introduction: this cross-sectional survey determined the dental prevalence of apical periodontitis (ap) in selected iranian population, and evaluated the influence of the quality of root canal treatment (rct) and their coronal restorations (cr) on the periapical status. materials and methods: a total of 1064 panoramic radiographies were evaluated by two observers during 2009. the quality of rct...

A relationship between multiple sclerosis (MS) and dental silver-mercury fillings has been suggested by some investigators, but never proven. This study documents objective biochemical changes following the removal of these fillings along with other dental materials, utilizing a new health care model of multidisciplinary planning and treatment. The dramatic changes in photolabeling of cerebrosp...

We associate with a moon polyominoes a charge function C :M→ {±1} such that every cell of the polyomino is either positive or negative. The charge function induces naturally a sign on the northeast and southeast chains of length 2 in 01-fillings of the moon polyomino. We prove that the joint distribution of the numbers of positive chains and negative chains is symmetric and independent of the c...

Suppose that M is a fibered three-manifold whose fiber is a surface of positive genus with one boundary component. Assume that M is not a semi-bundle. We show that infinitely many fillings of M along ∂M are virtually Haken. Combined with a result of Cooper and Long, this gives the corollary that infinitely many fillings of the complement of any non-trivial knot in a Z-homology three-sphere are ...

introduction: the aim of this study was to evaluate the effects of training duration and case difficulty on the radiographic quality of root canal fillings performed by dental students in saudi arabia. methods and materials: a longitudinal cohort study was conducted at king saud university. root canal treatments performed by 55 dental students from 2012-2014 were included in the study. each stu...

In the absence of a confining potential, the boson-Hubbard model exhibits a superfluid to Mott insulator quantum phase transition at commensurate fillings and strong coupling. We use quantum Monte Carlo simulations to study the ground state of the one-dimensional bosonic Hubbard model in a trap. Some, but not all, aspects of the Mott insulating phase persist. Mott behavior occurs for a continuo...

In this paper we give simple bijective proofs that the number of fillings of layer polyominoes with no northeast chains is the same as the number with no southeast chains. We consider 01fillings and N-fillings, and prove the results for both strong chains where the smallest rectangle containing the chain is also in the polyomino, and for regular chains where only the corners of the smallest rec...