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Dental composite

Jasmina Martacic, Milica Kovacevic Filipovic, Suncica Borozan, Zorica Cvetkovic, Tamara Popovic, Aleksandra Arsic, Marija Takic, Vesna Vucic, Maria Glibetic
OBJECTIVES: The aim of our study was to investigate whether N-acetyl-L-cysteine (NAC) could protect stem cells from exfoliated deciduous teeth (SHED) against oxidative damage, during in vitro cultivation, to preserve regenerative potential of these cells. Accordingly, we examined the potential of cell culture supplementation with NAC in prevention of lipid peroxidation, unfavorable changes of total lipids fatty acid composition, and the effects on the activity of antioxidant enzymes. MATERIAL AND METHODS: We analyzed the extent of oxidative damage in SHED after 48 h treatment with different NAC concentrations...
February 15, 2018: Clinical Oral Investigations
Gustavo G Nascimento, Vibeke Baelum, Gunnar Dahlen, Rodrigo Lopez
OBJECTIVES: We aimed to investigate the association between dental caries and periodontitis among adolescents participating in a case-control study of periodontitis. In addition, we compared 2 analytical approaches to estimate the association: conventional regression and structural equation modelling (SEM). METHODS: Along with periodontal recordings, data were obtained on caries, just as subgingival plaque samples were collected. Sociodemographic information was collected with a questionnaire...
February 15, 2018: Community Dentistry and Oral Epidemiology
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
Manohar Bhat, Swathi Acharya, Kakarla Veera Venkata Prasad, Raghavendra Kulkarni, Anithraj Bhat, Devikripa Bhat
Background: Dental plaque is one of the predominant causes of major oral diseases. Although mechanical and chemical methods are extensively followed to control the development of plaque, plaque-related diseases still persist. Therefore, this necessitates for alternative measures of plaque control, one such alternative is photodynamic antimicrobial chemotherapy (PACT). Materials and Methods: Split mouth randomized clinical trial (CTRI/2017/03/008239) was conducted on 30 participants who reported to the hospital...
May 2017: Journal of Indian Society of Periodontology
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
Richard W Ballard, Joseph L Hagan, Suzanne E Fournier, Janice A Townsend, Mary B Ballard, Paul C Armbruster
Uncivil behavior by a faculty member or student can threaten a classroom environment and make it less conducive to learning. The aim of this study was to explore faculty behaviors that dental faculty and students perceive to be uncivil when exhibited in the classroom and clinic. In 2015, all faculty, administrators, and students at a single academic dental institution were invited to participate in an electronic survey that used a five-point Likert scale for respondents to indicate their agreement that 33 faculty behaviors were uncivil...
February 2018: Journal of Dental Education
Robert C Shields, Lin Zeng, David J Culp, Robert A Burne
Transposon mutagenesis coupled with next-generation DNA sequencing (Tn-seq) is a powerful tool for discovering regions of the genome that are required for the survival of bacteria in different environments. We adapted this technique to the dental caries pathogen Streptococcus mutans UA159 and identified 11% of the genome as essential, with many genes encoding products required for replication, translation, lipid metabolism, and cell wall biogenesis. Comparison of the essential genome of S. mutans UA159 with those of selected other streptococci for which such information is available revealed several metabolic pathways and genes that are required in S...
January 2018: MSphere
Egle Bendoraitiene, Sandra Zemgulyte, Marija Borisovaite
Background: Avulsion of the permanent teeth is one of the most serious oral health problems among active children and adolescents. Traumatized patients require immediate and correct treatment in order to restore damaged structures and function that have major impact on daily patient's life. As a result, proper guidelines and fast treatment methods are necessary. This case report discusses treatment of maxillary right central incisor with an open apex that had been avulsed and replanted...
October 2017: Journal of Oral & Maxillofacial Research
Inesa Astramskaite, Ginnady Pinchasov, Albinas Gervickas, Dalius Sakavicius, Gintaras Juodzbalys
Objectives: There aren't any objective methods that may help in standard evaluation of oral surgery patient's psycho-emotional status. Without any standardized evaluation, two main problems appear: heterogeneity between studies and ineffective patient's evaluation. Therefore, Universal Scale in Oral Surgery (USOS) for patient's psycho-emotional status rating has previously been proposed by authors. The aim of present study is to assess the clinical effectivity and validate the Universal Scale in Oral Surgery in case of outpatient tooth extraction for adult healthy patients...
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
Vincent Offermanns, Ole Z Andersen, Gregor Riede, Michael Sillassen, Christian S Jeppesen, Klaus P Almtoft, Heribert Talasz, Caroline Öhman-Magi, Bernd Lethaus, Rene Tolba, Frank Kloss, Morten Foss
Numerous in vivo, in vitro and clinical studies report on beneficial effects of strontium with respect to increased bone growth. Based on this knowledge the aim of this study was to evaluate early and late osseointegration stages of functionalized titanium implants showing sustained release of strontium (Sr) and further investigate its potential systemic effect. Strontium functionalized (Ti-Sr-O) and Grade 4 (Control) titanium implants were inserted in the femoral condyle of New Zealand White rabbits. The Ti-Sr-O coating was characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectrometry (EDX) for structure, coating thickness and chemical composition...
February 6, 2018: Acta Biomaterialia
Paula Chaves, Joao Oliveira, Alex Haas, Ruy Carlos Ruver Beck
Polymeric nanoparticles are promising drug delivery systems due to their physicochemical properties, which may be explored to improve the treatment and prevention of several diseases, including oral conditions. Moreover, the pharmacological effects of polymers may be improved by nanostructuration. Therefore, this article supply a detailed review of the studies published between 2010 and 2017 covering the use of polymeric nanoparticles in the treatment and/or prevention of oral diseases. A brief description about the dental biofilm and oral diseases is presented in first part of the article...
February 8, 2018: Current Pharmaceutical Design
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
Célia Márcia Fernandes Maia, Renato Assis Machado, Vera Lúcia Gil-da-Silva-Lopes, Elaine Lustosa-Mendes, Priscila Hae Hyun Rim, Verônica Oliveira Dias, Daniella Reis Barbosa Martelli, Luciano Sólia Nasser, Ricardo D Coletta, Hercílio Martelli-Júnior
Jalili syndrome (JS) is an autosomal recessive disease characterized by a combination of cone-rode retinal dytrophy (CRD) and amelogenesis imperfect (AI). Mutations in cyclin and CBS domain divalent metal cation transport mediator 4 (CNNM4) gene cause JS. Here we described 2 families (3 members) affected by JS. In the first family, JS was caused by the homozygous p.Leu324Pro (c.971T > C) missense mutation and the affected patient developed both CRD and AI. In the second family, a specific combination of a compound heterozygous mutation was found - the p...
February 5, 2018: European Journal of Medical Genetics
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