OBJECTIVES The aim of this study was to evaluate the effects of chemical activation of hydrogen peroxide (HP) gel on colour changes and penetration through the tooth structure. METHODS One hundred and four bovine incisors were used. One dentine (CD) disc and one enamel-dentine (ED) disc were prepared from each tooth. They were positioned over artificial pulpal chambers and the bleaching was p...

Total disc replacement (TDR) surgeries have significantly increased in number since US FDA approval. However, the associated complications such as implant malposition, loosening, subsidence, implant migration, fractures, and infection may necessitate retrieval of the artificial disc and proceeding with interbody fusion. Retrieval of artificial discs in proximity to important vascular, urologica...

BACKGROUND Although total disc replacement has been performed for years outside the United States, relatively little available data address clinical outcomes, particularly data from prospective studies. We report the 24- to 36-month follow-up of one center's experience with the ProDisc-L artificial disc as part of a prospective, randomized trial comparing total disc arthroplasty to combined ant...

We analyse the performance of twelve different implementations of Smoothed Particle Hydrodynamics (SPH) using seven tests designed to isolate key hydrodynamic elements of cosmological simulations which are known to cause the SPH algorithm problems. In order, we consider a shock tube, spherical adiabatic collapse, cooling flow model, drag, a cosmological simulation, rotating cloud-collapse and d...

Medicinal plants have been representing a rich source of antimicrobial agent as well can be used antacid in various ayurvedic preparations. Hence the present study was undertaken to evaluate antibacterial potential and properties selected six plant extracts. The extracts such Methanolic Cassia tora (MECT), Pithecellobium dulce (MEPD), Chloroform Butea monosperma (CEBM), Butanolic Pongamia pinna...

In most hospitals in the United Kingdom and in many other countries, the provision of an artificial eye depends upon an exchange of information between an artificial eye fitter and an artificial eye manufacturer who may be situated some distance away and who, in most instances, does not see the patient. The centralization of manufacturing facilities may have some advantages and while, in genera...

Nanoscience has been one of the outstanding driving forces in technology recently, arguably more so in magnetism than in any other branch of science and technology. Due to nanoscale bit size, a single computer hard disk is now able to store the text of 3,000,000 average-size books, and today's high-performance permanent magnets--found in hybrid cars, wind turbines, and disk drives--are nanostru...

Providing Interactive Systems with educational capabilities is essential in order to achieve real effectiveness in simulation based training. However, the development cost of adding intelligence to those systems is huge. In this paper we present OLYMPUS, a generic learning platform that allows integrating Interactive Systems with an Intelligent Learning System. The platform is able to diagnose ...

Objective: This study aimed to investigate the effects of polishing system on color stability, surface roughness, and hardness resin composites in presence absence accelerated artificial aging (AAA).
 Methods: Six (Universal Restorative 200, G-Aenial Anterior, Ceram-X Duo, Admira, IPS Empress Direct, Clearfil Majesty Esthetic) were evaluated. Thirty disc-shaped samples prepared for each co...