Background & Aims of the Study: Azo dyes are used in industrial processes such as textile industry to produce large quantities of colored effluents that contain organic and non-organic materials. So, effective and efficient treatment of them is important for the environmental protection. The aim of this study was to evaluate the efficiency of powder and granular pumice for the ...

background: a prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. the use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. the aim of this investigation was to compare the microleakage level of fissure sealants prepared by a fissurotomy bur or pumice prophylaxis prior ...

Abstract Many species of seabird ingest or are provisioned with pumice stones, buoyant volcanic rocks that thought to aide in digestion, occasionally during times poor prey availability. Unlike other indigestible matter, like plastics, the effect on chick growth, its relationship ingested and variation among years has not yet been examined. We analysed amount from 739 Flesh-footed ( Ardenna car...

AIM & OBJECTIVES The purpose of this in vitro study was to evaluate and compare the microleakage of pit and fissure sealants after using six different preparation techniques: (a) brush, (b) pumice slurry application, (c) bur, (d) air polishing, (e) air abrasion, and (f) longer etching time. MATERIAL & METHOD The study was conducted on 60 caries-free first premolars extracted for orthodontic p...

This paper summarizes results of a study of porosity, permeability, microstructure and acoustic properties of volcanic and pyroclastic rocks fromCampi Flegrei (CF) andMt. Etna (ET), Italy. We have measured the hydraulic, transport and acoustics properties of 28 room-dry samples at ambient conditions, 25 room-dry samples under confining pressure (up to 60 MPa) and 5 brine saturated samples under...

background dyes are one of the most important industrial pollutants, especially in textile industries. many methods have been proposed in order to remove color from wastewater among which, adsorption is more acceptable due to the ability for its use in the large scale. objectives the objective of this study was to investigate pumice as an inexpensive adsorbent for removal of methylene blue from...

statement of the problem: demineralization of enamel adjacent to orthodontic appliances frequently occurs, commonly due to insufficient oral hygiene. purpose: the aim of this study was to compare two microabrasion techniques on improving the white spot lesions as well as subsequent enamel discoloration. materials and method: sixty extracted premolar teeth without caries and hypoplasia were sele...

damavand is a large dormant stratovolcano in the alborz mountains of northern iran located in one of the most populous provinces, which could be adversely affected by tephra fall from damavand. the youngest known eruption is a lava flow on the western flanks with an age of 7.3 ka. the volcanic products are predominantly porphyritic trachyandesite. three major young pumice deposits, named here a...