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https://www.readbyqxmd.com/read/29905504/er-yag-laser-for-metal-and-ceramic-bracket-debonding-an-in-vitro-study-on-intrapulpal-temperature-sem-and-eds-analysis
#1
Kinga Grzech-Leśniak, Jacek Matys, Dorota Żmuda-Stawowiak, Krzysztof Mroczka, Marzena Dominiak, Aldo Brugnera Junior, Reinhard Gruber, Georgios E Romanos, Anton Sculean
OBJECTIVE: To evaluate the effects of bracket removal using an erbium laser on the pulp temperature and enamel surface. BACKGROUND: Removal of orthodontic brackets with conventional debonding pliers may result in enamel cracks. To avoid damage to the enamel surface and effectively remove metal or ceramic brackets, different types of lasers, such as Nd:YAG, CO2 , TM:YAP, diode laser, or Er:YAG, have been introduced for debonding. MATERIALS AND METHODS: A total of 55 brackets (n = 55; 20 metal and 35 ceramic ones) were bonded to 55 caries-free premolars extracted for orthodontic indications...
June 15, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29904754/effect-of-different-surface-treatments-on-the-tensile-bond-strength-to-lithium-disilicate-glass-ceramics
#2
Sai Kham Lyann, Tomohiro Takagaki, Toru Nikaido, Motohiro Uo, Masaomi Ikeda, Alireza Sadr, Junji Tagami
PURPOSE: To evaluate the influence of different surface treatments of lithium disilicate glass ceramics on the bonding efficacy of three luting composites. MATERIALS AND METHODS: A total of 450 blocks of e.max CAD (Ivoclar Vivadent) ground with 600-grit silicon carbide paper were prepared and divided into three groups (n = 150) according to the composite cements used: Variolink Esthetic DC (VE), Multilink Automix (MA), and SpeedCEM (SC). Each group was further divided into five subgroups (n = 10) according to the surface treatment performed: no treatment (control), Monobond Plus (MP), 37% phosphoric acid and Monobond Plus (PA), < 5% hydrofluoric acid and Monobond Plus (HF), and Monobond Etch & Prime (ME)...
June 14, 2018: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29902777/physico-mechanical-properties-of-resin-cement-light-cured-through-different-ceramic-spacers
#3
Fabio Antonio Piola Rizzante, Paula Minatel Locatelli, Thiago Soares Porto, Ana Flávia Sanches Borges, Rafael Francisco Lia Mondelli, Sérgio Kiyoshi Ishikiriama
The purpose of this in vitro study was to compare the micro hardness, color stability/ΔE, and degree of conversion/DC of a resin cement light cured through different ceramic spacers. Lithium-disilicate ceramic samples were obtained from IPS E-max CAD blocks (HT A1) and IPS in-Ceram (transparent neutral); and divided in 7 groups (n = 8 for each test): CTR/control group; 06 M/0.6 mm monolithic; 12 M/1.2 mm monolithic; 20 M/2.0 mm monolithic; 06B/0.4 + 0.2 mm bilayered; 12B/1.0 + 0.2 mm bilayered; 20B/1...
June 4, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29902771/a-non-invasive-spectroscopic-study-to-evaluate-both-technological-features-and-conservation-state-of-two-types-of-ancient-roman-coloured-bricks
#4
C Scatigno, N Prieto-Taboada, M Preite Martinez, A M Conte, J M Madariaga
The study of both original and decaying compounds is relevant in understanding the chemistry behind the deterioration processes, above all in open museum contexts where environmental stressors affect the artefacts. In this sense, a combination of non-invasive spectroscopy techniques (Raman spectroscopy, μ-X-ray fluorescence and X-ray diffraction) was applied on an ancient Roman building (130 CE), the "Casa di Diana" Mithraeum at Ostia Antica archaeological site. The aim is to study the raw materials, manufacturing and decaying products of the two observed types of Roman fired bricks (red and yellow) that compose the building...
June 7, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29901678/boosting-energy-harvesting-performance-in-ba-ca-ti-zr-o-3-lead-free-perovskites-through-artificial-control-of-intermediate-grain-size
#5
Xiaodong Yan, Mupeng Zheng, Shengjun Sun, Mankang Zhu, Yudong Hou
In this study, (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCTZ) lead-free ceramics with enhanced energy density were prepared by two-step sintering. All ceramics fall into the rhombohedral-orthorhombic-tetragonal (R-O-T) phase boundary near room temperature, and a dense microstructure with an intermediate grain size was observed. The enhanced piezoelectric and energy harvesting properties were attained over a wide grain size range of 10-15 μm, benefiting from the construction of the R-O-T phase boundary. Most interestingly, the maximum values of d33 and d33 × g33 (530 pC N-1 and 9720 × 10-15 m2 N-1) can be achieved at 1500/1350 °C with a grain size of 13...
June 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29901266/optical-and-biological-properties-of-polymer-based-nanocomposites-with-improved-dispersion-of-ceramic-nanoparticles
#6
Cheyann Lee Wetteland, Huinan Liu
This article reports a new process for creating polymer-based nanocomposites with enhanced dispersion of ceramic nanoparticles without using any surfactants, and the resulted changes in their optical and biological properties. Specifically, dispersion of two different ceramic nanoparticles, i.e, hydroxyapatite (nHA) and magnesium oxide (nMgO) nanoparticles, in a model biodegradable polymer, namely poly (lactic-co-glycolic acid) (PLGA), was studied. High-power sonication was integrated with dual asymmetric centrifugal (DAC) mixing to improve dispersion of nanoparticles during solvent casting...
June 14, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29900921/effect-of-conventional-and-microwave-glazing-on-surface-roughness-of-metal-ceramics-an-atomic-force-microscopy-analysis
#7
Akanksha Sachdeva, Nayana Prabhu, B Dhanasekar, I N Aparna
Purpose: This study investigated and compared the surface roughness achieved by glazing porcelain samples in a conventional and a microwave oven. Materials and Methods: Two commercial brands of metal ceramics were used, VITA VMK MASTER and IPS CLASSIC. Sixty samples were fabricated, 30 for each type of ceramic. The samples were sintered in the conventional oven and hand-polished to remove any irregularities. Samples (n = 10) from each type of ceramic were further divided into three groups as follows: hand-polished (Group A), conventional oven glazed (Group B), and microwave glazed (Group C)...
May 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29899969/bone-substitutes-a-review-of-their-characteristics-clinical-use-and-perspectives-for-large-bone-defects-management
#8
REVIEW
Gabriel Fernandez de Grado, Laetitia Keller, Ysia Idoux-Gillet, Quentin Wagner, Anne-Marie Musset, Nadia Benkirane-Jessel, Fabien Bornert, Damien Offner
Bone replacement might have been practiced for centuries with various materials of natural origin, but had rarely met success until the late 19th century. Nowadays, many different bone substitutes can be used. They can be either derived from biological products such as demineralized bone matrix, platelet-rich plasma, hydroxyapatite, adjunction of growth factors (like bone morphogenetic protein) or synthetic such as calcium sulfate, tri-calcium phosphate ceramics, bioactive glasses, or polymer-based substitutes...
January 2018: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/29898523/life-cycle-study-of-different-constructive-solutions-for-building-enclosures
#9
Luz Garcia-Ceballos, Jose Ramon de Andres-Díaz, Miguel A Contreras-Lopez
The construction sector must advance in a more sustainable way and to achieve this goal, the application of global methodologies is needed. These methodologies should take into account all life stages of a building: planning, design, construction, use and demolition. The quantity and variety of the materials used in building construction condition the buildings' environmental and energy impacts. Life Cycle Assessment offers a standardized framework to evaluate the environmental loads of a product, process or activity...
June 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29898019/inorganic-filler-content-of-resin-based-luting-agents-and-the-color-of-ceramic-veneers
#10
Fabíola Jardim Barbon, Rafael Ratto Moraes, Joseane Viccari Calza, Ana Paula Perroni, Aloísio Oro Spazzin, Noéli Boscato
The influence of inorganic filler content of resin-based luting agents (RBLAs) on color change (ΔE00), CIEL*a*b* (individual color coordinates), and translucency parameters (TP) of simulated ceramic laminate veneer (CLV) was investigated. RBLAs with low, intermediate, and high inorganic filler content (55%, 65%, and 75% mass fractions, respectively) were prepared. Feldspar ceramic (Vitablocs Mark II) specimens (1.2 mm × 0.8 mm, A1C shade) were bonded to simulated composite resin substrates (1.6 mm × 1.2 mm, A2D shade) using three experimental and a commercial (RelyX Veneer) RBLA (translucent shade)...
June 7, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29897356/color-differences-between-pink-veneering-ceramics-and-the-human-gingiva
#11
Nicola Alberto Valente, Irena Sailer, Vincent Fehmer, Daniel Stefan Thoma
The aim of this study was to examine 10 different shades of pink ceramic to determine which one best matches the mean color of human gingiva. Bar-shaped zirconia samples were fabricated and veneered with 1 of 10 pink zirconia veneering ceramics. The color of the gingiva at the central maxillary incisors of 20 healthy volunteers was compared to the pink veneering ceramics using a spectrophotometer (Spectroshade, MHT). The obtained color parameters L*, a*, and b* (CIELAB) of the gingiva and the ceramics were used to calculate the color difference (ΔE)...
June 12, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29897352/esthetic-evaluation-of-maxillary-single-tooth-zirconia-implants-in-the-esthetic-zone
#12
Kristian Kniha, Heinz Kniha, Ingrid Grunert, Daniel Edelhoff, Frank Hölzle, Ali Modabber
The purpose of this study was to evaluate ceramic dental implants using different esthetic scores. A total of 53 ceramic dental implants were evaluated using the Pink Esthetic Score (PES), White Esthetic Score (WES), and Peri-Implant and Crown Index (PICI). Prosthodontists, orthodontists, oral surgeons, and dentistry students independently performed assessments. The mean value of combined PES + WES was 17.4 points, and the PICI was 523.2 points. Orthodontists assessed a significantly lower result in both indices compared to all other assessor groups (P ≤ ...
June 12, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29896787/fatigue-behavior-of-different-cad-cam-materials-for-monolithic-implant-supported-molar-crowns
#13
Bruno Salles Sotto-Maior, Rafael Corrêa Carneiro, Carlos Eduardo Francischone, Neuza Maria Souza Picorelli Assis, Karina Lopes Devito, Plinio Mendes Senna
PURPOSE: To evaluate the fracture resistance after the thermal and mechanical fatigue of feldspathic, lithium disilicate, and resin-modified CAD/CAM monolithic crowns cemented onto a universal post abutment. MATERIALS AND METHODS: A right second mandibular molar was designed in CAD/CAM software, and 30 crowns were machined using three different materials (n = 10): feldspathic ceramic, finished only with a glaze cycle (G1); lithium disilicate, sintered and finished with a glaze cycle (G2); and resin, modified by nanoceramic and finished with rubber (G3)...
June 13, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29894641/monolithic-all-phosphate-solid-state-lithium-ion-battery-with-improved-interfacial-compatibility
#14
Shicheng Yu, Andreas Mertens, Hermann Tempel, Roland Schierholz, Hans Kungl, Rüdiger-A Eichel
High interfacial resistance in between solid electrolyte and electrode of ceramic all-solid-state batteries is a major reason for the reduced performance of these batteries. A solid state battery using a monolithic all-phosphate concept based on screen printed thick LiTi2 (PO4 )3 anode and Li3 V2 (PO4 )3 cathode composite layers on a densely sintered Li1.3 Al0.3 Ti1.7 (PO4 )3 solid electrolyte has been realized with competitive cycling performance. The choice of materials was primarily based on the (electro-)chemical and mechanical matching of the components instead of a solely focusing on high-performance...
June 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29892536/evaluation-of-fracture-resistance-and-mode-of-failure-of-premolars-restored-with-nanohybrid-composite-ormocer-and-ceramic-inlays
#15
Mohit K Gunwal, Pratima R Shenoi, Tanvee Paranjape, Sonal Dhote, Ravish Tongya, Magesh Kumar, Sanjay Rastogi
Objectives: To evaluate the fracture resistance and mode of failure of maxillary premolars restorations restored with nanohybrid Composite, ORMOCER and Ceramic Inlays. Materials and method: 100 extracted first maxillary premolar were collected. Samples were divided into five groups. Group I - Intact premolars, Group II -MOD cavities without restorations, Group III - MOD cavities restored with composite restoration, GROUP IV - MOD cavities restored with ORMOCER restoration and GROUP V - MOD cavities restored with ceramic inlays...
May 2018: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/29891763/trial-of-an-all-ceramic-sno%C3%A2-gas-sensor-equipped-with-cacu%C3%A2-ru%C3%A2-o-12-heater-and-electrode
#16
Akihiro Tsuruta, Toshio Itoh, Masashi Mikami, Yoshiaki Kinemuchi, Ichiro Terasaki, Norimitsu Murayama, Woosuck Shin
We have constructed a gas sensor of SnO₂ equipped with ceramic electrodes and a heater made of CaCu₃Ru₄O12 , which demonstrated good device performance at high temperature. The CaCu₃Ru₄O12 -based electrodes and heater were formed on Al₂O₃ substrates using a screen-printing process, which is cost-effective and suitable for mass-production. This all-ceramic device reached 600 &deg;C at the lowest, and remained intact after one week of operation at 500 &deg;C and rapid thermal cycling of 500 &deg;C temperature changes within 10 s...
June 11, 2018: Materials
https://www.readbyqxmd.com/read/29889916/clinical-performance-of-cad-cam-tooth-supported-ceramic-restorations-a-systematic-review
#17
Inês Filipa Alves de Carvalho, Tiago Miguel Santos Marques, Filipe Miguel Araújo, Luís Filipe Azevedo, Helena Donato, André Correia
Owing to an increased demand for safe and esthetically pleasing dental materials, ceramics have been developed and optimized to rehabilitate anterior and posterior teeth. This evolution in ceramic materials is directly related to the development of sophisticated processing technologies and systems for use in dental medicine, particularly computer-aided design/computer-assisted manufacture (CAD/CAM) technology. This study is a systematic review outlining long-term clinical survival rates of single-tooth restorations fabricated with CAD/CAM technology with a minimum follow-up of 3 years...
July 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29888712/effect-of-cavity-design-on-the-fracture-resistance-of-zirconia-onlay-ceramics
#18
P Oyar, R Durkan
Objective: The purpose of this study was to evaluate the fracture resistance and failure modes of onlay restorations prepared with different preparation designs. Materials and Methods: A total of 42 extracted, mandibular first molars (36, 46) were used and divided into six groups according to preparation design, as follows 1A: Anatomic preparation of cusps/rounded shoulder margin/occlusal groove; 1B: Flat preparation of cusps/rounded shoulder margin/occlusal groove; 2A: Anatomical preparation of cusps/occlusal groove; 2B: Flat preparation of cusps/occlusal groove; 3A: Complete anatomical reduction of cusps/rounded shoulder margin; 3B: Complete flat reduction of cusps/rounded shoulder margin groups; intact tooth: No preparation...
June 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29886803/potters-make-shorter-pots-under-conditions-of-reduced-sensory-input
#19
Mounia Ziat, Min Park, Brian Kakas, David A Rosenbaum
Although people have made clay pots for millennia, little behavioral research has explored how they do so. We were specifically interested in potters' use of auditory, haptic, and visual feedback. We asked what would happen if one or two of these sources of feedback were removed and potters tried to create pots of a given height, stopping when they thought they had reached that height. We asked students in a pottery class to build simple clay vessels either when they had full sensory feedback (in the control condition for all participants) or when they had reduced input from one modality (in Experiment 1) or two modalities (in Experiment 2)...
January 1, 2018: Perception
https://www.readbyqxmd.com/read/29881885/dual-energy-ct-and-ceramic-or-titanium-prostheses-material-reduce-ct-artifacts-and-provide-superior-image-quality-of-total-knee-arthroplasty
#20
Maximilian F Kasparek, Michael Töpker, Mathias Lazar, Michael Weber, Michael Kasparek, Thomas Mang, Paul Apfaltrer, Bernd Kubista, Reinhard Windhager, Helmut Ringl
PURPOSE: To evaluate the influence of different scan parameters for single-energy CT and dual-energy CT, as well as the impact of different material used in a TKA prosthesis on image quality and the extent of metal artifacts. METHODS: Eight pairs of TKA prostheses from different vendors were examined in a phantom set-up. Each pair consisted of a conventional CoCr prosthesis and the corresponding anti-allergic prosthesis (full titanium, ceramic, or ceramic-coated) from the same vendor...
June 7, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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