Most of the dental materials available on market are still based traditional monomers such as bisphenol A-glycidyl methacrylate (Bis-GMA), urethane dimethacrylate (UDMA), triethyleneglycol (TEGDMA), and ethoxylated bisphenol-A (Bis-EMA). The interactions that arise in monomer mixture characteristics resulting polymer network most important factors, which define final properties materials. use three different proper proportions may create a strong matrix. In this paper, fourteen resin...

Bisphenol A-glycidyl methacrylate (bis-GMA) and urethane dimethacrylate (UDMA) are usually combined with low-viscosity monomers to obtain more desirable viscosity, handling characteristics general properties. The present study determined the flexural strength (FS), modulus (FM), diametral tensile (DTS), hardness (HV) of five matrices composites based on these resins. polymerization shrinkage stress (PSS) was also studied for composites. polymer were formed using bis-GMA UDMA. TEGDMA, HEMA...

Custom mouthguards are used in various sports disciplines as a protection for teeth, temporomandibular joints, and soft tissues of the oral cavity from impact forces. The purpose this research was to evaluate mechanical properties flexible polymeric 3D-printable materials select material with most favourable physical making intraoral protectors. Four were selected evaluation: IMPRIMO LC IBT (Scheu-Dental, Iserlohn, Germany), Keyortho (EnvisionTEC, Gladbeck, (Formlabs, Somerville, MA, USA),...

The aim of this study was to evaluate cytotoxicity and genotoxicity calcium-silicate based sealers comparing them with a gold standard-an epoxy-based sealant. Two experimental cell lines were used, gingival fibroblasts (hGF) monocyte/macrophage peripheral blood line (SC). (XTT assay) (comet evaluated both after 24-h 48-h incubation. Additionally, incubation, the apoptosis cycle progression detected. BioRoot Flow induced significant decrease in hGF cells viability compared negative control...

Resin matrix dental materials undergo contraction and expansion changes due to polymerization water absorption. Both phenomena deform resin-dentin bonding influence the stress state in restored tooth structure two opposite directions. The study tested three composite resin cements (Cement-It, NX3, Variolink Esthetic DC), adhesive (Estecem, Multilink Automix, Panavia 2.0), seven self-adhesive (Breeze, Calibra Universal, MaxCem Elite Chroma, SA Cement Plus, RelyX U200, SmartCem 2, SpeedCEM...

The contraction stress generated during the photopolymerization of resin dental composites is major disadvantage. water sorption in oral environment should counteract stress. purpose was to evaluate influence composite materials on polymerization shrinkage at restoration-tooth interface. following were tested: Filtek Ultimate, Gradia Direct LoFlo, Heliomolar Flow, Tetric EvoCeram, EvoCeram Bulk Fill, EvoFlow, EvoFlow X-tra Base, Venus BulkFil, and Ceram.X One. measured immediately after...

Contemporary self-etch and multi-mode adhesives were introduced to ensure a fast reliable bonding procedure. Yet, in terms of bond strength stability they failed perform as well two-bottle, etch-and-rinse adhesives, which remain the gold standard durability. The purpose this study was assess shear (SBS) dental dentin with different application protocols. Two (Adper Easy One Xeno V) two (Single Bond Universal Prime&Bond Select) used study. highest SBS obtained for Single applied three layers,...

In restorative dentistry, there are no standardized in vitro accelerated aging methods to evaluate the long-term stability of dental composites. Current research aimed at extending clinical success restorations emphasizes need for post-aging evaluation. This study represents final stage assessing three selected protocols that utilize a 0.1 M sodium hydroxide solution as primary agent accelerate degradation processes. Twelve resin-based composites, categorized into five types, were evaluated...

To examine the presence of microbial species in primary and secondary infections identify signs symptoms associated with them.A total number 37 root canals from 33 patients undergoing canal treatment were selected. Samples taken using a sterile paper point following chemomechanical instrumentation. Microbiological identification was performed by macromorphological, micromorphological commercial biochemical tests (ATB system). The antibiotic susceptibility profile isolated Enterococcus,...

Abstract Aim of the study was to evaluate influence filler amounts on mechanical properties and contraction stress light-curing experimental composite. Hardness, flexural strength, diametral tensile strength material filled with 40, 50 or 60 wt. % silanized silica were tested. The measured after 24 h by means photoelastic study. addition 40-60 composite caused significant increase in hardness, Young’s modulus strength. DTS , incorporating into polymer matrix, valued at ~26 MPa. containing 40...

The clinical performance of a dental restoration is strongly influenced by the complex and dynamically-changing oral environment; however, no standard procedure exists to evaluate this lifetime. This research provides an in-depth analysis effect different aging procedures on flexural strength (FS), diametral tensile (DTS) hardness (HV) selected materials (Resin F, Flow-Art Arkon). Material structure was evaluated scanning electron microscopy. It found that each protocol had some influence...

Due to its unique properties, zirconia is increasingly being used in dentistry, but surface preparation for bonding difficult because of polycrystalline structure. This study aimed determine the effect a new etching technique (Zircos-E) on Ceramill Zi (Amann Girrbach). The and use primers (Monobond Plus MKZ Primer) bond strength with resin cement (NX3) was assessed. Shear evaluated after storage water 24 h thermal aging (5000 thermocycling at 5 °C/55 °C). A scanning electron microscope...

AbstractThe influence of strontium on the silicon modification and aluminium-copper eutectic microstructures in 319 aluminium alloy was examined. The levels considered were between 8 96 ppm. purpose this study is: (i) to observe effects degree alloy, (ii) determine level area fraction copper phases. determined using American Foundrymen's Society (AFS) specification. fractions phases examined scanning electron microscopy (SEM) quantitative image analysis (IA). This investigation showed that a...

We have measured the quantum detection efficiency (QDE) of potassium bromide as a photocathode applied directly to surface microchannel plate over 250-1600A wavelength range. The contributions material in channels and on interchannel web QDE been determined. Two broad peaks centered at ~450 ~1050 A are apparent, former with ~50% peak latter ~40% QDE. photoelectric threshold is observed ~1600 A, there narrow minimum ~750 which correlates 2x band gap energy for KBr. angular variation from 0 40...

Modifying the composition of dental restorative materials with antimicrobial agents might induce their antibacterial potential against cariogenic bacteria, e.g., S.mutans and L.acidophilus, as well antifungal effect on C.albicans that are major oral pathogens. Essential oils (EOs) widely known for activity successfully used in industry. The study aimed at evaluating EOs composite resin material (CR) modified EO Ten (i.e., anise, cinnamon, citronella, clove, geranium, lavender, limette, mint,...

The aim of this article was to compare the biomechanical properties commercial composites containing different photoinitiators: Filtek Ultimate (3M ESPE) camphorquinone (CQ); Estelite Σ Quick (Tokuyama Dental) with CQ in RAP Technology®; Tetric EvoCeram Bleach BLXL (Ivoclar Vivadent AG) and Lucirin TPO; Evoceram Powerfill IVB Ivocerin TPO. All samples were cured a polywave Valo Lamp (Ultradent Products Inc.) 1450 mW/cm2. microhardness, hardness by Vicker's method, diametral tensile strength,...

The assessment of microgaps at the implant–abutment interface is an important factor that may influence clinical success. Thus, aim this study was to evaluate size between prefabricated and customised abutments (Astra Tech, Dentsply, York, PA, USA; Apollo Implants Components, Pabianice, Poland) mounted on a standard implant. measurement microgap performed using micro-computed tomography (MCT). Due 15-degree rotation samples, 24 microsections were obtained. Scans four levels established...

Chlorhexidine (CHX) is a widely known and very popular antibacterial agent that decreases the level of cariogenic bacteria. CHX applied on cavity surface dentine may influence adhesive bond strength. The aim study was to evaluate after different chlorhexidine digluconate (CHG) application protocols. Different CHG protocols were introduced. A concentration 0.2% or 2.0% etched unetched for 15 30 s, then water rinsed drained. Scanning electron microscopy (SEM) observations energy disperse...