Background: preparation of root canals is an important step in root canal treatment. Mechanical instrumentation of root canals cause an irregular layer of debris, known as the smear layer. As a result, several studies reported that preferring the removal of the smear layer. Objective: To study the influence of the energy (100 mJ) of Erbium, Chromium: Yttrium Scandium Gallium Garnet (Er,Cr:YSGG) laser at short pulse duration (60 μs) on smear layer removal of apical third after using Photon induced photoacoustic streaming technique. Materials and methods: Eighteen straight single-rooted mandibular premolars were used. The roots length were uniform to 14mm from the anatomic apex and instrumented using Protaper Gold Rotary NiTi file system to size 40 taper 0.06. Er,Cr:YSGG pulsed laser (waterlase iplus Biolase, CA, USA) 2780 nm was used at short pulse duration (60 μs, 5 Hz ,air and water off) delivered by MD/iplus Glass Tips (MZ6) 600 μm in diameter, length=6 mm, calibration factor= 1.00. Ultrasonic activator ENDO1 (Guilin Woodpecker Medical Instrument Co., Ltd.china) was used with Ultrasonic activator tip ED98 (25#, 2% taper, 18.5mm) (Guilin Woodpecker Medical Instrument Co., Ltd.china). The samples were arbitrarily divided into three groups (n=6) and used as follows: (A) conventional irrigation with 5 ml of 17 % EDTA, (B) passive ultrasonic irrigation with 5 ml of 17 % EDTA, (C) Er,Cr:YSGG induced photoacoustic streaming with 5 ml of 17 % EDTA. After final irrigation with normal saline and drying, the roots were painted with nail varnish externally, and 2% methylene blue dye injected into canal until the canal filled with dye. The tooth was splitted at the fourth millimeters from root apex with a diamond disc representing the apical third. Picture was taken by Professional Digital SLR camera (Nikon D7100, Nikon Corporation, Thailand) with 40X magnification. The dye penetration was measured by using analytical software (measure picture CAD-KAS Kessler Germany). ANOVA test was used to analyse repeated measure mean between tested concentration (5.25% NaOCL, 17% EDTA) and control. Data was expressed as mean±SD. LSD (Least Significant Difference) test was used to calculate the significant differences between tested mean. Results: The mean values of the percentage of dye penetration area in two experimental groups was higher than the control group, as the follow (20.79±1.15control, 34.5453±0.45 ultrasonic group, 85.9804±2.69 Er,Cr.YSGG+17%EDTA at 0.5 W). The Percentage of dye penetration in Er,Cr:YSGG laser induced photoacoustic streaming with 17% EDTA was significantly high (P value 0.001), followed by ultrasonic activated group, while control group result in less Percentage of dye penetration than both study groups. Conclusion: In this study, we concluded that Er,Cr:YSGG pulsed laser (0.5 W,5 Hz , air and water off) at short pulse duration (60 μs) with 17% EDTA using PIPS technique for activation of irrigant in endodontic treatment give better result than ultrasonic activation in smear layer removal
لقد مثلت عملية التحول من النظام الشمولي الى مشروع اقامة نظام جديد ومغاير نقلة نوعية شهده المجتمع العراقي بعد 9/4/ 2003 القت بظلالها على مختلف الاصعدة السياسية والاقتصادية والاجتماعية، ولعل من بين ابرز تلك التحولات ذلك الذي تبلور على حول مفهوم الهوية الوطنية واعادة تشكيلها من خلال صياغة جديدة لمفهوم المواطنة الذي يفترض ان تكون القاعدة الراسخة التي يتأسس عليها المشروع الوطني الجديد الرامي الى إقامة او إعادة تأسي
... Show Moreلقد مثلت عملية التحول من النظام الشمولي الى مشروع اقامة نظام جديد ومغاير نقلة نوعية شهده المجتمع العراقي بعد 9/4/ 2003 القت بظلالها على مختلف الاصعدة السياسية والاقتصادية والاجتماعية، ولعل من بين ابرز تلك التحولات ذلك الذي تبلور على حول مفهوم الهوية الوطنية واعادة تشكيلها من خلال صياغة جديدة لمفهوم المواطنة الذي يفترض ان تكون القاعدة الراسخة التي يتأسس عليها المشروع الوطني الجديد الرامي الى إقامة او إعادة تأسي
... Show Moreﺣﻘﻮق اﻻﻧﺴﺎن ﺣﻘﻮق ﻣﺮﺗﺒﻄﺔ ﺑﺤﺮﯾﺔ وﻛﺮاﻣﺔ اﻻﻧﺴﺎن واﻟﺘﻲ ﺗﻀﻤﻨﮭﺎ اﻟﺴﻠﻄﺎت اﻟﻌﺎﻣﺔ وﺟﺎءت اﻟﻤﻮاﺛﯿﻖ اﻟﺪوﻟﯿﺔ واﻻﻗﻠﯿﻤﯿﺔ واﻟﺪﺳﺎﺗﯿﺮ ﻟﻠﺘﺄﻛﯿﺪ ﻋﻠﻰ اھﻤﯿﺔ ھﺬا اﻟﻤﻮﺿﻮع وﺑﻘﺪر ﺗﻌﻠﻖ اﻟﻤﻮﺿﻮع ﻓﻲ اﻟﻤﺮأة اﻟﻌﺮﺑﯿﺔ ﻋﺎﻣﺔ اﻟﻌﺮاﻗﯿﺔ ﺑﺸﻜﻞ ﺧﺎص، ان ﺣﻘﻮﻗﮭﺎ ﺗﺸﮭﺪ ﺗﻘﺪﻣﺎً ﻣﻠﺤﻮﻇﺎً ﻓﻲ اﻟﺴﻨﻮات اﻻﺧﯿﺮة ﻧﺘﯿﺠﺔ ﺛﻮرات اﻟﻮﻋﻲ اﻟﺤﺎﺻﻠﺔ ﻓﻲ اﻟﻮﻃﻦ اﻟﻌﺮﺑﻲ، اذ ﺷ
... Show MoreObjective (s): to assess nurses' practices regarding discharge planning post-cardiac surgery and to find out the relationship between nurse practices and demographic characteristic (age, gander, level of education, years of experiences, and years of experiences in surgical ward).
Methodology: A descriptive study was carried out at cardiac centers and hospitals in Baghdad (Ibn Al- Bitar specialized center for cardiac surgery; Iraqi center for heart disease and Ibn al Nafees hospital). For the period of 6th February 2017 up to 1st of June 2018. A non-probability (purposive) sample of (58) nurses (male & female) who were working in surgical wards. The data was collected, by using of a questionnaire, which consists of two parts, part
Euphemisms are advantageous in people’s social life by turning sensitive into a more acceptable ones so that resentful feelings and embarrassment can be avoided. This study investigates the ability of Iraqi English learners in using euphemistic expressions, meanwhile, raising their awareness and the faculty members in English teaching faculties regarding the relevance of discussing the topics that demand euphemisation. This study comprised three stages: initial test, explicit instruction with activities, and a final test for the students’ development in this domain. A test has been distributed among 50 respondents, who are at the fourth year of their undergraduate study at the University of Babylon/ College of Basic Education. The lo
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This study aims to identify both the importance of using (LinkedIn) and its drawbacks for researchers and specialists in the field of information and knowledge technologies. The study relied mainly on the statistical method (analytical method) from the collection of data tools (questionnaire) that was distributed electronically (Google Forms) to the sample community of (55) instructors. The feedback received illustrates that (46) instructors among those who participated in the questionnaire subscribed to (LinkedIn) and the rest did not. Their data was analyzed statistically, and the general arithmetic mean and the hypothetical mean was extracted for them to achieve the objectives of the study and prove their hypotheses. The site positively
... Show MoreThis paper aims to review the intellectual to the most important thought leaders administrative and strategic They both (Henry Fayol and Michelle Porter), who forward a lot of ideas that have helped countries in the advancement and progress their economies , has been drawing literature theoretical common border in Contributions ( Fayol ) philosophical and between applications ( Porter ), which reversed strategies of the three ( the leadership of the cost, differentiation, and focus ), so browse search how to apply and use the principles of Fayol in the implementation of strategies competitiveness of Porter, and stems from a problem ( ( to what extent a reflection of the principles ( Fayol) fourteen strategies (Porter ) competitiv
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Most companies use social media data for business. Sentiment analysis automatically gathers analyses and summarizes this type of data. Managing unstructured social media data is difficult. Noisy data is a challenge to sentiment analysis. Since over 50% of the sentiment analysis process is data pre-processing, processing big social media data is challenging too. If pre-processing is carried out correctly, data accuracy may improve. Also, sentiment analysis workflow is highly dependent. Because no pre-processing technique works well in all situations or with all data sources, choosing the most important ones is crucial. Prioritization is an excellent technique for choosing the most important ones. As one of many Multi-Criteria Decision Mak
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