Abstract Novel organomagnesium crown ether molecules have been computationally characterized using density functional theory (DFT). Monomer units of MgC 6 are used as building blocks. Isomers H 2 extensively explored both DFT and coupled‐cluster methods in the past by some us. It had concluded that seven‐membered ring isomer, 1‐magnesacyclohept‐4‐en‐2,6‐diyne, was thermodynamically most stable ...

The photochemical behaviors of a series of 9-phenanthreneacetamide (PA) derivatives were investigated using UV, fluorescence, and (1)H-NMR spectroscopy in acetonitrile solutions. To apply the electron transfer (ET) action of PA as a detecting moiety of chemosensors, 4'-(9-phenanthreneacetamido)-benzo-15-crown-5 (1) and 3'-methyl-4'-(9-phenanthreneacetamido)-benzo-15-crown-5 (2) were synthesized...

OBJECTIVES Fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (CHS). The purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (FPDs) with excessive crown height, fabricated from three different materials. MATE...

In response to the informative article written by Dr. Omar El-Mowafy in the December 2007/January 2008 issue of the JCDA,1 I would like to offer some comments from a different perspective and with different conclusions. The article suggested that the tissue of a 25-year-old, otherwise healthy gentleman was inf lamed around porcelain-fused-to-metal (PFM) crowns on both maxillary central incisors...

A simple, economical, and sensitive capillary electrophoresis (CE) method integrated with capacitively coupled contactless conductivity detection was developed for the determination of metal ions such as K+, Na+, Mg2+, Sr2+, Ca2+ in drinking water. 18-Crown-6 ether and Hexadecyltrimethylammonium Bromide (CTAB) were employed as complexing reagents. The effects of electrolyte additives, citric ac...

This cross-sectional study clinically assesses the tightness of proximal contact points of fixed dental prosthesis with natural teeth. Sixty nine (69) patients visiting the Department of Prosthodontics, Armed Forces Institute of Dentists (AFID), Rawalpindi, were included. The crowns, as a single unit or terminal abutment of bridge, prepared and fabricated at the same institute were included. A ...

The presence of heavy metals released from industrial activities into water streams is an ever-growing challenge to ensuring a safe and clean aquatic environment. Detection and determination of the levels of these heavy metals in wastewater is an important step before any measures can be taken. In this study we report on a fluorescent sensing probe based on a naphthyl azo dye modified dibenzo-1...