Abstract Objectives of the study were to investigate biomechanical properties severely compromised premolars restored with composite restorations using finite element analysis (FEA), and in vitro fracture resistance test. A 3-D model an endodontically treated premolar was created Solidworks. Different modelled (direct restoration-DR; endo-crown-EC; post, core, crown-C) two different supporting tissues: periodontal ligament/alveolar bone (B), polymethyl methacrylate (PMMA). Models two-point...

The aim of this study was to determine surface roughness and topography polished dental resin-based nanocomposites. Four representative nanocomposites were tested in the study: two nanohybrids (Filtek Z550 Tetric EvoCeram) nanofilled Ultimate Body Filtek Translucent); reference materials: one microfilled (Gradia Direct) microhybrid Z250). Polymerized cylindrical specimens (4 mm x 2 mm) with multi-step polishing system-Super Snap. Immediately after polishing, each specimen examined by Veeco...

AimTo analyze the influence of cavity design preparation on stress values in three-dimensional (3D) solid model maxillary premolar restored with resin composite.Methods3D second was designed using computed-tomography (CT) data. Based a factorial experiment, 9 different mesio-occlusal-distal (MOD) designs were simulated, three wall thicknesses (1.5 mm, 2.25 3.0 mm), and cusp reduction procedures (without reduction, 2.0 mm palatal buccal reduction). All MOD cavities simulated direct composite...

Aim . The aim of this study was to evaluate the radiographic technical quality endodontic treatment performed by undergraduate students at School Dentistry, Faculty Medicine, University Novi Sad, Serbia. Materials and Methods Electronic records 220 patients treated final-year during school year 2011/2012 were examined, final sample consisted 212 patients, 322 teeth, 565 root canals. criteria for overall adequacy canal fillings defined as presence adequate length density absence iatrogenic...

Dental restorative materials need to be carefully engineered and designed in order meet many different clinical requirements. The oral biomaterials have possess such properties which enable them withstand the conditions present environment. improvements dental science are main initiators of entire professional progress. In exploit all improved characteristics new commercial materials, clinicians familiar with working mechanisms processing methods, able choose best therapeutic condition for...

Pregnancy may pose an increased risk for the development of caries and other oral health problems. Continuous screening status, implementing appropriate preventive measures (particularly hygiene, healthy diet plans education) is paramount importance not only but also general status future mother her offspring. EFFECTS OF FOOD ON CARIES DEVELOPMENT: Caries prevention through implicates reduction in frequency amount intake cariogenic food, above all ofrefined carbohydrates, i.e. sugars sweets....

An endodontically treated tooth with mesial-occlusal-distal (MOD) cavity is often restored composite resin. Palatal and buccal cusp reduction (MODP, MODPB), and/or fiber-reinforced posts (P), are used in an attempt to improve the longevity of restoration. The aim this study was determine effects these procedures on von Mises stress values distribution dental tissues restorative materials using finite element analysis. Based CT scans extracted second upper premolar, six 3D models (MOD, MODP,...

Dental clinicians need to consider the engineering properties of dental restorative materials during creating restoration plan that provide best therapeutic outcome. In oral environment, are exposed various physico- chemical, biological and mechanical challenges. have be sufficiently mechanically resistant withstand high occlusal forces occur in mouth chewing. These can reach values 200 N anterior region, up 800 lateral segments, or even 3500 some abnormal jaw movements teeth contacts....

The aim of this study was to analyse the influence artificial saliva on a three-dimensional (3-D) surface texture contemporary dental composites. representatives four composites types were tested: nanofilled (Filtek Ultimate Body, FUB), nanohybrid Z550, FZ550), microfilled (Gradia Direct, GD) and microhybrid Z250, FZ250). specimens polymerised polished by multistep protocol (SuperSnap, Shofu). Their examined, before after 3 weeks' exposure storage. analysed using atomic force microscope...

The aim of the present study was to investigate influence three post-and-core systems and two crown materials on stresses in restored premolars using Finite Element Analysis (FEA).

High accuracy dental impression is usually a first step during fabrication of indirect restorations that have to be seated in or on prepared teeth. The dimensional stability the material could an influence final restoration. Elastomeric materials (addition- cured silicones and condensation- silicones) are most frequently used as fixed prosthodontics. composition type chemical reaction determine urgency cast digitize impression. aim this study was asses addition condensation - time. Stainless...

Nanotechnology has been considered as multidisciplinary field of scientific research about different types nanoparticles well the application new nanomaterials and nanodevices in numerous areas human interest. It offers advances industry, engineering, information communication technology, electronics, environmental science energy savings, economics etc. New nanoproducts nanotehnology could be applied almost all fields activity. Potential benefit nanorobots medicine dentistry is main concern...

We describe a real-time holographic technique used to observe dental contraction due photo-polymerization of filling during LED lamp illumination. An off-axis setup was used, with wet in-situ processing the plate, and consequent recording interference fringes using CCD camera. Finite elements method calculate internal stress tissue, corresponding experimentally measured deformation. A enables selection preferred illumination reduced polymerization contraction. As consequence, durability...

An experimental technique to reveal the effects of dental polymer contraction is established choose most appropriate polymerization technique. Tooth deformation following a filling analyzed using double-exposure holographic interferometry. A caries-free, extracted human molar mounted in gypsum and different cavity preparations fillings are made on same tooth. Dental composite polymerized by an LED light source especially designed for this purpose. Holographic interferograms occlusal (class...

The aims of this study were to examine the ultimate strength restored maxillary incisors with composite resin, dental amalgam and glassionomer cement as a transitional restoration.Fifty-six extracted human central intact carious dentin used.The control group consisted eight unrestored teeth dentin.Artificial defect in was up half anatomic crown tooth.After core build-up procedure, each root every specimen mounted autopolymerizing acrylic resin blocks which stored distilled water at 37°C one...

We have developed a real-time holographic technique to observe deformation induced by dental composite contraction. The standard split beam method was used, in conjunction with situ plate processing. Experiments were performed on mechanical model of human tooth cavity. A silicone mold used manufacture number identical casts, using photoactivated composite. LED lamp induce photo-polymerization reaction shown that the proposed is ideal analyze various polymerization strategies, purpose...

Polymerization shrinkage is one of the most critical properties esthetic resin-based dental restorative materials and may have a negative impact on their clinical performance.As composite adhesively bonded, contraction material that occurs during polymerization causes stress strain hard tissues.Polymerization also affects maintenance bonded interface between resin tissues.The aim this study to present holographic interferometry as method for detecting measuring tissue caused by...

Mechanical properties of restorative material have an effect on stress distribution in the tooth structure and during mastication. The aim this study was to investigate influence materials with different moduli elasticity three-dimensional (3D) solid model. Computed tomography scan data human maxillary second premolars were used for 3D model generation. Four composite resins a modulus 6700, 9500, 14 100 21 000 MPa considered simulate four clinical direct restoration types. Each subjected...

Polymerization contraction of dental photo-polymer composites induces internal stress, in a tooth cavity.This stress is measured indirectly by, first, holographic determination deformation, with consequent calculation using finite element method.Real time technique enabled observation deformation all stages polymerization.Specially constructed blue-LED light source was used to polymerize photopolymer composite.We have found that polymerization continues even after illumination...

Adhesion to enamel has become a routine technique in restorative dentistry. dentin, however, is still under investigation. Except structural elements of the smear layer been one reasons that interaction between adhesive system and this tissue difficult. The created by cutting tooth. It varies thickness, roughness, density degree attachment andoccludes tubules reduces dental permeabilita. Dentin adhesivesystems can react with intertubular peritubular dentin only when removed or capable...