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https://www.readbyqxmd.com/read/29436570/the-effects-of-irradiance-and-exposure-time-on-the-surface-roughness-of-bulk-fill-composite-resin-restorative-materials
#1
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
#2
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
https://www.readbyqxmd.com/read/29394140/effect-of-sonic-resin-composite-delivery-on-void-formation-assessed-by-micro-computed-tomography
#3
R Hirata, R R Pacheco, E Caceres, M N Janal, M F Romero, M Giannini, P G Coelho, F A Rueggeberg
OBJECTIVES: The aim of this study was to quantify the internal void volume formation in commercially available, resin composites inserted using conventional or sonic insertion methods, and analyzed using three-dimensional (3D) micro-computed tomography (μCT). METHODS AND MATERIALS: Four resin composites were evaluated: one conventional (Herculite, Ultra, Kerr Corporation, Orange, CA, USA), one flowable bulk fill (SureFil SDR Flow, Dentsply International, York, PA, USA), and two packable bulk fill (SonicFill, Kerr Corporation, and Tetric EvoCeram Bulk Fill, Ivoclar Vivadent Inc, Schaan, Liechtenstein)...
February 2, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29386787/fracture-resistance-of-posterior-teeth-restored-with-high-viscosity-bulk-fill-resin-composites-in-comparison-to-the-incremental-placement-technique
#4
Vibha Hegde, Amrita Vilas Sali
Aim: Comparative evaluation of the fracture resistance of maxillary premolar teeth restored with two high-viscosity bulk-fill composites and incrementally placed composite. Materials and Methods: Seventy-five freshly extracted maxillary premolar teeth were selected. Fifteen specimens served as positive control (Group 1). Mesio-occluso-distal cavity preparation was prepared on the rest of the specimens. These specimens were further divided into four groups: unrestored teeth (Group 2), teeth restored with incrementally placed nanocomposite (Group 3), teeth restored with high-viscosity bulk-fill giomer (Group 4), and teeth restored with high-viscosity bulk-fill nanocomposite (Group 5)...
September 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29386778/to-evaluate-and-compare-the-effect-of-different-light-curing-modes-and-different-liners-on-cuspal-deflection-in-premolar-teeth-restored-with-bulk-filled-or-incrementally-filled-composite-measured-at-different-time-intervals
#5
Parul Mour Agarwal, Sonali Taneja, Mohit Kumar
Aim: The aim of this study is to evaluate and to compare the effect of different light-curing modes and different liners on cuspal deflection in premolar teeth restored with bulk filled or incrementally filled composite measured at different time intervals. Materials and Methods: The study was divided into two parts (Part 1-different curing modes, Part 2-different liner) each with sixty extracted human upper premolar teeth with standardized large mesio-occlusal-distal cavities prepared...
September 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29375091/assessment-of-cuspal-deflection-and-volumetric-shrinkage-of-different-bulk-fill-composites-using-non-contact-phase-microscopy-and-micro-computed-tomography
#6
Martin Prager, Mark Pierce, Pablo J Atria, Camila Sampaio, Eduardo Cáceres, Mark Wolff, Marcelo Giannini, Ronaldo Hirata
The understanding of cuspal deflection and volumetric shrinkage of resin composites is necessary to assess and improve the placement techniques of resin-based materials. The aim of this study was to investigate the cuspal deflection and its relationship with volumetric polymerization shrinkage of different bulk-fill resin composites. The investigation was conducted using non-contact phase microscopy and micro-computed tomography. Thirty custom-milled aluminum blocks were fabricated for microscopy analysis and thirty-six tooth models with standardized Class I cavities were used for micro-computed tomography analysis...
January 26, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/29364336/structural-and-mechanical-properties-of-a-giomer-based-bulk-fill-restorative-in-different-curing-conditions
#7
Mustafa Sarp Kaya, Meltem Bakkal, Ali Durmus, Zehra Durmus
The main goal of this study was to compare the polymerization degree of bulk-fill giomer resin cured with three different light-curing units (LCUs): a polywave third-generation (Valo); a monowave (DemiUltra: DU); and a second-generation LED (Optima 10: Opt) LCUs by using structural and mechanical properties. Giomer samples of 2 and 4 mm cured with three LCUs were employed in vitro analysis. The degree of curing (DC%) was determined with Fourier-Transform Infrared Spectroscopy (FTIR). Microstructural features were observed with scanning electron microscopy (SEM)...
January 18, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29358529/diametral-tensile-strength-flexural-strength-and-surface-microhardness-of-bioactive-bulk-fill-restorative
#8
Ali Alrahlah
AIM: The aim was to perform comparative analysis of bioactive, contemporary bulk-fill resin-based composites (RBCs) and conventional glass-ionomer materials for flexural strength (FS), diametral tensile strength (DTS), and Vickers hardness number (VHN) in the presence of thermocycling. MATERIALS AND METHODS: Five restorative materials [Tetric N-Ceram Bulk Fill; smart dentin replacement (SDR) Flowable Material; Bioactive restorative material (ACTIVA Bulk Fill); Ketac Universal Aplicap; and GC Fuji II] were evaluated for DTS, FS, and VHN...
January 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29324684/comparative-effect-of-self-or-dual-curing-on-polymerization-kinetics-and-mechanical-properties-in-a-novel-dental-resin-based-composite-with-alkaline-filler-running-title-resin-composites-with-alkaline-fillers
#9
Nicoleta Ilie
Dental bulk-fill restorations with resin-composites (RBC) are increasing in popularity, but doubts concerning insufficient curing in depth still disconcert clinicians. An alternative might be offered by modern dual-cured RBCs, which additionally provide bioactive properties. This study assessed the impact of additional light-curing on polymerization kinetics, the degree of conversion (DC) and mechanical properties of a novel, dual-cured RBC with alkaline fillers. Since the bioactivity of a material often implies a release of compounds, the mechanical stability in simulated clinical environments was also evaluated...
January 11, 2018: Materials
https://www.readbyqxmd.com/read/29284100/cuspal-deflection-in-premolar-teeth-restored-with-bulk-fill-resin-based-composite-materials
#10
M M Elsharkasi, J A Platt, N B Cook, G H Yassen, B A Matis
The present study investigated the effect of three high-viscosity bulk-fill resin-based composite materials on cuspal deflection in natural teeth. Thirty-two sound maxillary premolar teeth with large slot mesio-occlusal-distal cavities were distributed into four groups (n=8). Three groups were restored with bulk-fill resin composite materials (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent, Schaan, Liechtenstein; x-tra fil, VOCO, Cuxhaven, Germany; and SonicFill, Kerr, Orange, CA, USA) in a single 4-mm increment...
January 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29284096/real-time-light-transmittance-monitoring-for-determining-polymerization-completeness-of-conventional-and-bulk-fill-dental-composites
#11
M Par, I Repusic, H Skenderovic, E Klaric Sever, D Marovic, Z Tarle
OBJECTIVES: To monitor the real-time changes in light transmittance during composite curing and to use transmittance data to determine the curing times required for a complete polymerization. METHODS: Three conventional and three bulk fill composites were cured with two light-emitting diode curing units at layer thicknesses of 2 mm and 4 mm. The real-time light transmittance data were collected by a UV-Vis spectrometer in the wavelength range of 350-550 nm, plotted against time (t) and fitted to an exponential function f(t), whose first derivative ΔT(t) = df(t)/dt represented the rate of transmittance change...
January 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29279622/evaluation-of-effect-of-different-disposable-infection-control-barriers-on-light-intensity-of-light-curing-unit-and-microhardness-of-composite-an-in-vitro-study
#12
Rajiv Tarachand Khode, Pratima Ramakrishna Shenoi, Rajesh R Kubde, Chetana S Makade, Kanchan D Wadekar, Priyanka Tarachand Khode
Aims: This study evaluated effect of infection control barriers on light intensity (LI) of light-curing unit (LCU) and microhardness of composite. Materials and Methods: Four different disposable barriers (n = 30) were tested against the control. LI for each barrier was measured with Lux meter. One hundred and fifty Teflon molds were equally divided into five groups of thirty each. Composite was filled in bulk in these molds and cured without and with barrier. Microhardness was evaluated on top and bottom surface of composite specimen with microhardness testing machine and hardness ratio (HR) was derived...
May 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29251454/effects-of-cigarette-smoking-on-color-stability-of-dental-resin-composites
#13
Xiaoyi Zhao, Filippo Zanetti, Shoaib Majeed, Jie Pan, Hans Malmstrom, Manuel C Peitsch, Julia Hoeng, Yanfang Ren
PURPOSE: To evaluate the effect of simulated toothbrush abrasion on the surface gloss, the surface roughness and the color stability of incrementally-filled and bulk-fill composites. METHODS: 48 dimensionally standardized composite specimens (n= 8/group) were made from four incrementally-filled composites (Tetric EvoCeram, IPS Empress Direct Enamel, Ceram X mono and Arabesk) and two bulk-fill composites (Quix fil and Tetric EvoCeram Bulk). Before and after toothbrushing simulation the surface gloss was measured by a glossmeter, the surface roughness was evaluated with a profilometer, and the color was measured using a spectrophotometer...
December 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29208783/clinical-time-required-and-internal-adaptation-in-cavities-restored-with-bulk-fill-composites
#14
Marcos Gabriel Vianna-de-Pinho, Guilherme Ferreira Rego, Marina Lermenn Vidal, Roberta Caroline Bruschi Alonso, Luis Felipe Jochims Schneider, Larissa Maria Cavalcante
AIM: The aim of this study was to compare the restorative time required and the internal adaptation after thermomechanical aging of class I restorations using either the conventional incremental technique or bulk-fill technique. MATERIALS AND METHODS: Cavities (Class I) were prepared on the occlusal surface of human third molars. 40 teeth were divided into four experimental groups according to the restorative technique (n = 10): G1 = 3 mm increment of Surefill SDR Flow + 1 mm Filtek P60; G2 = 3 mm increment of Filtek Bulk-Fill + 1 mm Filtek P60; G3 = Filtek P60 inserted with incremental technique; G4 = 3 mm increment of Filtek Z350 Flow XT + 1 mm increment of Filtek P60...
December 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29205770/effect-of-tooth-brushing-on-gloss-retention-and-surface-roughness-of-five-bulk-fill-resin-composites
#15
Catherine O'Neill, Laurent Kreplak, Frederick A Rueggeberg, Daniel Labrie, Carlos Alberto Kenji Shimokawa, Richard Bengt Price
OBJECTIVES: To determine the effects of tooth brushing on five bulk-fill resin based composites (RBCs). METHOD: Ten samples of Filtek Supreme Enamel (control), Filtek One Bulk Fill, Tetric EvoCeram Bulk Fill, SonicFill 2, SDR flow+, and Admira Fusion X-tra were light cured for 20 seconds using the Valo Grand curing light. After 24 hours storage in air at 37°C, specimens were brushed in a random order using Colgate OpticWhite dentifrice and a soft toothbrush. Surface gloss was measured prior to brushing, after 5,000, 10,000 and 15,000 back and forth brushing cycles...
December 5, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29192625/the-force-required-to-fracture-endodontically-roots-restored-with-various-materials-as-intra-orifice-barriers
#16
E Yasa, H Arslan, B Yasa, M Akcay, M Alsancak, H Hatirli
OBJECTIVE: To evaluate the effect of various materials as intra-orifice barriers on the force required fracture roots. MATERIALS AND METHODS: One hundred-thirty five mandibular premolars were decoronated and prepared up to size #40. The root canals were filled and randomly divided into two control and seven experimental groups (n = 15), as follows: Positive control group (the intra-orifice barrier cavity was not prepared), negative control group (the intra-orifice barrier cavity was prepared, but not filled), filling using glass ionomer cement, nano-hybrid composite resin, short fiber-reinforced composite, bulk-fill flowable composite, MTA Angelus, Micro Mega MTA or Biodentine...
October 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29178766/light-energy-transmission-and-vickers-hardness-ratio-of-bulk-fill-resin-based-composites-at-different-thicknesses-cured-by-a-dual-wave-or-a-single-wave-light-curing-unit
#17
Ario Santini, Reem Khalil Naaman, Mohammed Saeed Aldossary
PURPOSE: To quantify light energy transmission through two bulk-fill resin-based composites and to measure the top to bottom surface Vickers hardness ratio (VHratio) of samples of various incremental thicknesses, using either a single-wave or dual-wave light curing unit (LCU). METHODS: Tetric EvoCeram Bulk Fill (TECBF) and SonicFill (SF) were studied. Using MARC-RC, the irradiance delivered to the top surface of the samples 2, 3, 4 and 5 mm thick (n= 5 for each thickness) was adjusted to 800 mW/cm2 for 20 seconds (16 J/cm2) using either a single-wave, Bluephase or a dual-wave, Bluephase G2 LCUs...
April 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29178729/surface-properties-and-color-stability-of-incrementally-filled-and-bulk-fill-composites-after-in-vitro-toothbrushing
#18
Guangyun Lai, Liya Zhao, Jun Wang, Karl-Heinz Kunzelmann
PURPOSE: To evaluate the effect of simulated toothbrush abrasion on the surface gloss, the surface roughness and the color stability of incrementally-filled and bulk-fill composites. METHODS: 48 dimensionally standardized composite specimens (n= 8/group) were made from four incrementally-filled composites (Tetric EvoCeram, IPS Empress Direct Enamel, Ceram X mono and Arabesk) and two bulk-fill composites (Quix fil and Tetric EvoCeram Bulk). Before and after toothbrushing simulation the surface gloss was measured by a glossmeter, the surface roughness was evaluated with a profilometer, and the color was measured using a spectrophotometer...
October 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29178721/the-new-generation-of-conventional-and-bulk-fill-composites-do-not-reduce-the-shrinkage-stress-in-endodontically-treated-molars
#19
Laís Rani Sales Oliveira Schliebe, Stella Sueli Lourenço Braga, Renata Afonso da Silva Pereira, Aline Arêdes Bicalho, Crisnicaw Veríssimo, Veridiana Resende Novais, Antheunis Versluis, Carlos José Soares
PURPOSE: To compare flowable and regular paste bulk-fill resin composites with old and new generation conventional composites that use incremental filling techniques for direct restoration of endodontically-treated teeth. METHODS: Four resin composites produced by the same company (3M-ESPE) were used: two conventional resin composites (old formulation, Z100, and new nanofilled formulation, Filtek Supreme XT); and two bulk-fill resin composites (flowable composite, Filtek Bulk-fill Flowable associated with Filtek Supreme, and regular paste, Filtek Bulk-fill Posterior)...
December 2016: American Journal of Dentistry
https://www.readbyqxmd.com/read/29178709/determination-of-polymerization-shrinkage-of-different-composites-using-a-photoelastic-method
#20
Inga Rullman, Michael Patyna, Bram Janssen, Brita Willershausen
PURPOSE: To investigate the polymerization shrinkage stress of different low viscous bulk composites (SDR, Venus Bulk Fill, X-tra Base, Filtek Bulk Fill) in comparison to a conventional flowable composite (Filtek Supreme XTE Flow) and to high viscous bulk and conventional composites (Filtek Supreme XTE, GrandioSO, Tetric EvoCeram, Tetric EvoCeram BulkFill, Venus Diamond, Venus Pearl), as well as to an experimental composite (Ormocer) and a sonic-activated bulk fill composite (Sonicfill), by means of photoelastic investigation...
February 2017: American Journal of Dentistry
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