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https://www.readbyqxmd.com/read/28923548/survival-of-extensively-damaged-endodontically-treated-incisors-restored-with-different-types-of-posts-and-core-foundation-restoration-material
#1
Priscilla Cardoso Lazari, Marco Aurélio de Carvalho, Altair A Del Bel Cury, Pascal Magne
STATEMENT OF PROBLEM: Which post-and-core combination will best improve the performance of extensively damaged endodontically treated incisors without a ferrule is still unclear. PURPOSE: The purpose of this in vitro study was to investigate the restoration of extensively damaged endodontically treated incisors without a ferrule using glass-ceramic crowns bonded to various composite resin foundation restorations and 2 types of posts. MATERIAL AND METHODS: Sixty decoronated endodontically treated bovine incisors without a ferrule were divided into 4 groups and restored with various post-and-core foundation restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28923547/how-oral-environment-simulation-affects-ceramic-failure-behavior
#2
Ediléia Lodi, Kátia R Weber, Paula Benetti, Pedro H Corazza, Álvaro Della Bona, Márcia Borba
STATEMENT OF PROBLEM: Investigating the mechanical behavior of ceramics in a clinically simulated scenario contributes to the development of new and tougher materials, improving the clinical performance of restorations. The optimal in vitro environment for testing is unclear. PURPOSE: The purpose of this in vitro study was to investigate the failure behavior of a leucite-reinforced glass-ceramic under compression loading and fatigue in different simulated oral environment conditions...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28922616/novel-testing-for-corrosion-of-glass-ceramics-for-dental-applications
#3
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/28902238/dental-ceramics-a-review-of-new-materials-and-processing-methods
#4
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/28892655/bonding-to-cad-cam-composites-an-interfacial-fracture-toughness-approach
#5
M Eldafrawy, M G Ebroin, P A Gailly, J-F Nguyen, M J Sadoun, A K Mainjot
The objective of this study was to evaluate the interfacial fracture toughness (IFT) of composite cement with dispersed filler (DF) versus polymer-infiltrated ceramic network (PICN) computer-aided design and computer-aided manufacturing (CAD-CAM) composite blocks after 2 different surface pretreatments using the notchless triangular prism (NTP) test. Two DFs (Cerasmart [CRT] and Lava Ultimate [LVA]), 2 PICNs (Enamic [ENA] and experimental PICN [EXP]), and e.max CAD lithium disilicate glass-ceramic (EMX, control) prism samples were bonded to their counterparts with Variolink Esthetic DC composite cement after either hydrofluoric acid etching (HF) or gritblasting (GR)...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28891945/optical-characterization-of-nano-and-microcrystals-of-eupo%C3%A2-created-by-one-step-synthesis-of-antimony-germanate-silicate-glass-modified-by-p%C3%A2-o%C3%A2
#6
Jacek Zmojda, Marcin Kochanowicz, Piotr Miluski, Agata Baranowska, Wojciech A Pisarski, Joanna Pisarska, Renata Jadach, Maciej Sitarz, Dominik Dorosz
Technology of active glass-ceramics (GC) is an important part of luminescent materials engineering. The classic method to obtain GC is based on annealing of parent glass in proper temperature and different time periods. Generally, only the bulk materials are investigated as a starting host for further applications. However, the effect of an additional heat-treatment process on emission and structural properties during GC processing is omitted. Here, we focus on the possibility of obtaining transparent glass-ceramic doped with europium ions directly with a melt-quenching method...
September 9, 2017: Materials
https://www.readbyqxmd.com/read/28884029/a-step-by-step-conservative-approach-for-cad-cam-laminate-veneers
#7
Gerardo Durán Ojeda, Ismael Henríquez Gutiérrez, Álvaro Guzmán Marusic, Abelardo Báez Rosales, José Pablo Tisi Lanchares
The use of CAD/CAM technology has allowed the fabrication of ceramic restorations efficiently and with predictable results. Lithium disilicate is a type of glass ceramic material that can be used for the elaboration of laminate veneers, being monolithic restorations which require characterization through a covering ceramic in order to achieve acceptable esthetic results. The next case report shows a predictable clinical protocol for the rehabilitation of the anterior teeth through the preparation of CAD/CAM veneers (e...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28883529/the-formation-of-nanocrystalline-zro2-nuclei-in-a-li2o-al2o3-sio2-glass-a-combined-xanes-and-tem-study
#8
Enrico Kleebusch, Christian Patzig, Michael Krause, Yongfeng Hu, Thomas Höche, Christian Rüssel
The high economic importance of glass ceramics based on Li2O/Al2O3/SiO2 (LAS) is mainly due to their low coefficients of thermal expansion (CTE), which make these materials suitable candidates for a number of applications. The exact mechanism of the crystallization processes in LAS glasses is still not fully understood. The present work focuses on the formation and development of nanocrystalline ZrO2 within an LAS base composition which contains only ZrO2 as nucleating agent. Using a combination of transmission electron microscopy and X-ray absorption spectroscopy techniques, the temporal evolution of the ZrO2 nanocrystal formation is described...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28875824/applications-of-bauxite-residue-a-mini-review
#9
Ajay S Verma, Narendra M Suri, Suman Kant
Bauxite residue is the waste generated during alumina production by Bayer's process. The amount of bauxite residue (40-50 wt%) generated depends on the quality of bauxite ore used for the processing. High alkalinity and high caustic content in bauxite residue causes environmental risk for fertile soil and ground water contamination. The caustic (NaOH) content in bauxite residue leads to human health risks, like dermal problems and irritation to eyes. Moreover, disposal of bauxite residue requires a large area; such problems can only be minimised by utilising bauxite residue effectively...
September 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28874990/in-vitro-study-of-the-fracture-resistance-of-monolithic-lithium-disilicate-monolithic-zirconia-and-lithium-disilicate-pressed-on-zirconia-for-three-unit-fixed-dental-prostheses
#10
Jae-Won Choi, So-Yeun Kim, Ji-Hyeon Bae, Eun-Bin Bae, Jung-Bo Huh
PURPOSE: The purpose of this study was to determine fracture resistance and failure modes of three-unit fixed dental prostheses (FDPs) made of lithium disilicate pressed on zirconia (LZ), monolithic lithium disilicate (ML), and monolithic zirconia (MZ). MATERIALS AND METHODS: Co-Cr alloy three-unit metal FDPs model with maxillary first premolar and first molar abutments was fabricated. Three different FDPs groups, LZ, ML, and MZ, were prepared (n = 5 per group)...
August 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28872726/bond-strength-of-resin-cement-and-glass-ionomer-to-nd-yag-laser-treated-zirconia-ceramics
#11
Nafiseh Asadzadeh, Foojan Ghorbanian, Farzaneh Ahrary, Hamidreza Rajati Haghi, Reza Karamad, Amir Yari, Abdollah Javan
PURPOSE: To investigate the effect of neodymium-doped yttrium aluminum garnet (Nd:YAG) laser irradiation on the surface properties and bond strength of zirconia ceramics. MATERIALS AND METHODS: Forty-eight zirconia ceramic pieces (4 × 4 × 1 mm(3) ) were divided into four groups according to surface treatment as follows: two control groups (no treatment) for resin bonding (CRC) and glass ionomer (GI) bonding (CGC); two laser treatment groups (Nd:YAG irradiation, 3 W, 200 MJ, 10 Hz, 180 μs) for resin bonding (LRC) and GI bonding (LGC)...
September 5, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28869621/influence-of-fibre-reinforcement-on-selected-mechanical-properties-of-dental-composites
#12
Agata M Niewczas, Jolanta Zamościńska, Aneta Krzyżak, Daniel Pieniak, Agata Walczak, Grzegorz Bartnik
PURPOSE: For splinting or designing adhesive bridges, reconstructive composite structures with increased mechanical properties owing to embedded reinforcement fibres are used. The aim of this article was to determine the influence of glass and aramid fibres on the mechanical strength of composites reinforced with these fibres. METHODS: Two polymer-ceramic microhybrid materials: Boston and Herculite were tested. Three types of reinforcement fibres were used: aramid (Podwiązka) with a single layer weave, a single layer weave glass fibre (FSO) and triple layer weave glass fibre (FSO evo)...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28869428/preliminary-studies-of-pva-pvp-blends-incorporated-with-hap-and-%C3%AE-tcp-bone-ceramic-as-template-for-hard-tissue-engineering
#13
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
Polyvinylalcohol (PVA) and Polyvinylpyrrolidone (PVP) blend incorporated with hydroxyapatite (HAp) and β-tricalcium phosphate (β-TCP) is electrospun as nanofibrous composite scaffolds to act as suitable template for bone tissue engineering. Microscopic and spectroscopic characterizations confirm uniform integration of the crystalline calcium phosphate ceramics in the scaffolds. PVA-PVP blends are usually amorphous in nature and addition of phosphate ceramic particles specifically HAp elevates its crystalline behavior which is substantiated by XRD details...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28863911/quantitative-analysis-of-enamel-on-debonded-orthodontic-brackets
#14
Nathan J Cochrane, Thomas W G Lo, Geoffrey G Adams, Paul M Schneider
INTRODUCTION: Iatrogenic damage to the tooth surface in the form of enamel tearouts can occur during removal of fixed orthodontic appliances. The aim of this study was to assess debonded metal and ceramic brackets attached with a variety of bonding materials to determine how frequently this type of damage occurs. METHODS: Eighty-one patients close to finishing fixed orthodontic treatment were recruited. They had metal brackets bonded with composite resin and a 2-step etch-and-bond technique or ceramic brackets bonded with composite resin and a 2-step etch-and- bond technique, and composite resin with a self-etching primer or resin-modified glass ionomer cement...
September 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28857711/wear-evaluation-of-prosthetic-materials-opposing-themselves
#15
C D'Arcangelo, L Vanini, G D Rondoni, M Vadini, F De Angelis
The purpose of the present in vitro study was to compare the two-body wear resistance of a type 3 gold alloy (Aurocast8), two lithium disilicate glass ceramics (IPS e.max CAD and IPS e.max Press), a heat-pressed feldspathic porcelain (Cerabien ZR Press), an yttria-stabilized tetragonal zirconia polycrystal ceramic (Katana Zirconia ML), and three heat-cured composite resins (Ceram.X Universal, Enamel Plus Function, and Enamel Plus HRi) opposing antagonistic cusps made out of the same restorative materials. Ten 6-mm-thick samples and 10 cusp-shaped abraders were manufactured with each test material (n=10) according to standard laboratory procedures...
August 31, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28853505/-effect-of-repeated-sintering-and-variations-in-thickness-on-the-color-and-microstructure-of-dental-lithium-disilicate-based-glass-ceramic-veneers
#16
Huang Cui, Yu Jia, Meng Shaofeng, Gao Biyun
Objective The aim of this study is to evaluate the effect of repeated sintering and variation in thickness on the color and microstructure of dental lithium disilicate-based glass ceramic veneers. Methods A total of 24 computer aided design and computer aided manufacturing (CAD/CAM) veneers was fabricated using the IPS e.max-CAD LS2 and then randomly divided into four groups (S0, S1, S2, S3; n=6). Each group was sintered 0, 1, 2, 3 times individually according to the manufacturer's recommendation. The color parameters (L, C, H, a, b values) of all the specimens were measured by a Vita easyshade dental colorimeter...
August 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28851519/bioactive-glass-ceramic-nanoparticles-coated-poly-l-lactic-acid-scaffold-improved-osteogenic-differentiation-of-adipose-stem-cells-in-equine
#17
Fatemeh Sadat Mahdavi, Abdolreza Salehi, Ehsan Seyedjafari, Abdollah Mohammadi-Sangcheshmeh, Abdolreza Ardeshirylajimi
Horses with big bone fractures have low chance to live mainly due to the lake of a proper treatment strategy. We believe that further attempts in equine bone tissue engineering will probably be required to meet all the needs for the lesion therapies. Therefore in this study we aimed to investigate the osteogenic differentiation capacity of equine adipose-derived stem cells (e-ASCs) on nano-bioactive glass (nBGs) coated poly(l-lactic acid) (PLLA) nanofibers scaffold (nBG-PLLA). Using electrospinning technique, PLLA scaffold was prepared successfully and coated with nBGs...
July 20, 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28845035/comparative-fracture-behavior-of-monolithic-and-veneered-zirconia-posterior-fixed-dental-prostheses
#18
Carlos Lopez-Suarez, Veronica Rodriguez, Jesus Pelaez, Ruben Agustin-Panadero, Maria J Suarez
The purpose of this study was to evaluate and to compare the fracture load and the fracture pattern of monolithic and veneered zirconia posterior fixed dental prostheses (FDPs). Twenty standardized steel dies were prepared to receive posterior 3-unit FDPs. Specimens were randomly divided into 2 groups (n=10): (1) Lava Zirconia, and (2) Lava Plus. All FDPs were cemented using glass ionomer cement and subjected to thermal and mechanical cycling at 5-55ºC with a 30-s dwell time for 120,000 masticatory cycles...
August 25, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28843882/influence-of-various-bonding-techniques-on-the-fracture-strength-of-thin-cad-cam-fabricated-occlusal-glass-ceramic-veneers
#19
Christine Yazigi, Matthias Kern, Mohamed Sad Chaar
OBJECTIVES: To evaluate the efficiency of immediate dentin sealing and the effects of different bonding protocols on the fracture strength of CAD/CAM occlusal veneers bonded to exposed dentin. METHODS: Ninety-six extracted maxillary premolars were initially divided into three main groups with 32 specimens each: without immediate dentin sealing, immediate dentin sealing/total etching and immediate dentin sealing/selective etching. Teeth were identically prepared in the dentin to receive occlusal veneers of 0...
August 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28829937/using-cad-cam-modified-correlation-mode-to-produce-laminate-veneers-a-six-month-case-report
#20
Fsf de Siqueira, Afm Cardenas, Y L Gruber, C Kose, Y M Pupo, G M Gomes, Omm Gomes, J C Gomes
The expectation of an esthetically harmonious smile increases the level of difficulty when treating patients. Laminate veneers stand out as a treatment option for cosmetic rehabilitation in clinical practice, as they are a more conservative procedure and mimic dental structures. These laminate veneers are generally made with different techniques; the most common requires an impression of the prepared tooth, an impression antagonist, fabrication models, and extensive laboratory time. The computer-aided design/computer-aided manufacturing (CAD/CAM) system optimizes the fabrication of prosthetic structures, reducing chairside time and promoting good esthetic results...
September 2017: Operative Dentistry
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