We give a genus 3 Heegaard diagram H of the real projective space P3, which has no waves and pairs of complementary handles. So Negami’s result that every genus 2 Heegaard diagram of P3 is reducible cannot be extended to Heegaard diagrams of P3 with genus 3.

In the infinite mass limit for a heavy quark its spin decouples from the QCD dynamics, which leads to the heavy-quark spin symmetry. After a short discussion of spin symmetry some applications are considered. Contribution to the Crakow Epiphany Conference on Spin Effects in Particle Physics January 9–11, 1998, Crakow, Poland.

introduction: vertical root fracture inevitably leads to tooth extraction. thus, root filling with obturating materials and sealers that can reinforce the tooth would be an ideal way to reduce fracture in root treated teeth. this study aimed to assess the fracture resistance of roots following the application of different sealers including epiphany, iroot sealer and ah-plus. methods and materia...

Background: The objective of three-dimensional obturation is to completely seal the canal system from any bacterial ingress from the oral cavity and periradicular tissues. The aim of the study to compare the push-out bond strength of the smart seal C-point obturating system with epiphany resilon obturation system and the gold standard gutta-percha/AH plus system. Materials and Methods: Thirty e...

the aim of this study was to compare the apical seal of curved canals obturated with resilon/epiphany with gutta-percha/ah plus.thirty-four extracted human mandibular molars with 25-40 degree canal curvature of the mesial root were selected for this study. after preparation, the mesiobuccal canals were obturated with gutta-percha and ah- plus sealer (group g) or resilon and epiphany sealer (gro...

objective: root canal obturation is an important step in endodontic therapy aiming at achieving a complete three-dimensional seal of the canal and preventing microleakage, reentry or growth of microorganisms in the root canal system. several techniques and materials are available for root canal filling. achieving an apical seal is among the most important characteristics of filling materials. t...

The Subventricular Zone Neural Progenitor Cell Hypothesis in Glioblastoma: Epiphany, Trojan Horse, or Cheshire Fact? Iris C. Gibbs, MD,* Daphne Haas-Kogan, MD,y Stephanie Terezakis, MD,z and Brian D. Kavanagh, MD, MPHx Departments of Radiation Oncology, *Stanford University, Palo Alto, California; yUniversity of California, San Francisco; zJohns Hopkins University, Baltimore, Maryland; and xUni...

BACKGROUND AND OBJECTIVE To date, many different materials have been proposed for root canal fillings, but gutta-percha (used with various types of sealers) has remained the material of choice for over a century. A new root canal obturation system, the Epiphany endodontic obturation system, has been developed to replace gutta-percha and traditional sealers for root canal obturation. The purpose...