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dental materials

P Bargavi, S Chitra, D Durgalakshmi, P Rajashree, S Balakumar
Bioglass 45S5 (45% SiO2-24.5% NaO-24.5% CaO-6% P2O5) is a unique bioactive material, which is being used for bone and dental substitution. This system has been highly preferred for its osteoconductive and osteoinductive performance. Despite its attractive bioactivity, there are limitations in using this material for orthopedic and dental applications due to its poor processability and mechanical strength. To improve the load-sharing and stress distribution, TiO2 nanoparticles have been introduced into the nanoBioglass (nBG) by sol-gel method...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Suganthan Veerachamy, Pearlin Hameed, Dwaipayan Sen, Sitaram Dash, Geetha Manivasagam
Ceramic oxides such as alumina and zirconia are used to fabricate dental and orthopedic implants. However, their usage is limited as they fail due to low fracture toughness. To overcome this issue, ceramic coatings on metallic implants is attempted to have a combined effect of ceramics and metallic materials. This paper reports on the microstructure, phase analysis, mechanical properties, osseointegration and antibacterial activity of three different wear-resistant coatings developed on Ti-6Al-4V alloy which is used widely as orthopedic and dental implants...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Chirag J Chauhan, Darshana N Shah, Foram B Sutaria
Background: As implant site preparation and bone are critical precursors to primary healing, thermal and mechanical damage to the bone must be minimized during the preparation of the implant site. Moreover, excessively traumatic surgery can adversely affect the maturation of bone tissue at the bone/implant interface and consequently diminish the predictability of osseointegration. So, this study was carried out to evaluate the various biological and mechanical factors responsible for heat generation during osteotomy site preparation to reduce the same for successful osseointegration of dental implants...
January 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Varsha Ajit Sangle, V K Pooja, Anuja Holani, Nishat Shah, Mayur Chaudhary, Sneha Khanapure
Context: The reactive lesions are relatively common in the oral cavity because of the frequency with which the tissues are injured. They often result from a known stimulus or injury such as dental plaque, calculus, or foreign material. Aims: The aim of this study was to review the clinicopathologic features of reactive hyperplastic lesions (RHLs) of the oral cavity at MIDSR, Dental College and Hospital, Latur, Maharashtra, and to compare these data with those of previously reported studies...
January 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
S Huang, M Podgórski, X Zhang, J Sinha, M Claudino, J W Stansbury, C N Bowman
Step-growth thiol-Michael photopolymerizable resins, constituting an alternative chemistry to the current methacrylate-based chain-growth polymerizations, were developed and evaluated for use as dental restorative materials. The beneficial features inherent to anion-mediated thiol-Michael polymerizations were explored, such as rapid photocuring, low stress generation, ester content tunability, and improved mechanical performance in a moist environment. An ester-free tetrafunctional thiol and a ultraviolet-sensitive photobase generator were implemented to facilitate thiol-Michael photopolymerization...
February 1, 2018: Journal of Dental Research
Chunyanut Wongkhum, Wilaiwan Chotigeat, Ureporn Kedjarune-Leggat
Vascular endothelial growth factor (VEGF)-A is a potential signaling protein that may promote angiogenesis. VEGF also helps cells survive in stressfull or hazardous conditions. The present study aimed to compare the effect of VEGF with translationally controlled tumor protein (TCTP), an anti‑apoptotic protein in human dental pulp cells (HDPCs), following exposure to 2‑hydroxyethyl methacrylate (HEMA), which is a major residual monomer from resin restorative dental materials. Cell viability, alkaline phosphatase (ALP) activity, mineralization and gene expressions for odontogenic and osteogenic differentiation markers of HDPCs were investigated, following exposure to HEMA and in combination with TCTP and VEGF...
February 12, 2018: Molecular Medicine Reports
Renzo Guarnieri, Luca Testarelli, Luigi Stefanelli, Francesca De Angelis, Francesca Mencio, Giorgio Pompa, Stefano Di Carlo
Objectives: The present paper reports data of a randomized study aimed to analyse and compare the histologic and histomorphometric aspects of bone healing in extraction sites covered with collagen membrane alone or associated with porcine-derived bone graft. Material and Methods: Thirty patients, with single extraction sockets without severe bone wall defects in the premolar/molar region, were included. Ten extraction sockets were grafted with porcine-derived bone and covered with collagen membrane (group 1), 10 sites were covered with collagen membrane alone (group 2), and 10 sites healed spontaneously (group 3)...
October 2017: Journal of Oral & Maxillofacial Research
Yurdanur Uçar, İpek Aysan Meriç, Orhun Ekren
PURPOSE: To compare the fracture mechanics, microstructure, and elemental composition of lithography-based ceramic manufacturing with pressing and CAD/CAM. MATERIALS AND METHODS: Disc-shaped specimens (16 mm diameter, 1.2 mm thick) were used for mechanical testing (n = 10/group). Biaxial flexural strength of three groups (In-Ceram alumina [ICA], lithography-based alumina, ZirkonZahn) were determined using the "piston on 3-ball" technique as suggested in test Standard ISO-6872...
February 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Marilia Mattar de Amoêdo Campos Velo, Ana Laura Herrera Farha, Paulo Sérgio da Silva Santos, Aymée Shiota, Simone Zuquerato Sansavino, Ana Tarsila Souza, Heitor Marques Honório, Linda Wang
OBJECTIVES: Post-radiation dental lesions affect mainly the cervical area of the tooth. Until now, there are quite few evidences regarding the effects of radiation exposure on root dentin breakdown. To better understand this effect, we used human root dentin specimens obtained from third molars from similarly aged individuals. MATERIALS AND METHODS: Twenty specimens were analyzed by the surface hardness (SH), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) to evaluate the baseline properties of their root dentin...
February 11, 2018: Clinical Oral Investigations
Veeramachaneni Chandrasekhar, Laharika Rudrapati, Vijetha Badami, Muralidhar Tummala
Polymerization shrinkage is one of the dental clinician's main entanglements when placing resin-based composite restorations. None of the method can assure a perfectly sealed restoration for adhesive restorative materials; clinicians must abode problems of polymerization shrinkage and its possible ill effects. The objective of this article is to review different incremental techniques that can ruin the polymerization shrinkage stress of direct composite restoration.
November 2017: Journal of Conservative Dentistry: JCD
Omar Osama Shaalan, Eman Abou-Auf, Amira Farid El Zoghby
The purpose of this systematic review was to evaluate clinical performance of flowable composite in carious and noncarious lesions. An electronic search was conducted using specific databases (PubMed, Embase, Cochrane Library, and LILACS) through March 2017. Clinical trials for restoration of carious and noncarious lesions were included with no date restrictions; follow-up was 6 months at least and dental restorations were evaluated using the United States Public Health Service criteria. The systematic search generated 908 papers, of which 35 papers were included for full-text review...
November 2017: Journal of Conservative Dentistry: JCD
Stevan M Cokic, Radu C Duca, Jan De Munck, Peter Hoet, Bart Van Meerbeek, Mario Smet, Lode Godderis, Kirsten L Van Landuyt
OBJECTIVE: Accurate knowledge of the quantity of released monomers from composites is important. To evaluate the elution of monomers, polymerized composites are typically immersed in an extraction solvent. The objective was to determine whether the volume of extraction solvent and the immersion time influences monomer leachability from dental composite materials. METHODS: Composite disks of two commercial composites, (Filtek Supreme XTE, 3M ESPE and G-aenial Universal Flo, GC) were prepared...
February 8, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Amber A Miller, Koyo Takimoto, James Wealleans, Anibal Diogenes
INTRODUCTION: There is a complex interaction between biomaterials placed as a coronal barrier with stem cells and dentin in regenerative procedures. In this study, the effect of Biodentine (BD; Septodont, Saint-Maurdes-Fossés, France), Endosequence BC Root Repair Material-Putty (ES; Brasseler, Savannah, GA), Endosequence BC Root Repair Material-Putty Fast set (ES-fast, Brasseler), and ProRoot (Dentsply Tulsa Dental Specialties, Johnson City, TN) mineral trioxide aggregate (MTA) on the viability and differentiation of stem cells of the apical papilla (SCAP) was evaluated using an ex vivo dentin disk model...
February 6, 2018: Journal of Endodontics
Niwut Juntavee, Apa Juntavee, Phuwiwat Saensutthawijit
AIM: This study evaluated the effect of light-emitting diode (LED) illumination bleaching technique on the surface nanohardness of various computer-aided design and computer-aided manufacturing (CAD/CAM) ceramic materials. MATERIALS AND METHODS: Twenty disk-shaped samples (width, length, and thickness = 10, 15, and 2 mm) were prepared from each of the ceramic materials for CAD/CAM, including Lava™ Ultimate (LV), Vita Enamic® (En) IPS e.max® CAD (Me), inCoris® TZI (IC), and Prettau® zirconia (Pr)...
February 1, 2018: Journal of Contemporary Dental Practice
Sheryl Zajdowicz, Han Byul Song, Austin Baranek, Christopher N Bowman
OBJECTIVE: For the past several decades, the resins used in dental restorations have been plagued with numerous problems, including their implication in biofilm formation and secondary caries. The need for alternative resins is critical, and evaluation of biofilm formation on these resins is essential. The aim of this study was to evaluate in vitro biofilm formation on the surface of novel copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC)-based resins and composites. METHODS: CuAAC-based resins/composites made from varying azide monomers and different copper concentrations were compared with BisGMA-TEGDMA resins/composites that served as the control...
February 5, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Marcela C Rodrigues, Marina D S Chiari, Yvette Alania, Livia C Natale, Victor E Arana-Chavez, Marcia M Meier, Victória S Fadel, Flavio M Vichi, Thiago L R Hewer, Roberto R Braga
OBJECTIVES: This study describes the synthesis of brushite nanoparticles (CaHPO4·2H2O) functionalized with triethylene glycol dimethacrylate (TEGDMA) and their application in dental restorative composites with remineralizing capabilities. METHODS: Nanoparticles were synthesized, with TEGDMA being added to one of the precursor solutions at three different molar ratios (0:1, 0.5:1 and 1:1, in relation to the ammonium phosphate precursor). Then, they were added (10 vol%) to a photocurable dimethacrylate matrix containing 50 vol% of reinforcing glass particles...
February 5, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Daniel Koester, Benjamin Wolbert, Marcel Schulte, Maik A Jochmann, Torsten Claus Schmidt
The sugar replacement compound xylitol has gained increasing attention due to its use in many commercial food products, dental hygiene articles and pharmaceuticals. It can be classified by the origin of the raw material used for the production. The traditional "birch xylitol" is considered a premium product in contrast to xylitol produced from agriculture byproducts such as corn husks or sugar cane straw. Bulk stable isotope analysis (BSIA) as well as compound-specific stable isotope analysis (CSIA) by LC-IRMS for chewing gum extracts was used to determine δ13C isotope signatures for xylitol...
February 8, 2018: Journal of Agricultural and Food Chemistry
Rafał Pokrowiecki, Krzysztof Pałka, Agnieszka Mielczarek
AIM: The studies on tooth structure provided basis for nanotechnology-based dental treatment approaches known as nanodentistry which aims at detection and treatment of oral pathologies, such as dental caries and periodontal diseases, insufficiently being treated by conventional materials or drugs. This review aims at defining the role of nanodentistry in the medical area, its potential and hazards. MATERIALS & METHODS: To validate these issues, current literature on nanomaterials for dental applications was critically reviewed...
February 8, 2018: Nanomedicine
Alethea Liens, Aurélien Etiemble, Pascaline Rivory, Sandra Balvay, Jean-Marc Pelletier, Sandrine Cardinal, Damien Fabrègue, Hidemi Kato, Philippe Steyer, Tais Munhoz, Jerome Adrien, Nicolas Courtois, Daniel J Hartmann, Jérôme Chevalier
Ti40Zr10Cu36Pd14 Bulk Metallic Glass (BMG) appears very attractive for future biomedical applications thanks to its high glass forming ability, the absence of toxic elements such as Ni, Al or Be and its good mechanical properties. For the first time, a complete and exhaustive characterization of a unique batch of this glassy alloy was performed, together with ISO standard mechanical tests on machined implant-abutment assemblies. The results were compared to the benchmark Ti-6Al-4V ELI (Extra-Low-Interstitial) to assess its potential in dental implantology...
February 6, 2018: Materials
Xinxuan Zhou, Suping Wang, Xian Peng, Yao Hu, Biao Ren, Mingyun Li, Liying Hao, Mingye Feng, Lei Cheng, Xuedong Zhou
The objective of this study was to evaluate the performance changes of three restorative materials before and after three different aging treatments: storage in distilled water, Streptococcus mutans (S. mutans) and oral salivary microbes suspensions for one month. Resin composite (RC), giomer and glass ionomer cement (GIC) were chosen for aging procedures. Surface morphology, roughness average (Ra), color changes and mechanical properties were all determined before and after aging respectively. Biomass and metabolism difference of early attached biofilm on the material surface were tested through 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and lactic acid measurement...
January 26, 2018: Journal of the Mechanical Behavior of Biomedical Materials
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