The title compound, (C(4)H(5)N(2)O)(5)[Cd(3)Cl(11)], was obtained from the reaction of 2-hydroxy-pyrimidine hydro-chloride and cadmium(II) chloride in concentrated HCl solution. The crystal structure consists of planar 2-oxo-1,2-dihydro-pyrimidin-3-ium cations with both N atoms protonated and the O atom unprotonated, and a complex trinuclear [Cd(3)Cl(11)](5-) anion of approximately D(3h) symmet...

In the title coordination polymer, {[Cd(2)(C(10)H(9)O(5))(2)(C(10)H(8)N(2))(2)(C(3)H(7)NO)(2)(H(2)O)(2)](NO(3))(2)}(n), the 3-(4-carb-oxy-phen-oxy)propionate monoanion O,O'-chelates to a Cd(II) cation through the aliphatic carboxyl-ate end. One of these O atoms is also connected to the metal cation from an inversion-related metal atom. The five O atoms bonded to the metal centre form a penta-go...

introduction: in cases of severe hard tissue loss, 2 mm circumferential ferrule is difficult to achieve. so in these cases we should use different ferrule designs. this in vitro study investigated the effect of different ferrule designs on the fracture resistance of teeth restored with bonded post and cores. materials and methods: forty freshly-extracted central incisors were endodontically tre...

Reaction of copper(II) thiocyanate with pyrimidine leads to the formation of the new ligand-rich 1:2 (1:2 = ratio metal salt to ligand) copper(II) compound [Cu(NCS)(2)(pyrimidine)(2)](n) (1). Its crystal structure was determined by X-ray single crystal investigations. It consists of linear polymeric chains, in which the Cu(2+) cations are mu-1,3 bridged by the thiocyanato anions. The pyrimidine...

The lap shear strength of chromic acid anodized, primed, Ti-6Al-4V alloy bonded with a high performance FM-5 polyimide adhesive has been investigated as a function of thermal treatment for selected times at various temperatures in air. The research findings indicate that the lap shear strength decreases with the increase in duration of the thermal treatment at constant temperature and with the ...

In the title compound, C(13)H(14)N(2), the dihedral angle between the aromatic rings is 48.1 (1)° and the bridging C-N-C bond angle is 127.24 (12)°. In the crystal, intermolecular N-H⋯N hydrogen bonding about a center of inversion generates a hydrogen-bonded dimer.

Z. Naturforsch. 56 b, 1163-1171 (2001); received July 17, 2001 Hypervalence, Phosphines, Lewis Acid-Base Adducts Lewis acid-base adducts between NMe3, tmeda (A^A^Af'-tetramethylethylenediamine), and 1.4-dimethylpiperazine as donors and PBr3 as acceptor have been prepared and structurally characterized. NMe3 and tmeda form 1:1 adducts (Me3 N)PBr3 (1) and (tmeda)PBr3 (2), re­ spectively, while 1,...

The aim of the study was to examine, in vitro, the effect of a vertical force on the debond force and deformation of two multi-stranded wires bonded to the lingual enamel of lower incisor teeth. Two different stainless steel wires were used, 0.016 × 0.022 inch (Bond-A-Braid® Reliance Orthodontic Products) and a three-stranded 0.0175 inch wire (Ortho Technology). An in vitro model was used to si...

The aim of this study was to evaluate the effects of bleaching and delayed bonding on the shear bond strengths of metal and ceramic brackets bonded with light and chemically cure composite resin to human enamel. One hundred and twenty extracted human premolar teeth were randomly divided into three groups of 40 each. The first two groups were bleached with 20 per cent carbamide peroxide (CP) at-...

The present study was performed to test the tendency for plaque and calculus build-up along the wire of different types of bonded orthodontic canine-to-canine retainers, whether the presence of such retainers causes any damage to the teeth involved, the failure rate of the retainers, and any changes in incisor alignment during a 3-year period of retention. The four test groups received either r...