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Dental Materials: Official Publication of the Academy of Dental Materials

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https://www.readbyqxmd.com/read/28818339/impact-of-machining-on-the-flexural-fatigue-strength-of-glass-and-polycrystalline-cad-cam-ceramics
#1
Sara Fraga, Marina Amaral, Marco Antônio Bottino, Luiz Felipe Valandro, Cornelis Johannes Kleverlaan, Liliana Gressler May
OBJECTIVES: To assess the effect of machining on the flexural fatigue strength and on the surface roughness of different computer-aided design, computer-aided manufacturing (CAD/CAM) ceramics by comparing machined and polished after machining specimens. METHODS: Disc-shaped specimens of yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP), leucite-, and lithium disilicate-based glass ceramics were prepared by CAD/CAM machining, and divided into two groups: machining (M) and machining followed by polishing (MP)...
August 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28807329/impact-of-thio-urethane-additive-and-filler-type-on-light-transmission-and-depth-of-polymerization-of-dental-composites
#2
André Luis Faria-E-Silva, Carmem Silvia Pfeifer
OBJECTIVE: This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. METHODS: BisGMA:UDMA:TEGMA (5:3:2wt%) were mixed with 0 (control) or 20wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization...
August 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28801178/impact-of-head-and-neck-radiotherapy-on-the-mechanical-behavior-of-composite-resins-and-adhesive-systems-a-systematic-review
#3
REVIEW
Cristhian Camilo Madrid Troconis, Alan Roger Santos-Silva, Thaís Bianca Brandão, Marcio Ajudarte Lopes, Mario Fernando de Goes
OBJECTIVES: To analyze the evidence regarding the impact of head and neck radiotherapy (HNRT) on the mechanical behavior of composite resins and adhesive systems. METHODS: Searches were conducted on PubMed, Embase, Scopus and ISI Web of Science databases using "Radiotherapy", "Composite resins" and "Adhesive systems" as keywords. Selected studies were written in English and assessed the mechanical behavior of composite resins and/or adhesive systems when bonding procedure was conducted before and/or after a maximum radiation dose ≥50Gy, applied under in vitro or in vivo conditions...
August 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28797747/metal-composite-adhesion-based-on-diazonium-chemistry
#4
Yara Oweis, Omar Alageel, Paige Kozak, Mohamed-Nur Abdallah, Jean-Marc Retrouvey, Marta Cerruti, Faleh Tamimi
OBJECTIVE: Composite resins do not adhere well to dental alloys. This weak bond can result in failure at the composite-metal interface in fixed dental prostheses and orthodontic brackets. The aim of this study was to develop a new adhesive, based on diazonium chemistry, to facilitate chemical bonding between dental alloys and composite resin. METHODS: Samples of two types of dental alloys, stainless steel and cobalt chromium were primed with a diazonium layer in order to create a surface coating favorable for composite adhesion...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28797746/synthesis-of-wrinkled-mesoporous-silica-and-its-reinforcing-effect-for-dental-resin-composites
#5
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVE: The aim of this work is to explore the reinforcing effect of wrinkled mesoporous silica (WMS), which should allow micromechanical resin matrix/filler interlocking in dental resin composites, and to investigate the effect of silica morphology, loading, and compositions on their mechanical properties. METHODS: WMS (average diameter of 496nm) was prepared through the self-assembly method and characterized by the use of the electron microscopy, dynamic light scattering, and the N2 adsorption-desorption measurements...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28789858/aging-of-3y-tzp-dental-zirconia-and-yttrium-depletion
#6
P Pandoleon, E Kontonasaki, N Kantiranis, N Pliatsikas, P Patsalas, L Papadopoulou, T Zorba, K M Paraskevopoulos, P Koidis
OBJECTIVE: Yttrium-stabilized zirconia is susceptible to low temperature degradation after interaction with water. Various mechanisms by which water molecules destabilize the tetragonal phase have been proposed, while the concept of yttrium depletion by the incorporation of hydroxyl ions in the crystalline structure either through the formation of YOH/ZrOH bonds or small α-Y(OH)3 crystallites, is prevailing. The present study was performed to investigate the surface alterations on a 3Y-TZP dental ceramic during the process of in-vitro aging and to further explore the yttrium depletion mechanism that occurs upon interaction with water...
August 5, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28781068/resin-dentin-bond-stability-and-physical-characterization-of-a-two-step-self-etching-adhesive-system-associated-with-tif4
#7
Gabriele Barbosa Torres, Tânia Mara da Silva, Rosanna Tarkany Basting, Enrico Coser Bridi, Fabiana Mantovani Gomes França, Cecilia Pedroso Turssi, Flávia Lucisano Botelho do Amaral, Sérgio Eduardo de Paiva Gonçalves, Roberta Tarkany Basting
OBJECTIVES: To evaluate the bond strength to superficial (SD) and deep (DD) dentin after the use of 2.5% (T2.5%) or 4% (T4%) titanium tetrafluoride (TiF4) in aqueous solution as a dentin pretreatment, or when incorporated into the primer (T2.5%P and T4%P) of an adhesive system (Clearfil SE Bond/CL). Degree of conversion (DC), particle size (PS), polydispersity index (PI) and zeta potential (ZP) of the solutions were evaluated. METHODS: Fifty molars were sectioned longitudinally to obtain two slices of each tooth, which were demarcated into SD and DD...
August 3, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28779891/silver-nanoparticles-in-dentistry
#8
REVIEW
Victor T Noronha, Amauri J Paula, Gabriela Durán, Andre Galembeck, Karina Cogo-Müller, Michelle Franz-Montan, Nelson Durán
OBJECTIVE: Silver nanoparticles (AgNPs) have been extensively studied for their antimicrobial properties, which provide an extensive applicability in dentistry. Because of this increasing interest in AgNPs, the objective of this paper was to review their use in nanocomposites; implant coatings; pre-formulation with antimicrobial activity against cariogenic pathogens, periodontal biofilm, fungal pathogens and endodontic bacteria; and other applications such as treatment of oral cancer and local anesthesia...
August 2, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28779890/effect-of-conditioning-solutions-containing-ferric-chloride-on-dentin-bond-strength-and-collagen-degradation
#9
Raquel Viana Rodrigues, Marcelo Giannini, Fernanda Miori Pascon, Preety Panwar, Dieter Brömme, Adriana Pigozzo Manso, Ricardo Marins Carvalho
OBJECTIVE: To investigate the effects of conditioning solutions containing ferric chloride (FeCl3) on resin-dentin bond strength; on protection of dentin collagen against enzymatic degradation and on cathepsin-K (CT-K) activity. METHODS: Conditioning solutions were prepared combining citric acid (CA) and anhydrous ferric chloride (FeCl3) in different concentrations. The solutions were applied to etch flat dentin surfaces followed by bonding with adhesive resin. Phosphoric acid (PA) gel etchant was used as control...
August 2, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28778495/development-of-binary-and-ternary-titanium-alloys-for-dental-implants
#10
Jairo M Cordeiro, Thamara Beline, Ana Lúcia R Ribeiro, Elidiane C Rangel, Nilson C da Cruz, Richard Landers, Leonardo P Faverani, Luís Geraldo Vaz, Laiza M G Fais, Fabio B Vicente, Carlos R Grandini, Mathew T Mathew, Cortino Sukotjo, Valentim A R Barão
OBJECTIVE: The aim of this study was to develop binary and ternary titanium (Ti) alloys containing zirconium (Zr) and niobium (Nb) and to characterize them in terms of microstructural, mechanical, chemical, electrochemical, and biological properties. METHODS: The experimental alloys - (in wt%) Ti-5Zr, Ti-10Zr, Ti-35Nb-5Zr, and Ti-35Nb-10Zr - were fabricated from pure metals. Commercially pure titanium (cpTi) and Ti-6Al-4V were used as controls. Microstructural analysis was performed by means of X-ray diffraction and scanning electron microscopy...
August 1, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28778494/rechargeable-microbial-anti-adhesive-polymethyl-methacrylate-incorporating-silver-sulfadiazine-loaded-mesoporous-silica-nanocarriers
#11
Jeong-Ki Jo, Ahmed El-Fiqi, Jung-Hwan Lee, Dong-Ae Kim, Hae-Won Kim, Hae-Hyoung Lee
OBJECTIVES: Even though polymethyl methacrylate (PMMA) resin is widely used as a dental material, it has poor microbial anti-adhesive properties, which accelerates oral infections. In this investigation, silver-sulfadiazine (AgSD)-loaded mesoporous silica nanoparticles (Ag-MSNs) were incorporated into PMMA to introduce long-term microbial anti-adhesive effects and to make PMMA a rechargeable resin. METHODS: After characterization of the Ag-MSNs in terms of their mesoporous characteristics and drug loading capacity, the 3 point flexural test and hardness were evaluated in PMMA incorporating Ag-MSNs (0...
August 1, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28774431/rapid-biomimetic-remineralization-of-the-demineralized-enamel-surface-using-nano-particles-of-amorphous-calcium-phosphate-guided-by-chimaeric-peptides
#12
Zuohui Xiao, Kehua Que, Haorong Wang, Ran An, Zhen Chen, Zhongjun Qiu, Mingli Lin, Jinhua Song, Jie Yang, Danyang Lu, Minjuan Shen, Binbin Guan, Yinghui Wang, Xuliang Deng, Xiaoping Yang, Qing Cai, Jiaying Deng, Li Ma, Xi Zhang, Xu Zhang
OBJECTIVE: The objective of this study was to develop a rapid and effective method to remineralize human carious-like enamel using chimaeric peptide-mediated nanocomplexes of carboxymethyl chitosan/amorphous calcium phosphate (CMC/ACP), mimicking the mineralizing pattern of the oriented assembly of ACP guided by amelogenin in the biomineralization of enamel. METHODS: CMC/ACP nanocomplex solution was first synthesized through the successive addition of carboxymethyl chitosan, calcium chloride, and dipotassium phosphate into distilled water...
July 31, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28774430/modulation-of-streptococcus-mutans-virulence-by-dental-adhesives-containing-anti-caries-agents
#13
Carolina Bosso André, Pedro Luiz Rosalen, L C C Galvão, Bruna Marin Fronza, Glaucia Maria Bovi Ambrosano, Jack Liborio Ferracane, Marcelo Giannini
OBJECTIVES: The aim of this in vitro study was to analyze the effect of the incorporation of two anti-caries agents into dental adhesives on the reduction of the virulence of Streptococcus mutans and on the adhesion to dentin. METHODS: Apigenin (1mM) and tt-Farnesol (5mM) were added separately and in combination to a self-etch adhesive (CS3 - Clearfil S3 Bond Plus) and to an each-and-rinse adhesive (OPT - OptiBond S). Biofilm of S. mutans was grown on adhesive-coated hydroxyapatite disks for 115h and bacterial viability, dry-weight, alkali soluble, water soluble, intracellular polysaccharides and protein were quantified...
July 31, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28760330/thermographic-analysis-of-the-effect-of-composite-type-layering-method-and-curing-light-on-the-temperature-rise-of-photo-cured-composites-in-tooth-cavities
#14
Min-Jung Kim, Ryan Jin-Young Kim, Jack Ferracane, In-Bog Lee
OBJECTIVES: The purpose of this study was to investigate temperature rise in the composite and dentin of a class I cavity in extracted human molars under different restoration conditions, including the use of different composite types, layering methods, and curing lights. METHODS: Open occlusal cavities were prepared on 28 extracted human molars. A conventional (Filtek Z250) and a bulk-fill (Filtek Bulk Fill Posterior; BFP) composite were used to restore the preparations...
July 28, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28755761/do-quaternary-ammonium-monomers-induce-drug-resistance-in-cariogenic-endodontic-and-periodontal-bacterial-species
#15
Suping Wang, Haohao Wang, Biao Ren, Hao Li, Michael D Weir, Xuedong Zhou, Thomas W Oates, Lei Cheng, Hockin H K Xu
OBJECTIVES: Antibacterial monomers were developed to combat oral biofilm acids and caries; however, little is known on whether quaternary ammonium monomers (QAMs) would induce drug resistance in oral bacteria. The objective of this study was to investigate the effects of new antimicrobial monomers dimethylaminohexadecyl methacrylate (DMAHDM) and dimethylaminododecyl methacrylate (DMADDM) on the induction of drug resistance in eight species of cariogenic, endodontic and periodontal bacteria for the first time...
July 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28754254/anti-proteolytic-property-and-bonding-durability-of-mussel-adhesive-protein-modified-dentin-adhesive-interface
#16
Hui Fang, Quan-Li Li, Min Han, May Lei Mei, Chun Hung Chu
OBJECTIVES: To evaluate the effect of mussel adhesive protein (MAP) on collagenase activity, dentin collagen degradation and microtensile dentin bond strength (μTBS). METHODS: Three groups were designed: 1. experimental group: treated with MAP; 2. positive control: treated with GM6001 (collagenase-inhibitor); 3. negative control: treated with distilled water (DW). For collagenase activity, Clostridiopeptidase-A was added to each group (n=5), and collagenase activity was assessed by colorimetric assay...
July 25, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28751073/efficacy-of-new-natural-biomodification-agents-from-anacardiaceae-extracts-on-dentin-collagen-cross-linking
#17
M A Moreira, N O Souza, R S Sousa, D Q Freitas, M V Lemos, D M De Paula, F J N Maia, D Lomonaco, S E Mazzetto, V P Feitosa
OBJECTIVES: Several polyphenols from renewable sources were surveyed for dentin biomodification. However, phenols from cashew nut shell liquid (CNSL, Anacardium occidentale) and from Aroeira (Myracrodruon urundeuva) extract have never been evaluated. The present investigation aimed to compare the dentin collagen crosslinking (biomodification) effectiveness of polyphenols from Aroeira stem bark extract, proanthocyanidins (PACs) from grape-seed extract (Vitis vinifera), cardol and cardanol from CNSL after clinically relevant treatment for one minute...
July 24, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28751072/the-interrelationship-of-microstructure-and-hardness-of-human-coronal-dentin-using-reference-point-indentation-technique-and-micro-raman-spectroscopy
#18
Rasoul Seyedmahmoud, Jacob D McGuire, Yong Wang, Ganesh Thiagarajan, Mary P Walker
OBJECTIVES: The aim of this paper is to determine the interrelationship between the microstructure - in terms of chemical composition and crystallinity - to the microhardness of coronal dentin. METHODS: Dentin microhardness was tested by a novel reference point indenter and compared to the traditional Knoop hardness method. Micro-Raman spectroscopy was used to determine the chemical composition and crystallinity of dentin. RESULTS: From the occlusal groove to the border of the coronal pulp chamber, dentin hardness decreased from superficial dentin (SD) to deep dentin (DD)...
July 24, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28734568/antibacterial-properties-of-nano-silver-coated-peek-prepared-through-magnetron-sputtering
#19
Xiuju Liu, Kang Gan, Hong Liu, Xiaoqing Song, Tianjie Chen, Chenchen Liu
OBJECTVE: We aimed to investigate the cytotoxicity and antibacterial properties of nano-silver-coated polyetheretherketone (PEEK) produced through magnetron sputtering and provide a theoretical basis for its use in clinical applications. METHODS: The surfaces of PEEKs were coated with nano-silver at varying thicknesses (3, 6, 9, and 12nm) through magnetron sputtering technology. The resulting coated PEEK samples were classified into the following groups according to the thickness of the nano-silver coating: PEEK-3 (3nm), PEEK-6 (6nm), PEEK-9 (9nm), PEEK-12 (12nm), and PEEK control group...
July 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28734567/effect-of-calcium-phosphate-nanocomposite-on-in-vitro-remineralization-of-human-dentin-lesions
#20
Michael D Weir, Jianping Ruan, Ning Zhang, Laurence C Chow, Ke Zhang, Xiaofeng Chang, Yuxing Bai, Hockin H K Xu
OBJECTIVE: Secondary caries is a primary reason for dental restoration failures. The objective of this study was to investigate the remineralization of human dentin lesions in vitro via restorations using nanocomposites containing nanoparticles of amorphous calcium phosphate (NACP) or NACP and tetracalcium phosphate (TTCP) for the first time. METHODS: NACP was synthesized by a spray-drying technique and incorporated into a resin consisting of ethoxylated bisphenol A dimethacrylate (EBPADMA) and pyromellitic glycerol dimethacrylate (PMGDM)...
July 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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