Iraqi journal of laser最新文献

{"title":"Evaluation of 940 nm Diode Laser in Esthetic Crown Lengthening","authors":"Noor Ali, Mohammed Dhahir, Tahrir Aldelaimi","doi":"10.31900/ijl.v22i1.336","DOIUrl":"https://doi.org/10.31900/ijl.v22i1.336","url":null,"abstract":"Abstract Background: Crown lengthening is a surgical procedure that apically positions the gingival edge and/or removes supporting bone in order to increase the amount of supra gingival tooth structure for restorative or cosmetic purposes. The objective of the study: The purpose of this study was to evaluate the efficacy of the 940nm diode laser in esthetic crown lengthening surgery through clinical observations, patient questionnaires, clinical photographs, and gingival healing following gingival operations. Material and methods: In this randomized clinical trial, 16 patients (11 females and 5 males) had their crowns surgically lengthened using a diode laser (940 nm) in continuous wave (CW) mode with 1 watt energy settings. A visual analogue scale is used on the first, third, seventh, and twenty-first days following surgery to record pain, swelling, bleeding, functional interference, tooth sensitivity, and success from an aesthetic standpoint, as well as overall patient satisfaction based on patient opinion and clinical photographs. Results: In the present study, we noticed that the scale of pain, bleeding, oedema, function interferance, and tooth sensitization significantly decreased gradually during the first two visits. The measured parameters completely disappeared after one week in most cases, as well as increase patient satisfaction and aesthetic achievement. The patients were recalled three weeks later, the wounds had totally healed, and the patient were not complaining of any pain. Conclusion: Crown lengthening requires optimal gingival margin design. This involves precise shaping of delicate tissues, which is difficult with the scalpel. While Lasers give improved gingival sculpting control and can be used for aesthetic crown lengthening. The laser surgery has many advantages, including excellent hemostasis with little or no bleeding, being less invasive and sterile wound cut, causing less pain and suffering during and after surgery, and enhancing patient satisfaction since the operation is short and, in most circumstances, relatively painless. Also, in laser surgery, there is less functional interruption and enhanced patient satisfaction since a periodontal pack is not needed to cover the surgery site. The healing is faster and more aesthetic when using laser surgery procedure.","PeriodicalId":500031,"journal":{"name":"Iraqi journal of laser","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136097395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance Study of Polarization Beam Splitters Based on Horizontal Slot Waveguide Operating at 700nm Wavelength","authors":"Salwa Salih, Shelan Tawfeeq","doi":"10.31900/ijl.v22i1.391","DOIUrl":"https://doi.org/10.31900/ijl.v22i1.391","url":null,"abstract":"Abstract: Polarization beam splitter (PBS) integrated waveguides are the key components in the receiver of quantum key distribution (QKD) systems. Their function is to analyze the polarization of polarized light and separate the transverse-electric (TE) and transverse-magnetic (TM) polarizations into different waveguides. In this paper, a performance study of polarization beam splitters based on horizontal slot waveguide has been investigated for a wavelength of . PBS based on horizontal slot waveguide structure shows a polarization extinction ratio for quasi-TE and quasi-TM modes larger than with insertion loss below and a bandwidth of . Also, the fabrication tolerance of the structure is analyzed.","PeriodicalId":500031,"journal":{"name":"Iraqi journal of laser","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136063796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness of 980nm diode Laser in reduction the diameters of exposed dentinal tubules for hypersensitive tooth","authors":"Rana Hashim, Mohammed Dhahir, Salah A. AlKurtas","doi":"10.31900/ijl.v22i1.373","DOIUrl":"https://doi.org/10.31900/ijl.v22i1.373","url":null,"abstract":"Abstracts: Background: The oral cavity is a complex environment, both structurally and functionally, the hard and soft tissues are in close a proximity. Oral tissues subjected to wear throughout the life, that threatened the vitality of the pulp or increase the sensitivity of dentinal tubules. One of the common dental problems is loss of enamel or cementum, which stimulate the nerve ending in or near the pulp and manifested as pain sensation. Aim of the study: This study had done to evaluate the effects of 980nm diode Laser in diameters reduction of exposed dentinal tubules analyze the results and morphological changes of irradiated dentine surface by FE-SEM (field emission scanning electron microscope) analysis. Material and Method: Thirty-nine human extracted impacted 3rd molar teeth were tested in this study and divided into control Group (N=15), pilot study (N=9) and study group (N=15). The study group irradiated with 980nm diode Laser to the occlusal surface of the teeth after the application of 17% EDTA (Ethelyn diamine tetra acetic acid) for smear layer removal. The intra-pulpal temperature recorded for every second and monitored for 120s from the first second of irradiation by a thermometer (prośket MT-1820, 1st Edition, 2016, Taiwan), for detection the recovery time of initial tooth temperature. FE-SEM analysis to all teeth (control, pilot and study groups) for assessment the morphological changes after surface irradiation. Results: FE-SEM analysis to the irradiated surface show significant reduction in diameters of the exposed dentinal tubules irradiated by 980nm diode Laser. Conclusion: The selected parameters (1.5W/10s, 276.3W/cm2) were able to seal exposed dentinal tubules without any sign of cracks or fissures. Suggestion: The parameters used with this study (1.5W, 10s, 276.3W/cm2) can be utilize in the future treatment protocol to the management of dentinal hypersensitivity.","PeriodicalId":500031,"journal":{"name":"Iraqi journal of laser","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135364659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of nanoelectrodes number and length on enhancing the THz photomixer performance","authors":"Reiam Al-Mudhafar, Hussein Jawad","doi":"10.31900/ijl.v22i1.380","DOIUrl":"https://doi.org/10.31900/ijl.v22i1.380","url":null,"abstract":"Abstract: Despite the distinct features of the continuous wave (CW) Terahertz (THz) emitter using photomixing technique, it suffers from the relatively low radiation output power. Therefore, one of effective ways to improve the photomixer emitter performance was using nanodimensions electrodes inside the optical active region of the device. Due to the nanodimension sizes and good electrical conductivity of silver nanowires (Ag-NWs), they have been exploited as THz emitter electrodes. The excited surface plasmon polariton waves (SPPs) on the surface of nanowire enhances the incident excitation signal. Therefore, the photomixer based Ag-NW compared to conventional one significantly exhibits higher THz output signal. In this work, the effect of Ag-NWs dimensions and number on the incident optical field is investigated by utilizing the Computer Simulation Technology (CST) Studio Suite. The simulation results show that increasing Ag-NWs length to SPP propagation length ratio plays a significant role on the incident field increment due to its effect on reducing the SPP propagation losses. The increment of Ag-NWs number and length in the nanoelectrodes based photomixer can contribute to increase the electric field in the active region by 1.5 times at the longer excitation wavelength (850 nm). As a result of this increment, the THz output power and the conversion efficiency are expected to be enhanced by a factor of five","PeriodicalId":500031,"journal":{"name":"Iraqi journal of laser","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135364658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"بناء جهاز موائع جزيئي متكامل حساس ومنخفض التكلفة وسريع مع مضخة حقن لتحليل الإيبوبروفين","authors":"Huda Sakin, Rawaa Faris","doi":"10.31900/ijl.v22i1.370","DOIUrl":"https://doi.org/10.31900/ijl.v22i1.370","url":null,"abstract":"الخلاصة: تقدم أجهزة ميكروفلويديك مزايا فريدة لتطوير مقايسة وفحص الأدوية بكفاءة. قد توفر منصات ميكروفلويديك بديلًا أكثر سرعة وفعالية من حيث التكلفة. تنحصر السوائل في الأجهزة التي لها أبعاد كبيرة على مقياس ميكرومتر. بسبب هذه الابعاد الصغيرة ، فإن الأحجام المستخدمة في فحوصات الأدوية صغيرة (مليلتر إلى فيمتولتر). في هذا البحث ، تتكون شريحة ميكروفلويديك من قنوات ميكروية منحوتة على مواد ركيزة مبنية باستخدام شريحة أكريليك (بولي ميثيل ميثاكريلات ، PMMA) تم تصميمها باستخدام آلة ليزر ثاني أكسيد الكربون (CO2). تؤثر معلمات ثاني أكسيد الكربون على عرض وعمق وخشونة الرقاقة. من أجل الحصول على سطح قناة منتظم ، وخشونة منخفضة ، قوة الليزر (60 واط) ، مع سرعة مسح (250 م / ث) للسماح لنا بالحصول على قنوات صغيرة بقطر أدنى من العرض (450 ميكرومتر) ، وكان عمق القنوات 89.4 ميكرومتر و (متوسط ​​الخشونة الحسابي Ra = 2.3) ، (الخشونة النسبية ، Ɛ = 5٪) للسطح بدقة عالية وجودة سطح جيدة.تم استخدام الأنابيب النانوية الكربونية متعددة الجدران الوظيفية (F-MWCNTs) لتعزيز إشارة الدواء من أجل اكتشاف تركيز الإيبوبروفين القليل جدًا. في هذا العمل ، يتمتع مستشعر الموائع الدقيقة بالليزر بدقة عالية في الكشف عن الإيبوبروفين مقارنة بمقياس الطيف الضوئي بالطريقة التقليدية (UV-VIS) مع LOD يساوي 250 نانومتر ، 1 ميكرومتر على التوالي.","PeriodicalId":500031,"journal":{"name":"Iraqi journal of laser","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135364661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Angular Laser Cleaning of Aluminum Al-4004 with Different Spot Sizes","authors":"Eman Shaker, Ziad Aeyad Taha","doi":"10.31900/ijl.v22i1.351","DOIUrl":"https://doi.org/10.31900/ijl.v22i1.351","url":null,"abstract":"Abstract: When it comes to applications in welding, cutting, and surface engineering, the utilization of high-power fiber-delivered beams from solid-state lasers offers several benefits. This paper addresses the issue of cleaning the surface of the samples with different spot sizes (50, 100 and 200) (industrial ytterbium fiber laser) to prepared it to be welded. Angular laser cleaning with incident angles (5, 10, 15, 20, 25, 30) ° with different powers (3, 5, 7, 10) W and hatch distance 0.001 was use for implemented.","PeriodicalId":500031,"journal":{"name":"Iraqi journal of laser","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135364660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}