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Composite depth of curing

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https://www.readbyqxmd.com/read/27836814/own-brand-label-restorative-materials-a-false-bargain
#1
Gaute Floer Johnsen, Minh Khai Le Thieu, Badra Hussain, Elzbieta Pamuła, Janne Elin Reseland, Ståle Petter Lyngstadaas, Håvard Haugen
OBJECTIVES: This study aims at evaluating and comparing mechanical, chemical, and cytotoxicological parameters of a commercial brand name composite material against two 'own brand label' (OBL) composites. METHODS: Parameters included depth of cure, flexural strength, degree of conversion, polymerization shrinkage, filler particle morphology and elemental analyzes, Vickers hardness, surface roughness parameters after abrasion, monomer elution, and cytotoxicity. RESULTS: The conventional composite outperformed the OBLS in terms of depth of cure (p<0...
November 9, 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27689769/microcomputed-tomography-evaluation-of-polymerization-shrinkage-of-class-i-flowable-resin-composite-restorations
#2
C S Sampaio, K-J Chiu, E Farrokhmanesh, M Janal, R M Puppin-Rontani, M Giannini, E A Bonfante, P G Coelho, R Hirata
The present study aimed to characterize the pattern and volume of polymerization shrinkage of flowable resin composites, including one conventional, two bulk fill, and one self-adhesive. Standardized class I preparations (2.5 mm depth × 4 mm length × 4 mm wide) were performed in 24 caries-free human third molars that were randomly divided in four groups, according to the resin composite and adhesive system used: group 1 = Permaflo + Peak Universal Bond (PP); group 2 = Filtek Bulk Fill + Scotchbond Universal (FS); group 3 = Surefil SDR + XP Bond (SX); and group 4 = Vertise flow self-adhering (VE) (n=6)...
September 30, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27646793/light-transmitting-fiber-optic-posts-an-in%C3%A2-vitro-evaluation
#3
Antigoni Stylianou, John O Burgess, Perng-Ru Liu, Daniel A Givan, Nathaniel C Lawson
STATEMENT OF PROBLEM: The clinical challenge of adhering cement to intracanal dentin is transmitting light to the most apical parts of root canals to allow more efficient polymerization of the cement. PURPOSE: The purpose of this in vitro study was to compare the cement-polymerizing ability, microstructure, and radiopacity of a new fiber optic post (iLumi fiber optic Post) with a clinically successful fiber post (DT Light Post). MATERIAL AND METHODS: Polymerizing ability was compared using a modified depth-of-cure protocol...
September 16, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27609373/-polymerization-of-flowable-composite-core-materials-irradiated-by-super-high-intensity-light-with-short-time
#4
Shao-Wei He, Teng-Yu Geng, Xiang-Feng Meng
PURPOSE: To evaluate the polymerization of dual-cured flowable composite core irradiated by super-high intensity light with short time. METHODS: The light-proof silicon rubber cuboid mold with one end open was syringed and filled by dual-cured flowable resin composite core, then the open end of mold was irradiated directly by a light unit at 1000 mW/cm(2) ×10, ×20 s; or at 3200 mW/cm(2) × 3, ×6 s. The specimens were stored in the light-proof box. After irradiation for 1 h and 24 h, Knoop microhardness was measured along the vertical surfaces of specimens from 1mm to 10 mm depth at 1 mm interval...
June 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/27507991/effect-of-a-desensitizing-varnish-on-microleakage-of-two-self-etch-adhesives
#5
Anna Saffarpour, Aida Saffarpour, Mohammad Javad Kharazifard, Niloofar Golmohamadi
OBJECTIVES: The aim of this in-vitro experimental study was to assess the effect of application of a desensitizing varnish on the enamel and dentin marginal seal. MATERIALS AND METHODS: Seventy-two freshly extracted, intact human premolar teeth were divided into four groups (n=18). Class V cavities (3mm in length, 2mm in width and 2mm in depth) were prepared on the buccal surface of each tooth. The following sealing materials were applied in the four groups: One-step Clearfil S3 Bond (S3) self-etch adhesive, two-step Clearfil SE Bond (SE) self-etch adhesive, S3 Bond+ VivaSens desensitizing varnish (VS+S3) and Clearfil SE Bond + VivaSens (VS+SE)...
November 2015: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27496659/corrigendum-to-physical-properties-and-depth-of-cure-of-a-new-short-fiber-reinforced-composite-dent-mater-29-8-2013-835-841
#6
Sufyan Garoushi, Eija Säilynoja, Pekka K Vallittu, Lippo Lassila
No abstract text is available yet for this article.
September 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27468896/the-effect-of-combining-photoinitiator-systems-on-the-color-and-curing-profile-of-resin-based-composites
#7
Dayane Carvalho Ramos Salles de Oliveira, Mateus Garcia Rocha, Ivo Carlos Correa, Américo Bortolazzo Correr, Jack L Ferracane, Mario Alexandre Coelho Sinhoreti
OBJECTIVE: To evaluate the effect of combining camphorquinone (CQ) and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) on the color and curing profile of resin-based composites. METHODS: Experimental composites were produced with different CQ and TPO molar concentrations: CQ-only, 3CQ:1TPO, 1CQ:1TPO, 1CQ:3TPO, and TPO-only. Polywave LED was characterized using a beam profiler. Block-shaped samples (5mm×5mm×3mm depth) were cured in a custom-designed mold with a polywave LED positioned to compare the regions exposed to the 420-495nm and 380-420nm LED emittances...
October 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27388084/avoiding-a-soggy-bottom-depth-of-cure-of-contemporary-bulk-fill-resin-based-composites
#8
(no author information available yet)
A depth of cure of 4 mm was not achieved in any of the bulk-fill resin composites.
July 8, 2016: British Dental Journal
https://www.readbyqxmd.com/read/27383375/curing-characteristics-of-flowable-and-sculptable-bulk-fill-composites
#9
Vesna Miletic, Pong Pongprueksa, Jan De Munck, Neil R Brooks, Bart Van Meerbeek
OBJECTIVES: The aim of this study was to determine and correlate the degree of conversion (DC) with Vickers hardness (VH) and translucency parameter (TP) with the depth of cure (DoC) of five bulk-fill composites. MATERIALS AND METHODS: Six specimens per group, consisting of Tetric EvoCeram Bulk Fill ("TEC Bulk," Ivoclar Vivadent), SonicFill (Kerr), SDR Smart Dentin Replacement ("SDR," Dentsply), Xenius base ("Xenius," StickTech; commercialized as EverX Posterior, GC), Filtek Bulk Fill flowable ("Filtek Bulk," 3M ESPE), and Tetric EvoCeram ("TEC," control), were prepared for DC and VH: two 2-mm-thick layers, each light-cured for 10 s; one 4-mm bulk-fill, light-cured for 10 or 20 s; and one 6-mm bulk-fill, cured for 20 s...
July 6, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27373167/transmission-of-violet-and-blue-light-through-conventional-layered-and-bulk-cured-resin-based-composites
#10
J E Harlow, F A Rueggeberg, D Labrie, B Sullivan, R B Price
OBJECTIVES: This study measured the transmission of light in the 'violet' (350≤λ≤425nm) and 'blue' (425<λ≤550nm) spectral ranges from a polywave(®) LED curing light through different thicknesses of four commercial, resin-based composites (RBCs). MATERIAL AND METHODS: Samples of conventional layered RBCs (Tetric EvoCeram A2, Filtek Supreme Ultra A2B), and bulk-curing resins (Tetric EvoCeram Bulk Fill IVA, and SureFil SDR Flow U) were prepared. Three samples of each RBC were made at thicknesses of 0...
October 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27345179/effect-of-advancing-the-supply-of-finisher-diet-on-growth-performances-and-carcass-and-pork-quality-of-heavy-barrows-and-gilts
#11
J Suárez-Belloch, M A Sanz, J A Guada, M A Latorre
A total of 120 Duroc×(Large White×Landrace) pigs, 50% barrows and 50% gilts, with 54.1±0.14 kg BW and 103±3 days of age, were used to study the effect of advancing the shift to a standard finisher feed from 100 to 90 and 80 kg BW on production performances and carcass and pork quality. Each of the six treatments (two sexes×three BWs at time of feeding shift) was replicated four times and the experimental unit was the pen (with five pigs for growth performance and carcass variables and three pigs for pork and fat traits)...
June 27, 2016: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/27252008/depth-of-cure-of-contemporary-bulk-fill-resin-based-composites
#12
Adrian U Jin Yap, Mirali Pandya, Wei Seong Toh
This study evaluated the depth of cure (DOC) of packable and flowable bulk-fill resin-based composites (RBCs) including PRG (prereacted glass ionomer) and short-fiber materials. The materials were placed in a black split-mold with a 7 mm deep recess and cured at 700 mW/cm(2) for 20 s using a LED curing light. DOC was assessed using the ISO scraping and Knoops hardness tests. Data (n=5) were computed and analyzed using one-way ANOVA/Scheffe's post hoc test (p<0.05). ISO DOC ranged from 3.66 to 2.54 mm while DOC based on hardness testing ranged from 3 to 1...
2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27251997/mechanical-properties-volumetric-shrinkage-and-depth-of-cure-of-short-fiber-reinforced-resin-composite
#13
Akimasa Tsujimoto, Wayne W Barkmeier, Toshiki Takamizawa, Mark A Latta, Masashi Miyazaki
The mechanical properties, volumetric shrinkage and depth of cure of a short fiber-reinforced resin composite (SFRC) were investigated in this study and compared to both a bulk fill resin composite (BFRC) and conventional glass/ceramic-filled resin composite (CGRC). Fracture toughness, flexural properties, volumetric shrinkage and depth of cure of the SFRC, BFRC and CGRC were measured. SFRC had significantly higher fracture toughness than BFRCs and CGRCs. The flexural properties of SFRC were comparable with BFRCs and CGRCs...
2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27093777/depth-and-distribution-of-the-cure-in-a-resin-based-composite-cured-in-a-simulated-class-ii-cavity
#14
Robert L Erickson, Wayne W Barkmeier
PURPOSE: To examine the effect that a stainless steel (SS) matrix band has on the depth and distribution of cure of a resin-based composite (RBC) in a simulated Class II cavity. METHODS: RBC was cured for 20 seconds in a simulated Class II cavity with and without a SS matrix band, and after 24 hours the specimens were scraped back and ground to expose a vertical central plane where Knoop micro-hardness (KHN) mapping was conducted from 0.05-1.5 mm from the band and in 0...
February 2016: American Journal of Dentistry
https://www.readbyqxmd.com/read/27073101/in-vitro-abrasion-of-resin-coated-highly-viscous-glass-ionomer-cements-a-confocal-laser-scanning-microscopy-study
#15
Özgur Kanik, L Sebnem Turkun, Walter Dasch
OBJECTIVES: The aim of this study was to evaluate the effect of resin coating on the wear depth of highly viscous glass ionomer cements (HVGICs) after 40,000 cycles, corresponding to over 8 years of tooth brushing. MATERIALS AND METHODS: A resin composite (Gradia Direct Posterior), two HVGICs (EQUIA Fil and Riva Self Cure), a resin coating (EQUIA Coat) and a conventional varnish (Fuji Varnish) were used in the study. The control groups were the resin composite group and the non-coated HVGICs groups...
April 13, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27063460/acoustic-properties-of-interfacial-debonding-and-their-relationship-with-shrinkage-stress-in-class-i-restorations
#16
Bo Yang, Jiawen Guo, Qin Huang, Young Heo, Alex Fok, Yan Wang
OBJECTIVES: (1) To investigate the properties, and their correlations, of the acoustic emission (AE) from interfacial debonding of Class-I composite restorations during curing. (2) To establish the relationship between the theoretical shrinkage stress and the level of interfacial debonding in such restorations as determined by AE measurement. METHODS: An AE sensor was attached onto the surface of human molars with a Class-I composite restoration of 4mm (length)×3mm (width)×2mm (depth) to monitor their debonding from the tooth tissues during curing...
June 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27061395/five-second-photoactivation-a-microhardness-and-marginal-adaptation-in-vitro-study-in-composite-resin-restorations
#17
Carlos Alberto Kenji Shimokawa, Paula Mendes Acatauassú Carneiro, Tamile Rocha da Silva Lobo, Victor Elias Arana-Chavez, Michel Nicolau Youssef, Míriam Lacalle Turbino
INTRODUCTION: Studies defining the characteristics of light curing units and photoactivation methods are necessary to allow the correct choices to be made in daily practice. This study aimed to determine whether different photoactivation protocols for composite resins [periodic level shifting (PLS) - 5 second and soft-start] are able to maintain or enhance the mechanical properties and marginal adaptation of restorations. METHODS: Restorations were placed in bovine teeth using the following photoactivation methods: continuous light for 20 seconds (control group); PLS technology (PLS - 5 second group); and continuous light and a light guide tip distance of 6 mm after which the tip was placed at the surface of the restoration (soft-start group)...
October 2016: International Dental Journal
https://www.readbyqxmd.com/read/27024889/determination-and-correlation-of-depth-of-cure-of-a-new-composite-resin-delivery-system
#18
COMPARATIVE STUDY
Barry M Owens, Slaven, Jeffrey G Phebus, James C Ragain
OBJECTIVES: To quantify the depth of cure (DOC) of a composite resin system using two different testing criteria. METHOD AND MATERIALS: The DOC testing employed two different experimental protocol: 1) Forty-eight previously extracted human molars were randomly assigned to four groups of twelve each (n = 12): Group 1 SonicFill composite resin system, shade A1; Group 2 SonicFill, shade A3; Group 3 Herculite Ultra composite resin, shade A1; Group 4 Herculite Ultra, shade A3...
October 2015: Journal of the Tennessee Dental Association
https://www.readbyqxmd.com/read/26976555/conversion-and-temperature-rise-of-remineralizing-composites-reinforced-with-inert-fillers
#19
Matej Par, Ozren Gamulin, Danijela Marovic, Hrvoje Skenderovic, Eva Klaric, Zrinka Tarle
OBJECTIVES: Remineralizing experimental composites based on amorphous calcium phosphate (ACP) were investigated. The impact of curing time (20 and 40s), curing depth (1, 2, 3 and 4mm) and addition of inert fillers (barium glass and silica) on the conversion and temperature rise during curing were examined. METHODS: Five ACP-composites and two control composites were prepared based on the light-curable EBPADMA-TEGDMA-HEMA resin. For temperature measurements, a commercial composite was used as an additional control...
May 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/26943093/properties-of-dual-cure-bulk-fill-composite-resin-restorative-materials
#20
Jon Peter Vandewalker, Jeffery A Casey, Todd A Lincoln, Kraig S Vandewalle
The purpose of this study was to compare the properties of 2 new dual-cure, bulk-fill restorative composite resins to those of a hybrid composite resin material. Depth of cure, fracture toughness, porosity, microleakage, and volumetric shrinkage properties were examined. With the exception of fracture toughness, significant differences were found among materials. Compared to the incrementally placed hybrid composite, the dual-cure, bulk-fill restorative composites in self-cured mode had unlimited depth of cure, similar fracture toughness and porosity formation, and greater polymerization shrinkage and microleakage...
March 2016: General Dentistry
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