Polytechnic Journal https://journals.epu.edu.iq/index.php/polytechnic <p>Polytechnic Journal (Polytechnic J.) is a biannual scientific journal published by Erbil Polytechnic University, Erbil, KRG, Iraq. Polytechnic J. publishes original researches in all area of Pure Science, Applied Science, Technology and Engineering. Polytechnic J. is a Peer-Reviewed Open Access journal with Creative Commons Attribution Non-Commercial No Derivatives License 4.0 (CC BY-NC-ND 4.0). Polytechnic J. provides immediate, worldwide, barrier-free access to the full text of research articles without requiring a subscription to the journal. Polytechnic J. is available online on OJS-PKP platform since January 2019.</p> <p>p-ISSN: <a href="https://portal.issn.org/resource/ISSN/2313-5727">2313-5727</a> | e-ISSN: <a href="https://portal.issn.org/resource/ISSN/2707-7799">2707-7799</a> DOI: <a style="color: #009de5;" href="https://doi.org/10.25156/ptj">10.25156/ptj</a><br />____________________________________________________________________________________________________________________________</p> Erbil Polytechnic University en-US Polytechnic Journal 2313-5727 <p>Authors who publish with this journal agree to the following terms:<br>1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY-NC-ND 4.0] that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.<br>2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.<br>3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).</p> Numerical Study to Evaluate the Performance of Nonuniform Stepped Spillway Using ANSYS-CFX https://journals.epu.edu.iq/index.php/polytechnic/article/view/122 <p>The main features that attract hydraulic engineers for designing stepped spillways are their ability to lose a large portion of the flow energy and add or increase aeration to the flow naturally. Hence, smaller size stilling basin and no aeration device may require. This study aims to find the amount of energy dissipation rate and the location of inception point over non-uniform stepped spillway. The numerical 2D ANSYS-CFX code is applied to generate and run thirty-two models of different configurations using two different moderate slopes (1 V:2 H and 1 V:2.5 H) as most of the downstream slopes designed for moderate slope, and two different step heights (h<sub>s</sub>= 0.08 m and h<sub>s</sub>= 0.016 m) under skimming flow discharge for different (d<sub>c</sub>/h<sub>s</sub>) ranging from d<sub>c</sub>/h<sub>s</sub>= 1–2.2, in which dc is the critical flow deptho n the crest. The volume of fluid is implemented and the renormalized group of k-ɛ turbulence model is activated. The computational results demonstrated that the amount of energy dissipation increases with decreasing the flow discharge, chute slope, and step height. In addition, it is observed that the length of the inception point is directly proportional to the discharge and inversely proportional to both the chute slopes and step height. Moreover, for the design point of view, the results revealed that configuration B can be considered as the optimal one amongst the others examined herein.</p> Shawnm M. Saleh Sarhang M. Husain Copyright (c) 2020 Shawnm M. Saleh, Sarhang M. Husain https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 1 9 10.25156/ptj.v10n2y2020.pp1-9 Simulation of Mosul Dam Break Using Finite Volume Method https://journals.epu.edu.iq/index.php/polytechnic/article/view/153 <p>Mosul dam is an earth-fill embankment located north of Iraq on the Tigris River forming a reservoir with 11.11 km<sup>3</sup> water storage capacity which is the largest dam in the country. The dam is built on a rock bed foundation, in which the dissolution process is dynamic in the zone where gypsum and anhydrite layers present. During the construction development seepage locations were found in the dam foundation and the grouting process is in progress until now to control this problem. Therefore, the possibility of the Mosul dam break is highlighted by previous studies. In this research, a FORTRAN code based on the finite volume method is modified to solve the two-dimensional shallow water equations and simulating the Mosul dam break. The computational domain discretized using unstructured triangular mesh. The solver applied Harten lax van leer with contact (HLLC) wave approximate Riemann solver to calculate the cell interface fluxes, and the semi-implicit scheme employed to solve the friction source term. The numerical scheme applied to two benchmark test cases, and the results showed that the presented model was robust and accurate especially in handling wet/dry beds, mixed flow regimes, discontinuities, negative water depths, and complex topography. The results of this study demonstrate that flood waves may reach the center of Mosul city in &lt; 6 h and water depth may rise to 34 m after 7 h of Mosul dam breaking. Finally, the simulation results of the Mosul dam break were used to prepare an emergency action plan.</p> Ayhan H. Saleem Jowhar R. Mohammad Copyright (c) 2020 Ayhan H. Saleem, Jowhar R. Mohammad https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 10 20 10.25156/ptj.v10n2y2020.pp10-20 Effect of Straw Throwing Method and Some Operational Parameters on the Performance of a Small Rectangular Baler https://journals.epu.edu.iq/index.php/polytechnic/article/view/226 <p>The experiment was carried out on a private farm in Karak village in 2017 to study the effects of the method of throwing the straw behind the combine harvester and some operational factors on the performance of a small rectangular baler. The field was planted with wheat (<em>Triticum</em> spp.) and barley (<em>Hordeum vulgare</em>). A small rectangular baler type (Ćicoria 454), Italian made was used to pick up and bale the straws, which were thrown as heaps and windrows in the field. The results obtained showed that picking up the straw as windrows improved the baler’s performance over the heaps in terms of number of mechanical units stops, time require for baling, fuel consumption, baler’s throughput capacity, and baler’s throughput efficiency, on the other hand, the forward speed also affected the baler’s performance when the straw was thrown as windrows; By increasing the forward speed, the slippage percentage increased but the fuel consumption, baler’s throughput efficiency, and baler’s throughput capacity decreased.</p> Affan O. Hussein Copyright (c) 2020 Affan O. Hussein https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 21 26 10.25156/ptj.v10n2y2020.pp21-26 Prevalence of Needlestick Injuries among Healthcare Workers in Rizgary Teaching Hospital https://journals.epu.edu.iq/index.php/polytechnic/article/view/96 <p>Needlestick injury in healthcare settings is a global issue. Despite being recognized for many years, needlestick and sharps injuries (NSIs) continue to present a risk of occupational exposure to blood-borne pathogens for health care works (HCWs). The objectives of the study were to determine the prevalence of needlestick injuries among HCWs in Rizgary Teaching Hospital and to identify the causes of needlestick injuries. A cross-sectional study was conducted on 76 healthcare workers in Rizgary Teaching hospital; there were a total of 45 males, 31 females. The data collections were administrated using face-to-face interviews to ensure a good response rate and to ensure all questions were answered. Most (52.6%) needlestick injuries occurred in wards with syringe needles being the most common causative tool; surgery ward was the most prevalent site of needlestick injuries occurrence (42.1%). The percentage of acupuncture was high and needles were the most common cause, and most injuries occurred during the re-use of the needles. The study recommends several measures to prevent and reduce acute injuries among HCWs; these measures include health education, behavior change, safer devices, and an educational program to educate these HCWs.</p> Salah H. Ali Peshtewan T. Majeed Umed A. Huwiezy Copyright (c) 2020 Salah H. Ali, Peshtewan T. Majeed, Umed A. Huwiezy https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 27 31 10.25156/ptj.v10n2y2020.pp27-31 Evaluation of Bond Strength and Dimensional Accuracy of Soft Liner to Microwave Cured Denture Base Material https://journals.epu.edu.iq/index.php/polytechnic/article/view/165 <p>Today, soft liners are being widely used in dental practices by their application to the inner surfaces of the denture with hopes to evenly distribute any potential uneven forces, and to provide a cushion effect to the oral mucosa of the patient mouth. The aim of this study is to investigate the influence of (a) polymethylmethacrylate (PMMA) denture base material curing technique, (b) Molloplast B soft liner curing technique, and (c) PMMA surface treatment, on the “shear bond strength” (SBS) between the Molloplast B liner and PMMA. A total of 80 samples were used in this study to evaluate the SBS performance of microwave (Nature-Cryl, Acron Gc, Japan) and conventional water bath (Ivoclar triplex, Liechtenstein) curing techniques of PMMA, and to evaluate the curing technique of soft liner material Molloplast B (DETAX,GERMANY). Surface treatment of PMMA was performed for half of the samples using neodymium:yttrium aluminum-garnet Nd:YAG laser, and the other half of the samples were surface-treated using AL<sub>2</sub>O<sub>3</sub> sandblasting method. The results showed that the highest mean value in conventional water bath-cured soft liner was 26.69 MPa, whereas the lowest mean value for microwave-cured soft liner was 15.22 MPa. No significant difference was observed between the SBS performance regarding the PMMA surface treatment and curing techniques. Conventional water bath curing technique for soft liner treatment improved the SBS performance. Regarding the PMMA curing technique, the conventional water bath achieved higher SBS, yet the difference was not statistically significant. Finally, surface treatment using laser improved the SBS compared to sandblasted method, but the improvement here was also statistically insignificant.</p> Shilan H. Fatah Radhwan H. Hasan Copyright (c) 2020 Shilan H. Fatah, Radhwan H. Hasan https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 32 37 10.25156/ptj.v10n2y2020.pp32-37 Determination of Potential Runoff Coefficient using Geographic Information System for a Small Basin in Balakayety Watershade, Kurdistan Region of Iraq https://journals.epu.edu.iq/index.php/polytechnic/article/view/182 <p>Runoff coefficient is an index for losses in rainfall required in most hydrological models and water resources projects. Generally, in the Balakayety water shade in Kurdistan region of Iraq, no runoff data are available as almost basins are ungagged. The Geographic Information System (GIS) techniques and available data for a small basin in Balakayety watershed within the Erbil governorate (Kurdistan Region of Iraq) were used to estimate the coefficient of potential runoff coefficient (PRC). The estimated PRC will be then used to calculate the depth of runoff. The Satellite Imagery (Landsat 7 ETM+) for 2015 was procured to create land cover classes, the classifications accuracy equal to 88.4%, and the Kappa index is 83.7%. The slope map developed from the digital elevation model with 30 m resolution. The area’s hydrologic soil map is digitized from the Iraqi soil map. The inverse distance weighting method was used to interpolate the rainfall of the study area into the Arc GIS. It was found that the most study area covered by moderate to high (PRC) values ranged from 55% to 83%, and runoff depth values vary from 398.1 mm to 610.3 mm. The present study indicates that the integration of all obtained thematic maps into GIS provides a powerful tool for calculating the runoff coefficient for catchments lacks streamflow data which can result in flood/drought predictions that will be not accurate. These findings are helpful in identifying flood areas, selecting proper sites for water harvesting, and enhancing water resources management programs.</p> Jehan M. Fattah Sheikh Suleimany Copyright (c) 2020 Jehan M. Fattah Sheikh Suleimany https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 38 43 10.25156/ptj.v10n2y2020.pp38-43 Effects of Dam Gate Geometry on Pressure Variation Aided by Map Presentation https://journals.epu.edu.iq/index.php/polytechnic/article/view/194 <p>The dam vertical lift gate is one of the most important operational parts that regulate the high head water flow to power plants as well as satisfying the water needs for projects and areas downstream of the dam. Due to the high water levels in the dam reservoir, the gates are subjected to many hydrostatic and dynamic pressures that affect their performance and stability. Hence, it became necessary to study all parameters that may cause excessive pressures which may lead to reduce the gate performance efficiency or even cause failure. In the current study, the pressure distribution along the bottom surface of various gate lip shapes has been measured and presented as contour maps using Surfer software. The pressure fluctuation was observed to indicate the intensity of flow separation and reattachment which, in turn, causes a vibration that may threaten the stability of the gate or impede its proper functioning. The pressures in this study are expressed as a dimensional coefficient through the integration of pressure measurements at 8 points distributed over the bottom gate surface. The high intensity of pressure attachment indicates the critical condition for hydraulic design.</p> Sheeraz M. Ameen Thamir M. Ahmed Copyright (c) 2020 Sheeraz M. Ameen, Thamir M. Ahmed https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 44 52 10.25156/ptj.v10n2y2020.pp44-52 Biocompatibility of Styrene-butadiene Copolymer-modified Calcium Phosphate and Mineral Trioxide Aggregate https://journals.epu.edu.iq/index.php/polytechnic/article/view/198 <p>The biocompatibility of root canal filling material is one of the basic conditions for a successful endodontic treatment and healing of the periodontium. This study was aimed to evaluate the biocompatibility of calcium phosphate cement modified with the styrene-butadiene copolymer-modified calcium phosphate (mCPC) by its implantation in the subcutaneous tissue of rabbit. Fifteen female rabbits of comparable weight were used in this study, each one had received three different tubes; one containing mCPC, the other with mineral trioxide aggregate Fillapex, and an empty control tube on the subcutaneous tissue of thighs. After a definite time (3, 7, and 14 days), the tissues around the tubes were collected, fixed, and processed for histologic evaluation. A histopathological specialist measured the intensity of inflammation. Kruskal–Wallis test was used to analyze the data. The results showed a significant difference with mCPC group in different periods, there was a high intensity of inflammation at the beginning, then it fell, and sustained as mild inflammation. One can conclude that the new formulation of CPC considered biocompatible, which rises the success rate of endodontic treatment.</p> Hala B. kaka Raid F. Salman Copyright (c) 2020 Hala B. kaka, Raid F. Salman https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 53 59 10.25156/ptj.v10n2y2020.pp53-59 Association between Smartphone Addiction and Physical Activity, Sleeping Hours among Medical Science Students in Duhok City https://journals.epu.edu.iq/index.php/polytechnic/article/view/218 <p><strong>Background and Aim</strong>: Smartphones become a part of today’s life. In spite of the convenience, it contributes to our daily lives and activities, one of the most important problems is smartphone addiction. As known, smartphone addiction is a type of technological addiction or non-substance addiction. The present study is to investigate the association between smartphone addiction and physical activity, sleeping hours among medical science students in Duhok City.<br /><strong>Subjects and Methods</strong>: A cross-sectional study design carried out with 295 students in medical science colleges in the Duhok City of both gender. Self-reported data collected from December 15, 2019, to January 22, 2020. Structured questionnaire has been used to gather data related to sociodemographic, physical activity, sleeping hours, and smartphone addiction.<br /><strong>Results</strong>: The study found most students, 78.3% have smartphone addiction, 78% of medical science students are at low physical activity range, and only 2% of students are at normal physical activity range, also revealed 20% of students were inactive. According to daily sleeping hours, more than half of them, 61.7% were in a healthy range of sleeping; however, no statistically significant association found between smartphone addiction with physical activity, sleeping hours while finding a highly statistically significant association between smartphone addiction with gender.<br /><strong>Conclusion</strong>: The current study figure out smartphone addiction prevalence was very high among medical science college students. Smartphone addiction showed an effect in increasing sedentary health behavior like low physical activity and poor sleeping quality with no statistically significant association.</p> Rebar Y. Abdullah Kawther M. Galary Robar A. Majid Copyright (c) 2020 Rebar Y. Abdullah, Kawther M. Galary, Robar A. Majid https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 60 65 10.25156/ptj.v10n2y2020.pp60-65 Root Dentine Strain Generation during Root Canal Instrumentation with Rotation and Reciprocation Motions https://journals.epu.edu.iq/index.php/polytechnic/article/view/223 <p>The aim of the study is to measure and compare strain generated on root dentine surface by two different instrumentation motions. Thirty extracted single canal premolars were used in this study which randomly was divided into two groups, one group was prepared with ProTaper NEXT X2 file in rotation motion, and the second group was prepared by WaveOne GOLD primary file in reciprocation motion, the canals were irrigated during canal preparation by 2 ml of sodium hypochlorite and 17% EDTA gel was used. Strain measurement was performed by strain gauges and a digital strain output reader, data were recorded every 5 s for 50 s. The results of this study have shown that WaveOne GOLD had higher mean 0.7308±0.41106 than ProTaper next 0.5385±0.39904 which means WaveOne GOLD generates greater strain than ProTaper NEXT. However, according to Student’s t-test between two groups there is no statistical difference between them. Based on the results of this study, there was no difference between the two motions; both motions generated strain on root dentine surface.</p> Bnar O. Hama faraj Raid F. Salman Copyright (c) 2020 Bnar O. Hama faraj, Raid F. Salman https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 66 70 10.25156/ptj.v10n2y2020.pp66-70 Association of Lipid Profile with Body Mass Index in Public Employees in Halabja City, Kurdistan Region of Iraq https://journals.epu.edu.iq/index.php/polytechnic/article/view/232 <p>Obesity and overweight are extensive phenomena that reached epidemics extent worldwide, including the Kurdistan region of Iraq. The aim of this study is to evaluate the values of total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), body mass index (BMI), and the state of physical activity in Halabja’s public employees. Overall 355 adults aged from 19 to 63 including 246 males and 109 females contributed to the study. The lipid profiles were tested in all subjects after over-night fasting. In addition, anthropometry measurements were taken; the mean height for males is 1.7129 m and 1.5732 m for females. The mean weights of males and females are 80.4813 and 69.9459 kg, respectively. The mean BMI value for males and females is 27.4258 and 28.3274, respectively. Some of the cases were diagnosed with diabetes, renal diseases, hypertension, and other relevant diseases. 246 of participants adopted sedentary lifestyles while 109 of them lived an active lifestyle. 65, 162, 98, and 206 of participants had TC, TG, LDL-C, and HDL-C off-limits, respectively. Pearson’s correlation between BMI with TC, TG, and LDL-C showed a significant relationship at 0.01 level as 0.156**, 0.140**, and 0.144**, respectively. HDL-C was negatively correlated to BMI at −0.062 level. The analysis of variance showed statistically significant p-values between TC, TG, and HDL-C according to BMI at 0.027, 0.000, and 0.000, respectively. The sedentary group of participants showed a higher Mean range of TC, TG, LDL-C, and HDL-C than an active group of participants.</p> Tareq H. Abdullah Hardi R. Baqi Salar H. Karim Dashti A. Ghafor Copyright (c) 2020 Tareq H. Abdullah, Hardi R. Baqi, Salar H. Karim, Dashti A. Ghafor https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 71 80 10.25156/ptj.v10n2y2020.pp71-80 Prevalence and Distribution of Oral Conditions among Dental out Patients Children Aged 0–13 Years Attending Khanzad Polyclinic Center in Erbil City https://journals.epu.edu.iq/index.php/polytechnic/article/view/235 <p>Prevalence studies on oral conditions affecting children are rare worldwide, and none of them was conducted in in Erbil/Kurdistan region/Iraq. The aims in the this study were to determine the prevalence and distribution of oral conditions which include both lesions and normal variations in group of patients referred to a main, public specialized poly clinics dental center. A prospective cross-sectional study was performed, the including data collected were age, gender, and site of a condition. The examination of the patients was performed under standardized conditions; using artificial light, disposable gloves, retractors, and mirror with sterile gauze to hold tip of the tongue. Statistical analysis was performed using Statistical Package for the Social Sciences (SPSS) version 22; Fisher’s exact test; and Chi-square test. A sample of 520 children, aged range (0–13) years included in this study, 265 (51.0%) were males and 255 (49.0%) were females, divided into three age groups; 100 (19.2%) were &lt;5 years, 274 (52.7%) were 5–9 years, and 146 (28.1%) were 10–13 years. The prevalence of oral conditions was significantly higher in 5–9 years (52.7%). The most commonly clinically diagnosed oral conditions were fissure tongue (13.1%), followed by gingivitis (9.0%) and dentoalveolar sinus (8.3%). As a first study in this age group in Erbil/Kurdistan region/Iraq, oral conditions are relatively common in the sample examined; dentist and dental practitioner should be aware for their recognition and referral for management.</p> Banaz A. Abdullah Shaheen A. Ahmed Ali F. Mohammad Alzubaidee Copyright (c) 2020 Banaz A. Abdullah, Shaheen A. Ahmed, Ali F. Alzubaidee https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 81 86 10.25156/ptj.v10n2y2020.pp81-86 Bolton Ratio of Different Angle’s Classifications in a School Children Sample of Erbil City https://journals.epu.edu.iq/index.php/polytechnic/article/view/249 <p>Aims of this study were to determine both the Bolton anterior and overall ratios in a representative sample of Erbil schoolchildren of Normal occlusion and Cl I, Cl II div I, div II, and Cl III malocclusion, also to find if there are any gender differences. Numerical data were obtained, comprised of 320 samples study casts of students with a mean age of 13–15 years selected from different schools in Erbil City. The casts were divided into 5 groups according to the type of malocclusion: Normal (n = 64), Cl I (n = 64), Class II div I (n = 64), Class II div II (n = 64), and Class III subjects (n = 64). The measurement of the greatest mesiodistal width of the teeth was performed using digital Vernier directly on the study casts, from the distal surface of the left first molar to the distal surface of the right first molar. The overall and anterior ratios between the maxillary and mandibular teeth were computed and evaluated using Bolton’s method. The results revealed that the mean anterior ratio (78.863) was higher and statistically signifi cantly different from anterior Bolton’s (77.2) and also the mean overall ratio was not statistically signifi cant different from Bolton’s ratio (91.3) (P = 0.239), with respect to the overall and anterior ratios among all the groups, statistically significant differences were found. Differences between genders were analyzed using a t-test. The results showed that there were no signifi cant differences between males and females. There were non-significant differences between the findings of the present study and those of Bolton’s study for overall ratio and anterior ratio, but among all five classifications, there was a significant difference of Erbil population not similar to Bolton ratio and there was no significant difference between males and females.</p> Amanj R. Ibrahim Zana Q. Omer Hasan S. Hasan Walaa M. Saleem Almola Copyright (c) 2020 Amanj R. Ibrahim, Zana Q. Omer , Hasan S. Hasan, Walaa M. Saleem Almola https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 87 97 10.25156/ptj.v10n2y2020.pp87-97 Prevalence and Phylogenetic Analysis of Babesia ovis Isolated from Sheep and Goats in Erbil Province, Kurdistan Region- Iraq https://journals.epu.edu.iq/index.php/polytechnic/article/view/184 <p>A total of 143 blood smears were obtained from sheep and goats (<em>n</em> = 98) and (<em>n</em> = 45), respectively, by jugular venipuncture between February 2019 and December 2019. Samples were examined for parasite occurrences. Results reveal that the prevalence of infection by the parasite was 12.24% and 11.11%, respectively (microscopically), while 20.41% sheep and 17.78% goats (molecular-based identification using 18S SSU rRNA sequence). Both methods revealed the specificity and sensitivity of the diagnostic assays. Phylogenetic analysis of Babesia ovis (MN309736-MN309745) displays that the pathogens identified in this study are clustered together, which indicating similar molecular characteristics. Overall, these results provide a better understanding that Babesiosis is highly prevalent in the study area and continuous monitoring of tick-borne pathogen in sheep and goats are essentially required in Erbil Province.</p> Zuber I. Hassan Copyright (c) 2020 Zuber I. Hassan https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 98 104 Micro-Computed Tomographic Evaluation of Sealing Ability of Different Bioceramic Endodontic Sealers https://journals.epu.edu.iq/index.php/polytechnic/article/view/200 <div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p>The aim of the present study was to compare sealing ability of three bioceramic sealers, including Endosequence BC and BioRoot RCS, with bioceramic-coated gutta-percha cone (BCGP) or GP in comparison to a clinical reference standard AH Plus sealer using high-resolution micro-computed tomography (micro-CT) analysis. Fifty freshly extracted single canal premolars were included in the study. All the samples were prepared using 2 Shape rotary system TS1 (25/0.04), TS2 (25/0.06), and F35 (35/0.06) file. After completion of the instrumentation, the samples were randomly divided based on the sealer material used and GP into four experimental groups and one control group with Endosequence, BioRoot, and AH Plus sealers with BCGP and conventional GP. All groups were obturated with (35/0.06) single cone obturation and high resolution of micro-CT was used to determine percentage of voids within the canals. BCGP showed better result than GP at all groups. In BCGP group, there were no significant differences in the percentage of the voids except internal voids. However, in all conventional GP groups, there were significant differences. Within the limitations of this study, it could be concluded that none of the groups were free of voids, BCGP with bioceramic sealer significantly better than GP.</p> </div> </div> </div> Saya H. Raouf Dara H. Saeed Copyright (c) 2020 Saya H. Raouf, Dara H. Saeed https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 105 112 Three-Dimensional Surface Evaluation and Shear Bond Strength of Three Pre-treatment E-max Surfaces for Metal and Ceramic Orthodontic Brackets https://journals.epu.edu.iq/index.php/polytechnic/article/view/203 <p>3D evaluation and shear bond strength (SBS) for metal and ceramic brackets after three pre-treatment surfaces of lithium disilicate (LD) crowns. Sixty lithium disilicate (LD) crowns were fabricated in laboratory according to manufacturer instruction and then divided into six groups (three groups for metal brackets and three groups for ceramic one). The 1st group for both was treated with round diamond bur, the 2<sup>nd</sup> one by hydrofluoric acid (HFA) 9.0%, and the 3rd group by laser (Er,Cr:YSGG). All treated surfaces were examined by laser profilometer and scan electron microscope. The Scotchbond Universal Adhesive and Transbond XT were used for bracketing procedure for metal and ceramic bracket (central incisor, 0,022” slot). Universal testing machine was used for shear bond. A crosshead speed of 1 mm/min was used, and the maximum load necessary to deboned the bracket will be recorded. HFA treated surfaces gave a highest SBS for both metal and ceramic brackets, then laser and finally the bur. The lowest roughness parameter Sa (arithmetical mean height) was in bur, both laser and HFA gave no significant differences. The HFA gave a highest Sz (maximum height) and Spc (arithmetic mean peak curvature) value. To increase the shear bond strength, the HFA is one of the best methods for roughness although the laser gave nearby roughness parameters. Ceramic brackets gave higher SBS than metal one with all pre-treatment procedures.</p> Huda A. Mohammed Omar S. Ali Copyright (c) 2020 Huda A. Mohammed, Omar S. Ali https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 113 118 Molecular Identification and Antibacterial Activity of Streptomyces spp. Isolated from Sulaymaniyah Governorate Soil, Iraqi Kurdistan https://journals.epu.edu.iq/index.php/polytechnic/article/view/205 <p>Soil is play an important role for reserve abundant groups of microorganisms, especially <em>Streptomyces</em>. <em>Streptomyces</em> are recognized as prokaryotes, aerobic and Gram-positive bacteria with high Guanine + Cytosine contents in their DNA. These groups of bacteria show filamentous growth from a single spore and they are normally found in all kinds of ecosystems, including water, soil, and plants. A total of three <em>Streptomyces</em> strains were isolated from soil of the sides of Darband Ranya in Sulaimani governorate. Different approaches were followed for the identification of the isolated stains. Morphological and cultural properties of these isolates have shown that the isolates are belonging to the genus <em>Streptomyces</em>. Desired colonies of the isolates were distinguished and separated from other bacteria on the basis of colony morphology, pigmentation, ability to produce a different color of aerial hyphae, and bottom mycelium on raffinose-histidine agar and starch-casein agar media. In addition, analysis of phylogenetic tree based on 16S rRNA gene sequences, the strains related the genus. KS010 isolates had the highest identity (99.32%) with the type strain of <em>Streptomyces</em> atrovirens, while KS005 and KS007 isolates were most closely related to <em>Streptomyces</em> lateritius by identity 99.32%. The isolated test strains were also active against Gram-negative and Gram-positive pathogenic bacteria following co-cultivation technique. However, further study should be done to identify the types of these antibacterial compounds.</p> Syamand A. Qadir Osama H. Shareef Othman A. Mohammed Copyright (c) 2020 Syamand A. Qadir, Osama H. Shareef, Othman A. Mohammed https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 119 125 Influences of polymer modifiers on Porous Hot Asphalt Mixture Property and Durability https://journals.epu.edu.iq/index.php/polytechnic/article/view/213 <p>Fundamentally, sustainability and cost-effectiveness in infrastructure development have received widespread attention. Permeable pavement is such a concept that it is sustainable in the field of transportation and is being tested. Fully permeable pavement is a modern design method in which each layer is porous and can store water, avoiding the impact of stormwater on the pavement to avoid stormwater, skidding, floods, and water splash on the road and parking area which decrease safety rate. Porous asphalt (PA) is an asphalt mixture with a little or no fine aggregate. Due to open structures and advantages are used as a drainage layer in highway pavements in reducing noise and decreasing safety hazards during rainfall. Besides, it reduces splash and spray effects and thus increases the visibility. The main aim of this study is to analyze the influence of two asphalt modifier types: Styrene butadiene styrene (SBS) and propylene modifier polypropylene (PP), on porous hot asphalt mixture performance. The PA evaluation influence findings are based on permeability, durability, and Marshall stability-flow for hot asphalt mixture. The test results emphasize the modifier usage in reducing the abrasion loss and increasing the stability with enhancing the durability of PA. PA mixture binder prepared with 4% SBS and 4% PP modifier was the most polymer binder in modifying the abrasion resistance and stability of mixture in pavements.</p> Mohammed Q. Ali Ganjeena J. Khoshnaw Copyright (c) 2020 Mohammed Q. Ali, Ganjeena J. Khoshnaw https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 126 131 Effect of Adding Magnesium Oxide Nanoparticles on the Antimicrobial Activity of a Denture Soft Liner https://journals.epu.edu.iq/index.php/polytechnic/article/view/250 <p>Microbial growth and colonization are one of the disadvantages after the long-term use of denture soft liners. This study was aimed to evaluate the effect of the addition of magnesium oxide nanoparticles (MgONPs) on the antimicrobial activity of a denture soft liner. A total of 84 samples were prepared from a soft denture liner and divided into two groups, control group and test group to which 3% by weight of MgONPs were added, antimicrobial tests for <em>Candida albicans, Staphylococcus aureus</em>, and a mixture of the biofilm of both microorganisms were done, cell density count and adherence assay test was recorded before and after 6 months storage in distilled water. The results showed that the modified group performed a better antimicrobial activity compared to the control group, the addition of 3% of the nanofiller showed a significant reduction in the mean value of growth of both <em>C. albicans, S. aureus</em>, and the biofilm mixture (<em>P</em> &lt; 0.05) before and after the storage period. In conclusion, the addition of 3% by weight of MgONPs to the denture soft liner significantly suppressed the growth of <em>C. albicans, S. aureus</em> up to 6 months.</p> Hoshang K. Abdel-Rahman Salem A. Salem Al-Sammaraie Copyright (c) 2020 Hoshang K. Abdel-Rahman, Salem A. Salem Al-Sammaraie https://creativecommons.org/licenses/by-nc-nd/4.0 2020-12-30 2020-12-30 10 2 132 137