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https://www.readbyqxmd.com/read/28532089/a-poly-2-hydroxyethyl-methacrylate-based-resin-improves-the-dentin-remineralizing-ability-of-calcium-silicates
#1
Paola Taddei, Carlo Prati, Maria Giovanna Gandolfi
Bioactive polymeric composites have received great attention for their capability to remineralize the dentin tissue. This study was aimed at evaluating if a poly(HEMA-co-TEGDMA) resin (HEMA: 2-hydroxyethyl methacrylate; TEGDMA: triethyleneglycol dimethacrylate) may increase the in vitro apatite forming ability of a calcium silicate cement (CaSi), in view of developing a hydrophilic light-curable composite bio-remineralizing restorative material (R-CaSi). To this purpose, the following experiments were carried out: (1) In vitro apatite forming ability of R-CaSi and CaSi was comparatively assessed by micro-Raman spectroscopy after immersion of the cement disks in Dulbecco's Phosphate Buffered Saline (DPBS) at 37°C for 1-28days; (2) Previously demineralized human dentin slices were soaked for 7days in close contact with the CaSi and R-CaSi cements as well as poly(HEMA), poly(TEGDMA) and poly(HEMA-co-TEGDMA), and then were comparatively analyzed by IR spectroscopy...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532050/full-in-vitro-analyses-of-new-generation-bulk-fill-dental-composites-cured-by-halogen-light
#2
Tuçe Hazal Tekin, Aysel Kantürk Figen, Pınar Yılmaz Atalı, Bilge Coşkuner Filiz, Mehmet Burçin Pişkin
The objective of this study was to investigate the full in-vitro analyses of new-generation bulk-fill dental composites cured by halogen light (HLG). Two types' four composites were studied: Surefill SDR (SDR) and Xtra Base (XB) as bulk-fill flowable materials; QuixFill (QF) and XtraFill (XF) as packable bulk-fill materials. Samples were prepared for each analysis and test by applying the same procedure, but with different diameters and thicknesses appropriate to the analysis and test requirements. Thermal properties were determined by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC) analysis; the Vickers microhardness (VHN) was measured after 1, 7, 15 and 30days of storage in water...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530844/developing-a-new-generation-of-antimicrobial-and-bioactive-dental-resins
#3
L Cheng, K Zhang, N Zhang, M A S Melo, M D Weir, X D Zhou, Y X Bai, M A Reynolds, H H K Xu
Dental caries is prevalent, and secondary caries causes restoration failures. This article reviews recent studies on developing a new generation of bioactive resins with anticaries properties. Extensive effects were made to develop new antimicrobial composites, bonding agents, and other resins containing quaternary ammonium methacrylates to suppress plaque buildup and bacterial acid production. The effects of alkyl chain length and charge density and the antimicrobial mechanisms for chlorhexidine, nano-silver, quaternary ammonium methacrylates, and protein-repellent agents were discussed...
May 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28530385/polymeric-3d-printed-functional-microcantilevers-for-biosensing-applications
#4
Stefano Stassi, Erika Fantino, Roberta Calmo, Annalisa Chiappone, Matteo Gillono, Davide Scaiola, Candido Fabrizio Pirri, Carlo Ricciardi, Alessandro Chiado', Ignazio Roppolo
The present work shows for the first time the production of mass sensitive polymeric biosensors by 3D printing technology with intrinsic functionalities. We demonstrate the feasibility of mass sensitive biosensors in the form of microcantilever in a one-step printing process, using acrylic acid as functional co-monomer for introducing a controlled amount of functional groups that can covalently immobilize the biomolecules onto the polymer. The effectiveness of the application of 3D printed microcantilevers as biosensors is then demonstrated with their implementation in a standard immunoassay protocol...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28528931/evaluation-of-alternative-monomers-to-hema-for-dental-applications
#5
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/28526444/the-development-of-a-novel-shade-selection-program-for-fixed-shade-translucent-dental-materials
#6
Melody N Carney, William M Johnston
OBJECTIVES: The objective of this study was to develop a shade selection program that predicts the shade choice with the smallest CIEDE2000 color difference for dental composite resin restorations when given a backing and target shade. By utilizing previously generated regression models, a database of spectral reflectance information, and principles of Kubelka-Munk layering, a highly accurate shade selection program was designed. METHODS: Using SAS 9.3 Statistical Analysis Software, a shade selection program was developed that incorporated Kubelka-Munk layering data of Herculite Ultra and Estelite Omega composite resins from a characterized database of absorption and scattering information...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28526054/assessing-degradation-of-composite-resin-cements-during-artificial-aging-by-martens-hardness
#7
Stefan Bürgin, Nadja Rohr, Jens Fischer
BACKGROUND: Aim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging. METHODS: Four cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to allow complete polymerization (baseline). Subsequently the specimens were artificially aged by water storage at 37 °C or thermal cycling (n = 6)...
May 19, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/28524243/bulk-filled-posterior-resin-restorations-based-on-stress-decreasing-resin-technology-a-randomized-controlled-6-year-evaluation
#8
Jan W V van Dijken, Ulla Pallesen
This randomized study evaluated a flowable resin composite bulk-fill technique in posterior restorations and compared it intraindividually with a conventional 2-mm resin composite layering technique over a 6-yr follow-up period. Thirty-eight pairs of Class II restorations and 15 pairs of Class I restorations were placed in 38 adults. In all cavities a single-step self-etch adhesive (Xeno V) was applied. In the first cavity of each pair, the flowable resin composite (SDR) was placed, in bulk increments of up to 4 mm...
May 19, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28522161/effect-of-blue-and-violet-light-on-polymerization-shrinkage-vectors-of-a-cq-tpo-containing-composite
#9
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/28518187/in-vitro-shock-absorption-tests-on-implant-supported-crowns-influence-of-crown-materials-and-luting-agents
#10
Martin Rosentritt, Sibylle Schneider-Feyrer, Michael Behr, Verena Preis
PURPOSE: To investigate the force absorption capacity of implant-supported crowns made of different restorative materials and connected to abutments with different luting agents. MATERIALS AND METHODS: Molar crowns were milled of different computer-aided design/computer-aided manufacture materials (n = 8 crowns per material): polymethyl methacrylate, polyether ether ketone, composite, lithium disilicate, titanium, and zirconia. Crowns were mounted on titanium implant replicas using different luting agents: uncemented, temporarily cemented (zinc oxide-eugenol cement), conventionally cemented (zinc oxide phosphate cement), and adhesively bonded...
May 18, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28513897/quality-and-survival-of-direct-light-activated-composite-resin-restorations-in-posterior-teeth-a-5-to-20-year-retrospective-longitudinal-study
#11
REVIEW
Ernesto Borgia, Rosario Baron, Jose Luis Borgia
PURPOSE: To analyze the clinical success of direct light-activated composite resin restorations in posterior teeth. The quality of the margins and occlusal surfaces were evaluated, as well as their survival, according to their extensions and locations. The clinical performance of posterior composite resin restorations with different compositions were compared. All restorations were performed by the first author in his private practice, in a 5- to 20-year period. MATERIALS AND METHODS: Several types of composite resins, provided by different manufacturers, were placed in posterior teeth, after isolation with rubber dams...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513894/the-dentoalveolar-prosthesis-a-novel-approach-in-the-reconstruction-of-hard-and-soft-tissue-deficiencies
#12
James K Doll, Peter Barndt, Gerald Grant
A clinical problem commonly encountered by the advanced restorative dentist is a requirement to replace missing teeth and the supporting alveolus in areas adjacent to healthy or manageable dentition. A potential solution could utilize a dentoalveolar prosthesis fabricated on two or more implants in the edentulous area. The implant substructure, or framework, may be cast, milled, or selectively laser melted from a variety of metals. A superstructure, or ceramic overlay incorporating a ceramic or composite resin gingival tissue component, is constructed to fit over the implant substructure and luted to the substructure with resin cement...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513786/3-year-survival-rates-of-retained-composite-resin-and-art-sealants-using-two-assessment-criteria
#13
Leandro Augusto Hilgert, Soraya Coelho Leal, Gabriela Mesquita Lopes Freire, Jan Mulder, Jo E Frencken
The aim was to test the null-hypothesis that there is no difference in the cumulative survival rate of retained composite resin (CR) sealants and a high-viscosity glass-ionomer Atraumatic Restorative Treatment (ART) sealant in first permanent molars calculated according to the traditional and the modified retention assessment criteria over a period of 3 years. This cluster-randomized controlled clinical trial consisted of 123 schoolchildren, 6-7-years-old. At baseline, high-caries risk pits and fissures of fully erupted first permanent molars were treated with CR and ART sealants...
May 4, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28513520/clinical-assessment-of-mineral-trioxide-aggregate-in-the-treatment-of-deep-carious-lesions
#14
U K Vural, A Kiremitçi, S Gökalp
OBJECTIVE: This clinical study aimed to assess the effectiveness of mineral trioxide aggregate (MTA) and calcium hydroxide (Ca[OH]2) in the treatment of deep carious lesions using the direct complete caries excavation technique. SUBJECTS AND METHODS: Hundred permanent molars/premolars were capped either with Ca (OH)2 (n = 49) or MTA (n = 51) and restored with composite resin in 73 patients. Periapical radiographs were taken prior to the treatment, at 6 months and 12 months...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28513514/efficacy-of-polishing-kits-on-the-surface-roughness-and-color-stability-of-different-composite-resins
#15
H Kocaagaoglu, T Aslan, A Gürbulak, H Albayrak, Z Taşdemir, H Gumus
OBJECTIVE: Different polishing kits may have different effects on the composite resin surfaces. The aim of this study was to evaluate the surface roughness and color stability of four different composites which was applied different polishing technique. MATERIALS AND METHODS: Thirty specimens were made for each composite resin group (nanohybrid, GrandioSo-GS; nanohybrid, Clearfil Majesty Esthetic-CME; hybrid, Valux Plus-VP; micro-hybrid, Ruby Comp-RC; [15 mm in diameter and 2 mm height]), with the different monomer composition and particle size from a total of 120 specimens...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28512271/staining-beverages-and-cigarette-smoke-on-composite-resin-and-human-tooth-fluorescence-by-direct-spectrometry
#16
Tânia Mara da Silva, Natália Yamachita da Silva, Lucélia Lemes Gonçalves, Leandro Procópio Alves, Adjaci Uchoa Fernandes, Sérgio Eduardo de Paiva Gonçalves
INTRODUCTION: This study evaluated the fluorescence intensity (FI) of different brands of composite resins (CRs) and compare those values with the FI of human tooth, under the action of cigarette smoke (CI), coffee (CA), and soft drink (CO), measured by direct spectrometry. MATERIALS AND METHODS: A total of 30 specimens of each brand (Filtek Z350, Esthet-X, Amelogen, Durafill) were made. Others 30 tooth specimens (3 mm/diameter) were obtained from human molars using a trephine bur...
May 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28511509/comparative-evaluation-of-colour-stability-and-surface-hardness-of-methacrylate-based-flowable-and-packable-composite-in-vitro-study
#17
Saron Ramesh Nair, Nandini Thipannanavar Niranjan, Arun Jayasheel, Deepak Bythnal Suryakanth
INTRODUCTION: With the advent of new technology in material sciences in recent years, the quality of composite resin restorations has improved; however, discolouration and wear of composite resin materials remains to be a major problem in long-term clinical studies. AIM: The aim of the present study was to compare the colour stability and surface hardness of methacrylate based flowable nano composite with methacrylate based packable nano composite. MATERIALS AND METHODS: The difference in colour stability and microhardness of the three composites: G aenial Universal Flo (GC India), Filtek Z350XT (3MESPE) and Tetric N Ceram (Ivoclar Vivadent) were evaluated...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28510377/retrospective-study-of-the-survival-and-patient-satisfaction-with-composite-dahl-restorations-in-the-management-of-localised-anterior-tooth-wear
#18
Ayman Aljawad, Jeremy Simon Rees
OBJECTIVE: This retrospective study was undertaken to evaluate the clinical performance of direct composite restorations placed at an increased vertical dimension to manage localised anterior tooth wear using the Dahl approach. SUBJECTS AND METHODS: Two hundred and ninety six restorations were placed at an increased OVD in 41 subjects with localized anterior Tooth Surface Loss (TSL) were included. Survival analysis was carried out at three levels, major failure only, minor failure only and all types of failure...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28510375/the-effect-of-irradiation-distance-on-light-transmittance-and-vickers-hardness-ratio-of-two-bulk-fill-resin-based-composites
#19
Zahra Almuallem, Sinead McDonnell, Antoniella Busuttil-Naudi, Ario Santini
The aims of this study were to assess the light energy transmission and Vickers hardness (VH) ratio of two bulk-fill resin-based composites (RBCs) (Tetric EvoCeram and Filtek) cured at different distances between the light curing unit's (LCU) tip and the surface of the restoration (T-S) using either a Bluephase G2, Bluephase® 'turbo tip' or Bluephase Style LCU. Samples were cured from the top at T-S distances of 2mm, 6mm and 10mm for 20 seconds. A MARC-Resin-Calibrator™ recorded the transmitted irradiance reaching the bottom of the sample, in real time...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28510374/qualitative-beam-profiling-of-light-curing-units-for-resin-based-composites
#20
Thomas Haenel, Berenika Hausnerová, Johannes Steinhaus, Ing Bernhard Moeginger
This study investigates two technically simple methods to determine the irradiance distribution of light curing units that governs the performance of a visible-light curing resin-based composites. Insufficient light irradiation leads to under-cured composites with poor mechanical properties and elution of residual monomers. The unknown irradiance distribution and its effect on the final restoration are the main critical issues requiring highly sophisticated experimental equipment. The study shows that irradiance distributions of LCUs can easily be determined qualitatively with generally available equipment...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
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