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Dental Materials: Official Publication of the Academy of Dental Materials

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https://www.readbyqxmd.com/read/29325861/crystallographic-and-morphological-analysis-of-sandblasted-highly-translucent-dental-zirconia
#1
Masanao Inokoshi, Haruki Shimizu, Kosuke Nozaki, Tomohiro Takagaki, Kumiko Yoshihara, Noriyuki Nagaoka, Fei Zhang, Jozef Vleugels, Bart Van Meerbeek, Shunsuke Minakuchi
OBJECTIVE: To assess the influence of alumina sandblasting on four highly translucent dental zirconia grades. METHODS: Fully sintered zirconia disk-shaped specimens (15-mm diameter; 0.5-mm thickness) of four highly translucent yttria partially stabilized zirconia (Y-PSZ) grades (KATANA HT, KATANA STML, KATANA UTML, Kuraray Noritake; Zpex Smile, Tosoh) were sandblasted with 50-μm alumina (Al2O3) sand (Kulzer) or left 'as-sintered' (control) (n=5). For each zirconia grade, the translucency was measured using a colorimeter...
January 8, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29317097/precision-of-655nm-confocal-laser-profilometry-for-3d-surface-texture-characterisation-of-natural-human-enamel-undergoing-dietary-acid-mediated-erosive-wear
#2
F Mullan, P Mylonas, C Parkinson, D Bartlett, R S Austin
OBJECTIVES: To assess the precision of optical profilometry for characterising the 3D surface roughness of natural and polished human enamel in order to reliably quantify acid mediated surface roughness changes in human enamel. METHODS: Forty-two enamel samples were prepared from extracted human molars and either polished flat or left unmodified. To investigate precision, the variability of thirty repeated measurements of five areas of one polished and one natural enamel sample was assessed using 655nm Confocal Laser Profilometry...
January 6, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29310906/development-of-layered-plga-membranes-for-periodontal-tissue-regeneration
#3
Itsumi Yoshimoto, Jun-Ichi Sasaki, Ririko Tsuboi, Satoshi Yamaguchi, Haruaki Kitagawa, Satoshi Imazato
OBJECTIVE: Various commercial products are available for guided tissue regeneration (GTR) therapy; however, they do not combine biosafety with the ability to control cell function. The purpose of this study was to evaluate the physicochemical and biological characteristics of the novel bilayer biodegradable poly(lactic-co-glycolic acid) (PLGA) membrane, and to assess whether the bilayer PLGA membrane could be used for periodontal tissue regeneration. METHODS: Bilayer biodegradable membrane was fabricated thorough a two-step freezing and lyophilization process using PLGA solution...
January 5, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29306486/modulation-of-gingival-cell-response-towards-dental-composites
#4
A Jerg, S D Schulz, P Tomakidi, E Hellwig, O Polydorou
OBJECTIVE: This aim of this study was to investigate the cell behavioural response on clinically applied dental composites in exposition-relevant target cells, i.e. human gingival fibroblasts (HGF) and epithelial keratinocytes (HGK). METHODS: HGF and HGK were exposed to eluates of Ceram X™, Filtek™ Silorane, Filtek™ Supreme XTE, Fusio™ Liquid Dentin and Vertise™ Flow. Eluates were created by storing material samples in respective cell culture medium, for 24h and 72h (n=17), according to ISO 10993-12:2012...
January 3, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29301652/influence-of-a-surface-conditioner-to-pre-sintered-zirconia-on-the-biaxial-flexural-strength-and-phase-transformation
#5
Tomofumi Sawada, Christine Schille, Judit Zöldföldi, Ernst Schweizer, Jürgen Geis-Gerstorfer, Sebastian Spintzyk
OBJECTIVES: To assess the influence of a surface conditioner applied to pre-sintered yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) on the biaxial flexural strength and phase transformation. METHODS: Conditioner-coated specimens (12mm diameter×0.8mm thickness) were prepared by application of a slurry conditioner using a brush on pre-sintered Y-TZP discs, followed by sandblasting with 50-μm Al2O3 after sintering (C-SB) or no further treatment (C-NT)...
January 1, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29301651/release-of-ictp-and-ctx-telopeptides-from-demineralized-dentin-matrices-effect-of-time-mass-and-surface-area
#6
Gianluca Turco, Milena Cadenaro, Tatjana Maravić, Andrea Frassetto, Eleonora Marsich, Annalisa Mazzoni, Roberto Di Lenarda, Franklin R Tay, David H Pashley, Lorenzo Breschi
OBJECTIVE: The present study evaluated the influence of time, mass and surface area of demineralized dentin collagen matrices on telopeptides release. The hypotheses tested were that the rates of ICTP and CTX release by matrix bound endogenous proteases are 1) not time-dependent, 2) unrelated to specimen mass, 3) unrelated to specimen surface area. METHODS: Non-carious human molars (N=24) were collected and randomly assigned to three groups. Dentin slabs with three different thicknesses: 0...
January 1, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29287980/development-of-radiopaque-biocompatible-antimicrobial-micro-particle-fillers-for-micro-ct-imaging-of-simulated-periodontal-pockets
#7
M Elashiry, M M Meghil, S Kalathingal, A Buchanan, M Rajendran, R Elrefai, M Ochieng, A Elawady, R M Arce, K H Sandhage, C W Cutler
OBJECTIVES: Approximately 109 bacteria can be harbored within periodontal pockets (PP) along with inflammatory byproducts implicated in the pathophysiology of systemic diseases linked to periodontitis (PD). Calculation of this inflammatory burden has involved estimation of total pocket surface area using analog data from conventional periodontal probing which is unable to determine the three-dimensional (3-D) nature of PP. The goals of this study are to determine the radiopacity, biocompatibility, and antimicrobial activity of transient micro-particle fillers in vitro and demonstrate their capability for 3-D imaging of artificial PP (U...
December 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29287979/an-evaluation-of-the-biocompatibility-and-osseointegration-of-novel-glass-fiber-reinforced-composite-implants-in-vitro-and-in-vivo-studies
#8
Ya-Hui Chan, Wei-Zhen Lew, Emily Lu, Thomas Loretz, Luke Lu, Che-Tong Lin, Sheng-Wei Feng
OBJECTIVES: The aim of this study was to evaluate the in vitro biocompatibility and in vivo osseointegration of three novel bioactive glass fiber reinforced composite (GFRC) implants and to compare these with metal (Ti6Al4V) implants. METHODS: The surfaces of these experimental substrates were characterized by scanning electron microscopy (SEM), a 2D profilometer and by contact angle measurement. In vitro biological performance was assessed using MG-63 human osteoblast-like cell morphology, cell proliferation assays and the alkaline phosphatase (ALP) activity testing...
December 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29269159/the-anti-caries-effects-of-dental-adhesive-resin-influenced-by-the-position-of-functional-groups-in-quaternary-ammonium-monomers
#9
Jingou Liang, Mingyun Li, Biao Ren, Tianmu Wu, Hockin H K Xu, Yong Liu, Xian Peng, Ge Yang, Michael D Weir, Shiyong Zhang, Lei Cheng, Xuedong Zhou
OBJECTIVES: A new quaternary ammonium monomer (QAM), triethylaminododecyl acrylate (TEADDA) was synthesized, in which the position of the functional groups was different from that of dimethylaminododecyl methacrylate (DMADDM). The objectives were to: (1) investigate the effect of the changed position of the functional groups on the mechanical properties, anti-biofilm activity and biocompatibility of adhesive resin, and (2) study the anti-bacterial mechanism of QAM to improve the performance of the adhesive system modified by QAM...
December 18, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29258696/residual-stress-of-porcelain-fused-to-zirconia-3-unit-fixed-dental-prostheses-measured-by-nanoindentation
#10
Vinicius P Fardin, Estevam A Bonfante, Paulo G Coelho, Malvin N Janal, Nick Tovar, Lukasz Witek, Dimorvan Bordin, Gerson Bonfante
OBJECTIVE: To evaluate the residual stress (nanoindentation based on hardness) of fatigued porcelain-fused to zirconia 3-unit fixed dental prostheses (FDP) with different framework designs. METHODS: Twenty maxillary 3-unit FDP replacing second-premolar (pontic) were fabricated with conventional framework-design (even-thickness of 0.5mm and 9mm2 connector area) and modified framework-design (thickness of 0.5mm presenting lingual collar connected to proximal struts and 12mm2 connector area)...
December 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29233540/smear-layer-deproteinizing-improves-bonding-of-one-step-self-etch-adhesives-to-dentin
#11
Ornnicha Thanatvarakorn, Taweesak Prasansuttiporn, Suppason Thittaweerat, Richard M Foxton, Shizuko Ichinose, Junji Tagami, Keiichi Hosaka, Masatoshi Nakajima
OBJECTIVES: Smear layer deproteinizing was proved to reduce the organic phase of smear layer covered on dentin surface. It was shown to eliminate hybridized smear layer and nanoleakage expression in resin-dentin bonding interface of two-step self-etch adhesive. This study aimed to investigate those effects on various one-step self-etch adhesives. METHODS: Four different one-step self-etch adhesives were used in this study; SE One (SE), Scotchbond™ Universal (SU), BeautiBond Multi (BB), and Bond Force (BF)...
December 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29233539/effect-of-tetracalcium-phosphate-monetite-toothpaste-on-dentin-remineralization-and-tubule-occlusion-in-vitro
#12
L Medvecky, R Stulajterova, M Giretova, J Mincik, M Vojtko, J Balko, J Briancin
OBJECTIVES: To investigate the tubule occlusion and remineralization potential of a novel toothpaste with active tetracalcium phosphate/monetite mixtures under de/remineralization cycling. METHODS: Dentin de/remineralization cycling protocol consisted of demineralization in 1% citric acid at pH 4.6 with following remineralization with toothpastes and soaking in artificial saliva. Effectiveness of toothpastes to promote remineralization was evaluated by measurement of microhardness recovery, analysis of surface roughness, thickness of coating and scanning electron microscopy...
December 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29217312/long-term-stability-of-dental-adhesive-incorporated-by-boron-nitride-nanotubes
#13
Felipe Weidenbach Degrazia, Vicente Castelo Branco Leitune, Fernanda Visioli, Susana Maria Werner Samuel, Fabrício Mezzomo Collares
OBJECTIVE: The aim of this study was to evaluate physicochemical properties, long-term microtensile bond strength and cytotoxicity of methacrylate-based adhesive containing boron nitride nanotubes (BNNTs) as fillers. METHODS: A dental adhesive was formulated using BisGMA/HEMA, 66/33wt% (control). Inorganic BNNT fillers were incorporated into the adhesive at different concentrations (0.05, 0.075, 0.1 and 0.15wt%). Analyses of degree of conversion (DC), polymerization rate [Rp...
December 4, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29208311/bonding-strategies-for-mih-affected-enamel-and-dentin
#14
Norbert Krämer, Ngoc-Han Nana Bui Khac, Susanne Lücker, Vitus Stachniss, Roland Frankenberger
OBJECTIVES: Aim of the present study was to evaluate resin composite adhesion to dental hard tissues affected by molar incisor hypomineralisation (MIH). METHODS: 94 freshly extracted human molars and incisors (53 suffering MIH) were used. 68 teeth (35 with MIH) were used for μ-TBS tests in enamel and dentin, 26 (18 with MIH) for qualitative evaluation. Specimens were bonded with Clearfil SE Bond, Scotchbond Universal, and OptiBond FL. For MIH affected enamel, additional OptiBond FL groups with NaOCl and NaOCl+Icon were investigated...
December 2, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29203072/practical-and-theoretical-considerations-on-the-fracture-toughness-testing-of-dental-restorative-materials
#15
REVIEW
Renan Belli, Michael Wendler, José I Zorzin, Ulrich Lohbauer
BACKGROUND: An important tool in materials research, development and characterization regarding mechanical performance is the testing of fracture toughness. A high level of accuracy in executing this sort of test is necessary, with strict requirements given in extensive testing standard documents. Proficiency in quality specimen fabrication and test requires practice and a solid theoretical background, oftentimes overlooked in the dental community. AIMS: In this review we go through some fundamentals of the fracture mechanics concepts that are relevant to the understanding of fracture toughness testing, and draw attention to critical aspects of practical nature that must be fulfilled for validity and accuracy in results...
December 1, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29199009/characterization-mechanistic-analysis-and-improving-the-properties-of-denture-adhesives
#16
Afsoon Fallahi, Nona Khadivi, Nima Roohpour, Andrew M Middleton, Mehdi Kazemzadeh-Narbat, Nasim Annabi, Ali Khademhosseini, Ali Tamayol
OBJECTIVE: Denture adhesives are widely used to avoid the detachment and sliding of dentures. However, the adhesion properties can be affected by variation in mouth conditions such as the level of salivation. The objective of this study was to understand the effect of environmental conditions on the adhesion properties of a commercially available denture adhesive named as Poligrip® Free manufactured by GlaxoSmithKline Ltd., UK and to identify the reasons for the observed variation in its adhesion strength...
November 30, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29199008/photopolymerization-of-cell-laden-gelatin-methacryloyl-hydrogels-using-a-dental-curing-light-for-regenerative-dentistry
#17
Nelson Monteiro, Greeshma Thrivikraman, Avathamsa Athirasala, Anthony Tahayeri, Cristiane M França, Jack L Ferracane, Luiz E Bertassoni
Photopolymerized hydrogels, such as gelatin methacryloyl (GelMA), have desirable biological and mechanical characteristics for a range of tissue engineering applications. OBJECTIVE: This study aimed to optimize a new method to photopolymerize GelMA using a dental curing light (DL). METHODS: Lithium acylphosphinate photo-initiator (LAP, 0.05, 0.067, 0.1% w/v) was evaluated for its ability to polymerize GelMA hydrogel precursors (10% w/v) encapsulated with odontoblast-like cells (OD21)...
November 30, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29199007/can-pulpal-floor-debonding-be-detected-from-occlusal-surface-displacement-in-composite-restorations
#18
João Batista Novaes, Elissa Talma, Estevam Barbosa Las Casas, Wondwosen Aregawi, Lauren Wickham Kolstad, Sue Mantell, Yan Wang, Alex Fok
OBJECTIVES: Polymerization shrinkage of resin composite restorations can cause debonding at the tooth-restoration interface. Theory based on the mechanics of materials predicts that debonding at the pulpal floor would half the shrinkage displacement at the occlusal surface. The aim of this study is to test this theory and to examine the possibility of detecting subsurface resin composite restoration debonding by measuring the superficial shrinkage displacements. METHODS: A commercial dental resin composite with linear shrinkage strain of 0...
November 30, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29183674/effects-of-different-sterilization-methods-on-surface-characteristics-and-biofilm-formation-on-zirconia-in-vitro
#19
Aifang Han, James K H Tsoi, Jukka P Matinlinna, Yu Zhang, Zhuofan Chen
OBJECTIVE: The current laboratory study was to investigate the effect of different sterilization treatments on surface characteristics of zirconia, and biofilm formation on zirconia surface after exposure to these sterilization treatments. METHODS: Commercially available zirconia discs (Cerconbase, Degu-Dent, Hanau, Germany) were prepared and polished to the same value of surface roughness. The discs were treated with one of the following sterilization methods steam autoclave sterilization, dry heat sterilization, ultraviolet C (UVC) irradiation, and gamma (γ) ray irradiation...
November 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29183673/effect-of-tribochemical-treatments-and-silane-reactivity-on-resin-bonding-to-zirconia
#20
Raphael Pilo, Maria Dimitriadi, Anna Palaghia, George Eliades
OBJECTIVE: The aim of the study was to assess the roughness, structure and bond strength with zirconia of four grit-blasting treatments combined with three silane types, the reactivity of which was evaluated, as well. METHODS: The grit-blasted treatments performed on zirconia (Lava) were alumina (ALU), CoJet (COJ), SilJet (SLJ) and SilJet Plus (SJP, with silica-encapsulated silane). The other two silanes selected were the S-Bond (SB, prehydrolyzed) and Clearfil Ceramic Primer Plus (CP, prehydrolyzed with 10-MDP)...
November 25, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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