سؤدد عبدالله محمد الحلو

Background: The incorporation of rubber has not been entirely successful because it can have detrimental effects on the transverse Strength and hence the rigidity of the denture base. Materials and methods: Zirconium oxide nanoparticales were coated with a layer of trimethoxysilylpropylmethacrylate (TMSPM) before sonication in monomer (MMA) with the percentages 3% by weight then mixed with powder using conventional procedure.(100) samples were prepared and divided into five groups according to the test performed ,Each group consisted of 20 specimens and these were subdivided into 2 groupsGroup (A): control group (10 specimens of high impact acrylic resin without zirconium oxide) and Group (B):zirconium oxide group(10 specimens of high impact acrylic resin with 3% wt zirconium oxide).The tests conducted were impact strength, transverse strength, indentation hardness(shore D), surface roughness, water sorption and solubility. The results were statistically analyzed using Dunntt t-test. Results: Highly significant increase in impact strength and transverse strength occurred with the incorporation of 3% wt Zirconium oxide nanofiller. A highly significant increase in surface hardness, but the water sorption and solubility were significantly decreased with the addition of silanized (ZrO2) Nano particles compared with the control group.no significant statistical difference in surface roughness. Conclusions: The addition of silanized ZrO2 Nano particles to high impact heat cure acrylic resin material improves the impact strength, transverse strength and surface hardness of high-impact heat-cure acrylic resin at the same time this addition decreases water sorption and solubility. On the other hand there was no change in surface roughness with the addition of 3% wt of silanized ZrO2Nano particles.

Multiple attempts are made to develop coating layers on the implant surface to enhance ossiointegration and support implant functions. The mixture of chitosan with HA prepared by sol-gel process to make organic-inorganic hybrid composite that has the ability to make network with or without covalent bonds between components. In this study the immersion of titanium disc coated via sol-gel technique by nano-HA and chitosan in simulated body fluid. Materials and Method: Composite of nano hydroxy apatite/chitosan was prepared by sol-gel technique after preparation of two solutions of calcium nitride and phosphorous pentaoxide, then the magnetic stirrer was used for mixing of these solutions, then 3 mg of chitosan were added to the mixture and the mixture was stirrer for 15 hours to complete the mixing. Dip coated of titanium samples, then the samples were removed and dried by hot air oven, finally samples were sintered at 400 0 C for one hour. Coated samples were immersed in SBF in closed containers and placed in incubators at temperature 37 0 C for 30 days. Analysis of the surface include thickness measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX). The results of thickness measurement showed increase in thickness of the coated layer after immersion in SBF compared with thickness before immersion. The results of XRD showed the appearance of new peaks of HA, SEM showed there are additional accumulation of HA granules on the original coating layer. EDX test showed decreased in the concentration of the main ions component (Ca, Na, P, O and K) when compared with coated samples before immersion in SBF.

Dental implants can be made of various materials, and amongst them, titanium and titanium alloy were the materials of choice for dental implants for many years because of their biocompatibility. The two alloys have a high level of biocompatibility, a lower modulus of elasticity, and better corrosion resistance than other alloys. Thus, they are frequently utilized in biomedical applications and mostly replace stiff fabrics. The latest advances in a new strontium oxide–cp titanium composite alloy are the main topic of this research. With regard to biomedical applications, additions of strontium oxide were synthesized at three distinct weight percentages (2%, 4%, and 6% by wt%). Powder metallurgy was used to create the alloys, which were then sintered by heating the samples. The effects of adding strontium oxide were analyzed by utilizing measurements of the Brinell hardness, X-ray diffraction, porosity, diametral tensile strength, roughness, and wettability of the finished surfaces. The results show that adding more strontium oxide (gradually increasing the ratio from 2% SrO to a 6% addition) raised the roughness and porosity. However, the microhardness and diametral tensile strength were enhanced with an increase in the volume fraction of strontium oxide particles. In conclusion, the alloy that contained 6 wt% strontium oxide microparticles had reasonably high mechanical properties and might be regarded as suitable for use in dental and medical applications due to its high wettability or, in other words, its low contact angle. The Brinell testing results for the diametral tensile strength, microhardness, and porosity of the generated strontium oxide–cp titanium composite alloy demonstrate its high potential for usage as a biomaterial, particularly in dental applications.

high level of corrosion resistance, a high strength to weight ratio, and bio-compatibility, titanium as well as its alloys are extremely valuable today because of its enchanted qualities. With the use of sulfuric acid as electrolyte in the electrochemical circuit, the formation of anodic films and variations in aesthetic appearance regarding anodized titanium titanium-strontium oxide composite alloy surface are examined in the work that is currently being presented. This article concentrates on the most recent advances of a novel, commercially pure titanium-strontium oxide composite alloy that has been anodized. With regard to biomedical applications, strontium oxide was added in a particular quantity (6%) by wt.%. With the use of microhardness testing device, the impact of strontium oxide additions and anodic oxidation were examined. The findings show that strontium oxide additions increase microhardness. Additionally, titanium alloys with 6 wt.% strontium oxide microparticle additions that have been anodized exhibit no difference than those that have not been anodized. The produced strontium oxide-cp titanium composite alloy offers significant potential for use as a biomaterial, particularly in dental applications, as evidenced by high wettability and increased roughness.

الحمد لله رب العالمين والصلاه والسلام على محمد واله الطيبين الطاهرين اشكر الله واحمده على ما انعم عليه من نعمه اكمال دراستي للدكتوراه في اختصاص تعويضات الاسنان والوجه والفكين اشكر كل من ساعدني في هذه المسيره وجزاكم الله خير جزاء المحسنين