INTRODUCTION The conventional method of teaching endodontics has some drawbacks. Due to the small size of the oral cavity, students cannot closely observe the clinical procedure. Use of new teaching modalities such as the intraoral camera may obviate this problem. This study assessed the effect of video-assisted clinical instruction in dentistry (VACID) on dental student's knowledge and perform...

At least 29 species of fossil primates have been referred to fruit, nectar, and/or exudate feeding dietary niches. Many studies have detailed the morphological correlates of fruit feeding in comparison to insectivory and folivory. In contrast, few studies have sought to differentiate the morphological correlates of fruit feeding from those of nectar and exudate feeding. This study investigates ...

Mechanisms of microscale wear in siliconbased microelectromechanical systems (MEMS) are elucidated by studying a polysilicon nanotractor, a device specifically designed to conduct friction and wear tests under controlled conditions. Photoelectron emission microscopy (PEEM) was combined with near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and atomic force microscopy (AFM) to quan...

Using a novel audit methodology, we show that reputation concerns and norms against price gouging can lead to breakdown in ex post efficient trade. Sellers in a market in India do not use their increased bargaining power to charge higher prices when customers have a shock, but, rather, forgo the order. However, when customers offer a higher price, sellers are significantly more likely to accept...

abdominal cystic lymphangioma is a rare benign neoplasm. less than 1% of lymphangiomas is in the retroperitoneum. lymphangioma is mostly asymptomatic. chronic symptoms were reported in retroperitoneal type more than others. acute symptoms due to complications like infection, cyst rupture or hemorrhage may occur. we report an 18-years-old girl with low back pain from 6 months ago with huge pelvi...