This work investigates the effect of fibre architecture on mechanical properties composite laminates fabricated from natural sisal fibres reinforced with polyethylene polymer matrix. The main objective for this is to determine which architectural pattern produces best material in terms that can be employed use fabrication engineering components replace more expensive produced highly synthetic m...

The penetration coefficients (PC) and tensile bond strengths of two pit and fissure sealants and a low viscosity bonding resin were evaluated. The penetration coeftYcients of the resin systems were determined at 22°C. Five determinations were done with each resin. Bonded test specimens were loaded to failure in the tensile mode in an Instron testing macl~’ne. Ten specimens were prepared with ea...

The relevance of the study is conditioned by fact that most popular and irreplaceable materials have found wide application in aerospace industry are composites based on quartz materials. These distinguished their high mechanical electrical strength, chemical corrosion resistance. In this regard, it interest to obtain a composite material combines low specific gravity, processability polymers, ...

The tensile strengths of 12 commercially available brands of epidural catheters were assessed using an Instron material testing device. The mean values of the tensile strengths ranged from 1.89 to 3.74 kilogram force. The extent of catheter occlusion due to kinking was also studied using an in vitro apparatus designed to simulate drug delivery at various degrees of flow restriction. It was dete...

STATEMENT OF PROBLEM Recently Yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) has been introduced due to superior flexural strength and fracture toughness compared to other dental ceramic systems. Although zirconia has outstanding mechanical properties, the phenomenon of decrease in the life-time of zirconia resulted from degradation in flexural strength after low temperature aging h...

STATEMENT OF PROBLEM Use of custom tray and tray adhesive is clinically recommended for elastomeric impression material. However there is not clear mention of drying time of tray adhesive in achieving appropriate bonding strength of tray material and impression material. PURPOSE This study is to investigate an appropriate drying time of tray adhesives by evaluating tensile bonding strength be...

Evaluation of the material properties of regenerate bone is of fundamental importance to a successful outcome following distraction osteogenesis using an external fixator. Plain radiographs are in widespread use for assessment of alignment and the distraction gap but are unable to detect bone formation in the early stages of distraction osteogenesis and do not quantify accurately the structural...

introduction: the aim of this study was to determine the effect of different luting agents on fracture resistance of endodontically treated teeth restored with casting post. materials and methods: in this experimental study, forty extracted human maxillary central incisors teeth with the mean length of 23mm were randomly assigned in to four groups. all the studied teeth were caries free without...

introduction: vertical root fracture (vrf) is common in endodontically treated teeth. conventional and digital radiographies have limitations for detection of vrfs. cone-beam computed tomography (cbct) offers greater detection accuracy of vrfs in comparison with conventional radiography. this study compared the effects of metal artifacts on detection of vrfs by using two cbct systems. methods a...

background and aims. substituting chlorhexidine (chx) for water has been shown to enhance antimicrobial activity of mineral trioxide aggregate (mta). the purpose of this study was to compare the compressive strength of mta mixed with distilled water, 0.12% and 0.2% chlorhexidine. materials and methods. mta was mixed according to manufacturer’s instructions in group i (n = 20). in groups ii & ii...