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Composite depth of curing

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https://www.readbyqxmd.com/read/28917571/academy-of-dental-materials-guidance-resin-composites-part-ii-technique-sensitivity-handling-polymerization-dimensional-changes
#1
J L Ferracane, T J Hilton, J W Stansbury, D C Watts, N Silikas, N Ilie, S Heintze, M Cadenaro, R Hickel
OBJECTIVE: The objective of this work, commissioned by the Academy of Dental Materials, was to review and critically appraise test methods to characterize properties related to critical issues for dental resin composites, including technique sensitivity and handling, polymerization, and dimensional stability, in order to provide specific guidance to investigators planning studies of these properties. METHODS: The properties that relate to each of the main clinical issues identified were ranked in terms of their priority for testing, and the specific test methods within each property were ranked...
September 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28917087/evaluation-of-four-different-restorative-materials-for-restoration-of-the-periodontal-condition-of-wedge-shaped-defect-a-comparative-study
#2
Jian-Yong Ruan, Zheng-Lin Gong, Rui-Zhi Zhang, Zhe Zhang, Ran Xu, Da-Xu Li, Le Ren, Hong Tao
BACKGROUND This study aimed to conduct a clinical evaluation of four restorative materials for restoration of dental wedge-shaped defect (WSD) and their impacts on periodontal tissues. MATERIAL AND METHODS A total of 280 maxillary premolars with dental WSD were selected from 106 patients; the patient cases were divided into eight groups according to different combinations of restorative materials (flowable resin composites, Dyract compomers, glass ionomer cement (GIC), light-curing composite resin), and WSD positions (approaching gingival and subgingival positions)...
September 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28902239/efficiency-of-polymerization-of-bulk-fill-composite-resins-a-systematic-review
#3
André Figueiredo Reis, Mariana Vestphal, Roberto Cesar do Amaral, José Augusto Rodrigues, Jean-François Roulet, Marina Guimarães Roscoe
This systematic review assessed the literature to evaluate the efficiency of polymerization of bulk-fill composite resins at 4 mm restoration depth. PubMed, Cochrane, Scopus and Web of Science databases were searched with no restrictions on year, publication status, or article's language. Selection criteria included studies that evaluated bulk-fill composite resin when inserted in a minimum thickness of 4 mm, followed by curing according to the manufacturers' instructions; presented sound statistical data; and comparison with a control group and/or a reference measurement of quality of polymerization...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28832713/comparing-depth-dependent-curing-radiant-exposure-and-time-of-curing-of-regular-and-flow-bulk-fill-composites
#4
Jose Augusto Rodrigues, Ilana Pais Tenorio, Ginger Baranhuk Rabello de Mello, André Figueiredo Reis, Chiayi Shen, Jean-François Roulet
The effect of restoration depth on the curing time of a conventional and two bulk-fill composite resins by measuring microhardness and the respective radiosity of the bottom surface of the specimen was investigated. 1-, 3- and 5-mm thick washers were filled with Surefil SDR Flow-U (SDR), Tetric EvoCeram Bulk Fill-IVA (TEC) or Esthet-X HD-B1 (EHD), and cured with Bluephase® G2 for 40s. Additional 1-mm washers were filled with SDR, TEC or EHD, placed above the light sensor of MARC®, stacked with pre-cured 1-, 3- or 5-mm washer of respective material, and cured for 2...
August 21, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28807329/impact-of-thio-urethane-additive-and-filler-type-on-light-transmission-and-depth-of-polymerization-of-dental-composites
#5
André Luis Faria-E-Silva, Carmem Silvia Pfeifer
OBJECTIVE: This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. METHODS: BisGMA:UDMA:TEGMA (5:3:2wt%) were mixed with 0 (control) or 20wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization...
August 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28760330/thermographic-analysis-of-the-effect-of-composite-type-layering-method-and-curing-light-on-the-temperature-rise-of-photo-cured-composites-in-tooth-cavities
#6
Min-Jung Kim, Ryan Jin-Young Kim, Jack Ferracane, In-Bog Lee
OBJECTIVES: The purpose of this study was to investigate temperature rise in the composite and dentin of a class I cavity in extracted human molars under different restoration conditions, including the use of different composite types, layering methods, and curing lights. METHODS: Open occlusal cavities were prepared on 28 extracted human molars. A conventional (Filtek Z250) and a bulk-fill (Filtek Bulk Fill Posterior; BFP) composite were used to restore the preparations...
July 28, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28652817/effect-of-preheating-and-light-curing-unit-on-physicochemical-properties-of-a-bulk-fill-composite
#7
Jéssica Dias Theobaldo, Flávio Henrique Baggio Aguiar, Núbia Inocencya Pavesi Pini, Débora Alves Nunes Leite Lima, Priscila Christiane Suzy Liporoni, Anderson Catelan
OBJECTIVE: The aim of this study is to evaluate the effect of composite preheating and polymerization mode on degree of conversion (DC), microhardness (KHN), plasticization (P), and depth of polymerization (DP) of a bulk fill composite. METHODS: Forty disc-shaped samples (n = 5) of a bulk fill composite were prepared (5 × 4 mm thick) and randomly divided into 4 groups according to light-curing unit (quartz-tungsten-halogen [QTH] or light-emitting diode [LED]) and preheating temperature (23 or 54 °C)...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/28652556/characteristics-of-low-polymerization-shrinkage-flowable-resin-composites-in-newly-developed-cavity-base-materials-for-bulk-filling-technique
#8
Keiko Nitta, Rie Nomoto, Yuji Tsubota, Masuji Tsuchikawa, Tohru Hayakawa
The purpose of this study was to evaluate polymerization shrinkage and other physical properties of newly-developed cavity base materials for bulk filling technique, with the brand name BULK BASE (BBS). Polymerization shrinkage was measured according to ISO/FDIS 17304. BBS showed the significantly lowest polymerization shrinkage and significantly higher depth of cure than conventional flowable resin composites (p<0.05). The Knoop hardness, flexural strength and elastic modulus of that were significantly lower than conventional flowable resin composites (p<0...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28629032/effects-of-silane-modified-fillers-on-properties-of-dental-composite-resin
#9
Aysu Aydınoğlu, Afife Binnaz Hazar Yoruç
The effect of silanization on the mechanical, chemical, and physical properties of dental composites was investigated. Silica fillers were obtained from colloidal silica solution, Ludox® HS-40 and they were silanized by using 3-methacryloxypropyl trimethoxysilane (MPTMS) in an acidic media. Mineralogical and chemical structures of unsilanized and silanized fillers were determined by using XRD and FT-IR analyses. The modification of unsilanized/silanized fillers were investigated by performing XPS and TGA analyses...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628735/effect-of-shade-opacity-and-layer-thickness-on-light-transmission-through-a-nano-hybrid-dental-composite-during-curing
#10
Hong-Keun Hyun, Carly K Christoferson, Carmem S Pfeifer, Chris Felix, Jack L Ferracane
OBJECTIVE: The aim of this study was to investigate the effect of shade and opacity on the change in light transmission through different thicknesses of a nano-hybrid composite during curing. MATERIALS AND METHODS: Twelve different shades of Venus Diamond (Heraeus Kulzer) were placed in disk shaped molds with thickness of 1, 2, and 3 mm (n = 3 per group) and cured with an LED light-curing unit. Initial, final and average irradiance, and the total amount of energy passing through the specimen were measured using the MARC Resin Calibrator at every 10s for a total of 40s...
June 19, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28605610/effect-of-light-curing-exposure-time-shade-and-thickness-on-the-depth-of-cure-of-bulk-fill-composites
#11
A Rodriguez, P Yaman, J Dennison, D Garcia
PURPOSE: To investigate the effect of different light exposure times, shades, and thicknesses on the depth of cure (DOC) of bulk fill composites. METHODS AND MATERIALS: Two bulk fill composites, Tetric EvoCeram Bulk Fill (TBF) and Sonic Fill (SF), and a conventional composite, Filtek Supreme Ultra (FSU), were evaluated. Samples (n=10) were made using two different shades (light and dark), thicknesses (2 and 4 mm) and exposure times (20 and 40 seconds). A Tukon 2100B-testing machine was used to obtain three Knoop hardness numbers (KHNs) measured at the top and bottom of each sample, and DOC was calculated as the bottom/top ratio...
September 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28583237/intrapulpal-temperature-rise-during-light-activation-of-restorative-composites-in-a-primary-molar
#12
Craig V Vinall, Tales C Garcia-Silva, Jennifer S B Lou, Martha H Wells, Daranee Tantbirojn, Antheunis Versluis
PURPOSE: To investigate intrapulpal temperature rise in a primary molar during light activation of a composite restoration to determine if clinically significant pulpal temperatures (greater than 5.5 degrees Celsius) were reached. METHODS: Restorative composites (EsthetX HD, Filtek Supreme Ultra, Filtek Bulk Fill) were placed into a primary molar with occlusal preparation (1.5 mm depth; remaining pulpal floor thickness one mm). The pulp was extirpated through a root access to place a thermocouple against the pulpal roof...
May 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28580462/does-tack-curing-luting-cements-affect-the-final-cure
#13
Daniel Stegall, Daranee Tantbirojn, Jorge Perdigão, Antheunis Versluis
PURPOSE: Short initial light curing or "tack curing" is used to create a semi-gel state in luting cements for easier excess material cleanup. The effect of tack curing on the final cure of luting cements was measured in terms of hardness. MATERIALS AND METHODS: Three cement types were tested: two dual-curing composite cements (RelyX Unicem 2; Maxcem Elite); three light-curing veneer cements (Choice 2; Variolink Esthetic LC; RelyX Veneer); and two self-curing resin-modified glass-ionomer (RMGI) luting cements (RelyX Luting Plus; Nexus RMGI)...
June 2, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28576660/impact-of-light-transmittance-mode-on-polymerisation-kinetics-in-bulk-fill-resin-based-composites
#14
Nicoleta Ilie
OBJECTIVES: to determine the mode of light transmission and its impact on the polymerisation kinetic in modern bulk-fill resin-based composites (B-RBC). MATERIALS AND METHODS: Four low-viscosity methacrylate-based and one high-viscosity ormocer-based B-RBCs were considered. One material was available in three different shades that were all analyzed. Polymerization kinetic and light transmittance were assessed in 2 and 4mm specimen depths. Incident and transmitted irradiance and radiant exposure were measured in real-time on a laboratory-grade spectrometer...
May 30, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28522161/effect-of-blue-and-violet-light-on-polymerization-shrinkage-vectors-of-a-cq-tpo-containing-composite
#15
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)...
July 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28521113/real-time-imaging-of-gap-progress-during-and-after-composite-polymerization
#16
J Hayashi, Y Shimada, J Tagami, Y Sumi, A Sadr
The aims of this study were to observe the behavior of composite and formation of gaps during and immediately after light polymerization using swept source optical coherence tomography (OCT) and to compare the interfacial integrity of adhesives in cavities through 3-dimensional (3D) image analysis. Forty tapered cylindrical cavities (4-mm diameter, 2-mm depth) were prepared in bovine incisors and restored using Bond Force (BF), Scotchbond Universal Adhesive (SBU), OptiBond XTR (XTR), or Clearfil SE Bond 2 (SE2), followed by Estelite Flow Quick flowable composite...
August 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28443833/bulk-fill-composites-a-review-of-the-current-literature
#17
Annelies Van Ende, Jan De Munck, Diogo Pedrollo Lise, Bart Van Meerbeek
PURPOSE: The aim of this article was to provide an overview of the literature on the currently available bulk-fill composites, and to describe the common trends as well as the wide variations. The findings may help the clinician to select the proper material with regard to its applicability in various clinical situations. METHODS: The literature up to October 2016 was reviewed based on a PubMed search (keywords: "bulk-fill OR bulkfill OR bulk fill" AND "composite OR composites")...
2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28435361/effects-of-delivering-the-same-radiant-exposures-at-730-1450-and-2920-mw-cm-2-to-two-resin-based-composites
#18
Maan M AlShaafi
OBJECTIVE: To evaluate the effects of curing two resin-based composites (RBC) with the same radiant exposures at 730, 1450, and 2920 mW/cm(2). MATERIALS AND METHODS: Two types of RBC, Filtek Supreme Ultra and Tetric-EvoCeram-Bulk Fill, were light-cured to deliver the same radiant exposures for 5, 10, or 20 s by means of a modified Valo light emitted diode light-curing unit with the light tip placed directly over each specimen. The RBC was expressed into metal rings that were 2...
January 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28402730/light-emitting-diode-beam-profile-and-spectral-output-influence-on-the-degree-of-conversion-of-bulk-fill-composites
#19
M G Rocha, Dcrs de Oliveira, I C Correa, L Correr-Sobrinho, Mac Sinhoreti, J L Ferracane, A B Correr
OBJECTIVES: To evaluate the beam profile and the spectral output of monowave and polywave light-emitting diodes (LEDs) and their influence on the degree of conversion (DC) of bulk fill composites. METHODS: A monowave LED (Smartlite Focus, Dentsply) and a polywave LED (Valo Cordless, Ultradent) were characterized using a resin calibrator and a laser beam profile analyzer. Two bulk fill composites, Sonic Fill 2 (SF) containing camphorquinone (CQ) and Tetric EvoCeram Bulk Fill (TEB) containing CQ associated with alternative photoinitiators, were placed in custom-designed molds (n=3) and photoactivated by the monowave or polywave LED with 20 J/cm(2)...
July 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28397453/the-effect-of-curing-light-intensity-on-free-volume-size-in-some-dental-composites
#20
Mahdieh Shirazinia, Ali Akbar Mehmandoost-Khajeh-Dad, Vahid Dehghani, Jamshid Mehmandoost-Khajeh-Dad, Morteza Khaghani
BACKGROUND: Dental composite resins - reinforced polymers - are types of synthetic resins that are used in dentistry as restorative material or adhesives. The effect of curing-light intensity on free volume sizes of 4 commercial dental composites has been studied by means of the well-known positron annihilation lifetime spectroscopy technique. OBJECTIVES: The aim of the study was to compare the photosensitivity of 4 commercial dimethacrylate-based dental composites...
July 2016: Polimery W Medycynie
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