Introduction The main function of acrylic bone cement is to transfer loads from the prosthesis to the cancellous bone or increase the load carrying capacity of the surgical prosthesis. If the imposed stresses are greater than the load carrying capability, then cement fracture may occur resulting in failure of the joint replacement. The fracture of the cement mantle and subsequent premature loos...

A retrospective review of 72 cases of Charnley low friction arthroplasty revised for stem loosening, has identified a number of "at risk" factors. These were: previous hip surgery and, in radiographs taken at one year, demarcation of the distal cement and fracture of the cement near the tip of the stem. Separation of the back of the stem from the cement, as an isolated feature, was not consider...

The high-shear colloidal mixer is generally recognised as the most efficient method of mixing cement based grouts. Only recently however has this technology been applied to the production of cemented rockfill (CRF) for use in underground mines in North America. Traditionally, paddle type mixers have been used to produce the cement based slurries required for the preparation of CRF. While consid...

AIMS A fracture of the hip is the most common serious orthopaedic injury, and surgical site infection (SSI) is one of the most significant complications, resulting in increased mortality, prolonged hospital stay and often the need for further surgery. Our aim was to determine whether high dose dual antibiotic impregnated bone cement decreases the rate of infection. PATIENTS AND METHODS A quas...

Despite the well-known economical, technical, and environmental benefits achieved by the use of the blended cements, its production has been slow to develop in the U.S.. The major aim of this project was to establish blended cement production technology through laboratory investigations. This involved production and evaluation of blended cement in the laboratory, in order to define materials, p...

In the current investigation is presented prospective substitution of cement and fine aggregates with slag material (Alccofine 1203) coal bottom ash, respectively. The was carried out in two steps, viz. Phase I II. I, a control mix designed basic ingredients concrete, then were partially replaced five percentages (10%, 20%, 30%, 40% 50%) ash (CBA). To improve characteristics concrete mixtures, ...

The placement of intermediary cement bases under deep preparations for amalgam restorations is a recommended procedure in restorative dentistry. The base is of low thermal conductivity and thus protects the pulp from thermal shock.1 Bases should also possess sufficient strength to withstand the forces of condensation and mastication transmitted through the amalgam restoration.2'3 The effect of ...

This study assesses the ballistic impact strength of thin plates made ultra-high-performance concrete (UHPC) with low cement content (250 kg/m3) and volumes 80% steel 20% polypropylene (PP) hybrid fibers. The were prepared thicknesses 30, 50, 70 mm fiber volume ratios 1.5% 3.0%. Compressive strength, flexural tensile residual determined using experimental methods. Test results showed that regar...

Waste incineration still seems to be an essential technology in the concept of integrated waste management. However, the desirable quantity of waste incineration residue needs to be as low as possible. Therefore, related optimization of two-stage waste incineration technology has been performed with the main goal of producing lower amounts of boiler ash, fly ash and flue gas-treatment residue, ...

The stem-cement interface experiences fretting wear in vivo due to low-amplitude oscillatory micromotion under physiological loading, as a consequence it is considered to play an important part in the overall wear of cemented total hip replacement. Despite its potential significance, in-vitro simulation to reproduce fretting wear has seldom been attempted and even then with only limited success...