Synthetic hydroxyapatite (HA) has been widely used and developed as the material for bone substitute in medical applications. The addition of zirconia is needed to improve the strength of hydroxyapatite as the bone substitute. One of the drawbacks in the use of biomedical materials is the occurrence of biomaterial-centred infections. The recent method of limiting the presence of microorganism o...

We develop an algorithm for the linear ordering problem, which has a large number of applications such as triangulation of input-output matrices, minimizing total weighted completion time in one-machine scheduling, and aggregation of individual preferences. The algorithm is based on the Lagrangian relaxation of a binary integer linear programming formulation of the problem. Since the number of ...

We study the connectivity of random d-regular graphs which are recursively generated by an algorithm motivated by a peer to peer network. We show that these graphs are asymptotically almost surely d-connected for any even constant d ≥ 4.

purpose: to compare complications and motility of hydroxyapatite versus medpor ocular implants after enucleation at ahvaz imam hospital (from jan 2010 to jun 2011). methods: in a clinical trial, 50 patients scheduled for enucleation were randomly divided in two groups of 25 patients. group 1 underwent enucleation + hydroxyapatite (ha) and group 2 underwent enucleation + medor implant. all patie...

purpose: to evaluate exposure rate following wrapping hydroxyapatite implant in mersilene mesh and donor sclera. methods: in a prospective comparative interventional case-series 60 consecutive patients underwent primary hydroxyapatite orbital implant wrapped in mersilene mesh or donor sclera. results: thirty patients (21 male and 10 female) underwent implantation with mersilene mesh and 30 pati...

bone like hydroxyapatite (nhap) was synthesized via an in situ biomimetic process in presence of wheat starch. the effect of polymer concentration alteration on the final structure of nhap was investigated. formation of the nhap at room temperature was confirmed by x-ray diffraction (xrd) and fourier transform infrared spectroscopy (ft-ir). size and morphology of the nhap samples were character...

Introduction: Hydroxyapatite nanoparticles inhibit the growth of various cancer cells. The inhibitory effect of these nanoparticles on breast cancer cells of mcf7 has also been reported. However, no studies have been done on the effect of the hydroxyapatite nanoparticles on the radiation sensitivities of the MCF7 cell Line. Our goal in this study is to investigate the effect of...

Hydroxyapatite orbital implants are widely used in the treatment of post-nucleation socket syndrome. The porous hydroxyapatite serves as a matrix for vascular tissue ingrowth. We investigate the degree of fibro-vascular tissue integration and the presence of osteogenesis within the porous hydroxyapatite part of the orbital implants. For comprehensive imaging, all implants were prepared using a ...