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Dental Materials: Official Publication of the Academy of Dental Materials

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https://www.readbyqxmd.com/read/29970234/antimicrobial-photodynamic-active-biomaterials-for-periodontal-regeneration
#1
B W Sigusch, S Dietsch, A Berg, A Voelpel, A Guellmar, U Rabe, M Schnabelrauch, D Steen, B Gitter, V Albrecht, D C Watts, S Kranz
OBJECTIVE: Biomaterials for periodontal regeneration may have insufficient mechanical and antimicrobial properties or are difficult to apply under clinical conditions. The aim of the present study was to develop a polymeric bone grafting material of suitable physical appearance and antimicrobial photodynamic activity. METHODS: Two light curable biomaterials based on urethane dimethacrylate (BioM1) and a tri-armed oligoester-urethane methacrylate (BioM2) that additionally contained a mixture of β-tricalcium phosphate microparticles and 20wt% photosensitizer mTHPC (PS) were fabricated and analyzed by their compressive strength, flexural strength and modulus of elasticity...
June 30, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29960653/hydration-dependent-mechanical-performance-of-denture-adhesive-hydrogels
#2
Fengfeng Zhang, Yiran An, Nima Roohpour, Asa H Barber, Julien E Gautrot
OBJECTIVE: Hydration in denture adhesives regulates the formation of complex morphologies and mechanical function. Multiscale experimental approaches are required to evaluate the impact of hydration on the inherent heterogeneity of denture adhesive-based hydrogels at different length scales and the impact of such phenomena on adhesion performance. METHODS: The morphology of hydrated denture adhesives was examined via cryo-scanning electron microscopy (cryo-SEM)...
June 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29960652/effect-of-high-intensity-curing-lights-on-the-polymerization-of-bulk-fill-composites
#3
Mindy O Daugherty, Wen Lien, Michael R Mansell, Douglas L Risk, Daniel A Savett, Kraig S Vandewalle
OBJECTIVES: The purpose of this study was to investigate the effect of high-irradiance light-curing-units (LCUs) on the depth-of-cure (DoC) and degree-of-polymerization (DoP) of bulk-fill composites (BFCs). METHODS: The DoC of composites (Beautifil-Bulk, SHOFU; Filtek-Bulk-Fill, 3M ESPE; Tetric-EvoCeram-Bulk-Fill, Ivoclar; Sonic-Fill-2, Kerr; Venus-Bulk-Fill, Heraeus; Z250, 3M-ESPE) were measured according to ISO-4049 using high-irradiance LCUs (FlashMax-P3, CMS-Dental; SPEC3, Coltene) and conventional LCU (Paradigm, 3M-ESPE) for exposure times: 3/9-s, 3/20-s, and 10/20-s respectively...
June 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29958680/on-the-systematic-documentation-of-the-structural-characteristics-of-bovine-enamel-a-critic-to-the-protein-sheath-concept
#4
Ezgi D Yilmaz, Jasmin Koldehoff, Gerold A Schneider
The common structural description of bovine enamel used in materials science studies - nano-sized hydroxyapatite crystallites form micron-sized prisms surrounded by protein sheaths, which in turn build a complex decussation pattern - overlook many important morphological information. This hampers the correct interpretation of the data determined by mechanical analysis. For a profound structural description of enamel morphology, the visualization of its building blocks by high-resolution electron microscopy and focused-ion beam tomography technique, which reveals their form, orientation and configuration at different regions of a tooth (cut in different directions), is undertaken in this work...
June 26, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29945798/should-adhesive-debonding-be-simulated-for-intra-radicular-post-stress-analyses
#5
Ricardo A Caldas, Atais Bacchi, Valentim A R Barão, Antheunis Versluis
OBJECTIVE: Elucidate the influence of debonding on stress distribution and maximum stresses for intra-radicular restorations. METHODS: Five intra-radicular restorations were analyzed by finite element analysis (FEA): MP=metallic cast post core; GP=glass fiber post core; PP=pre-fabricated metallic post core; RE=resin endocrowns; CE=single piece ceramic endocrown. Two cervical preparations were considered: no ferule (f0 ) and 2mm ferule (f1 ). The simulation was conducted in three steps: (1) intact bonds at all contacts; (2) bond failure between crown and tooth; (3) bond failure among tooth, post and crown interfaces...
June 23, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29945797/impact-of-crystallization-firing-process-on-the-microstructure-and-flexural-strength-of-zirconia-reinforced-lithium-silicate-glass-ceramics
#6
Hilton Riquieri, Jaiane Bandoli Monteiro, Diogo Cabecinha Viegas, Tiago Moreira Bastos Campos, Renata Marques de Melo, Guilherme de Siqueira Ferreira Anzaloni Saavedra
OBJECTIVES: The aim of this study was to characterize the microstructure of two zirconia-reinforced lithium silicate (ZLS) glass-ceramics and evaluate their mechanical properties before and after the crystallization firing process (CFP). METHODS: Field emission-scanning electron microscope (FE-SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses were performed for microstructural characterization. To evaluate the pattern of crystallization and the molecular composition of ZLS glass-ceramics, was used X-ray diffraction (XRD)...
June 23, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29941352/experimental-tricalcium-silicate-cement-induces-reparative-dentinogenesis
#7
Xin Li, Mariano Simón Pedano, Bernardo Camargo, Esther Hauben, Stéphanie De Vleeschauwer, Zhi Chen, Jan De Munck, Katleen Vandamme, Kirsten Van Landuyt, Bart Van Meerbeek
OBJECTIVES: To overcome shortcomings of hydraulic calcium-silicate cements (hCSCs), an experimental tricalcium silicate (TCS) cement, named 'TCS 50', was developed. In vitro research showed that TCS 50 played no negative effect on the viability and proliferation of human dental pulp cells, and it induced cell odontogenic differentiation. The objective was to evaluate the pulpal repair potential of TCS 50 applied onto exposed minipig pulps. METHODS: Twenty permanent teeth from three minipigs were mechanically exposed and capped using TCS 50; half of the teeth were scheduled for 7-day and the other half for 70-day examination (n=10)...
June 22, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29941351/correlation-of-resin-viscosity-and-monomer-conversion-to-filler-particle-size-in-dental-composites
#8
Eric Habib, Ruili Wang, X X Zhu
OBJECTIVE: The viscosity of dental resin composites is important in their formulation and clinical use; it depends on the filler particle size and loading. We intend to study the viscosity and conversion of composites made of low dispersity spherical silica fillers. METHODS: Experimental dental resin composites were formulated using low dispersity spherical silica particles of graded sizes (75, 150, 500, 350, 500, 1000nm) at several loading levels with resins based on Bis-GMA and UDMA...
June 22, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29941350/in-vitro-degradation-of-a-biodegradable-polylactic-acid-magnesium-composite-as-potential-bone-augmentation-material-in-the-presence-of-titanium-and-peek-dental-implants
#9
Tycho Zimmermann, Ana Ferrandez-Montero, Marcela Lieblich, Begoña Ferrari, José Luis González-Carrasco, Wolf-Dieter Müller, Andreas Dominik Schwitalla
OBJECTIVE: The aim of this study was to assess the degradation behavior by measuring the H2 release of a biodegradable composite consisting of a polylactic acid matrix reinforced with 30% wt. spherical magnesium microparticles (PLA/Mg) as potential bone augmentation material in combination with dental implants of either titanium or polyetheretherketone (PEEK) in order to evaluate the potential influence of the titanium dental implants on the corrosion behavior of the Mg particles within the PLA matrix...
June 22, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29941349/post-curing-in-dental-resin-based-composites
#10
William Germscheid, Louis Gosse de Gorre, Braden Sullivan, Catherine O'Neill, Richard B Price, Daniel Labrie
OBJECTIVE: To determine the post-curing in six commercial contemporary resin-based composites (RBCs) using axial shrinkage, the degree of conversion, and Vickers hardness. METHODS: Five Bulk Fill and one conventional RBCs from three companies were selected with a wide range of filler volume content. The axial shrinkage of samples that were 1.00mm thick by 9-10mm diameter was measured using a modified bonded disk method over a time between 15h and 19h at temperatures of 26°C and 34°C (mouth temperature)...
June 22, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29937333/effect-of-an-acidic-sodium-salt-on-the-polymerization-behavior-of-self-adhesive-resin-cements-formulated-with-different-adhesive-monomers
#11
Pedro Paulo Albuquerque Cavalcanti de Albuquerque, Ezequias Costa Rodrigues, Luis Felipe Schneider, Rafael Ratto Moraes, Paulo Francisco Cesar, Leonardo Eloy Rodrigues Filho
OBJECTIVE: To determine the influence of benzenesulfinic acid sodium salt 98% (BAS) and the activation mode on the polymerization behavior of experimental self-adhesive resin cements (SARCs) formulated with distinct self-etch methacrylates. MATERIALS AND METHODS: Three catalyst-pastes using different self-etch methacrylates (2MP - bis 2-(methacryloyloxy) ethyl phosphate; 4META - 4-methacryloxyethyl trimellitic acid anhydride; and GDMAP - 1,3-glycerol dimethacrylate phosphate) and four base-pastes were formulated from the incorporation of different amounts of BAS associated to N-N-dihydroxyethyl-p-toluidine (DHPT)...
June 21, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29937332/an-analytical-model-to-design-circumferential-clasps-for-laser-sintered-removable-partial-dentures
#12
Ammar A Alsheghri, Omar Alageel, Eric Caron, Ovidiu Ciobanu, Faleh Tamimi, Jun Song
OBJECTIVE: Clasps of removable partial dentures (RPDs) often suffer from plastic deformation and failure by fatigue; a common complication of RPDs. A new technology for processing metal frameworks for dental prostheses based on laser-sintering, which allows for precise fabrication of clasp geometry, has been recently developed. This study sought to propose a novel method for designing circumferential clasps for laser-sintered RPDs to avoid plastic deformation or fatigue failure. METHODS: An analytical model for designing clasps with semicircular cross-sections was derived based on mechanics...
June 21, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29935769/endocrown-restorations-influence-of-dental-remnant-and-restorative-material-on-stress-distribution
#13
João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Camila Ferreira Leite Madruga, Marcia Carneiro Valera, Alexandre Luiz Souto Borges, Eduardo Bresciani, Renata Marques de Melo
OBJECTIVE: The goal of this study was to evaluate the stress distribution in a tooth/restoration system according to the factors "amount of dental remnant" (3 levels) and "restorative material" (2 levels). METHODS: Three endodontically treated maxillary molars were modeled with CAD software for conducting non-linear finite element analysis (FEA), each with a determined amount of dental remnant of 1.5, 3, or 4.5mm. Models were duplicated, and half received restorations in lithium disilicate (IPS e...
June 20, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29935768/influence-of-different-low-pressure-plasma-process-parameters-on-shear-bond-strength-between-veneering-composites-and-peek-materials
#14
Friederike Bötel, Tycho Zimmermann, Mona Sütel, Wolf-Dieter Müller, Andreas Dominik Schwitalla
OBJECTIVE: The aim of this study was to evaluate the impact of oxygen and argon/oxygen low-pressure plasma on the shear bond strength (SBS) between dental PEEK compounds and veneering composites as a function of plasma process time. METHODS: Of an unfilled PEEK ("Juvora") and two pigment powder filled PEEK compounds ("DC4420", "DC4450"), 273 rectangular plates were prepared and polished up to 1200 grit. Afterwards the samples were sandblasted and randomly assigned to five different surface pre-treatment groups (1...
June 20, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29935767/influence-of-fluoride-on-the-mineralization-of-collagen-via-the-polymer-induced-liquid-precursor-pilp-process
#15
Neha Saxena, Maegan A Cremer, Evan S Dolling, Hamid Nurrohman, Stefan Habelitz, Grayson W Marshall, Laurie B Gower
OBJECTIVE: The polymer-induced liquid-precursor (PILP) mineralization process has been shown to remineralize artificial dentin lesions to levels consistent with those of native dentin. However, nanoindentation revealed that the moduli of those remineralized lesions were only ∼50% that of native dentin. We hypothesize that this may be due to the PILP process having been previously optimized to obtain high amounts (∼70wt%) of intrafibrillar crystals, but without sufficient interfibrillar mineral, another significant component of dentin...
June 20, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29935766/novel-magnetic-nanoparticle-containing-adhesive-with-greater-dentin-bond-strength-and-antibacterial-and-remineralizing-capabilities
#16
Yuncong Li, Xiaoyi Hu, Yang Xia, Yadong Ji, Jianping Ruan, Michael D Weir, Xiaoying Lin, Zhihong Nie, Ning Gu, Radi Masri, Xiaofeng Chang, Hockin H K Xu
OBJECTIVES: A nanoparticle-doped adhesive that can be controlled with magnetic forces was recently developed to deliver drugs to the pulp and improve adhesive penetration into dentin. However, it did not have bactericidal and remineralization abilities. The objectives of this study were to: (1) develop a magnetic nanoparticle-containing adhesive with dimethylaminohexadecyl methacrylate (DMAHDM), amorphous calcium phosphate nanoparticles (NACP) and magnetic nanoparticles (MNP); and (2) investigate the effects on dentin bond strength, calcium (Ca) and phosphate (P) ion release and anti-biofilm properties...
June 20, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29934126/effect-of-thiourethane-filler-surface-functionalization-on-stress-conversion-and-mechanical-properties-of-restorative-dental-composites
#17
André L Faria-E-Silva, Andressa Dos Santos, Angela Tang, Emerson M Girotto, Carmem S Pfeifer
OBJECTIVES: This study evaluated the efficacy of a thiourethane(TU)-modified silane agent in improving properties in filled composites. METHODS: The TU-silane agent was synthesized by combining 1,3-bis(1-isocyanato-1-methylethyl)benzene and 3-(triethoxysilyl)propyl isocyanate with trimethylol-tris-3-mercaptopropionate (TMP), at 1:2 isocyanate:thiol, leaving pendant thiol and alkoxy silane groups. Barium glass fillers (1μm average particle size) were functionalized with 5wt% TU-silane in an acidic ethanol solution...
June 19, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29934125/cad-fea-modeling-and-analysis-of-different-full-crown-monolithic-restorations
#18
Amanda Maria de Oliveira Dal Piva, João Paulo Mendes Tribst, Alexandre Luiz Souto Borges, Rodrigo Othávio de Assunção E Souza, Marco Antonio Bottino
OBJECTIVES: To investigate the influence of different materials for monolithic full posterior crowns using 3D-Finite Element Analysis (FEA). METHODS: Twelve (12) 3D models of adhesively-restored teeth with different crowns according to the material and its elastic modulus were analysed: Acrylic resin, Polyetheretherketone, Composite resin, Hybrid ceramic, pressable and machinable Zirconia reinforced lithium silicate, Feldspathic, Lithium disilicate, Gold alloy, Cobalt-Chromium alloy (Co-Cr), Zirconia tetragonal partially stabilized with yttria, and Alumina...
June 19, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29934124/fatigue-behavior-of-ultrafine-tabletop-ceramic-restorations
#19
F O Abu-Izze, G F Ramos, A L S Borges, L C Anami, M A Bottino
OBJECTIVE: The goal of this study was to investigate the fatigue life, failure modes, and stress distribution of partial ultrafine restorations for posterior teeth in different ceramics. METHODS: Sixty standard tabletop preparations in epoxy resin G10 received lithium-silicate-based zirconia-reinforced (ZLS) or hybrid ceramic (PIC) restorations in 0.5- or 1-mm thickness bonded with resin cement. The same cycling protocol was applied for all specimens, which consisted of 5000 cycles at 200N, followed by 450-N cycles until the specimens' fracture or the suspension of the test after 1...
June 19, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29929846/development-of-an-oxirane-acrylate-interpenetrating-polymer-network-ipn-resin-system
#20
Robert Danso, Blake Hoedebecke, Kyumin Whang, Shayda Sarrami, Allen Johnston, Sam Flipse, Nancy Wong, H Ralph Rawls
OBJECTIVE: Develop a hydrophobic, degradation-resistant dental restorative based on an Oxirane-Acrylate IPN System (OASys) with low shrinkage-stress to substantially extend clinical lifetime. METHODS: Unfilled OASys blends were prepared using dipenta-erythritol-hexaacrylate (DPHA) and p-cycloaliphatic-diepoxide (EP5000). Varying proportions of camphorquinone/iodonium photoinitiator, with a co-reactant oligomeric-diol, served as the experimental curing system. The effects of oxirane-acrylate ratio on the degree-of-cure (Durometer-D hardness), hydrophobicity (contact angle), mechanical properties (3-point bending), near-infrared FTIR degree-of-conversion (DoC), polymerization shrinkage, and shrinkage stress were determined...
June 18, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
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