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https://www.readbyqxmd.com/read/29148914/marginal-gap-formation-in-approximal-bulk-fill-resin-composite-restorations-after-artificial-ageing
#1
A Peutzfeldt, S Mühlebach, A Lussi, S Flury
The aim of this in vitro study was to investigate the marginal gap formation of a packable "regular" resin composite (Filtek Supreme XTE [3M ESPE]) and two flowable "bulk fill" resin composites (Filtek Bulk Fill [3M ESPE] and SDR [DENTSPLY DeTrey]) along the approximal margins of Class II restorations. In each of 39 extracted human molars (n=13 per resin composite), mesial and distal Class II cavities were prepared, placing the gingival margins below the cemento-enamel junction. The cavities were restored with the adhesive system OptiBond FL (Kerr) and one of the three resin composites...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29148913/using-cross-polarized-photography-as-a-guide-for-selecting-resin-composite-shade
#2
C A Villavicencio-Espinoza, M H Narimatsu, A Y Furuse
The restoration of single discolored maxillary anterior teeth is still a difficult task, as not only shape and surface characterization play an important role in the success of the treatment, but the propagation of light throughout the restorative material does as well. In some cases, small changes in morphology, color, and brightness will be noticeable. These factors are sometimes very tricky, and shade guides alone are difficult to use for color selection. This article proposes a protocol of employing cross-polarization imaging for improving the accuracy of the shade selection of resin composites...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29148912/influence-of-different-restoration-techniques-on-fracture-resistance-of-root-filled-teeth-in-vitro-investigation
#3
M E Hshad, E E Dalkılıç, G C Ozturk, I Dogruer, F Koray
OBJECTIVE: The purpose of this study was to determine the fracture strength of endodontically treated mandibular premolar teeth restored with composites and different reinforcement techniques. METHODS AND MATERIALS: Forty-eight freshly extracted human mandibular premolar teeth were randomly divided into four groups: group IN, group CR, group FRC, and group PRF. Group IN consisted of teeth with intact crowns and served as the control group. In the other three groups, endodontic treatment was performed and standard mesio-occluso-distal (MOD) cavities were prepared...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29144874/evaluation-of-interfacial-gap-volume-of-two-low-shrinkage-composites-using-micro-computed-tomography
#4
Hna Al Nahedh, N S Sibai
OBJECTIVES: To investigate the efficacy of X-ray micro-computed tomography (μCT) in the detection and quantification of interfacial gap formation in standardized Class I and Class II resin composite restorations, to compare the interfacial gaps for two low-shrinkage resin composites with a methacrylate composite material, and to determine any correlation between the cavity configuration factor (C-factor) and the volume of gaps formed. METHODS AND MATERIALS: Sixty standardized Class I and Class II cavities were prepared and divided into six groups...
November 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29143388/in-vitro-assessment-of-retention-and-resistance-failure-loads-of-teeth-restored-with-a-complete-coverage-restoration-and-different-core-materials
#5
Vasileia Tsiagali, Yvoni Kirmanidou, Argirios Pissiotis, Konstantinos Michalakis
PURPOSE: To investigate in vitro the retention and the resistance form, as well as the failure modes of maxillary premolars restored with cast metal crowns and different core materials. MATERIALS AND METHODS: Sixty human extracted maxillary premolars were selected according to their size and were embedded in PMMA resin blocks. After removing a part of their clinical crowns, the teeth were randomly divided into 3 groups of 20 teeth and were either left unrestored, or they were restored with amalgam or composite resin...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29142879/effect-of-water-storage-on-flexural-strength-of-silorane-and-methacrylate-based-composite-resins
#6
Narges Panahandeh, Hassan Torabzadeh, Hani Naderi, Seyedeh Mahsa Sheikh-Al-Eslamian
Objectives: This study assessed the effect of water storage on the flexural strength (FS) of low shrinkage composites. Materials and Methods: A total of 165 bar-shaped specimens (2 × 2 × 25 mm) were fabricated of 2 low shrinkage composites (Filtek P90 [3M ESPE], GC Kalore [GC International]) and a conventional methacrylate-based composite (Filtek Z250 [3M ESPE]). The specimens were subjected to 3-point bending test at 6 time intervals, namely: immediately after curing, at 24 hours, 1 week, 1 month, 6 months, and 1 year following storage in wet and dry conditions...
November 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29142644/repair-bond-strengths-of-non-aged-and-aged-resin-nanoceramics
#7
Meryem Gülce Subaşı, Gülce Alp
PURPOSE: To explore the influence of different surface conditionings on surface changes and the influence of surface treatments and aging on the bond strengths of composites to non-aged and aged resin nanoceramics. MATERIALS AND METHODS: Rectangular-shaped non-aged and aged (5000 thermocycles) resin nanoceramic specimens (Lava Ultimate) (n=63, each) were divided into 3 groups according to surface treatments (untreated, air abrasion, or silica coating) (n=21). The surface roughness was measured and scanning electron microscopy was used to examine one specimen from each group...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29142642/shear-bond-strength-of-composite-resin-to-high-performance-polymer-pekk-according-to-surface-treatments-and-bonding-materials
#8
Ki-Sun Lee, Myoung-Sik Shin, Jeong-Yol Lee, Jae-Jun Ryu, Sang-Wan Shin
PURPOSE: The object of the present study was to evaluate the shear bonding strength of composite to PEKK by applying several methods of surface treatment associated with various bonding materials. MATERIALS AND METHODS: One hundred and fifty PEKK specimens were assigned randomly to fifteen groups (n = 10) with the combination of three different surface treatments (95% sulfuric acid etching, airborne abrasion with 50 µm alumina, and airborne abrasion with 110 µm silica-coating alumina) and five different bonding materials (Luxatemp Glaze & Bond, Visio...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29140719/effects-of-different-etching-methods-and-bonding-procedures-on-shear-bond-strength-of-orthodontic-metal-brackets-applied-to-different-cad-cam-ceramic-materials
#9
S Kutalmış Buyuk, Ahmet Serkan Kucukekenci
OBJECTIVE: To investigate the shear bond strength (SBS) of orthodontic metal brackets applied to different types of ceramic surfaces treated with different etching procedures and bonding agents. MATERIALS AND METHODS: Monolithic CAD/CAM ceramic specimens (N = 120; n = 40 each group) of feldspathic ceramic Vita Mark II, resin nanoceramic Lava Ultimate, and hybrid ceramic Vita Enamic were fabricated (14 × 12 × 3 mm). Ceramic specimens were separated into four subgroups (n = 10) according to type of surface treatment and bonding onto the ceramic surface...
November 15, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/29140098/surface-roughness-of-methacrylate-and-silorane-based-composites-after-finishing-and-polishing-procedures
#10
M Jacinta Santos, Heleine Maria Chagas Rêgo, Leticia Linares, Amin S Rizkalla, Gildo C Santos
OBJECTIVE: To compare the effect of surface finishing and polishing protocols on the surface roughness (Ra) of methacrylate-based and silorane-based resin composites. METHODS AND MATERIALS: Fifty specimens (5 mm x 2 mm) of each composite material were prepared using a split mold: Filtek™ Supreme Ultra (3M ESPE), Tetric EvoCeram® (Ivoclar Vivadent), Tetric Ceram™ HB (Ivoclar Vivadent), and Filtek™ LS Low Shrink (3M ESPE). Specimens were divided into five groups (n = 10) according to the following procedures: G1 - 15-µm fine diamond bur (FDB); G2 - 15-µm FDB followed by a 20-fluted tungsten carbide bur; G3 - 15-µm FDB followed by diamond-impregnated micropolishing points (D-FINE Double Diamond Polishing System, Clinician's Choice); G4 - 15-µm FDB followed by diamond-impregnated micropolishing points (Flame Point Pre-polisher and Shine, Brassseler USA); and G5 - 15-µm FDB followed by the application of a surface sealer (PermaSeal®, Ultradent Products, Inc...
November 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29139298/sic-nanofiber-mat-a-broadband-microwave-absorber-and-the-alignment-effect
#11
Yi Hou, Laifei Cheng, Yani Zhang, Yong Yang, Chaoran Deng, Zhihong Yang, Qi Chen, Xiaoqing Du, Lianxi Zheng
Fiber alignment is a key factor that determines the physical properties of nanofiber mats. In this work, SiC nanofiber mats with or without fiber alignment are fabricated via electrospinning and the microwave electromagnetic (EM) properties of their silicone resin composites (5wt.%) are investigated in 2-18 GHz. By comparing with the composite containing smashed nanofiber, it is found that the nanofiber mats show superior dielectric loss and a minimal reflection loss (RL) of around -49 dB at 8.6 GHz and 4.3 mm thickness, associated with a broad effective absorption (<-10 dB) bandwidth (EAB) of about 7...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29133964/in-vitro-evaluation-of-repair-bond-strength-of-composite-effect-of-surface-treatments-with-bur-and-laser-and-application-of-universal-adhesive
#12
Nazanin Kiomarsi, Melika Espahbodi, Nasim Chiniforush, Mohammad Javd Karazifard, Sedighe Sadat Hashemi Kamangar
Objectives: This study aimed to assess the effect of surface treatment by bur and laser and application of universal adhesive on repair bond strength of composite resin. Materials and Methods: A total of 120 composite blocks measuring 6×4×4 mm were fabricated of Filtek Z250 composite. All samples were subjected to 5,000 thermal cycles and divided into two groups for surface preparation by bur and by Er,Cr:YSGG laser (n = 60). The surfaces were then etched with orthophosphoric acid, rinsed with water and divided into three groups (silane, silane plus Single Bond and silane plus Single Bond Universal)...
September 30, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29131447/effect-of-various-treatment-modalities-on-surface-characteristics-and-shear-bond-strengths-of-polyetheretherketone-based-core-materials
#13
Ahmet Kürşat Çulhaoğlu, Serhat Emre Özkır, Volkan Şahin, Burak Yılmaz, Mehmet Ali Kılıçarslan
PURPOSE: To investigate the effect of different surface treatments on the surface roughness (Ra), wettability, and shear bond strength of polyetheretherketone (PEEK) to composite resin. MATERIALS AND METHODS: One hundred ninety eight PEEK specimens were divided into six groups (n = 33). Specimen surfaces were treated with the following surface treatment modalities: silicoating (CoJet), acetone treatment, acid etching (H2 SO4 ), airborne particle abrasion (Al2 O3 ), laser irradiation (Yb:PL laser), and the nontreated surface serving as the control...
November 13, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29130615/in-office-bleaching-efficacy-on-stain-removal-from-cad-cam-and-direct-resin-composite-materials
#14
Amal Alharbi, Stefano Ardu, Tissiana Bortolotto, Ivo Krejci
OBJECTIVE: To evaluate the efficacy of in-office bleaching on stain removal from stained resin composite and ceramic computer-assisted design/computer-assisted manufacturing (CAD/CAM) blocks and direct resin composites. METHODS: Forty disk-shaped samples were fabricated from each of nine materials: six CAD/CAM (VITABLOCS Mark II, Paradigm MZ100, Exp Vita Hybrid Ceramic, VITA ENAMIC, Exp Kerr, and LAVA Ultimate) and three direct resin composites (Filtek Supreme, Venus Diamond, and Filtek Silorane)...
November 11, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29128128/cad-fe-modeling-and-analysis-of-class-ii-restorations-incorporating-resin-composite-glass-ionomer-and-glass-ceramic-materials
#15
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Antonio Gloria, David C Watts
OBJECTIVES: To investigate the influence of specific resin-composite, glass ceramic and glass ionomer cement (GIC) material combinations in a "multi-layer" technique to replace enamel and dentin in class II mesio-occlusal-distal (MOD) dental restorations using 3D-Finite Element Analysis (FEA). METHODS: Four 3D-FE models (A-D) of teeth, adhesively restored with different filling materials, were created and analyzed in comparison with a 3D model (E) of a sound lower molar...
November 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29122073/survival-and-associated-risk-factors-of-resin-based-composite-restorations-in-primary-teeth-a-clinical-retrospective-university-based-study
#16
Djéssica Pedrotti, Jéssica Fogliato Ribeiro, Carine Weber Pires, Rachel de Oliveira Rocha, Thiago Machado Ardenghi, Fabio Zovico Maxnuck Soares, Tathiane Larissa Lenzi
PURPOSE: This clinical retrospective study evaluated the survival and risk factors associated with failures of resin-based composite restorations in primary teeth. METHODS: A total of 212 restorations in primary teeth from records of 76 high caries-risk children were included. The restorations' longevity for up to six years of follow-up was assessed using the Kaplan-Meier survival test. Multivariate Cox regression analysis with shared frailty was used to evaluate the factors associated with failures (P<0...
July 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/29118975/interfacial-microscopic-examination-and-chemical-analysis-of-resin-dentin-interface-of-self-adhering-flowable-resin-composite
#17
Tamer M Hamdy
Background: The newly introduced self-adhering flowable resin-composites decrease the required time for application by incorporation of an acidic adhesive monomer, thus reducing the number of the steps, but its bonding is still uncertain. The aim of this study was to evaluate the interfacial microscopic examination and chemical analysis at the resin-dentin interface of a self-adhering flowable resin composite (Vertise-Flow) versus a total-etch (Te-Econom Plus) resin composite, using an etching agent (Eco-Etch gel) and  bonding agent (Single Bond Universal)...
2017: F1000Research
https://www.readbyqxmd.com/read/29117652/microhardness-of-bulk-fill-composite-materials
#18
Katarina Kelić, Sanja Matić, Danijela Marović, Eva Klarić, Zrinka Tarle
The aim of the study was to determine microhardness of high- and low-viscosity bulk-fill composite resins and compare it with conventional composite materials. Four materials of high-viscosity were tested, including three bulk-fills: QuiXfi l (QF), x-tra fi l (XTF) and Tetric EvoCeram Bulk Fill (TEBCF), while nanohybrid composite GrandioSO (GSO) served as control. The other four were low-viscosity composites, three bulk-fill materials: Smart Dentin Replacement (SDR), Venus Bulk Fill (VBF) and x-tra base (XB), and conventional control material X-Flow (XF)...
December 2016: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29116744/transforming-a-simple-commercial-glue-into-highly-robust-superhydrophobic-surfaces-via-aerosol-assisted-chemical-vapor-deposition
#19
Aoyun Zhuang, Ruijin Liao, Yao Lu, Sebastian C Dixon, Arreerat Jiamprasertboon, Faze Chen, Sanjayan Sathasivam, Ivan P Parkin, Claire J Carmalt
Robust superhydrophobic surfaces were synthesized as composites of the widely commercially available adhesives epoxy resin (EP) and polydimethylsiloxane (PDMS). The EP layer provided a strongly adhered micro/nanoscale structure on the substrates, while the PDMS was used as a post-treatment to lower the surface energy. In this study, the depositions of EP films were taken at a range of temperatures, deposition times, and substrates via aerosol-assisted chemical vapor deposition (AACVD). A novel dynamic deposition temperature approach was developed to create multiple-layered periodic micro/nanostructures that significantly improved the surface mechanical durability...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29114427/adhesive-system-affects-repair-bond-strength-of-resin-composite
#20
Ozgur Irmak, Ozge Celiksoz, Begum Yilmaz, Batu Can Yaman
Purpose: This study evaluated the effects of different adhesive systems on repair bond strength of aged resin composites. Materials and Methods: Ninety composite discs were built and half of them were subjected to thermal aging. Aged and non-aged specimens were repaired with resin composite using three different adhesive systems; a two-step self-etch adhesive, a two-step total-etch adhesive and a one-step self-etch adhesive; then they were subjected to shear forces...
2017: J Istanb Univ Fac Dent
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