objective: in this study, the effect of bur cutting efficacy was evaluated on microleakage of class v composite restorations with two adhesive systems. materials and methods: class v cavities were produced on sound extracted human teeth, which had been assigned randomly to one of six groups (n=15) as follows: groups 1 and 6 were prepared using used rough diamond bur; group 2 and 5 were prepared...

The steel shear wall and composite steel plate shear wall is introduced in recent three decade and is considered and is spread rapidly. Composite steel plate shear wall which is made of a layer of thin steel sheet with coating of reinforced concrete in one or both sides of steel palate is considered a third generation of resistance shear walls against lateral loads that in addition to increasin...

Aim. To compare and evaluate the microleakage in class V lesions restored with composite resin with and without liner and injectable nanohybrid composite resin. Materials and Methodology. 60 class V cavities were prepared in 30 freshly extracted teeth. After etching and application of bonding agents these cavities were divided into three groups: Group A (n = 20)-restored with composite resin, G...

There is an existing problem of cumulative hazardous effect of violet and near ultra-violet light which is produced by standard polymerisation units. Another restrict is shallow depth of cure, particularly of darker composite shades in premolar and molar region. Searching for better light source we used indium resonance lines from several indium high pressure lamps and tested curing effect on t...

let $g$ be a connected graph. the multiplicative zagreb eccentricity indices of $g$ are defined respectively as ${bf pi}_1^*(g)=prod_{vin v(g)}varepsilon_g^2(v)$ and ${bf pi}_2^*(g)=prod_{uvin e(g)}varepsilon_g(u)varepsilon_g(v)$, where $varepsilon_g(v)$ is the eccentricity of vertex $v$ in graph $g$ and $varepsilon_g^2(v)=(varepsilon_g(v))^2$. in this paper, we present some bounds of the multi...

In analogy with the notion of the composite semi-valuations, we deene the composite G-valuation v from two other G-valuations w and u. We consider a lexicographically exact sequence (a;) : Au ! Bv ! Cw and the composite G-valuation v of a eld K with value group Bv. If the assigned to v set Rv = fx 2 K=v(x) 0 or v(x) non comparable to 0g is a local ring, then a G-valuation w of K into Cw is deen...

An electrochemical biosensor using tyrosinase was constructed for the determination of catechol. The enzyme was extracted from a plant source Amorphophallus companulatus and entrapped in agarose-guar gum composite biopolymer matrix. Catechol was determined by direct reduction of biocatalytically liberated quinone species at -0.1 V versus Ag/AgCl (3M KCl). The response was found to be linear and...

Background: The aim of this study was to evaluate and compare the hepatotoxicity as well as antioxidants activities of hydromethanolic extract of six common traditional species (Origanum vulgar, Pterocarya fraxinifolia, Ferula assafoetida, Artemisia dracunculus, Rosmarinus officinalis, and Valerian officinalis) in order to find a safe antioxidant source. Methods: This research project was perf...

Requirements are often cited as one of the important factors in determining project success. Over the past 30 years requirements practice has changed. The new requirements engineering is facing new problems of complexity and continuous change. To address this New RE, researchers have proposed a new Six-V measurement model. This study provides an operationalization of the Six-V model and then us...

We develop new rate distortion bounds for narrowband and wideband speech coding based on composite source models for speech and perceptual PESQ-MOS/WPESQ distortion measures. It is shown that these new rate distortion bounds do in fact lower bound the performance of important standardized speech codecs, including, G.726, G.727, AMR-NB, G.729, G.718, G.722, G.722.1, and AMR-WB. The approach is t...