This study evaluated the reliability of implant-supported crowns repaired with resin composites. Fifty-four titanium abutments were divided in three groups (n = 18 each) to support resin nanoceramic molar crowns, as follows: (LU) (Lava Ultimate, 3M ESPE); LU repaired with either a direct or an indirect resin composite. Samples were subjected to mouth-motion accelerated-life testing in water (n ...

Epoxy–nanoceramic composites of BiVO4 (BVO), LaNbO4 (LNO), and Li6Mg7Ti3O16 (LMT) were prepared using the solvent mixing method. The ceramic nano-fillers volume fractions (5, 8, 10, 12%). X-ray diffraction (XRD) Atomic Force Microscopy (AFM) used to investigate crystal structure size distribution nanoceramics, respectively. dielectric constant loss tangent measured in frequency range (4-8) GHz....

Hydrophobic colloidal Systems, consisting of one phase finely dispersed in another and therefore having an extensive (high energy) interfacial region, are intrinsically unstable. Over a period of time, the suspended particles or droplets in a dispersion will tend to coalesce or adhere upon collision with each other or with another surface thereby reducing the interfacial area and, with it, the ...

Polymer–derived ceramics (PDCs) constituted from silicon, carbon, nitrogen and oxygen embody not only remarkable resistance to creep, thermal shock and oxidation at very high temperatures, but also functional properties such as semiconductivity which extends up to 1350C. In this report we describe the extraordinary sensitivity of the electrical resistance of the PDCs to hydrogen, at temperature...

Objective: the aim of this study was to compare mechanical behavior different ceramics when used in thinvertical preparations versus traditional horizontal preparation. Material and Methods: two stainless-steel dieswere milled simulate a minimally invasive vertical preparation (VP) preparation(HP) for an all-ceramic crown maxillary first premolar. The dies were duplicated using epoxyresin. Eigh...

STATEMENT OF PROBLEM In order to increase the performance of glass ionomer cement, it is reinforced with metal powders, short fibers, bioceramics and other materials. Fluoroapatite (Ca10(PO4)6F2) is found in dental enamel and is usually used in dental materials due to its good chemical and physical properties. OBJECTIVES In this study, the effects of the addition of synthesized fluoroapatite ...