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Article
EFFECTS OF AGING ON SOME ENZYME BIOCHEMICAL RELATED TO OXIDATION IN SERUM OF LOCAL COWS

Author: Alhtheal E. D.
Journal: Basrah Journal of Veterinary Research. مجلة البصرة للابحاث البيطرية ISSN: Print:18138497 E; 24108456 Year: 2017 Volume: 16 Issue: 2 Pages: 124-130
Publisher: Basrah University جامعة البصرة

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Abstract

The study was included 90 local cows from Al-Rashidea area which locates in the east ofBaghdad city, distributed into three groups, the smallest aged group (30) cows (1.5-2 ) years,middle aged group (30) cows (5.5-7) years and the older aged group (30) cows (11-13) years tostudy the effect progressing of age on some biochemical Criterias as indicators of oxidative stress.The results revealed that the antioxidant enzymes, Glutathione -S-transferase GST was increasedsignificantly (p<0.05) ) in middle -aged group And lower value in the older aging , it was noticedthat arylesterase enzyme gradually decreased significantly with age progress. The non enzymaticantioxidants such as Glutathione GSH revealed with the higher great value in the middle agegroup and the lower significant value in the aging compared with other groups. on the other handMalondialdehyde (MDA) and peroxy nitrite(ONOO-) level gradually increased with progressingof age, these events because of an increasing in production of free radicals and oxidative stressaccompanied with processing of age due to antioxidants depletion, which consider as a defenseline of body against the free radicals effects. It was concluded from this study that with agingprocesses have harm effects on blood components diagnosed by reducing in antioxidants levelsand increasing of Malondialdehyde and peroxy nitrite which consider as an indicators ofoxidative stress and this support the theory of free radicals and oxidative stress and their role inaging processes . Study the effect of aging on some biochemical parameters and antioxidant incow

Keywords

aging --- local cows --- Antioxidants


Article
The Effect of Artificial Accelerated Aging on The Color of Ceramic Veneers Cemented With Different Resin Cements (A Comparative In Vitro Study)

Authors: Shatha Kh. Hussain --- Inas I. Al-Rawi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 1 Pages: 39-46
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Color changes that are detectable to human eye can affect the esthetic appearance of ceramic veneers. The purpose of this study was to evaluate and compare the effect of artificial accelerated aging on the color of ceramic veneers cemented with different resin cements.Materials and Methods: Sixty discs were prepared with 0.5 mm thickness, 30 discs made from IPS e.max press (Ivoclar Vivadent) and 30 discs were made from VITA Enamic (VITA Zahnfabrik). The discs were cemented with three resin cements: Variolink Veneer MV 0 shade (Ivoclar Vivadent), Rely X veneer Translucent shade (3M ESPE) and NX3 Nexus Clear shade (Kerr Corporation) with 0.1 mm thickness. The spectrophotometer Easyshade Advance was used to measure the color parameters (Lightness, axis a* of chroma and axis b*of chroma) immediately after cementation, after 150 and 300 hours of aging. The specimens were subjected to artificial accelerated aging in Accelerated Weathering Tester. Color change greater than 3.3 was considered unacceptable. One-way ANOVA, paired t-tests and Bonferroni adjusted t-test were used for statistical analysis (p <0.05).Results: Artificial aging caused high significant color change in both ceramic types, but there were non-significant difference in color change among the three resin cements used. The color change was between1.997-14.8 after 150 hours and it was between 2.179-15.68 after 300 hours. The color change of e.max discs after aging were within acceptable limit<3.3 whereas Vita Enamic specimens had shown unacceptable color change >3.3 after aging.Conclusions: The majority of color change after aging related to veneering materials while resin cement have only slight effect on color change after aging. IPS e.max had shown an acceptable color change after aging, so it is suitable for fabrication of restorations in esthetic zone while Vita Enamic should not be used in esthetic zone since it has poor color stability according to the results of this study

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