the effects of closely adapting a prefabricated fiber to the post space remain unknown. the purpose of this study was to quantify the microleakages of a custom adapted fiber-reinforced post, a prefabricated quartz fiber post and a cast post using nondestructive methods.sixty-five extracted human premolars were endodontically treated and randomly divided into three groups (n=15), which were rest...

Infrared photodissociation (IRPD) spectra of [H(2)O x (CO(2))(n)](+) and [CH(3)OH x (CO(2))(n)](+) (n=1-7) are measured in the 1100-3800 cm(-1) region. At the same time, the solvation characteristics in the clusters are investigated theoretically; the geometry optimization and the vibrational analysis are carried out for the [H(2)O x (CO(2))(n)](+) (n=1-4) and the [CH(3)OH x (CO(2))(n)](+) (n=1...

background: restoration of anterior primary teeth with severe caries lesion is a big challenge. the aim of this study was to compare the fracture resistance of three types of post, including composite resin, customized quartz fi ber and prefabricated glass fi ber in restoration of severely damaged primary anterior teeth. materials and methods: sixty extracted human primary maxillary incisors we...

STATEMENT OF PROBLEM Minimal evidence is available concerning the appropriate thickness of each layer in bilayered ceramic systems. PURPOSE The purpose of this in vitro study was to examine the effect of core-veneer thickness ratios on the fatigue strength of a bonded bilayered ceramic system. MATERIAL AND METHODS Specimens of Ivoclar Porcelain System (IPS) e.max lithium disilicate were fab...

The Live Sequence Charts (LSC) language is an extension of the well-known Message Sequence Charts by means to specify liveness and to distinguish possible runs of a system from protocols that all runs should adhere to. This paper studies the expressive power of the automaton-based LSC semantics [11] in terms of temporal logic. The main result is that bonded core LSCs have an exact characterisat...

The local adsorption structure of methylthiolate in the ordered Au(111)-(sqrt[3]xsqrt[3])R30 degrees phase has been investigated using core-level-shift measurements of the surface and bulk components of the Au 4f(7/2) photoelectron binding energy. The amplitude ratio of the core-level-shift components associated with surface Au atoms that are, and are not, bonded to the thiolate is found to be ...