Background and Aim: Fractured metal-ceramic restorations may be repaired with composite in some cases to postpone the fabrication of a new restoration. Knowledge about the bond strength can help predict the success rate of this treatment modality. The aim of this study was to assess the effect of two types of mechanical surface treatment of metal along with the use of different adhesive systems...

Aluminum based metal matrix composites (MMCs) have received considerable attention in the automotive, aerospace and nuclear industries. One of the main challenges using Al-based MMCs is the influence of the reinforcement particles on the corrosion resistance. In the present study, the corrosion behavior of Al-B₄C MMCs in a 3.5 wt.% NaCl solution were investigated using potentiodynamic polarizat...

objectives: color change of composite restorations is well known to dentists. however, the effect of commonly consumed drinks on discoloration of composite resins has yet to be determined. this study sought to assess the color change of a nanofilled (premise) and a flowable composite resin (premise flowable) following simulated consumption of tea, cola, iron drops and multivitamin syrup. materi...

a 45-year-old female patient with a diagnosis of ulcerative colitis complicated with composite lymphoma in the spleen and para-aortic lymph node presented with a one-month history of malaise, weakness and fatigue. only mesalamine kept ulcerative colitis under control. in physical examination, splenomegaly was revealed and pancytopenia was obtained from laboratory data. computed tomography scan ...

In this paper the effects of circular and elliptical cutout on the buckling behavior of a sixteen ply quasi-isotropic graphite/epoxy symmetrically laminated rectangular composite plate [0°/+45°/45°/90°]2s, subjected to various linearly varying in-plane compressive loads, numerically. Further, this paper addresses the effects of size of elliptical cutout, orientation of elliptical cutout, plate ...

Composite structures are already in use in secondary parts of the Douglas MD-11 and are planned to be used in the new MD-12X. Plans also exist for their use in primary and secondary structures on the Boeing 777. Douglas’ proposed MD-XX may also incorporate composite materials into primary structures such as the wings and tail. Use of composites in these structures offers weight savings, corrosi...

I n any quantum field theory of mat ter , in part icular in quarkand subquark models, bound states have to be treated. I n coupling theories corresponding bound state equations are derived b y the Gel l -Mann-Low procedure f rom the Greenfunction hierarchy. D u e to certain presuppositions neither the derivation of such generalized Bethe-Salpeter equations nor the normal izat ion of their ampli...

UNLABELLED Marginal integrity is one of the most crucial aspects involved in the clinical longevity of resin composite restorations. OBJECTIVE To analyze the marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS). MATERIAL AND METHODS A base composite (B) was produced with an organic matrix with UDMA/TEGDMA and 70 wt.% of bari...

background: the purpose of this in vitro study was to evaluate surface discoloration of three microhybrid composite resins (esthet•x hd, clearfi l ap-x, gradia direct) and fi ve nanohybrid composite resins (ceram•x, gc kalore, g-aenial, grandio, grandioso), after staining and bleaching procedures. materials and methods: the composite resins were polymerized with a curing light (celalux ii, voco...

background and aims. anterior esthetic restoration is challenging in pediatric dentistry, due to limited durability and poor retention of the restoration.this study assessed the effect of air abrasion on tensile failure load of composite class iii restorations using different preparation techniques. materials and methods. 100 extracted human anterior primary teeth were divided, based on the pre...