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Dental Materials: Official Publication of the Academy of Dental Materials

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https://www.readbyqxmd.com/read/30220508/effect-of-aging-and-testing-method-on-bond-strength-of-cad-cam-fiber-reinforced-composite-to-dentin
#1
Lucas Fracassi de Oliveira Lino, Camila Moreira Machado, Vitor Guarçoni de Paula, Hugo Alberto Vidotti, Paulo G Coelho, Ernesto Byron Benalcázar Jalkh, Thiago Amadei Pegoraro, Estevam Augusto Bonfante
OBJECTIVES: To evaluate and compare the outcomes of shear (S) and microtensile (μT) bond strength tests of CAD/CAM fiber-reinforced composite (FRC) to dentin. Aging with either fatigue or thermocycling were conducted for comparison with baseline microtensile group. METHODS: CAD/CAM FRC (Trinia, Bicon LLC, Boston, USA) blocks were milled to 3-mm diameter cylinders for shear and to blocks (5×5×5mm) for μT. Sixty extracted human molars were flattened to obtain dentin surfaces and randomly divided in four groups (n=15): (1) SC: samples tested in shear 24h after bonding; (2) μTC: samples tested in μT 24h after bonding); (3) μTF: samples submitted to mechanical fatigue prior to μT test, and; (4) μTT: thermocycling prior to μT test...
September 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30220507/multifaceted-roles-of-environmental-factors-toward-dental-implant-performance-observations-from-clinical-retrievals-and-in-vitro-testing
#2
Sathyanarayanan Sridhar, Frederick Wang, Thomas G Wilson, Pilar Valderrama, Kelli Palmer, Danieli C Rodrigues
OBJECTIVE: Oral bacteria and periodontal pathogen have been predominantly linked with early- and late- stage failures of titanium (Ti) dental implants (DI) respectively. This study is based on the hypothesis that bacterial colonization can damage the surface oxide (TiO2 ) layer. Early-failed DI were compared with DI post-in vitro immersion in early colonizing oral bacteria; late failed DI were weighed against DI immersed in late colonizing anaerobic pathogens. METHODS: Retrieval analysis: Seven early- stage failed implants with five of them connected to healing abutments (HAs), and ten late- stage failed retrievals were subjected to surface analysis...
September 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30220506/biofilm-formation-on-restorative-materials-and-resin-composite-cements
#3
Monika Astasov-Frauenhoffer, Stephanie Glauser, Jens Fischer, Fredy Schmidli, Tuomas Waltimo, Nadja Rohr
OBJECTIVES: Monolithic zirconia, polymer-infiltrated ceramic and acrylate polymer cemented with resin composite cement have recently been identified as prosthetic treatment options for zirconia implants. The aim of the present study is to determine in vitro, to what extent bacteria adhere to these materials. METHODS: Disks made of zirconia (Vita YZ [YZ]), polymer-infiltrated ceramic (Vita Enamic [VE]), acrylate polymer (Vita CAD-Temp [CT]), self-adhesive cement (RelyX Unicem 2 Automix [RUN]) and of two different adhesive cements (RelyX Ulimate [RUL] and Vita Adiva F-Cem [VAF]) were produced...
September 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30220505/effect-of-loading-frequency-on-cyclic-fatigue-lifetime-of-a-standard-diameter-implant-with-an-internal-abutment-connection
#4
Yuanyuan Duan, Jason A Griggs
OBJECTIVE: To investigate the effect of loading frequency on the fatigue lifetime of one standard-diameter titanium dental implant system. METHODS: Thirty-six titanium dental implant specimens (Bone Level RC, Straumann) were assembled following manufacturer's instructions and torqued into cylindrical holder blocks following the apparatus specified by the ISO 14801 test standard. Stainless steel loading hemispheres were bonded on the abutments with a moment arm of 11mm...
September 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30219594/ftir-characterization-of-the-setting-reaction-of-biodentine%C3%A2
#5
J Alotaibi, S Saji, M V Swain
OBJECTIVE: To provide insight of the setting reactions of Biodentine™, a hydraulic calcium silicate cement, based upon observations using Fourier Transform Infra-Red (FTIR) spectroscopy. METHODS: FTIR spectra of components before and during the setting reaction were taken using the attenuated total reflectance (ATR) technique. Measurements over wavelengths 600-4000cm-1 were taken at regular intervals for two days. RESULTS: FTIR spectrum of Biodentine™ powder revealed a number of peaks from 650 to 1100cm-1 and a plateau from 1400 to 1500cm-1 , indicative of SiO and CO3 -bonding, while the mixing fluid exhibited water peaks...
September 12, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30213524/influence-of-light-cured-luting-agents-and-associated-factors-on-the-color-of-ceramic-laminate-veneers-a-systematic-review-of-in-vitro-studies
#6
REVIEW
Ana Paula Perroni, Marina R Kaizer, Alvaro Della Bona, Rafael R Moraes, Noéli Boscato
OBJECTIVE: The luting agent plays a significant role in the appearance of ceramic laminate veneers (CLV), allowing improved/stable shade matching with adjacent teeth. A systematic review was conducted to investigate the influence of light-cured luting agents and color-associated factors aiming to draw guidelines for stable shade matching of CLV. The paper has also given an overview of the compositional characteristics of all luting agents and ceramic systems whose performance was presented herein...
September 10, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30201287/modulating-ph-through-lysine-integrated-dental-adhesives
#7
Linyong Song, Xueping Ge, Qiang Ye, Kyle Boone, Sheng-Xue Xie, Anil Misra, Candan Tamerler, Paulette Spencer
OBJECTIVES: The objective of this study was to explore the effect of lysine integration to dental adhesives with respect to the polymerization kinetics, neutralization capacities in the acidic microenvironment, dynamic mechanical properties, and thermal properties. MATERIALS AND METHOD: Lysine was incorporated into liquid resin formulations at 2.5 and 5.0wt % with additional water/ethanol co-solvents. The co-monomer system contained 2-hydroxyethyl-methacrylate (HEMA) and Bisphenol A glycerolate dimethacrylate (BisGMA) with a mass ratio of 45/55...
September 7, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30201286/functionalized-epigallocatechin-gallate-copolymer-inhibit-dentin-matrices-degradation-mechanical-solubilized-telopeptide-and-proteomic-assays
#8
Anuradha Prakki, Yaoyang Xiong, Janaína Bortolatto, Lucélia Lemes Gonçalves, Arwa Bafail, Greg Anderson, Alexander Terry Stavroullakis
OBJECTIVES: We investigated the biostability of dentin organic matrices treated with epigallocatechin gallate (EGCG) in comparison to chlorhexidine (CHX), both extracted from functionalized copolymers. METHODS: Copolymers were prepared with bis-GMA:TEGDMA and incorporated with 1% of EGCG or CHX (w/w). Blank copolymers were used as control. Copolymer samples were individually stored in 1mL deionized water to produce copolymer extracts. Dentin matrices were obtained by demineralization of dentin disks in 10% phosphoric acid solution...
September 7, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30201285/acrylamides-and-methacrylamides-as-alternative-monomers-for-dental-adhesives
#9
Stéfani Becker Rodrigues, Cesar Liberato Petzhold, Douglas Gamba, Vicente Castelo Branco Leitune, Fabrício Mezzomo Collares
OBJECTIVE: Synthesize and characterize a methacrylamide monomer for adhesive system and evaluate the physicochemical properties of the adhesive resin. METHODS: The liquid methacrylamide monomer N,N',N″-(nitrilotris(ethane-2,1-dyil)tris(2-methylacrylamide) (TMA) was prepared by reaction of methacrylic anhydride and tris(2-aminoethyl)amine with 60% yields. The TMA structure was analyzed by 1 H NMR, 13 C NMR, ATR-FTIR and UHPLC-QTOF-MS. Experimental adhesive resin containing bisphenol-A glycidyl methacrylate (BISGMA), 2-hydroxyethylacrylamide (HEAA), 2-hydroxyethylmethacrylate (HEMA) and TMA were formulated...
September 7, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30196988/functions-of-transcription-factors-nf-%C3%AE%C2%BAb-and-nrf2-in-the-inhibition-of-lps-stimulated-cytokine-release-by-the-resin-monomer-hema
#10
Helmut Schweikl, Marialucia Gallorini, Gerd Pöschl, Vera Urmann, Christine Petzel, Carola Bolay, Karl-Anton Hiller, Amelia Cataldi, Wolfgang Buchalla
OBJECTIVE: Resin monomers like 2-hydroxyethyl methacrylate (HEMA) interfere with effects induced by stressors such as lipopolysaccharide (LPS) released from cariogenic microorganisms. In this study, mechanisms underlying monomer-induced inhibition of the LPS-stimulated secretion of inflammatory cytokines from immunocompetent cells were investigated. METHODS: Secretion of pro-inflammatory cytokines TNF-α, IL-6 and the anti-inflammatory IL-10 from RAW264.7 mouse macrophages exposed to LPS and HEMA (0-6-8mM) was determined by ELISA...
September 6, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30172379/evaluating-dental-zirconia
#11
REVIEW
Yu Zhang, Brian R Lawn
OBJECTIVES: To survey simple contact testing protocols for evaluating the mechanical integrity of zirconia dental ceramics. Specifically, to map vital material property variations and to quantify competing damage modes. METHODS: Exploratory contact tests are conducted on layer structures representative of zirconia crowns on dentin. RESULTS: Sharp-tip micro- and nano-indentations were used to investigate the roles of weak interfaces and residual stresses in veneered zirconia, and to map property variations in graded structures...
August 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30139530/calcium-phosphates-as-ion-releasing-fillers-in-restorative-resin-based-materials
#12
REVIEW
Roberto Ruggiero Braga
Calcium phosphates (CaP) are the main constituents of the mineral phase in bones and teeth and, along with calcium silicates and bioactive glasses, have been extensively investigated in remineralization of enamel and dentin. When used as ion-releasing fillers in resin-based materials, they could contribute to extend the service life of adhesive restorations, remineralize caries-affected dentin or prevent caries lesions under sealants and orthodontic brackets. However, the development of resin-based bioactive materials is not straightforward because of the several compositional variables involved in ion release...
August 20, 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
#13
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...
August 1, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30072166/guest-editorial-the-red-rag-of-imprecision
#14
EDITORIAL
Brian W Darvell
No abstract text is available yet for this article.
July 30, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30072165/effect-of-sandblasting-etching-and-resin-bonding-on-the-flexural-strength-bonding-of-novel-glass-ceramics
#15
Chinwe O Uwalaka, Natalia Karpukhina, Xu Cao, Sami Bissasu, Rory M Wilson, Michael J Cattell
OBJECTIVES: To process novel leucite glass-ceramics and test the effects of surface treatment and resin bonding on the biaxial flexural strength (BFS) and shear bond strength (SBS). METHODS: Alumino-silicate glasses were ball-milled, and heat treated to form leucite glass-ceramics (LG-C, OLG-C), then sintered into ingots. Ingots were heat extruded into a refractory mould to form disc specimens (1.3×14mm diameter). IPS e.max® was used as a commercial comparison...
July 30, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30049596/fatigue-behavior-and-crack-initiation-of-cad-cam-resin-composite-molar-crowns
#16
Satoshi Yamaguchi, Renshirou Kani, Kazuma Kawakami, Manami Tsuji, Sayuri Inoue, Chunwoo Lee, Wakako Kiba, Satoshi Imazato
OBJECTIVE: The aim of this study was to evaluate long-term fatigue behavior using an in vitro step-stress accelerated life test (SSALT), and to determine the crack initiation point using in silico finite element analysis for computer-aided designed and manufactured (CAD/CAM) molar crowns fabricated from three commercial CAD/CAM resin composite blocks: Cerasmart (CS; GC, Tokyo, Japan), Katana Avencia Block (KA; Kuraray Noritake Dental, Niigata, Japan), and Shofu Block HC (HC; Shofu, Kyoto, Japan)...
July 23, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30037500/characterisation-of-machinable-structural-polymers-in-restorative-dentistry
#17
Abdulrahman Elmougy, Alvaro Muñoz Schiemann, Duncan Wood, Sarah Pollington, Nicolas Martin
OBJECTIVES: To characterise the mechanical properties of the machinable polymers Pekkton® (Cendres-Meteaux, Biel/Bienne, Switzerland), Lava Ultimate® (3MESPE, Seefeld, Germany), Vita Enamic® (Ivoclar Vivadent, Schaan, Liechtenstein) and the ceramic IPS e.Max Press® (Ivoclar Vivadent, Schaan, Liechtenstein). To determine the structural integrity of full coverage crowns fabricated from these materials. METHODS: The following tests were conducted: Biaxial flexural strength (BFS) using the piston on 3 balls jig (n=10); Vickers Hardness (VH) 10 indentations per sample with 10kg load & 20s dwell time (n=5); Hygroscopic Expansion Change (HEC) in artificial saliva over 68 days (n=5)...
July 20, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30029794/demineralization-capacity-of-commercial-10-methacryloyloxydecyl-dihydrogen-phosphate-based-all-in-one-adhesive
#18
Kou Fujita Nakajima, Toru Nikaido, Akishi Arita, Satoshi Hirayama, Norihiro Nishiyama
OBJECTIVE: We determined the amounts of calcium salt of 10-methacryloyloxydecyl dihydrogen phosphate (MDP-Ca salt) and dicalcium phosphate dihydride (DCPD) with an amorphous phase developed during the application of commercial MDP-based all-in-one adhesives to enamel and dentin. This is because the demineralization by MDP and following calcium salt formation of MDP may be limited by an ionic bond formation of MDP to hydroxyapaptite in the enamel and dentin and following intermediary layer formation of MDP, since MDP forms a chemically-stable adsorption layer...
July 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29970234/antimicrobial-photodynamic-active-biomaterials-for-periodontal-regeneration
#19
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
#20
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
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