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Resin composite

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https://www.readbyqxmd.com/read/28732183/new-resins-for-dental-composites
#1
A P P Fugolin, C S Pfeifer
Restorative composites have evolved significantly since they were first introduced in the early 1960s, with most of the development concentrating on the filler technology. This has led to improved mechanical properties, notably wear resistance, and has expanded the use of composites to larger posterior restorations. On the organic matrix side, concerns over the polymerization stress and the potential damage to the bonded interface have dominated research in the past 20 y, with many "low-shrinkage" composites being launched commercially...
July 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28729794/assessment-of-resin-dentin-interfacial-morphology-of-two-ethanol-based-universal-adhesives-a-scanning-electron-microscopy-study
#2
Mohamed Moustafa Awad
OBJECTIVE: The objective of this study was to assess the resin-dentin interfacial morphology created by two universal adhesives using scanning electron microscopy (SEM). MATERIALS AND METHODS: The occlusal surfaces of ten (n = 5) molars were reduced to expose a flat surface of dentin. Two universal adhesives, Scotchbond Universal Adhesive and Tetric N-Bond Universal, were independently applied to air-dried dentin. Light-cured resin-based composite restorative materials were used to incrementally build a composite "buildup...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28729788/a-comparative-in-vitro-study-on-fluoride-release-and-water-sorption-of-different-flowable-esthetic-restorative-materials
#3
Asmaa Youssif Harhash, Iman Ibrahim ElSayad, Ahmad G S Zaghloul
OBJECTIVES: The objective of the study was to evaluate fluoride release and water sorption of three flowable esthetic restorative materials: a giomer, a fluoride-releasing resin composite, and a nonfluoridated resin composite. MATERIALS AND METHODS: Ten samples from a giomer, a fluoride releasing nano-hybrid, and a nonfluoridated nano-hybrid composite were prepared and immersed in deionized water. Fluoride measurements were done using an ion-specific electrode attached to a microprocessor-based fluoride meter after 1 day, 1 week, and 4 weeks...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28729526/high-performance-surface-modified-tio2-silicone-nanocomposite
#4
Pei Huang, Han-Qiao Shi, Hong-Mei Xiao, Yuan-Qing Li, Ning Hu, Shao-Yun Fu
The mismatch of refractive index (RI) between light emitting diode (LED) chips and packaging resins severely lowers the lighting emitting efficacy of LED. The RI can be enhanced by the introduction of high RI nanoparticles but meanwhile it is a great challenge to maintain the high transparency for resins due to the agglomeration of nanoparticles. In this work, a facile strategy is proposed to fabricate silicone nanocomposites with a high transparency (>88%, less than 2% decrease relative to pure silicone resin), largely enhanced RI (an increase from 1...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729119/effect-of-restorations-using-a-flowable-resin-composite-in-non-carious-cervical-lesions-a-systematic-review-and-meta-analysis
#5
REVIEW
Anna Szesz, Sibelli Parreiras, Eveline Martini, Alessandra Reis, Alessandro Loguercio
OBJECTIVES: To answer the following PICO question (participant, intervention, comparator and outcome): Does flowable resin composite restorations compared with regular resin composites improve the marginal adaptation, marginal discoloration and retention rates of restorations placed in non-carious cervical lesions [NCCLs] of adults?, through a systematic review and meta-analysis. SOURCE: MEDLINE, Scopus, Web of Science, LILACS, BBO, Cochrane Library and SIGLE were searched without restrictions, as well as the abstracts of the IADR, clinical trials registries, dissertations and theses in May 2016 (updated in April 2017)...
July 17, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28727468/effect-of-finishing-procedures-on-the-surface-roughness-of-resin-modified-glass-ionomer-materials
#6
Mohammad Garshasb, Gildo C Santos, Amin S Rizkalla, Richard Bohay, M Jacinta Santos
This study examined the influence of finishing procedures on the surface roughness of different formulations of resin-modified glass ionomers (RMGIs) available in capsules compared with standard resin composites (RCs). Disc samples of three RMGIs and two RCs were fabricated using a metal mold (5 mm x 1.5 mm). Samples were randomly divided into seven groups (N = 10) and subjected to finishing and polishing procedures using a combination of carbide or diamond burs, followed by either rubber points or aluminum-oxide discs...
July 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28727251/degree-of-conversion-and-cross-link-density-within-a-resin-matrix-composite
#7
Afnan O Al-Zain, George J Eckert, Henry Lukic, Spiro J Megremis, Jeffrey A Platt
The aims of this study were to profile light radiated from two light-curing units (LCUs) and evaluate profile relationship to polymerization patterns within a resin-matrix composite (RMC). Beam profiles of one multiple emission peak light-emitting-diode and one quartz-tungsten-halogen curing-unit were measured using a beam profiler/spectrometer system. A camera-based profiler and an integrating sphere/spectrometer assembly were used to evaluate each LCU beam. Polymerization patterns within a nano-hybrid RMC were investigated using a mapping approach by assessing the degree of conversion utilizing micro-Raman spectroscopy and indirectly estimating cross-link-density by repeated microhardness testing before and after exposure to ethanol (%KH reduction, n = 3)...
July 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28727013/changes-in-the-rumen-bacterial-microbiome-of-cattle-exposed-to-ponderosa-pine-needles
#8
K D Welch, C A Stonecipher, D R Gardner, D Cook, J A Pfister
Consumption of ponderosa pine needles, as well as needles and bark from a number of other trees, can cause abortions in cattle. The abortifacient compounds in these trees are labdane resin acids, including isocupressic acid and agathic acid. Previous research has demonstrated that cattle conditioned to pine needles metabolize the labdane resin acids more quickly than naïve cattle. The results from that study indicated that changes had occurred in the rumen of conditioned cattle. Therefore, in this study, the changes that occurred in the rumen bacterial microflora of cattle during exposure to ponderosa pine needles were evaluated...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28725152/analysis-of-inorganic-and-organic-constituents-of-myrrh-resin-by-gc-ms-and-icp-ms-an-emphasis-on-medicinal-assets
#9
Syed Rizwan Ahamad, Abdul Rahman Al-Ghadeer, Raisuddin Ali, Wajhul Qamar, Suliman Aljarboa
The aim of the present investigation was to explore the constituents of the Arabian myrrh resin obtained from Commiphora myrrha. The organic and inorganic composition of the myrrh gum resin has been investigated using gas chromatography-mass spectrometry (GC-MS) and inductively coupled plasma-mass spectrometry (ICP-MS). Analysis executed by ICP-MS reveals the presence of various inorganic elements in significant amount in the myrrh resin. The elements that were found to be present in large amounts include calcium, magnesium, aluminum, phosphorus, chlorine, chromium, bromine and scandium...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28723609/failure-analysis-of-eleven-gates-glidden-drills-that-fractured-intraorally-during-post-space-preparation-a-retrieval-analysis-study
#10
Youssef S Al Jabbari, Raymond Fournelle, Sara M Al Taweel, Spiros Zinelis
The purpose of this study was to determine the failure mechanism of clinically failed Gates Glidden (GG) drills. Eleven retrieved GG drills (sizes #1 to #3) which fractured during root canal preparation were collected and the fracture location was recorded based on macroscopic observation. All fracture surfaces were investigated by a SEM. Then the fractured parts were embedded in acrylic resin and after metallographic preparation, the microstructure and elemental composition was evaluated by SEM and EDS. The Vickers hardness (HV) of all specimens was also determined...
July 19, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28721100/shear-bond-strength-of-different-surface-treatments-in-bulk-fill-microhybrid-and-nanoparticle-repair-resins
#11
Rudys Rodolfo de Jesus Tavarez, Lauber Jose Dos Santos Almeida Júnior, Tayanne Christine Gomes Guará, Izabella Santos Ribeiro, Etevaldo Matos Maia Filho, Leily Macedo Firoozmand
OBJECTIVES: The purpose of this study was to evaluate the influence of surface treatment and different types of composite resin on the microshear bond strength of repairs. MATERIALS AND METHODS: Seventy-two specimens (n=72) were prepared using a nanoparticle resin and stored in artificial saliva at 37 ± 1°C for 24 h. After this period, the specimens (n=24) were restored with microhybrid resin P60 (3M ESPE), nanoparticle resin Filtek Z350 (3M ESPE), and Bulk Fill Surefil SDR Flow (Dentsply) composite resins...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/28717792/accelerated-fatigue-resistance-%C3%A2-of-novel-design-histoanatomic-%C3%A2-implant-restorations-made-of-%C3%A2-cad-cam-bilaminar-assemblies
#12
Ivan Molina, Jack Goldberg, Claudia Maziero Volpato, Pascal Magne
OBJECTIVES: Evaluate the fatigue resistance and failure mode of novel-design implant restorations made of histoanatomic computer-assisted design/computer-assisted manufacturing (CAD/CAM) bilaminar bonded assemblies. MATERIAL AND METHODS: 60 screw-retained implant restorations were fabricated. Monolithic restorations were used as a control group (15 lithium disilicate: group CE; and 15 nanofilled composite resin: group CL), and compared with bilaminar restorations (15 dentin-shaped lithium disilicate mesostructures with a bonded nanofilled composite resin veneer: group CEL; and 15 dentin-shaped nanofilled composite resin mesostructures with a bonded lithium disilicate veneer: group CLE)...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28717632/effect-of-different-intracoronal-bleaching-methods-on-shear-bond-strength-of-ceramic-brackets-bonded-to-bleached-enamel-an-in-vitro-study
#13
Vikas Chauhan, Piush Kumar, Payal Sharma, Divya Shetty
OBJECTIVE: To investigate the effect of different intracoronal bleaching methods on the shear bond strength and site of failure of ceramic brackets. MATERIALS AND METHODS: Sixty freshly extracted human maxillary incisors were randomly divided into four groups (n = 15). Endodontic access cavity was prepared and root canals were filled, root fillings were removed 2mm apical to the cementoenamel junction, and a 2-mmthick layer of glass ionomer cement base was applied...
July 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28717165/fabricating-fast-triggered-electro-active-shape-memory-graphite-silver-nanowires-epoxy-resin-composite-from-polymer-template
#14
Jie Zhou, Hua Li, Ran Tian, Roberto Dugnani, Huiyuan Lu, Yujie Chen, Yiping Guo, Huanan Duan, Hezhou Liu
In recent years shape-memory polymers have been under intense investigation due to their unique mechanical, thermal, and electrical properties that could potentially make them extremely valuable in numerous engineering applications. In this manuscript, we report a polymer-template-assisted assembly manufacturing strategy used to fabricate graphite/silver nanowires/epoxy resin (PGSE) composite. In the proposed method, the porous polymer foams work as the skeleton by forming three-dimensional graphite structure, whereas the silver nanowires act as the continuous conductive network...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715749/self-assembly-of-zinc-hydroxystannate-on-amorphous-hydrous-tio2-solid-sphere-for-enhancing-fire-safety-of-epoxy-resin
#15
Wei Wang, Yongchun Kan, Jiajia Liu, Kim Meow Liew, Lei Liu, Yuan Hu
Zinc hydroxystannate (ZHS) was fabricated on the surface of amorphous hydrous TiO2 solid spheres (AHTSS) via a layer-by-layer method for improving the fire safety of epoxy resin. AHTSS@PEI@ZHS was prepared by self-assembly of AHTSS, PEI and ZHS. The well-organized fabrication process was proved by TEM, XPS, XRD and SEM tests. TG results illustrated that the incorporation of AHTSS@PEI@ZHS show a higher residue compared with the addition of AHTSS or ZHS alone. In addition, AHTSS@PEI@ZHS filled EP composites exhibits improved flame retardancy and smoke suppression properties evaluated by cone calorimeter test...
June 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28713512/laboratory-evaluation-of-the-effect-of-unfilled-resin-after-the-use-of-self-etch-and-total-etch-dentin-adhesives-on-the-shear-bond-strength-of-composite-to-dentin
#16
Ehsan Baradaran Nasseri, Sara Majidinia, Davood Aghasizadeh Sharbaf
BACKGROUND: Based on the frequent application of composite resins as tooth-colored fillings, this method is considered a viable alternative to dental amalgam. However, this method has the low bond strength of the composite to dentin. To solve this issue, various dental adhesive systems with different characteristics have been developed by dentistry experts. AIM: To assess the effect of an additional layer of unfilled resin in self-etch and total-etch dentin adhesives on the shear bond strength (SBS) of composite to dentin...
May 2017: Electronic Physician
https://www.readbyqxmd.com/read/28712740/aspects-of-adhesion-tests-on-resin-glass-ceramic-bonding
#17
Andrew Chi Ho Wong, Tian Tian, James Kit Hon Tsoi, Michael Francis Burrow, Jukka Pekka Matinlinna
OBJECTIVES: This study aimed to compare and contrast two resin-ceramic bond strength tests, the tensile bond strength and the four-point bending tests. The effects of hydrofluoric acid (HF) etching time and storage condition on bond strength were also studied. METHODS: Ceramic beams (N=480) with the dimensions of 2.00×2.00×12.45mm(3) were sectioned from lithium disilicate ceramic ingots (IPS e.max CAD), then polished and fired for final crystallization. The joint surfaces were etched with HF gel (IPS Ceramic etching gel) for 20s, 40s, or 60s of each group (n=160)...
July 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28712739/biocompatibility-and-bond-degradation-of-poly-acrylic-acid-coated-copper-iodide-adhesives
#18
Adi ALGhanem, Gabriela Fernandes, Michelle Visser, Rosemary Dziak, Walter G Renné, Camila Sabatini
OBJECTIVE: To investigate the effect of poly-acrylic acid (PAA) copper iodide (CuI) adhesives on bond degradation, tensile strength, and biocompatibility. METHODS: PAA-CuI particles were incorporated into Optibond XTR, Optibond Solo and XP Bond in 0.1 and 0.5mg/ml. Clearfil SE Protect, an MDPB-containing adhesive, was used as control. The adhesives were applied to human dentin, polymerized and restored with composite in 2mm-increments. Resin-dentin beams (0.9±0...
July 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28712632/fracture-resistance-of-endodontically-treated-teeth-restored-with-2-different-fiber-reinforced-composite-and-2-conventional-composite-resin-core-buildup-materials-an-in%C3%A2-vitro-study
#19
Ashly Mary Eapen, L Vijay Amirtharaj, Kavitha Sanjeev, Sekar Mahalaxmi
INTRODUCTION: The purpose of this in vitro study was to comparatively evaluate the fracture resistance of endodontically treated teeth restored with 2 fiber-reinforced composite resins and 2 conventional composite resin core buildup materials. METHODS: Sixty noncarious unrestored human maxillary premolars were collected, endodontically treated (except group 1, negative control), and randomly divided into 5 groups (n = 10). Group 2 was the positive control. The remaining 40 prepared teeth were restored with various direct core buildup materials as follows: group 3 teeth were restored with dual-cure composite resin, group 4 with posterior composite resin, group 5 with fiber-reinforced composite resin, and group 6 with short fiber-reinforced composite resin...
July 13, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28711338/in-vitro-cytocompatibility-of-dental-resin-monomers-on-osteoblast-like-cells
#20
Dominik Kraus, Markus Wolfgarten, Norbert Enkling, Ernst-Heinrich Helfgen, Matthias Frentzen, Rainer Probstmeier, Jochen Winter, Helmut Stark
OBJECTIVES: Dental resin-based materials are widely used in modern dentistry. Especially, resin cements enjoy great popularity and are utilized in many applications. Nevertheless, monomers could be released from the resinous matrix, thus interact with surrounding tissues, cause adverse biological reactions and may lead in cases of implant retained restorations to peri-implant bone destruction. Hence, we performed an in-vitro study to determine cytotoxicity of resin monomers on osteoblast-like cells...
July 12, 2017: Journal of Dentistry
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