Effects of oral exposure to silver nanoparticles on the sperm of rats

It has been demonstrated that exposure to silver nanoparticles (AgNPs) can induce toxicological effects in rodents. In this study, we investigated whether sub-chronic oral exposure to different doses of polyvinil pyrrolidone (PVP)-coated AgNPs (PVP-AgNPs) (50, 100 and 200mg/kg/day) could induce harmful effects on epididymal sperm rat parameters. Sperm motility, viability and morphology were examined. Moreover, a histological evaluation of testis and epididymis was also performed. High doses of PVP-AgNPs showed higher sperm morphology abnormalities, while a progressive, but not significant effect, was observed in other sperm parameters. The current results suggest that oral sub-chronic exposure to PVP-AgNPs induces slight toxicological effects in sperm rat parameters.

SEM Analysis of Hybrid Layer and Bonding Interface After Chlorhexidine Use

More studies suggest that the bond between composite and dentin degrades over time because of the action of matrix metalloproteinase on collagen fibrils left unprotected by acid etching. Clinical actions should be taken to prevent this from happening and thus the failure of what should be a very long-term restoration.

Ruptured spinal arteriovenous malformation causing cauda equina syndrome: case report

We describe the case of an acute cauda equina syndrome secondary to a confined subarachnoid bleed from a spinal arteriovenous malformation. The patient was elderly and made a complete neurological recovery following surgery.

Meningioma recurrence at a different site masquerading as a subdural hematoma. Case report

It is unusual for a meningioma to recur at a distant site. It is more unusual for a meningioma to present as a subdural hematoma. The authors report a unique case in which both of these events occurred in the same patient during a 4-year period. The authors discuss the pathogenesis of these rare events with regard to meningiomas.