introduction: the success of endodontic retreatment is related to the complete removal of the obturation material from the root canal system. the aim of this study was to evaluate the efficacy of mtwo r and protaper retreatment files in removing the resilon/epiphany system with or without chloroform during retreatment. materials and methods: sixty distal roots of first mandibular molars were pr...

OBJECTIVES The purpose of this in vitro study was to evaluate gaps or voids occurring in roots filled with three different sealers. METHODS Thirty extracted human single-rooted teeth were decoronated, instrumented using NiTi rotary instruments, divided into three groups (n=10 per group) and obturated with one of the following: Epiphany with Resilon, MetaSEAL with gutta-percha or AH Plus with ...

Hey there! If you’re just joining us, we’ve been talking about seminars, good and bad. And that terrific movie, The Sting, directed by the inimitable George Roy Hill. The one with Robert Redford, Paul Newman, and Robert Shaw. Not the terrible sequel, which I don’t ever want to think about again. Ever. We’ve been using the chapters of The Sting to illustrate what makes up a good talk, one that w...

INTRODUCTION Arabic-speaking migrants have constituted a growing population in recent years. This entails major challenges to ensure good communication in the healthcare encounter in order to provide individual and holistic healthcare. One of the solutions to ensure good communication between patient and healthcare staff who do not share the same language is to use a professional interpreter. T...

We report the first demonstration of an intracavity side-pumped Ho:YAG slab laser, delivering 13W at 2.09μm and discuss the advantages of this scheme as an approach for power scaling.

In this talk, we will describe a dynamical mechanism called transverse ho-moclinic intersection. On one hand, the discovery of this mechanism proved to be very costly for a great mathematician. On the other hand, this mechanism provides the key idea to design very low energy paths that have been used to save millions of dollars for international spaceflight programs. We prove that, generically,...

BACKGROUND Evidence-based medicine (EBM) is maturing from its early focus on epidemiology to embrace a wider range of disciplines and methodologies. At the heart of EBM is the patient, whose informed choices have long been recognised as paramount. However, good evidence-based care is more than choices. DISCUSSION We discuss six potential 'biases' in EBM that may inadvertently devalue the pati...

The HO(aq) ion participates in myriad aqueous phase chemical processes of biological and chemical interest. A molecularly valid description of its hydration state, currently poorly understood, is a natural prerequisite to modeling chemical transformations involving HO(aq). Here it is shown that the statistical mechanical quasichemical theory of solutions predicts that HO · [H2O]3 − is the domin...