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https://www.readbyqxmd.com/read/29166416/limited-effect-of-cement-material-on-stress-distribution-of-a-monolithic-translucent-zirconia-crown-a-three-dimensional-finite-element-analysis
#1
Sebastian Franco-Tabares, Victoria Franke Stenport, Lars Hjalmarsson, Carina B Johansson
PURPOSE: The literature shows that the performance of densely sintered zirconia single crowns seems to be unaffected by the cement material. The purpose of this study was to evaluate the effects of various cement materials on the stress distribution in a monolithic translucent zirconia crown. MATERIALS AND METHODS: A crown-cement-dentin complex was modeled. Six cements were evaluated: zinc phosphate, glass-ionomer, resin-modified glass-ionomer, dual-cure resin, calcium aluminate-based, and a theoretical or conceptual cement with mechanical properties close to those of dentin (ie, monoblock cement)...
November 22, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29164121/a-pragmatic-study-shows-failure-of-dental-composite-fillings-is-genetically-determined-a-contribution-to-the-discussion-on-dental-amalgams
#2
Alexandre R Vieira, Marília B Silva, Kesia K A Souza, Arnôldo V A Filho, Aronita Rosenblatt, Adriana Modesto
Composite resins for posterior tooth restorations have become a viable alternative to dental amalgam. Failures sometimes cannot be easily explained, and we hypothesize that a genetic component may influence longevity of restorations. We aimed to determine if there is any evidence for a difference in the performance of amalgams versus composite resin in extensive posterior restorations. We also aimed to determine if risk factors such as age, sex, smoking tobacco, alcohol drinking, diabetes status, and periodontal health status may have a role in the failures of extensive anterior composite restorations...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29161950/x-ray-microtomography-assessment-of-carisolv-and-papacarie-effect-on-dentin-mineral-density-and-amount-of-removed-tissue
#3
Jehan AlHumaid, Fahad Al-Harbi, Maha El Tantawi, Abeer Elembaby
OBJECTIVE: The aim of the present study was to directly compare Carisolv and Papacarie regarding the volume of removed tissue (RT) and dentin mineral density (DMD) after excavation. MATERIALS AND METHODS: Twenty permanent molars were randomized into two groups where caries was excavated using Carisolv or Papacarie followed by removal of softened tissue by a blunt instrument. X-ray microtomography was used to scan teeth before and after excavation generating two- and three-dimensional images that were used to calculate the percentage of RT relative to baseline tooth tissue volume and DMD that was categorized into sound dentin (>1...
November 21, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/29161180/comparison-of-verdeluz-orange-g-and-modified-gallego-stains
#4
A Kunche, M A Kiresur, A Ananthaneni, V S Guduru, H K Puneeth, B Bagalad
Tumors of the oral cavity include combinations of hard and soft tissues that may be difficult to identify using routine hematoxylin and eosin (H & E) staining. Although combination stains can demonstrate hard and soft tissues, trichrome stains, such as VanGieson and Masson, cannot differentiate dental hard tissues, such as dentin, cementum and osteoid. Modified Gallegos (MGS) and verdeluz orange G-acid fuchsin (VOF) stains can differentiate components of teeth. We used 10 tissue sections of decalcified bone and 10 pathologic tissue sections that contained different calcified tissues including peripheral ossifying fibroma, odontoma, central ossifying fibroma and cemento-ossifying fibroma...
November 21, 2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/29160917/visualization-of-calcium-phosphate-cement-in-teeth-by-zero-echo-time-1-h-mri-at-high-field
#5
Weiqiang Dou, Simone Mastrogiacomo, Andor Veltien, Hamdan S Alghamdi, X Frank Walboomers, Arend Heerschap
(1) H magnetic resonance imaging (MRI) by a zero echo time (ZTE) sequence is an excellent method to image teeth. Calcium phosphate cement (CPC) materials are applied in the restoration of tooth lesions, but it has not yet been investigated whether they can be detected by computed tomography (CT) or MRI. The aim of this study was to optimize high-field ZTE imaging to enable the visualization of a new CPC formulation implanted in teeth and to apply this in the assessment of its decomposition in vivo. CPC was implanted in three human and three goat teeth ex vivo and in three goat teeth in vivo...
November 21, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/29160402/effect-of-a-bioactive-glass-ceramic-on-the-control-of-enamel-and-dentin-erosion-lesions
#6
Michelle Alexandra Chinelatti, Camila Tirapelli, Silmara Aparecida Milori Corona, Renato Goulart Jasinevicius, Oscar Peitl, Edgar Dutra Zanotto, Fernanda de Carvalho Panzeri Pires-de-Souza
This study evaluated the effect of a bioactive glass ceramic for the control of erosion and caries lesions. Fragments (n=10) of bovine enamel and root dentin received daily application of different treatments (Biosilicate; Acidulated Phosphate Fluoride- APF; Untreated - control) during the performance of erosive cycles. Surfaces were analyzed with 3D optical profilometry to quantify the superficial loss in four periods (1, 7, 14 and 21 days), as well as the lesion depth with confocal laser scanning microscopy...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29160400/microtensile-bond-strength-of-adhesive-systems-in-different-dentin-regions-on-a-class-ii-cavity-configuration
#7
Mário Alexandre Coelho Sinhoreti, Eveline Freitas Soares, Gabriel Flores Abuna, Lourenço Correr, Jean-François Roulet, Saulo Geraldeli
The aim of this study was to evaluate microtensile bond strength (µTBS) of self-etch and etch-and-rinse adhesives systems compared in different dentin regions (central-CD or proximal-PD) in a class II cavity configuration. A class II (mesial-oclusal-distal) cavity configuration was simulated on 20 extracted human third-molars (4 mm wide/3 mm deep). Etch-and-rinse adhesive (Scotchbond Multi Purpose, n=5, SBMP and Optibond FL, n=5, OPFL) and self-etch adhesives (Clearfil SE Bond, n=5, CSE and Optibond XTR, n=5, OPXTR) were applied...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29160181/chick-embryo-model-homing-and-host-interactions-of-tissue-engineering-aimed-human-dental-stem-cells
#8
Jennifer Adriane Dos Santos, Monica Talarico Duailibi, Durvanei Augusto Maria, Sonia Elisabete Alves de Lima Will, Paulo Cesar Simoes Silva, Ligia Ferreira Gomes, Silvio Eduardo Duailibi
Human dental stem cells (hDSC) have a potential for regenerative therapies and could differentiate in vitro into many tissues such as dentin, nerve and vascular endothelium. Gallus gallus domesticus developing fertilized egg, or chick embryo is an experimental model absent of xenografts rejection, largely employed in replacement of mammal species in scientific research and pre-clinical studies to evaluate angiogenesis and vasculogenesis, tissue differentiation, and embryonic development. This multiscale research deals with the homing and cell signaling effects of a standardized hDSC towards the receptor tissues of Gallus gallus domesticus in ovo...
November 21, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29159783/in-vitro-study-of-the-effects-of-denosumab-on-giant-cell-tumor-of-bone-comparison-with-zoledronic-acid
#9
Isao Shibuya, Masamichi Takami, Arei Miyamoto, Akiko Karakawa, Akira Dezawa, Shigeru Nakamura, Ryutaro Kamijo
Giant cell tumor of bone (GCTB) is a locally aggressive primary bone tumor that contains numerous osteoclasts formed from marrow-derived precursors through receptor activator of nuclear factor κ-B ligand (RANKL), an osteoclast differentiation factor expressed in neoplastic cells of GCTB. Denosumab, a fully human monoclonal antibody targeting RANKL, has recently been used for the treatment of GCTB, and superior treatment effects have been reported. The aim of this work was to elucidate the mechanism of action of denosumab, and the differences between denosumab and zoledronic acid at the level of GCTB cells...
November 20, 2017: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/29158384/trunk-neural-crest-origin-of-dermal-denticles-in-a-cartilaginous-fish
#10
J Andrew Gillis, Els C Alsema, Katharine E Criswell
Cartilaginous fishes (e.g., sharks and skates) possess a postcranial dermal skeleton consisting of tooth-like "denticles" embedded within their skin. As with teeth, the principal skeletal tissue of dermal denticles is dentine. In the head, cranial neural crest cells give rise to the dentine-producing cells (odontoblasts) of teeth. However, trunk neural crest cells are generally regarded as nonskeletogenic, and so the embryonic origin of trunk denticle odontoblasts remains unresolved. Here, we use expression of FoxD3 to pinpoint the specification and emigration of trunk neural crest cells in embryos of a cartilaginous fish, the little skate (Leucoraja erinacea)...
November 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29158188/experimental-use-of-an-acrolein-based-primer-as-collagen-cross-linker-for-dentine-bonding
#11
Tatjana Maravic, Lorenzo Breschi, Allegra Comba, Sandra Ribeiro Cunha, Valeria Angeloni, Cesare Nucci, Josimeri Hebling, David Pashley, Franklin Tay, Annalisa Mazzoni
OBJECTIVES: The objective of the present study was to investigate the long-term effect of 0.01% acrolein (ACR) aqueous solution, employed as an additional primer, on the mechanical durability and enzymatic activity of resin-dentine interfaces created with a simplified etch-and-rinse adhesive. METHODS: Dentine surfaces were etched with 35% phosphoric acid for 15sec, rinsed and blot-dried. Specimens were then assigned to: Group 1: dentine pre-treated with 0.01% ACR aqueous solution for 1min and bonded with Adper Scotchbond 1 XT (SB1XT), a 2-step etch-and-rinse adhesive; Group 2: SB1XT was applied on untreated acid-etched dentine (control)...
November 17, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29153956/effect-of-laser-activated-bleaching-on-the-chemical-stability-and-morphology-of-intracoronal-dentin
#12
Fabiane Carneiro Lopes, Renato Roperto, Anna Akkus, Ozan Akkus, Regina Guenka Palma-Dibb, Manoel Damião de Sousa-Neto
OBJECTIVES: To evaluate the effect of the bleaching with 35% hydrogen peroxide either activated or not by a 970nm diode laser on the chemical stability and dentin surface morphology of intracoronary dentin. METHODS: Twenty-seven slabs of intracoronary dentin specimens (3×3mm) were distributed into three groups (n=9), according to surface treatment: HP - 35% hydrogen peroxide (1×4'), DL - 970nm diode laser (1×30"/0,8W/10Hz), HP+DL - 35% HP activated with 970nm diode laser (1×30"/0,8W/10Hz leaving the gel in contact to the surface for 4' after activation)...
November 13, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29153731/bioactivity-of-photoactivated-functionalized-nanoparticles-assessed-in-lipopolysaccharide-contaminated-root-canals-in%C3%A2-vivo
#13
Annie Shrestha, Shimon Friedman, Calvin D Torneck, Anil Kishen
INTRODUCTION: The persistence of dentin-bound lipopolysaccharides (LPS) in disinfected root canals impedes treatment outcomes of endodontic procedures. This study assessed the effects of photoactivated rose bengal-functionalized chitosan nanoparticles (CSRBnps) on LPS-contaminated root dentin in vivo using an intraosseous implantation model and neotissue formation as a marker. METHODS: Fifty human, 3-mm-long root segments with a 1.2-mm canal lumen were divided into 5 groups (n = 10): group 1, canals not contaminated; group 2, canals contaminated with Pseudomonas aeruginosa LPS; group 3, canals contaminated and disinfected with sodium hypochlorite (NaOCl); group 4, canals contaminated and disinfected with NaOCl and calcium hydroxide; and group 5, canals contaminated and disinfected with NaOCl and CSRBnps (300 μg/mL) with photoactivation (λ = 540 nm, 40 J/cm(2))...
November 15, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29152619/dentin-%C3%AE-tbs-and-hardness-of-bulk-fill-and-conventional-composites-placed-in-a-box-shaped-cavity-preparation
#14
Francisca Daniele Jardilino Silame, Gizele de Pádua Geraldeli, Mário Alexandre Coelho Sinhoreti, Fernanda de Carvalho Panzeri Pires-de-Souza, Jean-Francois Roulet, Saulo Geraldeli
PURPOSE: To compare the dentin microtensile bond strength (μTBS) and the Knoop hardness of bulk-fill and conventional restorative composites in box-shaped Class I cavities using different insertion techniques. MATERIALS AND METHODS: Forty box-shaped Class I preparatons 4 mm deep were performed in the pulp chamber of sound human third molars. The restorations were made using either a conventional microhybrid (Z250, 3M ESPE) or bulk-fill (Tetric EvoCeram Bulk-fill, TCBF) composite using two incremental thicknesses: 2 mm or 4 mm (n = 10)...
November 17, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29151196/oral-cancer-radiotherapy-affects-enamel-microhardness-and-associated-indentation-pattern-morphology
#15
R Seyedmahmoud, Y Wang, G Thiagarajan, J P Gorski, R Reed Edwards, J D McGuire, M P Walker
OBJECTIVES: The aim of this study is to determine the effects of in vitro and in vivo high-dose radiotherapy on microhardness and associated indentation pattern morphology of enamel. MATERIALS AND METHODS: The inner, middle, and outer microhardness of enamel was evaluated using three experimental groups: control (non-radiated); in vitro irradiated; in vivo irradiated. In vitro specimens were exposed to simulated radiotherapy, and in vivo specimens were extracted teeth from oral cancer patients previously treated with radiotherapy...
November 18, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29150134/stress-generation-in-mandibular-anterior-teeth-restored-with-different-types-of-post-and-core-at-various-levels-of-ferrule
#16
Anatolii Savychuk, Marianthi Manda, Christos Galanis, Christofer Provatidis, Petros Koidis
STATEMENT OF PROBLEM: Pertinent evidence regarding the mechanical integrity of mandibular anterior teeth restored with a post-and-core is limited. PURPOSE: The purpose of this finite element analysis study was to compare the impact of the post type (glass fiber post-and-resin core or cast post-and-core) along with the ferrule effect on the stress fields generated in endodontically treated mandibular lateral incisors and canines. MATERIAL AND METHODS: Three-dimensional models of the segmented mandible were developed...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29148982/a-dentin-derived-hydrogel-bioink-for-3d-printing-of-cell-laden-scaffolds-for-regenerative-dentistry
#17
Avathamsa Athirasala, Anthony Tahayeri, Greeshma Thrivikraman, Cristiane Miranda Franca, Nelson Monteiro, Victor Tran, Jack Ferracane, Luiz Bertassoni
Recent studies in tissue engineering have adopted extracellular matrix (ECM) derived scaffolds as natural and cytocompatible microenvironments for tissue regeneration. The dentin matrix, specifically, has been shown to be associated with a host of soluble and insoluble signaling molecules that can promote odontogenesis. Here, we have developed a novel bioink, blending printable alginate (3% w/v) hydrogels with the soluble and insoluble fractions of the dentin matrix. We have optimized the printing parameters and the concentrations of the individual components of the bioink for print accuracy, cell viability and odontogenic potential...
November 17, 2017: Biofabrication
https://www.readbyqxmd.com/read/29148914/marginal-gap-formation-in-approximal-bulk-fill-resin-composite-restorations-after-artificial-ageing
#18
A Peutzfeldt, S Mühlebach, A Lussi, S Flury
The aim of this in vitro study was to investigate the marginal gap formation of a packable "regular" resin composite (Filtek Supreme XTE [3M ESPE]) and two flowable "bulk fill" resin composites (Filtek Bulk Fill [3M ESPE] and SDR [DENTSPLY DeTrey]) along the approximal margins of Class II restorations. In each of 39 extracted human molars (n=13 per resin composite), mesial and distal Class II cavities were prepared, placing the gingival margins below the cemento-enamel junction. The cavities were restored with the adhesive system OptiBond FL (Kerr) and one of the three resin composites...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29146302/mechanisms-involved-in-bone-resorption-regulated-by-vitamin-d
#19
REVIEW
Yuko Nakamichi, Nobuyuki Udagawa, Tatsuo Suda, Naoyuki Takahashi
Active forms of vitamin D enhance osteoclastogenesis in vitro and in vivo through the vitamin D receptor (VDR) in osteoblast-lineage cells consisting of osteoblasts and osteocytes. This pro-resorptive activity was evident basically with higher concentrations of active vitamin D than those expected in physiological conditions. Nevertheless, vitamin D compounds have been used in Japan for treating osteoporosis to increase bone mineral density (BMD). Of note, the increase in BMD by long-term treatment with pharmacological (=near-physiological) doses of vitamin D compounds was caused by the suppression of bone resorption...
November 13, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29146046/influence-of-different-smear-layers-on-bond-durability-of-self-etch-adhesives
#20
Toshiki Takamizawa, Wayne W Barkmeier, Keiichi Sai, Akimasa Tsujimoto, Arisa Imai, Robert L Erickson, Mark A Latta, Masashi Miyazaki
OBJECTIVE: The purpose of this study was to determine the influence of different smear layers on enamel and dentin bond durability of various types of self-etch adhesives. METHODS: Two universal adhesives, Scotchbond Universal (SU) and Prime & Bond elect (PE); a conventional single-step self-etch adhesive, G-ænial Bond (GB); and two two-step self-etch adhesives, Optibond XTR (OX) and Clearfil SE Bond (SE) were used in this study. Shear bond strengths (SBS) and shear fatigue strengths (SFS) to human enamel and dentin were determined with different smear layer conditions...
November 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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