Sealer placement techniques have not been examined in teeth with curved canals prepared with Lightspeed instruments. Three traditional methods of placing sealer were studied, using 45 extracted human single-rooted teeth, divided into 3 groups of 15. Root canal preparations were made with Light-speed nickel-titanium, engine-driven instruments. AH26 sealer was applied with either K-file, lentulo ...

Understanding the causal impact of beliefs on contributions in Threshold Public Goods (TPGs) is particularly important since the social optimum can be supported as a Nash Equilibrium and best-response contributions are a function of beliefs. Unfortunately, investigations of the impact of beliefs on behavior are plagued with endogeneity concerns. We create a set of instruments by cleanly and exo...

Constructionist paradigms provide an opportunity to help learners find personal relevance and interest in originally unappealing or foreign subjects. Using constructionism as the driving force behind our design decisions, we have developed String Theory: a musical simulation app designed to generate interest driven learning across two subjects: physics and music. Through the manipulation of a s...

We develop results for the use of LASSO and Post-LASSO methods to form firststage predictions and estimate optimal instruments in linear instrumental variables (IV) models with many instruments, p, that apply even when p is much larger than the sample size, n. We rigorously develop asymptotic distribution and inference theory for the resulting IV estimators and provide conditions under which th...

Rheumatoid arthritis (RA) is chronic, progressive systemic inflammatory disease that if uncontrolled may lead to significant joint damage, dysfunction, work disability and other sequelae that result in large economic losses. A rich literature estimating the economic burden of RA, has been intensified recently, driven by costly biologic agents that have had a notable effect improving the outcome...

The computing technology ecosystem is today facing with the Internet of Things (IoT) innovation, driven by radical technological and methodological changes, which include communications paradigms among devices as well as instruments to enable the creation of added-value services on top of them. Although a number of platforms are today available to address the IoT needs at different level, few o...