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Dental Materials: Official Publication of the Academy of Dental Materials

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https://www.readbyqxmd.com/read/28528931/evaluation-of-alternative-monomers-to-hema-for-dental-applications
#1
Sven Tauscher, Jörg Angermann, Yohann Catel, Norbert Moszner
OBJECTIVE: The objective of this work is to find potential alternative monomers to 2-hydroxyethyl methacrylate (HEMA) for dental materials (self-etch adhesives and luting composites). METHODS: Monomers 1-9 were tested as potential HEMA substitutes. Methacrylates 4, 5 and 6 and (N-methyl)acrylamides 7-9 were synthesized and characterized by (1)H NMR spectroscopy. The reactivity of each monomer was studied using photo-DSC. Mixtures of monomers 1-9 with the urethane dimethacrylate UDMA (1/1: wt/wt) were formulated and cured...
May 18, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28527531/titanium-dioxide-nanotubes-addition-to-self-adhesive-resin-cement-effect-on-physical-and-biological-properties
#2
Carla M Ramos-Tonello, Paulo N Lisboa-Filho, Larisa B Arruda, Cintia K Tokuhara, Rodrigo C Oliveira, Adilson Y Furuse, José H Rubo, Ana Flávia S Borges
OBJECTIVES: This study has investigated the influence of Titanium dioxide nanotubes (TiO2-nt) addition to self-adhesive resin cement on the degree of conversion, water sorption, and water solubility, mechanical and biological properties. METHODS: A commercially available auto-adhesive resin cement (RelyX U200™, 3M ESPE) was reinforced with varying amounts of nanotubes (0.3, 0.6, 0.9wt%) and evaluated at different curing modes (self- and dual cure). The DC in different times (3, 6, 9, 12 and 15min), water sorption (Ws) and solubility (Sl), 3-point flexural strength (σf), elastic modulus (E), Knoop microhardness (H) and viability of NIH/3T3 fibroblasts were performed to characterize the resin cement...
May 17, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28526130/poly-amido-amine-and-calcium-phosphate-nanocomposite-remineralization-of-dentin-in-acidic-solution-without-calcium-phosphate-ions
#3
Kunneng Liang, Han Zhou, Michael D Weir, Chongyun Bao, Mark A Reynolds, Xuedong Zhou, Jiyao Li, Hockin H K Xu
OBJECTIVE: Patients with dry mouth often have an acidic oral environment lacking saliva that provides calcium (Ca) and phosphate (P) ions. However, there has been no study on dentin remineralization by placing samples in an acidic solution without Ca and P ions. Previous studies used saliva-like solutions with neutral pH and Ca and P ions. Therefore, the objective of this study was to investigate a novel method of combining poly(amido amine) (PAMAM) with a composite of nanoparticles of amorphous calcium phosphate (NACP) on dentin remineralization in an acidic solution without Ca and P ions for the first time...
May 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28522161/effect-of-blue-and-violet-light-on-polymerization-shrinkage-vectors-of-a-cq-tpo-containing-composite
#4
Camila S Sampaio, Pablo J Atria, Frederick A Rueggeberg, Satoshi Yamaguchi, Marcelo Giannini, Paulo G Coelho, Ronaldo Hirata, Regina M Puppin-Rontani
OBJECTIVE: To evaluate the effect of light-curing wavelengths on composite filler particle displacement, and thus to visualize localized polymerization shrinkage in a resin-based composite (RBC) containing camphorquinone (CQ) and Lucirin TPO (TPO). METHODS: Three light-curing units (LCUs) were used to light-cure a RBC containing CQ and TPO: a violet-only, a blue-only, and a dual-wavelength, conventional (Polywave(®), emitting violet and blue wavelengths simultaneously)...
May 15, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28506609/ageing-kinetics-and-strength-of-airborne-particle-abraded-3y-tzp-ceramics
#5
Jasna Cotič, Peter Jevnikar, Andraž Kocjan
OBJECTIVE: The combined effects of alumina airborne-particle abrasion and prolonged in vitro ageing on the flexural strength of 3Y-TZP ceramic have been studied. The aim was to identify the different effects on the surface and subsurface regions that govern the performance of this popular bioceramic known for its susceptibility to low-temperature degradation (LTD). METHODS: As-sintered or airborne-particle abraded 3Y-TZP discs were subjected to ageing at 134°C for up to 480h...
May 12, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28506608/plga-nanoparticles-as-chlorhexidine-delivery-carrier-to-resin-dentin-adhesive-interface
#6
Balasankar Meera Priyadarshini, Kakran Mitali, Thong Beng Lu, Harish K Handral, Nileshkumar Dubey, Amr S Fawzy
OBJECTIVE: To characterize and deliver fabricated CHX-loaded PLGA-nanoparticles inside micron-sized dentinal-tubules of demineralized dentin-substrates and resin-dentin interface. METHODS: Nanoparticles fabricated by emulsion evaporation were assessed in-vitro by different techniques. Delivery of drug-loaded nanoparticles to demineralized dentin substrates, interaction with collagen matrix, and ex-vivo CHX-release profiles using extracted teeth connected to experimental setup simulating pulpal hydrostatic pressure were investigated...
May 12, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28499493/bifunctional-dentifrice-amorphous-polyphosphate-a-regeneratively-active-sealant-with-potent-anti-streptococcus-mutans-activity
#7
Werner E G Müller, Meik Neufurth, Maximilian Ackermann, Emad Tolba, Michael Korzhev, Shunfeng Wang, Qingling Feng, Heinz C Schröder, Xiaohong Wang
OBJECTIVE: In this study we demonstrate that inorganic polyphosphate (polyP) exhibits a dual protective effect on teeth: it elicits a strong antibacterial effect against the cariogenic bacterium Streptococcus mutans and, in form of amorphous calcium polyP microparticles (size of 100-400nm), it efficiently reseals cracks/fissures in the tooth enamel and dentin. METHODS: Three different formulations of amorphous polyP microparticles (Ca-polyP, Zn-polyP and Sr-polyP) were prepared...
May 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28495017/graphene-for-the-development-of-the-next-generation-of-biocomposites-for-dental-and-medical-applications
#8
REVIEW
Han Xie, Tong Cao, Francisco Javier Rodríguez-Lozano, Emma Kim Luong-Van, Vinicius Rosa
OBJECTIVE: Graphene and its derivatives, graphene oxide (GO) and reduced graphene oxide (rGO), are 2D carbon-based materials with remarkable physical, chemical and biological properties. Graphene sheets have high specific surface area and mechanical strength. Moreover, they have been shown to influence the differentiation of stem cells and to improve properties of biomaterials. METHODS: Here, we present the recent achievements on the use of graphene and its derivatives to improve properties and enhance bioactivity of biomaterials...
May 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28487037/effect-of-self-curing-activators-and-curing-protocols-on-adhesive-properties-of-universal-adhesives-bonded-to-dual-cured-composites
#9
Mario Felipe Gutiérrez, Elisama Sutil, Pâmela Malaquias, Thalita de Paris Matos, Lucas Marques de Souza, Alessandra Reis, Jorge Perdigão, Alessandro D Loguercio
OBJECTIVES: To measure microshear bond strength (μSBS) and nanoleakage (NL) of self-etch universal adhesives under core buildup restorations using different curing protocols, at 24h and after 6-month water storage. METHODS: Middle dentin of 55 molars was divided into: Clearfil Universal Bond [CFU], Prime&Bond Elect [PBE], and One Coat 7 Universal [OCU]. All-Bond Universal [ABU] and Clearfil SE Bond [CSE] were used as control. CFU, PBE and OCU were: light-cured [LC], dual-cured [DC] and self-cured [SC]...
May 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28476202/periodontal-ligament-entheses-and-their-adaptive-role-in-the-context-of-dentoalveolar-joint-function
#10
REVIEW
Jeremy D Lin, Andrew T Jang, Michael P Kurylo, Jonathan Hurng, Feifei Yang, Lynn Yang, Arvin Pal, Ling Chen, Sunita P Ho
OBJECTIVE: The dynamic bone-periodontal ligament (PDL)-tooth fibrous joint consists of two adaptive functionally graded interfaces (FGI), the PDL-bone and PDL-cementum that respond to mechanical strain transmitted during mastication. In general, from a materials and mechanics perspective, FGI prevent catastrophic failure during prolonged cyclic loading. This review is a discourse of results gathered from literature to illustrate the dynamic adaptive nature of the fibrous joint in response to physiologic and pathologic simulated functions, and experimental tooth movement...
May 2, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28473225/measurement-uncertainty-associated-with-chromatic-confocal-profilometry-for-3d-surface-texture-characterization-of-natural-human-enamel
#11
F Mullan, D Bartlett, R S Austin
OBJECTIVE: To investigate the measurement performance of a chromatic confocal profilometer for quantification of surface texture of natural human enamel in vitro. METHODS: Contributions to the measurement uncertainty from all potential sources of measurement error using a chromatic confocal profilometer and surface metrology software were quantified using a series of surface metrology calibration artifacts and pre-worn enamel samples. The 3D surface texture analysis protocol was optimized across 0...
May 1, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28465067/unbound-monomers-do-diffuse-through-the-dentin-barrier
#12
Kods Mahdhaoui, Benjamin Fournier, Mathieu A Derbanne
OBJECTIVES: Assessing the role of dentinal fluid proteins in trans-dentinal diffusion of free monomers in vitro. METHODS: An artificial pulp chamber (APC) topped human dentin disks was used. A simplified two-step etch-and-rinse adhesive was formulated with 2-hydroethyl-methacrylate (HEMA), Bisphenol-A-diglycidyl-methacrylate (BisGMA), using Camphorquinone/tertiary amine as initiators. Two extraction media were used: buffered saline (Control), buffered saline with 1% bovine serum albumin (BSA)...
April 29, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28465066/bacterial-adhesion-not-inhibited-by-ion-releasing-bioactive-glass-filler
#13
Kumiko Yoshihara, Noriyuki Nagaoka, Yukinori Maruo, Hidehiko Sano, Yasuhiro Yoshida, Bart Van Meerbeek
OBJECTIVE: Bioactive glasses and surface pre-reacted glass-ionomer (sPRG) filler possess cariostatic properties owing to ion release. Many studies investigated potential cariostatic effects; few studies evaluated the surface stability and the structural changes their surfaces undergo in acidic conditions. METHODS: The surface resistance against acid attack and the surface receptiveness for bacterial adhesion and biofilm formation of a sPRG-filled (Beautifil ll, Shofu) and conventional glass-filled (Herculite XRV Ultra, Kerr) resin-based composite (RBC), and a conventional glass-ionomer cement (GIC; Fuji IX GP Extra, GC) were examined...
April 29, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28456351/synthesis-of-novel-chlorhexidine-spheres-with-controlled-release-from-a-udma-hema-resin-using-ultrasound
#14
Dong Luo, Saroash Shahid, Gleb B Sukhorukov, Michael J Cattell
OBJECTIVE: Establish the release kinetics of new chlorhexidine particles incorporated in a dental resin, and with the application of ultrasound. METHODS: Spherical chlorhexidine particles (SCP) were synthesized (5wt%), freeze dried and incorporated into UDMA-HEMA resins. Chlorhexidine diacetate (CDP) (5wt%) was similarly incorporated in separate resins. Resin discs were immersed in deionized water, and a release profile established (650h). Ultrasound was used to trigger chlorhexidine (CHX) release from the resin discs at specific durations (10-30s) and time intervals (1-425h)...
April 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28449922/antimicrobial-effect-and-physicochemical-properties-of-an-adhesive-system-containing-nanocapsules
#15
Bruna Genari, Vicente Castelo Branco Leitune, Denise Soledade Jornada, Melissa Camassola, Rodrigo Alex Arthur, Adriana Raffin Pohlmann, Silvia Stanisçuaski Guterres, Fabrício Mezzomo Collares, Susana Maria Werner Samuel
OBJECTIVE: To incorporate indomethacin and triclosan-loaded nanocapsules into primer and adhesive, and evaluate its properties. METHODS: Indomethacin and triclosan were encapsulated by deposition of preformed polymer and subsequently characterized regarding morphology, particle size, drug content and cytotoxicity. Nanocapsules (NCs) were incorporated into primer at 2% and into adhesive at 1, 2, 5, and 10% concentrations. Degree of conversion (DC) and softening in ethanol of the adhesive were evaluated...
April 24, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28442145/mechanical-characteristic-and-biological-behaviour-of-implanted-and-restorative-bioglasses-used-in-medicine-and-dentistry-a-systematic-review
#16
REVIEW
F Lizzi, C Villat, N Attik, P Jackson, B Grosgogeat, C Goutaudier
OBJECTIVE: Nowadays bioactive glasses are finding increasing applications in medical practice due to their ability to stimulate re-mineralisation. However, they are intrinsically brittle materials and the study of new compositions will open up new scenarios enhancing their mechanical properties and maintaining the high bioactivity for a broader range of applications. This systematic review aims to identify the relationship between the composition of bioactive glasses used in medical applications and their influence on the mechanical and biological properties...
April 22, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28434560/accelerated-fatigue-testing-of-dentin-composite-bond-with-continuously-increasing-load
#17
Kai Li, Jiawen Guo, Yuping Li, Young Cheul Heo, Jihua Chen, Haitao Xin, Alex Fok
OBJECTIVES: The aim of this study was to evaluate an accelerated fatigue test method that used a continuously increasing load for testing the dentin-composite bond strength. METHODS: Dentin-composite disks (ϕ5mm×2mm) made from bovine incisor roots were subjected to cyclic diametral compression with a continuously increasingly load amplitude. Two different load profiles, linear and nonlinear with respect to the number of cycles, were considered. The data were then analyzed by using a probabilistic failure model based on the Weakest-Link Theory and the classical stress-life function, before being transformed to simulate clinical data of direct restorations...
April 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28431686/adm-guidance-ceramics-all-ceramic-multilayer-interfaces-in-dentistry
#18
Ulrich Lohbauer, Susanne S Scherrer, Alvaro Della Bona, Michael Tholey, Richard van Noort, Alessandro Vichi, J Robert Kelly, Paulo F Cesar
This guidance document describes the specific issues involved in dental multilayer ceramic systems. The material interactions with regard to specific thermal and mechanical properties are reviewed and the characteristics of dental tooth-shaped processing parameters (sintering, geometry, thickness ratio, etc.) are discussed. Several techniques for the measurement of bond quality and residual stresses are presented with a detailed discussion of advantages and disadvantages. In essence no single technique is able to describe adequately the all-ceramic interface...
April 18, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28416222/dentin-on-the-nanoscale-hierarchical-organization-mechanical-behavior-and-bioinspired-engineering
#19
REVIEW
Luiz E Bertassoni
OBJECTIVE: Knowledge of the structural organization and mechanical properties of dentin has expanded considerably during the past two decades, especially on a nanometer scale. In this paper, we review the recent literature on the nanostructural and nanomechanical properties of dentin, with special emphasis in its hierarchical organization. METHODS: We give particular attention to the recent literature concerning the structural and mechanical influence of collagen intrafibrillar and extrafibrillar mineral in healthy and remineralized tissues...
April 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28413061/mechanical-behavior-of-bulk-direct-composite-versus-block-composite-and-lithium-disilicate-indirect-class-ii-restorations-by-cad-fem-modeling
#20
Pietro Ausiello, Stefano Ciaramella, Andrea Fabianelli, Antonio Gloria, Massimo Martorelli, Antonio Lanzotti, David C Watts
OBJECTIVES: To study the influence of resin based and lithium disilicate materials on the stress and strain distributions in adhesive class II mesio-occlusal-distal (MOD) restorations using numerical finite element analysis (FEA). To investigate the materials combinations in the restored teeth during mastication and their ability to relieve stresses. METHODS: One 3D model of a sound lower molar and three 3D class II MOD cavity models with 95° cavity-margin-angle shapes were modelled...
April 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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