3 F a bstract he purpose of treating furcal perforation is to sea rtificial communication between the endodontic spa nd the periradicular tissue to prevent alveolar b esorption and damage to the periodontal ligame hese complications are not infrequent in cases urcal and/or old perforations, which show a w rognosis than fresh, small, coronal, and apical pe ations. Mineral trioxide aggregate (MTA...

Water flow is an essential factor in the sealability of any underground cavern, including those for nuclear waste disposal, and significantly affected by permeability rock. The rocks various factors, stress temperature. rock changes excavating a temperature decay heat from waste, change induces thermal stress. Therefore, water around such caverns must be evaluated considering effects Numerical ...

Polystyrene and polystyrene copolymers have many unique properties that make them desirable for use in flexible packaging. Polystyrene monofilms however are not practical for use on high-speed packaging lines due to their poor heat sealability and flex cracking. Coextruded films of polystyrene with polyethylene combine the desirable properties of polystyrene with polyethylene. Still, PS coextru...

The measurement of wellbore annulus gas-liquid two-phase flow in CBM (coalbed methane) wells is of great significance for reasonably developing gas drainage and extraction processes, estimating CBM output, judging the operating conditions of CBM wells and analyzing stratum conditions. Hence, a specially designed sensor is urgently needed for real-time measurement of gas-liquid two-phase flow in...

PURPOSE The objective of this in-vitro study was to measure and compare microleakage around preventive resin restorations prepared conventionally or with air abrasion, in the presence or absence of acid etching. METHODS One hundred extracted human non carious molars were assigned to each of four groups. Group A: fissures opened with a high speed handpiece, etched, and restored with composite ...

OBJECTIVE One of the principle purposes of root canal obturation is to obtain hermetic sealing of the root canal system. According to the development of technology, many materials are now used in root canal filling. An in vitro dye leakage study was performed to evaluate the apical sealability of White-colored Mineral Trioxide Aggregate (WMTA) and Gray-colored Portland Cement (GPC) when used al...

Abstract Geopolymer material has a potential to function alongside Portland Cement as an efficient cementitious for well cementing and plug abandonment applications. requires retarding agents be displaced into the while considering properties required maintain zonal isolation through superior mechanical properties. Chemical admixtures affect structure can, in some cases, jeopardize integrity if...