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Composite resin fillings

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https://www.readbyqxmd.com/read/27925387/microcomputed-tomography-evaluation-of-volumetric-shrinkage-of-bulk-fill-composites-in-class-ii-cavities
#1
Hamad Algamaiah, Camila S Sampaio, Lindiane C Rigo, Malvin N Janal, Marcelo Giannini, Estevam A Bonfante, Paulo G Coelho, Andre F Reis, Ronaldo Hirata
PURPOSE: This study aimed to quantify polymerization shrinkage of one conventional and three bulk-fill composites, under bonded and unbonded conditions, in Class II preparations using 3D microcomputed tomography (μCT) and report its location. MATERIALS AND METHODS: Preparations (2.5 mm occlusal depth × 4 mm wide × 4 mm mesial box and 1 mm beyond the CEJ distal box depth) were made in 48 human extracted molars (n = 6). Four composites were tested, one regular (Vitalescence/VIT) and three bulk-fill: SureFil SDR Flow (SDR), Tetric EvoCeram Bulk Fill (TET), and Filtek flowable Bulk Fill (FIL)...
December 7, 2016: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/27916635/studies-on-the-effects-of-titanate-and-silane-coupling-agents-on-the-performance-of-poly-methyl-methacrylate-barium-titanate-denture-base-nanocomposites
#2
Nidal W Elshereksi, Mariyam J Ghazali, Andanastuti Muchtar, Che H Azhari
OBJECTIVES: This study aimed to fabricate and characterise silanated and titanated nanobarium titanate (NBT) filled poly(methyl methacrylate) (PMMA) denture base composites and to evaluate the behaviour of a titanate coupling agent (TCA) as an alternative coupling agent to silane. The effect of filler surface modification on fracture toughness was also studied. METHODS: Silanated, titanated and pure NBT at 5% were incorporated in PMMA matrix. Neat PMMA matrix served as a control...
December 1, 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27913333/super-cell-piezoelectric-composite-with-1-3-connectivity
#3
Remi Rouffaud, Franck Levassort, Mai Pham Thi, Claire Bantignies, Marc Lethiecq, Anne-Christine Hladky-Hennion
The standard fabrication method for 1-3 piezocomposites for ultrasound transducers is the "dice and fill" method (DFM) in which lateral periodicity is introduced. This contributes to the appearance of spurious modes that can drastically affect the performance of the device if they appear near its thickness mode frequency, thus limiting the effective frequency range. A new 1-3 piezocomposite fabricated with a super-cell structure [1-3 super cell (13SC)] was designed in order to overcome these limitations. It consists of the merging of several periodic cells with 47% PZT volume fraction and epoxy resin as the matrix...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27892839/influence-of-adhesive-type-and-placement-technique-on-postoperative-sensitivity-in-posterior-composite-restorations
#4
Trf Costa, M Rezende, A Sakamoto, B Bittencourt, P Dalzochio, A D Loguercio, A Reis
PURPOSE: This double blind, randomized clinical trial compared the postoperative sensitivity of the placement technique (incremental and bulk fill) in posterior composite resin restorations bonded with two different adhesive strategies (self-etch and etch-and-rinse). METHODS: Posterior dental cavities of 72 participants (n=236), with a cavity depth of at least 3 mm, were randomly divided into four groups. The restorations were bonded using either the etch-and-rinse Tetric N-Bond (Ivoclar Vivadent) or the self-etch Tetric N-Bond SE (Ivoclar Vivadent)...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27892836/comparison-of-internal-adaptation-in-class-ii-bulk-fill-composite-restorations-using-micro-ct
#5
S H Han, S H Park
PURPOSE: This study compared the internal adaptation of bulk-fill composite restorations in class II cavities and explored the relationship between internal adaptation and polymerization shrinkage or stress. METHODS AND MATERIALS: Standardized mesio-occluso-distal cavities were prepared in 40 extracted human third molars and randomly divided into five groups (n=8). After having been applied by total-etch XP bond (Dentsply Caulk, Milford, DE, USA) and light curing, the teeth were restored with the following resin composites: group 1, Filtek Z350 (3M ESPE, St...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27890355/the-effects-of-cavity-margin-angles-and-bolus-stiffness-on-the-mechanical-behavior-of-indirect-resin-composite-class-ii-restorations
#6
Pietro Ausiello, Stefano Ciaramella, Franklin Garcia-Godoy, Antonio Gloria, Antonio Lanzotti, Saverio Maietta, Massimo Martorelli
OBJECTIVE: To study the influence of the different class II mesio-occlusal-distal (MOD) cavity shape on the stress and strain distributions in adhesive indirect restorations, using numerical finite element analysis (FEA). To investigate the relationship between restored teeth failure and stiffness of food, three values of Young's modulus were used for the food. METHODS: A 3D model of a sound lower molar and three class II MOD cavities with different shape were created...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27889605/posterior-composites-update-on-cavities-and-filling-techniques
#7
J Sabbagh, R J McConnell, M Clancy McConnell
OBJECTIVES: The aim of this paper is to examine cavity design for posterior resin composite restorations and to discuss various resin composite filling techniques. DATA: Literature with regard to cavity preparation for amalgam and resin composite restorations has been reviewed. An overview of available bulkfill resin composite systems is provided and a categorization of these systems according to their clinical application and their intended use is outlined. SOURCES: A literature search was carried out by the authors in Medline...
November 23, 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27886272/can-long-term-dentine-bonding-created-in-real-life-be-forecasted-by-parameters-established-in-the-laboratory
#8
Heleine M C Rêgo, Thaís S Alves, Eduardo Bresciani, Li-Na Niu, Franklin R Tay, César R Pucci
Tooth-coloured plastic dental fillings secured by adhesives to tooth structures are widely used to fix decayed teeth. Whereas laboratory tests demonstrate rapid deterioration of the ability of the adhesives to stick to dentine, clinical studies show that these fillings are relatively durable. This discrepancy suggests that the parameters used for simulating bond degradation in the laboratory setting do not correlate well with clinical outcomes. The present study examined the long-term tensile bond strength of resin composite fillings performed in real life and under different laboratory-simulated bonding conditions to identify parameters that may be used to forecast the durability of adhesive bonds created in dentine...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27843942/color-matching-and-blending-effect-of-universal-shade-bulk-fill-resin-composite-in-resin-composite-models-and-natural-teeth
#9
Rasha M Abdelraouf, Nour A Habib
Objectives. To assess visually color-matching and blending-effect (BE) of a universal shade bulk-fill-resin-composite placed in resin-composite-models with different shades and cavity sizes and in natural teeth (extracted and patients' teeth). Materials and Methods. Resin-composite-discs (10 mm × 1 mm) were prepared of universal shade composite and resin-composite of shades: A1, A2, A3, A3.5, and A4. Spectrophotometric-color-measurement was performed to calculate color-difference (ΔE) between the universal shade and shaded-resin-composites discs and determine their translucency-parameter (TP)...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27836116/effect-of-layer-thickness-on-the-elution-of-bulk-fill-composite-components
#10
Lena Rothmund, Franz-Xaver Reichl, Reinhard Hickel, Panorea Styllou, Marianthi Styllou, Kai Kehe, Yang Yang, Christof Högg
OBJECTIVE: An increment layering technique in a thickness of 2mm or less has been the standard to sufficiently convert (co)monomers. Bulk fill resin composites were developed to accelerate the restoration process by enabling up to 4mm thick increments to be cured in a single step. The aim of the present study is to investigate the effect of layer thickness on the elution of components from bulk fill composites. METHODS: The composites ELS Bulk fill, SDR Bulk fill and Venus Bulkfill were polymerized according to the instruction of the manufacturers...
November 8, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27778135/effect-of-adhesive-system-application-for-cavities-prepared-with-erbium-chromium-yttrium-scandium-gallium-garnet-laser-on-rat-dental-pulp-tissue
#11
Mayo Takada, Masaya Suzuki, Maiko Haga-Tsujimura, Koichi Shinkai
We examined the effects of adhesive systems under study applied for a laser-cut cavity using an Er,Cr:YSGG laser on rat dental pulp at 24 h and 14 days postoperatively. Group 1, laser-cut cavities were treated with a self-etching-primer and bonding agent; group 2, pretreated with a phosphoric-acid, and then treated with a self-etching-primer and bonding agent; group 3, pretreated with a phosphoric-acid and sodium-hypochlorite, and then treated with a self-etching-primer and bonding agent; and group 4, treated with an all-in-one adhesive...
October 24, 2016: Odontology
https://www.readbyqxmd.com/read/27773762/sol-gel-methods-for-synthesis-of-aluminosilicates-for-dental-applications
#12
Alexandre Cestari
INTRODUCTION: Amorphous aluminosilicates glasses containing fluorine, phosphorus and calcium are used as a component of the glass ionomer dental cement. This cement is used as a restorative, basis or filling material, but presents lower mechanical resistance than resin-modified materials. The Sol-Gel method is a possible route for preparation of glasses with lower temperature and energy consumption, with higher homogeneity and with uniform and nanometric particles, compared to the industrial methods Glass ionomer cements with uniform, homogeneous and nanometric particles can present higher mechanical resistance than commercial ionomers...
October 20, 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27757445/systematic-review-on-highly-viscous-glass-ionomer-cement-resin-coating-restorations-part-i-%C3%A2-do-they-merge-minamata-convention-and-minimum-intervention-dentistry
#13
Andrej M Kielbassa, Georg Glockner, Michael Wolgin, Karl Glockner
BACKGROUND: With the Minamata Convention the use of mercury will be phased down, and this undoubtedly will have an effect on dental treatment regimens and economic resources. Composite resin restorations are considered viable alternatives to amalgam fillings; however, these will not be covered completely by health insurance systems in many countries. Recently, a high-viscosity glass-ionomer cement (hvGIC) processed with a resinous coating (RC) has been introduced, and has been marketed as a restorative material in load-bearing Class I cavities (and in Class II cavities with limited size), thus serving as a possible alternative to amalgam fillings...
2016: Quintessence International
https://www.readbyqxmd.com/read/27746595/evaluation-of-the-flexural-strength-and-microhardness-of-provisional-crown-and-bridge-materials-fabricated-by-different-methods
#14
Shruti Digholkar, V N V Madhav, Jayant Palaskar
PURPOSE: The purpose of this study was to evaluate and compare the flexural strength and microhardness of provisional restorative materials fabricated utilizing rapid prototyping (RP), Computer Assisted Designing and Computer Assisted Milling (CAD-CAM) and conventional method. MATERIALS AND METHODS: Twenty specimens of dimensions 25 mm × 2 mm × 2 mm (ADA-ANSI specification #27) were fabricated each using: (1) Three dimensional (3D) printed light-cured micro-hybrid filled composite by RP resin group, (2) a milled polymethyl methacrylate (CH) using CAD-CAM (CC resin group), and (3) a conventionally fabricated heat activated polymerized CH resin group...
October 2016: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/27726385/reactive-diazonium-modified-silica-fillers-for-high-performance-polymers
#15
Mariusz Piotr Sandomierski, Beata Strzemiecka, Mohamed Mehdi Chehimi, Adam Voelkel
We describe a simple way of modification of three silica-based fillers with in situ generated 4-hydroxymethylbenzenediazonium salt (+N2-C6H4-CH2OH). The rationale for using a hydroxyl-functionalized diazonium salt is that it provides surface-functionalized fillers that can react with phenolic resins. The modification of silica by diazonium salts was assessed by FTIR and XPS. FTIR permitted to track benzene ring breathing and C-C. The absence of the characteristic N≡N stretching vibration at 2200-2300 cm-1 range indicates the loss of the diazonium group...
October 11, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27725368/effects-of-c-factor-on-bond-strength-to-floor-and-wall-dentin
#16
Takako Yoshikawa, Alireza Sadr, Junji Tagami
This study evaluated the effect of C-factor on the bond strength of a resin composite to floor and wall dentin using two adhesive systems. Box-form cavities were prepared on human molars, following the walls of half of the cavities were removed to create flat dentin surfaces for bonding. Each specimen was then restored using one of two adhesives (Clearfil SE Bond or Clearfil tri-S Bond) and filled or built up using Z100 resin composite. After light-curing, the specimen was cut perpendicular to the bonded surface parallel to the floor or wall to obtain beams...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27723424/clinical-photographic-scanning-electron-microscopy-analysis-of-pit-and-fissure-sealants-after-22-years-a-case-series
#17
D Sundfeld, L S Machado, L M Franco, F M Salomão, Nip Pini, Mlmm Sundefeld, C S Pfeifer, R H Sundfeld
Pit and fissure sealant is a clinical technique adopted to prevent caries lesion development. Ionomeric and/or resin-based materials are commonly used for this purpose. This article presents a case series of sealed teeth with 22-year follow-up evaluated by clinical, photographic, and microscopic analysis. In 1992, sixteen patients (9-14 years of age) had at least three teeth sealed with one of the following materials: resin-modified glass ionomer cement (RMGIC, Vitrebond or Fuji II LC) or polyacid-modified resin composite (PMRC, VariGlass VLC), totaling 86 sealed permanent teeth...
October 10, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27720423/filler-characteristics-of-modern-dental-resin-composites-and-their-influence-on-physico-mechanical-properties
#18
Luc D Randolph, William M Palin, Gaëtane Leloup, Julian G Leprince
OBJECTIVE: The mechanical properties of dental resin-based composites (RBCs) are highly dependent on filler characteristics (size, content, geometry, composition). Most current commercial materials are marketed as "nanohybrids" (i.e. filler size <1μm). In the present study, filler characteristics of a selection of RBCs were described, aiming at identifying correlations with physico-mechanical properties and testing the relevance of the current classification. METHODS: Micron/sub-micron particles (> or <500nm) were isolated from 17 commercial RBCs and analyzed by laser diffractrometry and/or electron microscopy...
December 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27713454/posterior-bulk-filled-resin-composite-restorations-a-5-year-randomized-controlled-clinical-study
#19
(no author information available yet)
No better clinical outcome for bulk-filled resin composites.
October 7, 2016: British Dental Journal
https://www.readbyqxmd.com/read/27689769/microcomputed-tomography-evaluation-of-polymerization-shrinkage-of-class-i-flowable-resin-composite-restorations
#20
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
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