Prosthodontics, Akdeniz University Faculty of Dentistry, 07058, Antalya, Turkey.

Adult orthodontics may confront problems related to the bonding performance of orthodontic brackets to new generation restorative materials used for crown or laminate restorations. The aim of the present study was to investigate the shear bond strength of ceramic brackets to two new generation CAD/CAM interpenetrating network composite and nanoceramic composite after different surface treatments. Er,Cr:YSGG Laser, hydrofluoric acid (9%), sandblasting (50 m AlO), and silane were applied to the surfaces of 120 CAD/CAM specimens with 2 mm thickness and then ceramic brackets were bonded to the treated surfaces of the specimens. Read More

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May 2018
3 Reads

Plasmonic silvered nanostructures on macroporous silicon decorated with graphene oxide for SERS-spectroscopy.

Nanotechnology 2018 Sep 10;29(39):395708. Epub 2018 Jul 10.

Micro- and Nanoelectronics Department of BSUIR, Brovka St., 6, 220013, Minsk, Belarus.

A method for fabricating surface-enhanced Raman scattering (SERS)-active substrates by immersion deposition of silver on a macroporous silicon (macro-PS) template with pore diameters and depth ranging from 500-1000 nm is developed. The procedure for the formation of nanostructured silver films in the layers of macro-PS was optimized. Silver particles of dimensions in the nano- and submicron-scale were formed on the external surface of the macro-PS immersed in the water-ethanol solution of AgNO while the inner pore walls were covered by smaller, 10-30 nm diameter, silver nanoparticles. Read More

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September 2018

High Throughput SiRNA Screening for Chloropicrin and Hydrogen Fluoride-Induced Cornea Epithelial Cell Injury.

J Vis Exp 2018 06 16(136). Epub 2018 Jun 16.

US Army Medical Research Institute of Chemical Defense;

Toxicant-induced ocular injury is a true ocular emergency because chemicals have the potential to rapidly inflict significant tissue damage. Treatments for toxicant-induced corneal injury are generally supportive as no specific therapeutics exist to treat these injuries. In the efforts to develop treatments and therapeutics to care for exposure, it can be important to understand the molecular and cellular mechanisms of these injuries. Read More

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June 2018
10 Reads