Background: The marginal fit is the most characteristic that closely related to the longevity or success of a restoration, which is absolutely affected by the fabrication technique. The objective of present in vitro study was to evaluate the effect of four different CAD/CAM systems on the marginal fit of lithiµm disilicate all ceramic crowns. Materials and Methods: Adentoform tooth of a right mandibular first molar was prepared to receive all ceramic crown restoration with deep chamfer finishing line (1mm) and axial reduction convergence angle of 6 degree, dentoform model duplicated to have Nickel-Chromiµm master die. Thirty two stone dies produce from master die and distributed randomly in to four groups (8 dies for each group) accor

There is no doubt that Agricultural Policy is the main responsible for the degrading in Agricultural sector in Iraq during the period 2003-2013, and that was very clear from magnitude of indicators because of little sharing of each of agricultural product in GDP because it was (9.38%) in average during the study period and the annual changing of it was negative (-5.82%), and there is increasing in deficit of trade balance in Agriculture during the study period about (4185.73) million US$, and the percentage of agricultural exports from total exports was (0.14%) in average only. The foreign trade policy in Agricultural products also cannot determine map of Revealed Comparative Advantage (RCA) of Agricultural products and crops. The study sh

Background: White spot lesion is the first visible sign of dental caries that is characterized by demineralized lesion underneath an intact surface. Several studies demonstrated that they could be treated using noninvasive techniques like the use of fluoride or casein phospho-peptide and amorphous calcium phosphate. Improvement in aesthetic outcomes by covering the demineralized enamel is one of the advantages of the use of resin infiltration and opal-ustre microabrasion, which are two new techniques that had been used for treatment of white spot lesion. The purpose of this study was to evaluate the impact of resin infiltration and microabrasion in the microhardness of the artificial white spot lesions at various depths. Material and method

This study aimed to assess orthodontic postgraduate students’ use of social media during the COVID-19 lockdown. Ninety-four postgraduate students (67 master’s students and 27 doctoral students) were enrolled in the study and asked to fill in an online questionnaire by answering questions regarding their use of social media during the COVID-19 lockdown. The frequency distributions and percentages were calculated using SPSS software. The results showed that 99% of the students used social media. The most frequently used type of social media was Facebook, 94%, followed by YouTube, 78%, and Instagram, 65%, while Twitter and Linkedin were used less, and no one used Blogger. About 63% of the students used elements of social media to l

        This paper concerns with openness concept in contemporary learning environment, which ranges from physical characters to its relation with learning efficiency and its output. Previous literatures differ to clear the effect of openness on the engagement between learner within themselves, and with this kind of spaces. Engagement means: active participation, the ability of making dialogue, self-reflection and the ability to explore and communicate with them and
within learning space. Research roblem was: The lack of knowledge about the effect of Openness on learner engagement with learning spaces. The two concepts were applied on three types of learning spaces in the Department of the Architectu

Objecte The study aims to test the effect of using the appropriate quantitative method of demand forecasting in improving the performance of supply chain of the aviation fuel product ( The study sample), One of the products of the Doura refinery (The study site), By testing a set of quantitative methods of demand forecasting using forecasting error measurements, and choosing the least faulty, most accurate and reliable method and adept it in the building  chain.

Is the study of problem through a starting with the fol

  The majority of the arts share a goal directed at employing art works for the purpose of conveying the intellectual and symbolic connotations in order to work on a directed message and to achieve expression and aesthetic, and highlights the cinematographic mediator who shares with the other media in the use of intellectual properties through its tools and works. Consciousness and establishment of multiple visions with different views to reveal the intellectual, aesthetic and expressive devices located opposite the advertiser to perform functions with goals that intellectually deduce, insights and ideas emerging within the general context of the drama narrative and highlights among the discourse operators the cinematographer, And t

The Arab Muslime Paid agreat attention to the Islamic East, especially after their conquest to the Parisian lands, they went forword to continue their conquest till Transoxiara (the lands beyond the river). The research is included the Islamic efforts to conquest (Transoxiara) , They needed mouch time for more than 40 years to conquest it. To sattle their steps in it they used its leading figures to prevent the breaking of the agreement held between them as they were known for doing this before more than once. The main idea of this research is releated to study that history in the Arabic resources.

  اﻟﺴﯿﺎق ﻓﻲ َأدرك ﻋﻠﻤﺎؤﻧﺎ اﻷواﺋﻞ أﺛﺮَ اﻟﺴﯿﺎق ﻗﺮﯾﻨﺔ ﻣﻦ اﻟﻘﺮاﺋﻦ اﻟﻤﺆﺛﺮة ﻓﻲ ﻣﻌﻨﻰ اﻟﺨﻄﺎب، وﻗﺪ ﻠﻤﺔ ّ وﺗﻤﺜﻞ ﻟﺪﯾﮭﻢ ﻓﻲ ﺟﺎﻧﺒﯿﻦ :اﻷول اﻟﺴﯿﺎق اﻟﻠﻐﻮي اﻟﺬي ﯾﻘﻮم ﻋﻠﻰ أﺳﺎس أن اﻟﻜ ،ﺗﻮﺟﯿﮫ اﻟﻤﻌﻨﻰ وﺗﺤﺪﯾﺪه ِﻜﻮن ﺣُﺴﻨﮭﺎ ورداءﺗﮭﺎ ﻓﻲ ﻧﻈﻤﮭﺎ، ّ ﻻ ﻗﯿﻤﺔ ﻟﮭﺎ ﻓﻲ ﺣﺎل إﻓﺮادھﺎ، وإﻧﻤﺎ ﯾ واﻟﺜﺎﻧﻲ اﻟﺴﯿﺎق اﻟﺤﺎﻟﻲ، وذﻟﻚ ُ ُ ﺑﺮﺑﻄﮭﻢ اﻟﺼﯿﺎﻏﺔ اﻟﻠﻐﻮﯾﺔ ﺑﺎ