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https://www.readbyqxmd.com/read/28228165/determining-optimal-fluorescent-agent-concentrations-in-dental-adhesive-resins-for-imaging-the-tooth-restoration-interface
#1
Odair Bim Júnior, Marco A Cebim, Maria T Atta, Camila M Machado, Luciana F Francisconi-Dos-Rios, Linda Wang
Fluorescent dyes like Rhodamine B (RB) have been used to identify the spatial distribution of adhesive restorative materials in the tooth/restoration interface. Potential effects of the addition of RB to dental adhesives were addressed in the past, but no further information is available on how to determine suitable concentrations of RB in these bonding agents for imaging in the confocal laser scanning microscope. This study provides systematical strategies for adding RB to viscous dental adhesive resins, focusing on the determination of the lowest range of dye concentrations necessary to achieve an acceptable image of the dentin/adhesive interface...
February 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28223199/poly-methyl-methacrylate-with-tio2-nanoparticles-inclusion-for-stereolitographic-complete-denture-manufacturing-the-fututre-in-dental-care-for-elderly-edentulous-patients
#2
Eugenia Eftimie Totu, Aurelia Cristina Nechifor, Gheorghe Nechifor, Hassan Y Aboul-Enein, Corina Marilena Cristache
OBJECTIVES: The aim of this study was to obtain a Poly(methylmethacrylate) (PMMA)-TiO2 nanocomposite material with improved antibacterial characteristics, suitable for manufacturing 3D printed dental prosthesis. METHODS: 0.2, 0.4, 0.6, 1, 2.5 by weight% of TiO2 nanoparticles have been added to the commercially available stereolithographic PMMA material and the obtained nanocomposites have been analyzed using FTIR, SEM and also tested for antimicrobial efficacy against bacterial cultures from Candida species (C...
February 18, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28222906/microstructural-characterization-of-dental-zinc-phosphate-cements-using-combined-small-angle-neutron-scattering-and-microfocus-x-ray-computed-tomography
#3
Alberto Viani, Konstantinos Sotiriadis, Ivana Kumpová, Lucia Mancini, Marie-Sousai Appavou
OBJECTIVE: To characterize the microstructure of two zinc phosphate cement formulations in order to investigate the role of liquid/solid ratio and composition of powder component, on the developed porosity and, consequently, on compressive strength. METHODS: X-ray powder diffraction with the Rietveld method was used to study the phase composition of zinc oxide powder and cements. Powder component and cement microstructure were investigated with scanning electron microscopy...
February 17, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28217538/prevalence-of-facial-asymmetry-in-tirupati-population-a-posteroanterior-cephalometric-and-photographic-study
#4
M Radhika Reddy, Srinivasa R Bogavilli, V Raghavendra, Venkata S Polina, Shaik Z Basha, R Preetham
AIMS AND OBJECTIVE: The human face is the most prominent aspect in human social interactions, and therefore, it seems reasonable opting for orthodontic treatment is to overcome psychosocial difficulties relating to facial and dental appearance and enhance the quality of life in doing so. MATERIALS AND METHODS: Posteroanterior cephalograms and frontal photographs of 100 participants (50 males and 50 females) were analyzed to evaluate skeletal asymmetry by the analysis suggested by Grummons...
December 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28215957/an-approach-to-understanding-tribological-behaviour-of-dental-composites-through-volumetric-wear-loss-and-wear-mechanism-determination-beyond-material-ranking
#5
Asmaa Altaie, Nigel L Bubb, Paul Franklin, Adam H Dowling, Garry J P Fleming, David J Wood
OBJECTIVE: To investigate the fundamental wear mechanisms of six resin-based composite (RBC) formulations during short-term in-vitro wear testing. MATERIALS: RBC materials were condensed into rectangular bar-shaped specimens and light irradiated using the ISO 4049 specimen manufacture and irradiation protocol. Wear testing (n=10 specimens for each RBC) was performed on a modified pin-on-plate wear test apparatus and wear facets were analysed for wear volume loss using a white light profilometer...
February 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28212980/biofilm-formation-and-release-of-fluoride-from-dental-restorative-materials-in-relation-to-their-surface-properties
#6
Sebastian Hahnel, Andrei C Ionescu, Gloria Cazzaniga, Marco Ottobelli, Eugenio Brambilla
OBJECTIVES: To elucidate the impact of surface properties and the release of fluoride from different glass ionomer cements on biofilm formation. METHODS: Standardized specimens manufactured from various classes of glass ionomer cements (GICs), a resin-based composite (RBC), and human enamel were subjected to surface analyses. Subsequent to simulation of salivary pellicle formation, Streptococcus mutans biofilm formation was initiated using a drip flow reactor for 48h and 96h...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28212979/degradation-of-optical-and-surface-properties-of-resin-based-composites-with-distinct-nanoparticle-sizes-but-equivalent-surface-area
#7
Vinícius Esteves Salgado, Larissa Maria Cavalcante, Rafael R Moraes, Harry B Davis, Jack L Ferracane, Luis Felipe Schneider
OBJECTIVE: To determine the optical and surface properties of model resin-based composites made with distinct nanoparticle sizes but equalized surface area, among them, before and after ageing. METHODS: Model resin-based composites based on BisGMA/TEGDMA (50:50mol%) were loaded with three different fumed silica filler content (7nm/examethyldisilazane, 12nm/octylsilane, and 16nm/dimethylchlorosilane), but with equivalent surface area (BET method). The optical and surface properties of the disk-shaped specimens were measured in 24h after photoactivation (baseline) and repeated after water storage (90days at 37°C), and after abrasion (20,000 cycles of brushing)...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28212978/a-systematic-review-of-the-survival-and-complication-rates-of-inlay-retained-fixed-dental-prostheses
#8
REVIEW
Junyu Chen, He Cai, Lai Suo, Yiyuan Xue, Jian Wang, Qianbing Wan
OBJECTIVES: The aim of this systematic review was to investigate the survival and complication rates of inlay-retainer fixed dental prostheses (IRFDPs). DATA/SOURCES: A systematic search was conducted in the PubMed, EMBASE, and Cochrane Library databases in English and time filters (articles published from 1960) were used. STUDY SELECTION: Randomized controlled trails (RCTs), controlled clinical trials (CCTs) and prospective cohort studies on IRFDPs with a mean follow-up period of at least 2 years were included...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28210447/the-effect-of-different-insertion-techniques-on-the-depth-of-cure-and-vickers-surface-micro-hardness-of-two-bulk-fill-resin-composite-materials
#9
Lamiaa-Mahmoud Moharam, Ahmed-Zohair El-Hoshy, Karim Abou-Elenein
BACKGROUND: The aim of this study was to evaluate the Vickers surface micro-hardness and the depth of cure of two bulk-fill resin composites and one incremental-fill resin composite. MATERIAL AND METHODS: Two Bulk-fill dental resin composites (X-tra Fil, Voco; Sonic-FillTM 2, Kerr Corporation) and an incremental-fill dental resin composite (Filtek™ Z250 XT, 3M ESPE) were used. Sixty cylindrical specimens of 4 mm thickness were prepared using split Teflon moulds...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28206901/assessment-of-enamel-bond-strength-of-hypoplastic-primary-teeth
#10
Lisa Scheidt, Mariane Emi Sanabe, Fabrãcio Mezzomo Collares, Vicente Castelo Branco Leitune, Eduardo Bresciani, Michele Baffi Diniz
PURPOSE: The purpose of this study was to compare the enamel bond strength of hypoplastic and healthy primary teeth. METHODS: Twenty-five hypoplastic teeth (experimental group) and 25 healthy primary teeth (control group) were selected and conditioned with 35 percent orthophosphoric acid before a two-layer adhesive system (Single Bond) was applied. Composite resin (Filtek Z350) was inserted in a single application, two-mm high and one-mm in diameter, and then light-cured for 20 seconds...
October 15, 2016: Pediatric Dentistry
https://www.readbyqxmd.com/read/28203014/-influence-of-surface-treatment-with-sodium-hypochlorite-solution-on-dentin-bond-strength
#11
Y Wang, Y H Liang
OBJECTIVE: To evaluate the influence of sodium hypochlorite (NaOCl) solution used during root canal therapy on dentin bond strength. METHODS: In the study, 15 freshly extracted human third molars with complete dental crowns, caries and filling-free were selected. The occlusal enamel was removed perpendicular to the long axis of the tooth to expose middle flat surfaces of sound dentin. The occlusal dentin surfaces were then polished using 600-grit silicon papers for 1 min and rinsed with deionized water for 1 min...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28196604/addition-of-bioactive-glass-to-glass-ionomer-cements-effect-on-the-physico-chemical-properties-and-biocompatibility
#12
T De Caluwé, C W J Vercruysse, I Ladik, R Convents, H Declercq, L C Martens, R M H Verbeeck
OBJECTIVES: Glass ionomer cements (GICs) are a subject of research because of their inferior mechanical properties, despite their advantages such as fluoride release and direct bonding to bone and teeth. Recent research aims to improve the bioactivity of the GICs and thereby improve mechanical properties on the long term. In this study, two types of bioactive glasses (BAG) (45S5F and CF9) are combined with GICs to evaluate the physico-chemical properties and biocompatibility of the BAG-GIC combinations...
February 10, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28196330/decellularized-human-dental-pulp-as-a-scaffold-for-regenerative-endodontics
#13
J S Song, K Takimoto, M Jeon, J Vadakekalam, N B Ruparel, A Diogenes
Teeth undergo postnatal organogenesis relatively late in life and only complete full maturation a few years after the crown first erupts in the oral cavity. At this stage, development can be arrested if the tooth organ is damaged by either trauma or caries. Regenerative endodontic procedures (REPs) are a treatment alternative to conventional root canal treatment for immature teeth. These procedures rely on the transfer of apically positioned stem cells, including stem cells of the apical papilla (SCAP), into the root canal system...
February 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28194363/in-vitro-study-of-streptococcus-mutans-adhesion-on-composite-resin-coated-with-three-surface-sealants
#14
Da Hye Kim, Tae-Yub Kwon
OBJECTIVES: Although the coating of surface sealants to dental composite resin may potentially reduce bacterial adhesion, there seems to be little information regarding this issue. This preliminary in vitro study investigated the adhesion of Streptococcus mutans (S. mutans) on the dental composite resins coated with three commercial surface sealants. MATERIALS AND METHODS: Composite resin (Filtek Z250) discs (8 mm in diameter, 1 mm in thickness) were fabricated in a mold covered with a Mylar strip (control)...
February 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28183677/hierarchical-micro-nano-structured-ti6al4v-surface-topography-via-two-step-etching-process-for-enhanced-hydrophilicity-and-osteoblastic-responses
#15
Byeong-Seok Moon, Sungwon Kim, Hyoun-Ee Kim, Tae-Sik Jang
Hierarchical micro-nano (HMN) surface structuring of dental implants is a fascinating strategy for achieving fast and mechanically stable fixation due to the synergetic effect of micro- and nano-scale surface roughness with surrounding tissues. However, the introduction of a well-defined nanostructure on a microstructure having complex surface geometry is still challenging. As a means of fabricating HMN surface on Ti6Al4V-ELI, target-ion induced plasma sputtering (TIPS) was used onto a sand-blasted, large-grit and acid-etched substrate...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183641/nanoscale-size-effect-in-in-situ-titanium-based-composites-with-cell-viability-and-cytocompatibility-studies
#16
Andrzej Miklaszewski, Mieczysława U Jurczyk, Mariusz Kaczmarek, Anna Paszel-Jaworska, Aleksandra Romaniuk, Natalia Lipińska, Jakub Żurawski, Paulina Urbaniak, Mieczyslaw Jurczyk
Novel in situ Metal Matrix Nanocomposite (MMNC) materials based on titanium and boron, revealed their new properties in the nanoscale range. In situ nanocomposites, obtained through mechanical alloying and traditional powder metallurgy compaction and sintering, show obvious differences to their microstructural analogue. A unique microstructure connected with good mechanical properties reliant on the processing conditions favour the nanoscale range of results of the Ti-TiB in situ MMNC example. The data summarised in this work, support and extend the knowledge boundaries of the nanoscale size effect that influence not only the mechanical properties but also the studies on the cell viability and cytocompatibility...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28182040/the-effect-of-acrylate-based-dental-adhesive-solvent-content-on-microleakage-in-composite-restorations
#17
Mahboubeh Mirzakhani, Sayed Mostafa Mousavinasab, Mohammad Atai
BACKGROUND: This study aimed to evaluate the effect of different percentages of ethanol solvent of an experimental methacrylate-based dentin bonding agent containing polyhedral oligomeric silsesquioxanes (POSS) on the microleakage of resin composite restorations. MATERIALS AND METHODS: In this experimental study, 42 extracted human premolar teeth used and 84 standard Class V cavities were prepared on the buccal and lingual surfaces of the teeth. The teeth were divided into 6 groups of 7...
November 2016: Dental Research Journal
https://www.readbyqxmd.com/read/28181074/bisphenol-a-concentration-in-human-saliva-related-to-dental-polymer-based-fillings
#18
T L L Berge, G B Lygre, B A G Jönsson, C H Lindh, L Björkman
OBJECTIVES: The aims of this study were to quantify salivary concentrations of bisphenol A (BPA) and to assess if presence of dental composite fillings is associated with higher BPA levels in saliva. MATERIALS AND METHODS: Twenty individuals with six or more tooth surfaces filled with polymer-based dental materials (composite group) and 20 individuals without any polymer-based materials (control group) were included in the study. Saliva was collected in polypropylene tubes and stored at -80 °C before analysis...
February 9, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28179193/light-curing-procedures-performance-knowledge-level-and-safety-awareness-among-dentists
#19
S E Kopperud, H V Rukke, H M Kopperud, E M Bruzell
OBJECTIVES: This study aimed to investigate dentists' exposure to curing light and to obtain information about the dentists' knowledge on practical use and technical features of their curing lights as well as their safety awareness. METHODS: A pre-coded questionnaire was sent electronically to all dentists (n=1313) in the Public Dental Service (PDS) in Norway in 2015. RESULTS: The Response rate was 55.8%. The dentists spent on average 57.5% of their working days placing restorations, ranging from 1 to 30 (mean 7...
February 6, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28174359/discoloration-effects-of-traditional-turkish-beverages-on-different-composite-restoratives
#20
Serdar Baglar, Erol Keskin, Tahir Orun, Abdulhamit Es
AIM: The aim of this study was to evaluate the discoloring effects of five beverages including, especially, traditional Turkish ones on five commonly used dental composites by using a spectrophotometer device. MATERIALS AND METHODS: Five methacrylate-based composites (shade A2) were selected to evaluate their color stability (175 disk samples). Four of them (Filtek Ultimate Universal, Clearfil Majesty ES-2, Tetric EvoCeram, and Cavex Quadrant Universal LC) were nanofilled universal composites for both anterior and posterior restorations, and one (Clearfil Majesty Posterior) was nano-superfilled for posterior restorations...
February 1, 2017: Journal of Contemporary Dental Practice
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