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https://www.readbyqxmd.com/read/29042725/the-effect-of-polymerization-and-preparation-techniques-on-the-microleakage-of-composite-laminate-veneers
#1
Neslihan Celik, Merve Iscan Yapar, Numan Taşpınar, Nilgun Seven
BACKGROUND: Marginal leakage is the important factor influencing the maintenance of dental esthetic. AIM: The purpose of this study was to evaluate the relationship between the preparation techniques and type of polymerization techniques on microleakage of composite laminate veneers. MATERIALS AND METHODS: Ninety-one same sized, caries-free human maxillary central incisors were randomly assigned to 13 groups (n = 7) and were designed with four different preparation techniques (window type, feather type, bevel type, and incisal overlap type)...
July 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29042079/cytotoxicity-and-dna-double-strand-breaks-in-human-gingival-fibroblasts-exposed-to-eluates-of-dental-composites
#2
Yang Yang, Franz-Xaver Reichl, Jianwei Shi, Xiuli He, Reinhard Hickel, Christof Högg
OBJECTIVE: Previously, single composite components were used to study cytotoxicity and induction of DNA double-strand breaks (DNA-DSBs) of dental composite resins. In the present study, cytotoxicity and induction of DNA-DSBs in human gingival fibroblasts (HGFs) were investigated with dental composite eluates consisting of multiple components. The eluates were qualified and quantified. METHODS: The composites Esthet.X(®) HD, Venus(®), X-tra fil(®), CLEARFIL™ AP-X, Admira(®) Fusion and QuiXfil(®) were polymerized and immersed into Dulbecco's modified Eagle's medium (DMEM) for 72h...
October 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29042078/bioactivity-and-fluoride-release-of-strontium-and-fluoride-modified-biodentine
#3
Hazel O Simila, Natalia Karpukhina, Robert G Hill
Biodentine™ is a novel tricalcium silicate based material used both as a coronal dentine replacement and in pulp therapy. Its multiple use in sealing perforations, pulp capping and as a temporary restoration arises from its ability to promote dentine formation and to confer an excellent marginal seal. However, there is still room for improvement of this cement as it lacks the anticariogenic effect typically conferred by fluoride ion release as seen in glass ionomer cement based dental materials. Therefore, this study was conducted to investigate the impact of bioactive glass addition to Biodentine™...
October 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29040132/a-call-for-standardization-in-platelet-rich-plasma-preparation-protocols-and-composition-reporting-a-systematic-review-of-the-clinical-orthopaedic-literature
#4
Jorge Chahla, Mark E Cinque, Nicolas S Piuzzi, Sandeep Mannava, Andrew G Geeslin, Iain R Murray, Grant J Dornan, George F Muschler, Robert F LaPrade
BACKGROUND: Platelet-rich plasma (PRP) is a blood-derived preparation whose use has grown exponentially in orthopaedic practice. However, there remains an unclear understanding of the biological properties and effects of PRP on musculoskeletal healing. Heterogeneous processing methods, unstandardized nomenclature, and ambiguous classifications make comparison among studies challenging. A comprehensive assessment of orthopaedic clinical PRP trials is key to unraveling the biological complexity of PRP, while improving standardized communication...
October 18, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29039617/the-electrical-properties-and-glass-transition-of-some-dental-materials-after-temperature-exposure
#5
Agnieszka Marcinkowska, Marlena Gauza-Wlodarczyk, Leszek Kubisz, Wieslaw Hedzelek
The physicochemical properties of dental materials will remain stable only when these materials in question are resistant to the changes in the oral cavity. The oral environment is subject to large temperature variations. The aim of the study was the assessment of electrical properties and glass transition of some dental materials after temperature exposure. Composite materials, compomers, materials for temporary prosthetic replacement and resin-based pit and fissure sealants were used in the study. The method used was electric conductivity of materials under changing temperature...
October 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29037476/zirconia-incorporated-zinc-oxide-eugenol-has-improved-mechanical-properties-and-cytocompatibility-with-human-dental-pulp-stem-cells
#6
Soo Kyung Jun, Hae-Won Kim, Hae-Hyoung Lee, Jung-Hwan Lee
OBJECTIVE: Zinc oxide eugenol (ZOE) is widely used as a therapeutic dental restorative material. However, ZOE has poor mechanical properties and high cytotoxicity toward human dental pulp stem cells (hDPSCs) due to the release of Zn ions. In this study, zirconia-incorporated ZOE (ZZrOE) was developed to reduce the cytotoxicity and improve the mechanical properties of ZOE with sustained therapeutic effects on inflamed hDPSCs in terms of inflammatory gene expression levels compared with those of the original material...
October 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29037413/extant-ape-dental-topography-and-its-implications-for-reconstructing-the-emergence-of-early-homo
#7
Michael A Berthaume, Kes Schroer
Dental topography reflects diet accurately in several extant and extinct mammalian clades. However, dental topographic dietary reconstructions have high success rates only when closely related taxa are compared. Given the dietary breadth that exists among extant apes and likely existed among fossil hominins, dental topographic values from many species and subspecies of great apes are necessary for making dietary inferences about the hominin fossil record. Here, we present the results of one metric of dental topography, Dirichlet normal energy (DNE), for seven groups of great apes (Pongo pygmaeus pygmaeus, Pan paniscus, Pan troglodytes troglodytes and schweinfurthii, Gorilla gorilla gorilla, Gorilla beringei graueri and beringei)...
November 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/29031995/comparison-of-deproteinization-agents-on-bonding-to-developmentally-hypomineralized-enamel
#8
Manikandan Ekambaram, Robert P Anthonappa, Sharaschandra R Govindool, Cynthia Ky Yiu
OBJECTIVE: To compare bonding of dental adhesive to hypomineralized enamel (HE) after pre-treatment with either 5% sodium hypochlorite (NaOCl) solution or papain-based papacarie gel. METHODS: Normal enamel (NE) and HE obtained from hypomineralized first permanent molars were acid-etched with 32% phosphoric acid and randomly allocated into no deproteinization, deproteinization using 5% NaOCl, or deproteinization usping papacarie gel groups. Subsequently, the specimens were bonded, packed with composite resins and subjected to micro-shear bond strength (MSBS) testing and the data analysed using 2-way ANOVA and Tukey tests...
October 11, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29029848/fluoride-containing-bioactive-glass-composite-for-orthodontic-adhesives-ion-release-properties
#9
N A Al-Eesa, F S L Wong, A Johal, R G Hill
OBJECTIVE: Dental materials that release calcium, phosphate and fluoride ions could prevent demineralisation and/or enhance remineralisation of enamel. The objective was to develop a novel bioactive glass (BAG) resin and investigate pH changes and ion release in 3 immersion media. METHODS: Quench melt derived BAG (35.25% SiO2, 6% Na2O, 43% CaO, 5.75% P2O5, and 10% CaF2) was incorporated into a resin (42.25% BisEMA, 55% TEGDMA, 0.25% DMAEM, 0.5% camphorquinone and 2% 4-Meta), with a filler load of 80% by weight...
October 10, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29028598/a-particle-swarm-based-algorithm-for-optimization-of-multi-layered-and-graded-dental-ceramics
#10
Ehsan Askari, Paulo Flores, Filipe Silva
The thermal residual stresses (TRSs) generated owing to the cooling down from the processing temperature in layered ceramic systems can lead to crack formation as well as influence the bending stress distribution and the strength of the structure. The purpose of this study is to minimize the thermal residual and bending stresses in dental ceramics to enhance their strength as well as to prevent the structure failure. Analytical parametric models are developed to evaluate thermal residual stresses in zirconia-porcelain multi-layered and graded discs and to simulate the piston-on-ring test...
October 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29028596/synthesis-characterization-and-evaluation-of-a-fluorinated-resin-monomer-with-low-water-sorption
#11
Xue Liu, Zengyao Wang, Chengji Zhao, Wenhuan Bu, Yurong Zhang, Hui Na
A fluorinated acrylate monomer (4-TF-PQEA) without BPA (bisphenol-A) structure was synthesized and mixed with triethylene glycol dimethacrylate (TEGDMA) to used as dental resin system in order to achieve lower water sorption and reduce human exposure to BPA derivatives. Double bond conversion (DC) was measured using Fourier transform infrared spectroscopy (FTIR). Water sorption (WS), water solution (WL) and depth of cure (DOC) were evaluated according to ISO 4049:2009. Water contact angle (CA) was measured using contact angle analyzer...
September 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29020664/shrinkage-vectors-of-a-flowable-composite-in-artificial-cavity-models-with-different-boundary-conditions-ceramic-and-teflon
#12
Dalia Kaisarly, Moataz El Gezawi, Xiaohui Xu, Peter Rösch, Karl-Heinz Kunzelmann
Polymerization shrinkage of dental resin composites leads to stress build-up at the tooth-restoration interface that predisposes the restoration to debonding. In contrast to the heterogeneity of enamel and dentin, this study investigated the effect of boundary conditions in artificial cavity models such as ceramic and Teflon. Ceramic serves as a homogenous substrate that provides optimal bonding conditions, which we presented in the form of etched and silanized ceramic in addition to an etched, silanized and bonded ceramic cavity...
October 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28993220/silk-fibroin-hydroxyapatite-composites-for-bone-tissue-engineering
#13
REVIEW
Mehdi Farokhi, Fatemeh Mottaghitalab, Saeed Samani, Mohammad Ali Shokrgozar, Subhas C Kundu, Rui L Reis, Yousef Fattahi, David L Kaplan
Silk fibroin (SF) is a natural fibrous polymer with strong potential for many biomedical applications. SF has attracted interest in the field of bone tissue engineering due to its extraordinary characteristics in terms of elasticity, flexibility, biocompatibility and biodegradability. However, low osteogenic capacity has limited applications for SF in the orthopedic arena unless suitably functionalized. Hydroxyapatite (HAp) is a well-established bioceramic with biocompatibility and appropriate for constructing orthopedic and dental substitutes...
October 6, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28987501/composite-alginate-hyaluronan-sponges-for-the-delivery-of-tranexamic-acid-in-post-extractive-alveolar-wounds
#14
Ovidio Catanzano, Vittoria D'Esposito, Pietro Formisano, Joshua S Boateng, Fabiana Quaglia
The management of wounds in patients on anticoagulant therapy who require oral surgical procedures is problematic and often results in a non-satisfactory healing process. Here we report a method to prepare an advanced dressing able to avoid uncontrolled bleeding by occluding the post-extractive alveolar wounds, and simultaneously, capable of a fast release of tranexamic acid (TA). Composite alginate/hyaluronan (ALG/HA) sponge dressings loaded with TA were prepared by a straightforward internal gelation method followed by a freeze-drying step...
October 5, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28979798/metagenomic-and-metatranscriptomic-analysis-of-saliva-reveals-disease-associated-microbiota-in-patients-with-periodontitis-and-dental-caries
#15
Daniel Belstrøm, Florentin Constancias, Yang Liu, Liang Yang, Daniela I Drautz-Moses, Stephan C Schuster, Gurjeet Singh Kohli, Tim Holm Jakobsen, Palle Holmstrup, Michael Givskov
The taxonomic composition of the salivary microbiota has been reported to differentiate between oral health and disease. However, information on bacterial activity and gene expression of the salivary microbiota is limited. The purpose of this study was to perform metagenomic and metatranscriptomic characterization of the salivary microbiota and test the hypothesis that salivary microbial presence and activity could be an indicator of the oral health status. Stimulated saliva samples were collected from 30 individuals (periodontitis: n = 10, dental caries: n = 10, oral health: n = 10)...
2017: NPJ Biofilms and Microbiomes
https://www.readbyqxmd.com/read/28979574/comparison-of-composition-and-anticaries-effect-of-galla-chinensis-extracts-with-different-isolation-methods
#16
Xuelian Huang, Meng Deng, Mingdong Liu, Lei Cheng, R A M Exterkate, Jiyao Li, Xuedong Zhou, Jacob M Ten Cate
OBJECTIVES: Galla chinensis water extract (GCE) has been demonstrated to inhibit dental caries by favorably shifting the demineralization/remineralization balance of enamel and inhibiting the biomass and acid formation of dental biofilm. The present study focused on the comparison of composition and anticaries effect of Galla chinensis extracts with different isolation methods, aiming to improve the efficacy of caries prevention. METHODS: The composition of water extract (GCE), ethanol extract (eGCE) and commercial tannic acid was compared...
2017: Open Dentistry Journal
https://www.readbyqxmd.com/read/28976846/polymerization-behavior-and-mechanical-properties-of-high-viscosity-bulk-fill-and-low-shrinkage-resin-composites
#17
S Shibasaki, T Takamizawa, K Nojiri, A Imai, A Tsujimoto, H Endo, S Suzuki, S Suda, W W Barkmeier, M A Latta, M Miyazaki
The present study determined the mechanical properties and volumetric polymerization shrinkage of different categories of resin composite. Three high viscosity bulk fill resin composites were tested: Tetric EvoCeram Bulk Fill (TB, Ivoclar Vivadent), Filtek Bulk Fill posterior restorative (FB, 3M ESPE), and Sonic Fill (SF, Kerr Corp). Two low-shrinkage resin composites, Kalore (KL, GC Corp) and Filtek LS Posterior (LS, 3M ESPE), were used. Three conventional resin composites, Herculite Ultra (HU, Kerr Corp), Estelite ∑ Quick (EQ, Tokuyama Dental), and Filtek Supreme Ultra (SU, 3M ESPE), were used as comparison materials...
October 4, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28972882/immediate-reconstruction-of-failed-implants-in-the-esthetic-zone-using-a-flapless-technique-and-autogenous-composite-tuberosity-graft
#18
Gerry M Raghoebar, Henny J A Meijer, Baucke van Minnen, Arjan Vissink
We describe a technique for immediate reconstruction of bone after removal of failed dental implants in the esthetic region to optimize the esthetic outcome of retreatment. We conducted a study of 16 consecutive patients in whom the bony defect resulting from implant removal was immediately reconstructed with a combined autogenous bone and soft tissue graft harvested from the maxillary tuberosity. After a healing period of 3 months, implants were inserted. At 1 year after placement of the definitive restoration, no implants had been lost, the peri-implant tissues were healthy, the aesthetics scored with the pink esthetic score were favorable, and the patients were satisfied...
September 11, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28971532/new-bone-formation-and-trabecular-bone-microarchitecture-of-highly-porous-tantalum-compared-to-titanium-implant-threads-a-pilot-canine-study
#19
Jin Whan Lee, Hai Bo Wen, Prabhu Gubbi, Georgios E Romanos
AIM: This study evaluated new bone formation activities and trabecular bone microarchitecture within the highly porous region of Trabecular Metal™ Dental Implants (TM) and between the threads of Tapered Screw-Vent® Dental Implants (TSV) in fresh canine extraction sockets. MATERIALS AND METHODS: Eight partially edentulated dogs received four implants (4.1 mmD × 13 mmL) bilaterally in mandibular fresh extraction sockets (32 TM, 32 TSV implants), and allowed to heal for 2, 4, 8, and 12 weeks...
October 2, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28969848/silane-adhesion-mechanism-in-dental-applications-and-surface-treatments-a-review
#20
REVIEW
Jukka Pekka Matinlinna, Christie Ying Kei Lung, James Kit Hon Tsoi
OBJECTIVE: To give a current review of silane adhesion chemistry, applications of silane coupling agents and related surface pretreatment methods in contemporary dentistry. METHODS: Silane coupling agents are adhesion promoters to chemically unify dissimilar materials used in dentistry. Silanes are very effective in adhesion promotion between resin composites and silica-based or silica-coated indirect restorative materials. It is generally accepted that for non-silica-based restorations, surface pretreatment is a mandatory preliminary step to increase the silica content and then, with help of silane, improve resin bonding...
September 29, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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