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https://www.readbyqxmd.com/read/29676977/flared-roots-reinforced-with-bulk-fill-flowable-composite-case-report
#1
R Braz, V A Mergulhão, L R Oliveira, M S Alves, C A Canto
This article presents a case report for the treatment of a patient with a flared root. The patient was treated with a bulk-fill flowable composite. This innovative approach seems to be efficient in reinforcing flared roots. The advantages and disadvantages of the technique are presented.
May 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29627738/polymerization-shrinkage-stress-of-resin-based-dental-materials-a-systematic-review-and-meta-analyses-of-composition-strategies
#2
REVIEW
Carine Tais Welter Meereis, Eliseu Aldrighi Münchow, Wellington Luiz de Oliveira da Rosa, Adriana Fernandes da Silva, Evandro Piva
PURPOSE: A systematic review was conducted to determine whether there were composition strategies available to reduce and control polymerization shrinkage stress development in resin-based restorative dental materials. DATA SOURCES: This report was reported in accordance with the PRISMA Statement. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO...
March 23, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29594827/cytotoxic-and-biological-effects-of-bulk-fill-composites-on-rat-cortical-neuron-cells
#3
Hakan Kamalak, Aliye Kamalak, Ali Taghizadehghalehjoughi, Ahmet Hacımüftüoğlu, Kemal Alp Nalcı
The aim of this study was to investigate potential cellular responses and biological effects of new generation dental composites on cortical neuron cells in two different exposure times. The study group included five different bulk-fill flow able composites; Surefil SDR Flow, X-tra Base Flow, Venus Bulk Flow, Filtek Bulk Flow and Tetric-Evo Flow. They were filled in Teflon molds (Height: 4 mm, Width: 6 mm) and irradiated for 20 s. Cortical neuron cells were inoculated into 24-well plates. After 80% of the wells were coated, the 3 µm membrane was inserted and dental filling materials were added...
March 28, 2018: Odontology
https://www.readbyqxmd.com/read/29594349/clinical-performance-of-bulk-fill-and-conventional-resin-composite-restorations-in-posterior-teeth-a-systematic-review-and-meta-analysis
#4
Sirley Raiane Mamede Veloso, Cleidiel Aparecido Araújo Lemos, Sandra Lúcia Dantas de Moraes, Belmiro Cavalcanti do Egito Vasconcelos, Eduardo Piza Pellizzer, Gabriela Queiroz de Melo Monteiro
OBJECTIVES: The purpose of this systematic review was to compare the clinical performance of bulk-fill resin composites with conventional resin composites used for direct restorations of posterior teeth. METHODS: This review followed the PRISMA statement. This review was registered at PROSPERO (registration number CRD42016053436). A search of the scientific literature was performed by two independent reviewers using the PubMed/MEDLINE, Embase, The Cochrane Library, and Web of Science databases from commencement until January 2018...
March 28, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29576574/efficiency-of-light-curing-units-in-a-government-dental-school
#5
Hani M Nassar, Reem Ajaj, Fatin Hasanain
The light intensity of a light-curing unit is a crucial factor that affects the clinical longevity of resin composites. This study aimed to investigate the efficiency of light-curing units in use at a local governmental dental school for curing conventional and bulk-fill resin materials. A total of 166 light-curing units at three locations were examined, and the brand, type, clinic location, diameter of curing tip, tip cleanliness (using a visual score), and the output (in mW/cm2 using a digital radiometer) were recorded...
2018: Journal of Oral Science
https://www.readbyqxmd.com/read/29571907/the-effects-of-endodontic-access-cavity-preparation-design-on-the-fracture-strength-of-endodontically-treated-teeth-traditional-versus-conservative-preparation
#6
Taha Özyürek, Özlem Ülker, Ebru Özsezer Demiryürek, Fikret Yılmaz
INTRODUCTION: The aim of this study was to compare the fracture strengths of mandibular molar teeth prepared using traditional endodontic cavity (TEC) and conservative endodontic cavity (CEC) methods and restored using SDR (Dentsply Caulk, Milford, DE) and EverX Posterior (GC Dental, Tokyo, Japan) base composite materials. METHODS: A hundred mandibular first molar teeth were randomly divided into 5 groups. In group 1 (the control group), samples were kept intact...
March 20, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29570024/effect-of-mold-type-and-diameter-on-the-depth-of-cure-of-three-resin-based-composites
#7
M M AlShaafi, A AlQussier, M Q AlQahtani, R B Price
OBJECTIVE: To evaluate the effects of different mold materials, their diameters, and light-curing units on the mechanical properties of three resin-based composites (RBC). METHODS AND MATERIALS: A conventional nano-filled resin composite (Filtek Supreme Ultra, 3M Oral Care, St Paul, MN, USA) and two bulk-fill composites materials, Tetric Evoceram Bulk fill (Ivoclar Vivadent, Schaan, Liechtenstein) and Aura Bulk Fill (SDI, Bayswater, VIC, Australia), were tested...
March 23, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29570023/efficacy-of-modern-light-curing-units-in-polymerizing-peripheral-zones-in-simulated-large-bulk-fill-resin-composite-fillings
#8
N Ilie, B I Luca
The variation in micro-hardness (HV) within simulated large cavities (10 × 6 mm) filled in one increment with three bulk-fill resin-based composites (BF-RBC) was assessed by means of a universal hardness device. Modern blue and violet-blue light curing units (LCUs) were applied in three different positions, by rotating the LCU in 120° steps. The exposure distance was 3 mm. One center and two peripheral (4-mm apart from the center) HV line profiles were measured in 0.5-mm steps at 24 hours postpolymerization to calculate the depth of cure (DOC)...
March 23, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29549967/shining-a-light-on-high-volume-photocurable-materials
#9
REVIEW
William M Palin, Julian G Leprince, Mohammed A Hadis
Spatial and temporal control is a key advantage for placement and rapid setting of light-activated resin composites. Conventionally, placement of multiple thin layers (<2mm) reduces the effect of light attenuation through highly filled and pigmented materials to increase polymerisation at the base of the restoration. However, and although light curing greater than 2mm thick layers is not an entirely new phenomenon, the desire amongst dental practitioners for even more rapid processing in deep cavities has led to the growing acceptance of so-called "bulk fill" (4-6mm thick) resin composites that are irradiated for 10-20s in daily clinical practice...
March 14, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29538479/a-comparative-study-of-bulk-fill-composites-degree-of-conversion-post-gel-shrinkage-and-cytotoxicity
#10
Flávia Gonçalves, Luiza Mello de Paiva Campos, Ezequias Costa Rodrigues-Júnior, Fabrícia Viana Costa, Pamela Adeline Marques, Carlos Eduardo Francci, Roberto Ruggiero Braga, Letícia Cristina Cidreira Boaro
Bulk-fill composites are claimed to be restorative materials used in deep preparations and effectively photoactivated in layers up to 4 mm. The aim of the present study was to evaluate the degree of conversion, post-gel volumetric shrinkage, and cytotoxicity of six bulk-fill and two conventional composites. Degree of conversion was determined by FTIR spectroscopy; post-gel volumetric shrinkage was determined using the strain gauge method; and cytotoxicity in human fibroblasts was evaluated indirectly by the MTT assay...
March 8, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29533719/viscoelastic-properties-of-contemporary-bulk-fill-restoratives-a-dynamic-mechanical-analysis
#11
Jex Ong, A U Yap, J Y Hong, A H Eweis, N A Yahya
This study investigated the viscoelastic properties of contemporary bulk-fill restoratives in distilled water and artificial saliva using dynamic mechanical analysis. The materials evaluated included a conventional composite (Filtek Z350), two bulk-fill composites (Filtek Bulk-fill and Tetric N Ceram), a bulk-fill giomer (Beautifil-Bulk Restorative), and two novel reinforced glass ionomer cements (Zirconomer [ZR] and Equia Forte [EQ]). The glass ionomer materials were also assessed with and without resin coating (Equia Forte Coat)...
March 13, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29513887/bond-strength-values-of-fiberglass-post-to-flared-root-canals-reinforced-with-different-materials
#12
Thaís Emanuelle Bakaus, Yançanã Luizy Gruber, Alessandra Reis, Osnara Maria Mongruel Gomes, Giovana Mongruel Gomes
The aim of this study was to compare in vitro the bond strength (BS) between fiberglass posts and flared root canals reinforced with different materials. The roots of 48 premolars were endodontically treated. After one week, the root canals were prepared to simulate an oversized root canal, except for the positive control group (PCG), which was cemented with a prefabricated fiber post (PFP) compatible with the root canal size, simulating an ideal adaptation. The other samples (n=8/group) were used to test alternative restorative techniques for filling root canals: negative control group (NCG [PFP with a smaller diameter than of the root canal]), composite resin group - CRG, bulkfill group - BFG, self-adhesive cement group - SAG, and glass ionomer group - GIG...
March 1, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29513777/influence-of-polishing-system-on-the-surface-roughness-of-flowable-and-regular-viscosity-bulk-fill-composites
#13
Lindiane Cogo Rigo, Dimorvan Bordin, Vinicius Pavesi Fardin, Paulo G Coelho, Timothy G Bromage, Andre Reis, Ronaldo Hirata
This study evaluated the influence of polishing protocols on the surface roughness of flowable and regular bulk fill composites. Five bulk fill composites were tested: SureFil SDR Flow (SDR), Tetric EvoFlow Bulk fill (TEF), Filtek Bulk Fill Flowable (FIF), Tetric EvoCeram Bulk Fill (TEC), and Filtek Bulk Fill Posterior (FIP). Two polishing protocols were tested: Sof-Lex and Astropol. Astropol created a smoother surface for FIP (P < .05); however, the polishing protocol did not influence surface roughness on TEC (P > ...
March 7, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29506632/cytotoxic-effects-of-new-generation-bulk-fill-composites-on-human-dental-pulp-stem-cells
#14
Hakan Kamalak, Aliye Kamalak, Ali Taghizadehghalehjoughi
This study was performed to evaluate possible DNA damage in cells of human origin exposed to dental composites in vitro using a cytotoxic assay. Five bulk-fill composites were filled in molds and irradiated for 20 s. DPSCs were inoculated into 24-well plates. After the insert membrane was inserted and composites were added and the experiment was continued for 24/72 hours. In order to investigate the effects of the materials on DPSCs; its effect on apoptosis-regulating Bcl-2 gene, Human Beta-Defensins (HBDs 1-2) gene, Interleukin 6, 8, 10 expression level was examined...
February 28, 2018: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/29503987/thermal-properties-of-lauric-acid-filled-in-carbon-nanotubes-as-shape-stabilized-phase-change-materials
#15
Yanhui Feng, Runzhi Wei, Zhi Huang, Xinxin Zhang, Ge Wang
Carbon nanotubes (CNTs) filled with lauric acid (LA) as a kind of shape-stabilized phase change material were prepared and their structures and phase change properties were characterized. The results showed that the melting point and latent heat of LA confined in carbon nanotubes were lower than those of the bulk material, and both decrease as the diameters of CNTs and the filling ratios of LA decrease. Molecular dynamics (MD) simulations indicated that LA molecules form a liquid layer near pore walls and crystallize at the pore center...
March 5, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29497445/evaluation-of-cavity-size-kind-and-filling-technique-of-composite-shrinkage-by-finite-element
#16
Toloo Jafari, Homayoon Alaghehmad, Ehsan Moodi
Background: Cavity preparation reduces the rigidity of tooth and its resistance to deformation. The purpose of this study was to evaluate the dimensional changes of the repaired teeth using two types of light cure composite and two methods of incremental and bulk filling by the use of finite element method. Materials and Methods: In this computerized in vitro experimental study, an intact maxillary premolar was scanned using cone beam computed tomography instrument (SCANORA, Switzerland), then each section of tooth image was transmitted to Ansys software using AUTOCAD...
January 2018: Dental Research Journal
https://www.readbyqxmd.com/read/29466366/meta-analysis-of-the-clinical-behavior-of-posterior-direct-resin-restorations-low-polymerization-shrinkage-resin-in-comparison-to-methacrylate-composite-resin
#17
Paula de Castro Kruly, Marcelo Giannini, Renata Corrêa Pascotto, Laíse Midori Tokubo, Uhana Seifert Guimarães Suga, Any de Castro Ruiz Marques, Raquel Sano Suga Terada
Polymerization shrinkage of resin composite can compromise the longevity of restorations. To minimize this problem, the monomeric composition of composites have been modified. The objective of this study was to conduct a meta-analysis to assess the clinical behavior of restorations performed with low polymerization shrinkage resin composite in comparison with traditional methacrylates-based resin composite. This systematic review was registered at Prospero data system (CRD42015023940). Studies were searched in the electronic databases PubMed, Web of Science, Scopus, Lilacs and EMBASE according to a predefined search strategy...
2018: PloS One
https://www.readbyqxmd.com/read/29460513/the-effect-of-gingival-wall-location-on-the-marginal-seal-of-class-ii-restorations-prepared-with-a-flowable-bulk-fill-resin-based-composite
#18
P Segal, V Candotto, A Ben-Amar, M Eger, S Matalon, D Lauritano, Z Ormianer
SureFil SDR is a flowable resin-based composite that allows a single incremental bulk placement. The marginal seal of SureFil SDR at the gingival margins of class II restorations located apical to the cemento-enamel-junction (CEJ) has not been adequately evaluated compared to those located occlusal to the CEJ. Forty class II cavities were prepared in human molars. The gingival margins of 20 preparations were located 0.5 mm occlusal to the CEJ, and the other 20 preparations were located 0.5 mm apical to the CEJ...
January 2018: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29436570/the-effects-of-irradiance-and-exposure-time-on-the-surface-roughness-of-bulk-fill-composite-resin-restorative-materials
#19
Fahad I Alkhudhairy
To evaluate the surface roughness of 4 different bulk-fill resin-based composites cured using different irradiance levels. Methods: This in vitro study was performed in February 2017 to August 2017 at the College of Dentistry, King Saud University. Twenty-four specimens were prepared from each of the bulk-fill materials [Tetric N-Ceram (TNC), SonicFill (SF), Smart Dentin Replacement (SDR), and Filtek Bulk-Fill (FB)] using a brass metal mold, resulting in a total of 96 specimens, cured using a Bluephase N light curing unit...
February 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29435400/encapsulation-of-cadmium-selenide-nanocrystals-in-biocompatible-nanotubes-dft-calculations-x-ray-diffraction-investigations-and-confocal-fluorescence-imaging
#20
David G Calatayud, Haobo Ge, Navaratnarajah Kuganathan, Vincenzo Mirabello, Robert M J Jacobs, Nicholas H Rees, Craig T Stoppiello, Andrei N Khlobystov, Rex M Tyrrell, Enrico Da Como, Sofia I Pascu
The encapsulation of CdSe nanocrystals within single-walled carbon nanotube (SWNT) cavities of varying dimensions at elevated temperatures under strictly air-tight conditions is described for the first time. The structures of CdSe nanocrystals under confinement inside SWNTs was established in a comprehensive study, combining both experimental and DFT theoretical investigations. The calculated binding energies show that all considered polymorphs [(3:3), (4:4), and (4:2)] may be obtained experimentally. The most thermodynamically stable structure (3:3) is directly compared to the experimentally observed CdSe structures inside carbon nanotubes...
February 2018: ChemistryOpen
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