Teeth that have been endodontically treated often have little coronal tooth tissue remaining and, as such, require a post to retain the core and restoration, and need to be restored by crowns1,5,9. Metal posts are most commonly used due to their favourable physical properties and excellent biocompatibility4,8. With recent advances in ceramic technology, the all-ceramic crown has become more pop...

BACKGROUND Posts are used to enhance crown buildup in pulpless teeth with destructed crown portion. Different types of post are used in endodontically treated teeth. The aim of the present in vitro study was to evaluate fracture resistance of custom made, metal, glass fiber reinforced and carbon reinforced posts in endodontically treated teeth. MATERIALS AND METHODS An in vitro study was carr...

Proton induced X-ray emission spectroscopy (PIXE) has been used to determine the intensity of metals from crowns in human teeth. In order to measure elements distribution across the tooth section, proton beam (3 MeV) has been collimeted to provide a spatial resolution of 300 microns. The samples were selected according to the time of insertion of crowns and the kind of alloys they were made of....

STATEMENT OF PROBLEM Computer-aided design and computer-aided manufacturing (CAD/CAM) generated restorations are gaining popularity. However, limited clinical evidence is available for single-unit posterior CAD/CAM restorations fabricated with established and newer crown materials. PURPOSE The purpose of this clinical study was to assess the restoration quality of and gingival response to CAD...

A binucleating ligand has been prepared that contains an SCS pincer and three oxygen donor atoms in a partial crown ether loop. To enable metalation with Ni(0), a bromoarene precursor was used and resulted in the formation of a nickel-bromide complex in the SCS pincer portion of the ligand. Reaction of the nickel complex with a lithium salt yielded a heterobimetallic complex with bromide bridgi...

A solvent-free agostically propagated polymeric variant of a previously reported hydride-containing inverse crown molecule has been prepared, namely tetra2-diisopropylamidodi2-hydrido-dimagnesium(II)disodium(I), [Mg2Na2H2(C6H14N)4]. The asymmetric unit contains two crystallographically independent centrosymmetric molecules, each existing as a cationic eight-membered ring, with alternating metal...

A 46-year-old woman presented at the Department of Periodontology, University of Giessen, with mild chronic periodontitis and multiple gingival recessions in the upper jaw. Examination revealed poorly contoured metal ceramic restorations. Resulting soft tissue contours were also less than ideal from an aesthetic perspective. Oral hygiene instructions, scaling, and root planing were performed to...

Homoatomic polyanions have the basic capability for a bottom-up synthesis of nanostructured materials. Therefore, the chemistry and the structures of polyhedral nine-atom clusters of tetrel elements [E(9)](4-) is highlighted. The nine-atom Zintl ions are available in good quantities for E = Si-Pb as binary alkali metal (A) phases of the composition A(4)E(9) or A(12)E(17). Dissolution or extract...

We present the synthesis and characterization of (15-crown-5)BiI3 (1) ⋅ 0.5TIE (2), a halogen bonded adduct with tetraiodoethylene (TIE), typical bond donor. Single crystal structure analysis 2 suggests bonding interaction between crown ether complex TIE. The two compounds’ thermal, optical vibrational properties are investigated in comparison, differences pointing towards notable building bloc...