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Article
Comparative Study of The Amount of Apically Extrusion Of Debris During Root Canal Preparation Using Wave One™, Trushape 3D™, Hyflex™ CM and One Shape™ Instrumentation Systems (An In Vitro Study)

Authors: Ali W. Hadi --- Mohammed R. Hameed محمد رشيد حميد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 1 Pages: 1-8
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Many types of instruments and techniques are used in the instrumentation of the root canal system. These instruments and techniques may extrude debris beyond the apical foramen and may cause post-instrumentation complications. The aim of this study was to evaluate the amount of apically extruded debris resulted by using 4 types of nickel-titanium instruments (WaveOne, TRUShape 3D conforming files, Hyflex CM, and One Shape files) during endodontic instrumentation.Materials and methods: Forty freshly extracted human mandibular second premolar with straight canals and a single apex were collected for this study. All teeth were cut to similar lengths. Pre-weighted glass vials were used as collecting containers. Samples were randomly divided into four groups with 10 samples in each group: Group A instrumentation by WaveOne reciprocating file, Group B instrumentation by TRUShape 3D rotating files, Group C instrumentation by Hyflex CM rotating files and Group D instrumentation by One Shape rotating file. A total volume of 7 ml of sodium hypochlorite was used for irrigation in each sample. Apical patency confirmed and maintained by a size #15 K-File. All canals were instrumented up to a size #25. After completion of endodontic instrumentation, vials were then stored in an incubator for 5 days at 68o C for dryness. Then vials are weighted again, and the pre-weight subtracted from the post-weight, the weight difference resembled the amount of apically extruded debris from the apical foramen during root canal instrumentation. Data obtained were statistically analysed by using ANOVA and LSD tests.Results: The results showed that the Hyflex CM Group (C) has statistical significant lowest apically extruded debris as compared to other groups of this study (P ≤0.05), while the TRUShape Group (B) has statistical significant lowest apically extruded debris as compared to One Shape Group (D) and WaveOne Group (A), while the WaveOne Group (A) showed the highest value of apically extruded debris (p ≤0.01). The result showed that all groups resulted in apical extrusion of debris.Significance: Although all systems caused apical extrusion of debris and irrigant, continuous rotary instrumentation was associated with less extrusion as compared with the use of reciprocating file system


Article
Effect of Cooling Rate on the Phase Transformations Behavior and Hardness of NiTi Shape Memory Alloys

Authors: Hiba Adil --- Abeer Sami --- Moqdad Juber --- Nawal Mohammed Dawood
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2015 Volume: 23 Issue: 2 Pages: 363-371
Publisher: Babylon University جامعة بابل

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Abstract

NiTi alloy is well- known shape memory alloys and has been widely used for bio-medical, mechanical and electrical applications. In this study, a Ni - rich porous NiTi alloys are produced by powder metallurgy technique. Three samples of these alloys were cooled in three media: furnace, water, and ice bath. X-ray diffraction (XRD) was used in the study as characterization techniques, hardness measurement and shape memory effect (SME) properties were carried out to investigate the effect of cooling rate on phases and mechanical properties. XRD test shows that the sintered samples consist of three phases at room temperature (NiTi monoclinic phase, NiTi cubic phase and Ni3Ti hexagonal phase) .The results show the correlation between cooling rate and properties of the alloy

تعرف سبيكة NiTi بانها من السبائك ذاكرة الشكل وتستخدم بشكل واسع في التطبيقات الاحيائية الطبية والميكانيكية والكهربائية. في هده الدراسة حضرت سبيكة NiTi المسامية الغنية بالنيكل بتقنية ميتالورجيا المساحيق. بردت ثلاثة عينات من هده السبائك في ثلاثة أوساط: الفرن، الماء، الثلج. استخدمت تقنية حيود الاشعة السينية (XRD) لوصف الاطوار المتكونة. كما أجري اختبار فيكرز للصلادة وتأثير استعادة الشكل (SME) لمعرفة تأثير معدل التبريد على الاطوار والخواص الميكانيكية. أظهرت اختبارات XRD تكون العينات الملبدة من ثلاثة اطوار في درجة حرارة الغرفة (احادي الميل NiTi، الطور المكعب، NiTiالطور السداسي Ni3Ti. أظهرت النتائج وجود علاقة بين معدل التبريد وخواص السبيكة.


Article
Evaluation of apically extruded debris by using hand and rotary Nickel-Titanium instruments

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Abstract

This study evaluated the amount of apical debris, using hand, rotary ProTaper instruments, and rotary ProFile instruments. Forty five of mandibular premolars with single root were randomly divided into three groups. The teeth in all groups were instrumented until reaching the working length, with ProFile, rotary ProTaper and hand PrpTaper instruments. Debris extruded from the apical foramen was collected into preweighed polyethylene vials and the extruded irrigant was evaporated. The weight of the dry extruded debris was established by comparing the pre-and post instrumentation weight of polyethylene vials for each group. All instruments tested produce a measurable amount of debris, a statistically significant difference was observed between ProTaper instruments and ProFile group in term of debris extrusion (P < 0.001). Although ProTaper rotary extruded a relatively higher amount of debris, no statistically significance difference was observed between this type and the ProTaper hand instruments (P > 0.05).


Article
An Evaluation of Coronal Seal of Root Canals Prepared by Different Systems

Author: Sabah A Ismail
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 95-101
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aim of this in vitro study was to evaluate the coronal seal of root canals prepared by two NiTi systems. Materials and Methods: Thirty-six extracted human teeth with single root canal were decoronated at the cemento-enamel junction (CEJ). The working length was determined for each tooth. Thirty teeth were divided into three groups ten of each. Group I teeth were prepared by Pro-Taper NiTi rotary instruments, then obturated by matched-taper single cone. Group II teeth were prepared by Ra-Ce NiTi rotary instruments and obturated also by matched-taper single cone. Group III teeth were pre-pared by hand K-files instrument then obturated by gutta percha lateral condensation technique. Re-maining teeth were used as control group, three positive and three negative control. Tgadeseal was used as root canal sealer for all groups in this study. Dye penetration method was used to evaluate the coro-nal seal using a steromicroscope at 40X magnification. All teeth (experimental group and control groups) were longitudinally sectioned for examination of dye penetration. One-way analysis of vari-ance and Duncan's tests was used for statistical analysis. There was significant differences between the groups (p< 0.05). Results: Statistical analysis of the results demonstrated that there was no statistical significant difference in coronal seal between the two systems. While, there was a significant differ-ence between the two rotary Ni-Ti systems and the hand K-files instrument. Conclusion: The use of Ni-Ti rotary instrument for root canal preparation shows least coronal microleakage in comparision with hand K-files instrument.


Article
Evaluation of the amount of apically extruded debris using different root canal instrumentation systems

Authors: Dr. Iman M. Al-Zaka, B.D.S., M.Sc د. ايمان محمد الزقة --- Dr. Hashim M. Hussein, B.D.S. د.هاشم حسن
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2014 Volume: 11 Issue: 1 Pages: 1-10
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this study was to evaluate the amount of apically extruded debrisusing 5 types of nickel–titanium endodontic instruments (Hand ProTaper, RotaryProTaper, Rotary Mtwo, RECIPROC and WaveOne). Seventy-five freshly extractedmandibular premolar teeth were used in this study. All teeth were shortened to alength of 14mm. The specimens were randomly divided into five groups (each groupcontaining 15 samples) according to the type of instrumentation systems used. GroupI: instrumented by hand ProTaper system (Hand technique). Group II: instrumentedby rotary ProTaper system. Group III: instrumented by rotary Mtwo system. Group1V: instrumented by single file RECIPROC system. Group V: instrumented by singlefile WaveOne system. Debris extruded from the apical foramen was collected intopre-weighed glass vials. The difference between the weights of vial (pre-weight andpost-weight) represented the weight of debris extruded from apical foramen duringcanal preparation. The results showed that all groups induced extrusion of debris,Mtwo group (III) has statistically the lowest mean value of apically extruded debris incomparing with all other groups, followed by rotary ProTaper (II), hand ProTaper (I),and WaveOne (V) groups respectively. While the RECIPROC group (IV) hasstatistically highest mean value.


Article
The Incidence of dentinal root defects caused by different Nickel Titanium instruments

Authors: Dr. Iman M. Al-Zaka, B.D.S., M.Sc د. ايمان محمد الزقة --- Dr. Noor Aldiin A. Saieed B.D.S د. نور علاء الدين سعيد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2015 Volume: 12 Issue: 1 Pages: 1-9
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The aim of this in vitro study was to compare the effect of different NickelTitanium instruments on the root dentin in term of dentinal defects. Seventy-fivepalatal roots of maxillary first molars teeth were selected for the study. Fifteen rootswere left unprepared to serve as a negative control group; the remaining 60 roots weredivided into four tested groups. Group (I) prepared using ProTaper Universal, group(II) prepared by EndoSequence, Group (III) prepared by ProTaper Next and finallygroup (IV) prepared by RECIPROC systems. After preparation the roots wereembedded in clear acrylic and then sectioned at different levels (apical, middle andcoronally) and examined under Stereomicroscope. Results: No cracks were observedin the negative control group, while dentinal defects were observed in roots preparedwith ProTaper Universal, EndoSequence, ProTaper Next and RECIPROC systems(28.88%, 8.89%, 11.11% and 33.33% respectively). The results showed a nonsignificantdifference between EndoSequence and Protaper Next groups and betweenProTpaer Universal and RECIPROC groups (p > 0.05), ProTaper had a significantdifference with EndoSequence and ProTaper Next groups (P < 0.05) While TheRECIPROC group had a highly significant difference with EndoSequence andProTaper Next groups (P < 0.01). Conclusion, all instrumentation systems used in thisstudy created cracks in the root dentin. The EndoSequence and ProTaper Nextinstruments tended to cause least dentinal cracks compared with the ProTaperUniversal and RECIPROC instruments


Article
Dental implants in an orthodontically created spaces using NiTi open coil spring in anterior and premolar regions

Authors: Omar Fawzi Abduljabbar --- Omed I. Shihab --- Othman A. Omer
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2017 Volume: 21 Issue: 2 Pages: 1722-1725
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objective: Orthodontic space opening is a common treatment for congenitally missing teeth. Dental implants are often used to replace the missing tooth to establish ideal esthetics without restoring the adjacent teeth. This study aimed to investigate the outcome of implants placed in orthodontically created bone. Methods: Fifty dental implants were used for rehabilitation of lost tooth/teeth in 30 patients after space creation using orthodontic treatment. Patients with congenital and traumatic missing tooth/teeth, who lost the space for accommodation of normal size crown, and patients with spacing were enrolled in the study. NiTi open coil spring was used for space creation. The patients were followed up clinically and radiographically (OPG). Results: Out of 50 implants, the success rate was 78% (39 implants). Eleven implants (22%) failed to get osseointegration. Mean age of the patients was 26.33. Female patients constituted 63.33%, and male patients 36.67%. A new one replaced all the failed implants. Most of the failures were in the mandible. Conclusion: Orthodontic treatment can be used as a type of osteodistraction method for provision of an acceptable amount of bone for dental implants. The quality of the gained bone can be improved by offering sufficient time for healing.


Article
The effects of canal preparation by different NiTi rotary instruments and reciprocating WaveOne file on the incidence of dentinal defects

Author: Dr. Iman M. Al-Zaka, B.D.S., M.Sc د. ايمان محمد الزقى
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2012 Volume: 9 Issue: 2 Pages: 137-142
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this study was to compare dentinal defect formation while usinghand files (HFs), two brands of nickel-titanium (NiTi) rotary files and the WaveOnefile. Eighty mandibular first molars were selected and divided into 4 groups. Hand file(HFs), WaveOne reciprocating file (WO), EndoSequence file (ES), ProTaper file(PT), were used to prepare the 2 mesial canals. Roots were then sectioned 3, 6, and 9mm from the apex, and the cut surface was observed under a microscope and checkedfor the presence of dentinal defects. HF group showed the lowest percentages ofdentinal defects (5%). In roots prepared with the WO, ES, and PT, dentinal defectswere observed in 25%, 10%, and 50% of teeth, respectively. There was a significantdifference between HFs group and both of WO group and PT group (P <0.05).However, no significant difference was found between HFs group and ES group (P ≥0.05). Also a non significant difference was found between WO group and ES group(P ≥ 0.05). All rotary files created defects in the root dentin, whereas handinstrumentation presented with satisfactory results.


Article
I NVESTIGATION OF THE ADDITIVES FOR CHANGING ON PHASES AND CORROSION BEHAVIOR OF SHAPE MEMORY ALLOYS
دراسة تاثير الاضافات لتغير الاطوار ومقاومة التاكل لسبائك الذاكرة

Author: Mohammed Ali Tariq محمد علي طارق
Journal: Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد ISSN: 20761819 Year: 2011 Volume: 11 Issue: 3 Pages: 458-465
Publisher: Babylon University جامعة بابل

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Abstract

ABSTRACTNickel-Titanium shape memory alloy (Nitinol or NiTi) is a fascinating materialfor dental applications. In this work the alloy has been prepared by powdertechnology and the effect of Mg and Zn additives has been studied on the corrosionrate, in artificial saliva. Samples (without additives) were prepared using powdermixture of 55 wt.% Ni and 45 wt.% Ti by blending in a ball mill for two hours, thencompacted at 800 Mpa, and then sintered at 950 oC for 9 hours under controlledatmosphere (argon). The same approach was made for the samples with 0.1, 0.2 and0.3 wt% of Mg and Zn additions. XRD test shows that the sintered samples areconsisting of two phase's martensite and austenite at room temperatures.From theresults; it was found Zn additives increase the corrosion rate while Mg additivesdecrease the corrosion rate.

RMS ن. BLMDN ت ا BMPECQI: ا RMS TUVWIXMY: ة ا =ZBXM: اد ا HMY: ا U =CI]J م) HEFBIEJ - 78EF ( 789: ة ا => ذا @ABCD^M_` @MFa: م وا HEXMELcY: ت ا BSBMd ا =EefMJ TMD درا hMJ و iEZBXMY: ا BMEj رH:BIEU TMPk=Ql @ABCXM: ج ا BMIF ا hMJ noC: ا ا p ھvXMLl iEZBXMY: ا wM_Wl B ھ=ExMoJ hMJ ت) BSBd ون ا Vl س ( BDN ذج ا BYL: .ا R`BLs: ب ا B]_: ل ا H_oU RS 7>BI: ل ا V]U800 wcxl wE_W: ا {C> hJ he EI`BD ة VY: ات =8: ا TFHZB ط TQD اHl 45 ) wt% Ti) ، (55 wt% Ni )TEF وزز BM€ TQMD اHl ME_` =QEXMU HMl و ο ارة 950 م =MZ TMj رVl ت و B`BMD ة 9 VMY: VMEC_I: ا TME_Y` اء =Mj ا B ھVM]l و Mpa@MFa: ا MU 0.1 و 0.2 و 0.3 TMEF وز vXMLl ت BSBMdN ا ‚MU ذج BMYL: ا =ExMoI: ƒUVWIMD ا TMPk=Q: ا {M„F ن. HM> رN اƒkBXMLJ رBY: ا BMY ھ k رHM ط ^M_` ي HMIoJ ة VMC_Y: ذج ا BMYL: ن ا BMl †Md او TELEXM: ا T]M‡N د ا HMEZ ر BMCIˆ م. ا HEXMELcY: واTSBMd ا BMYLEl 7M>BI: ل ا V]U U VkaJ @Fa: ا TSBd ان ا Vj و ‰ABIL: ل ا Šˆ U . TS=c: ارة ا =Z Tj در RS ƒkBLID وN وا. RABEYE8: ا 7>BI: ل ا V]U 7_PJ م HEXELcY: ا


Article
Similar and Dissimilar Nd:YAGlaser Welding of NiTi Shape Memory Alloy to AISI 420Stainless Steel

Author: Jassim Mohammed Salman Al-Murshdy
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 1 Pages: 60-69
Publisher: Babylon University جامعة بابل

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Abstract

Similar NiTi shape memory alloy(SMA) plates, 420 Martensitic stainless steelplates and dissimilar NiTi shape memory alloy with Martensiticstainless steel were welded by a pulsed Nd:YAGlaser welding method.The nature microstructure of the base metal (BM), weld zone (WZ), interface and the heat affected zones(HAZ) were showedby in a scanning electron microscope (SEM) and optical microscope.Vickers hardness tests wasconducted to specifythe properties of the weld. The outcomes showed that the hardness of dissimilar NiTi-Stainless steel (St.St.) weld is higher than that in similar NiTi-NiTi and St.St.-St.St. weld.TheMicrostructural examination in both NiTi-St.St. and NiTi-NiTi welds illustrates that the solidification process in the fusion zone changed the kind of plan to the cell type as well as the changes that occur in the cell to dentritic kind of intra- region of the weld through the weld center in the welded sample sides but in the St.St.-St.St. weld showed dendrite microstructure. In this study it is found that the increase of the welding speed leads to a decrease in hardness in all jointsNiTi-NiTi, NiTi-St.St. and St.St.-St.St.

صفائح متشابهة للسبيكة الذاكرة الشكل (نيكل تيتانيوم)، صفائح الفولاذ المقاوم للصدأ المارتنسايتي(420) والصفائح المختلفة من السبيكة الذاكرة الشكل (نيكل تيتانيوم) والفولاذ المقاوم للصدأ المارتنسايتي قد تم لحامها بطريقة اللحام الليزر النبضي. تم استخدام المجهر الالكتروني الماسح والمجهر الضوئي لاظهار البنية المجهرية لمعدنالاساس ومنطقة اللحام والمنطقة المتاثره بالحرارة والمنطقة البينيه. جرىاختبار صلادة فيكرز لتحديد خواص اللحام.اشارتالنتائج الى ان صلادة اللحام للنيكل تيتانيوم-الفولاذ المقاوم للصدأ هو اعلى من صلاده اللحام المتشابة نيكل تيتانيوم- نيكل تيتانيوم او الفولاذ المقاوم للصدأ- الفولاذ المقاوم للصدأ. البنية المجهرية لكلا النوعين من اللحام نيكل تيتانيوم – الفولاذ المقاوم للصدأ، نيكل تيتانيوم- نيكل تيتانيومظهرت نوع التجمد على طول منطقة الانصهارو تتغير من مستوي الخلوي الى شجيري ظمن الحد الفاصل لمنطقة اللحام الى الخط الوسطي للمنطقة نفسها وفي كلا الجانبين من نيكل تيتانيوم وكذلك الفولاذ المقاوم للصدأ، لكن البنية المجهرية تظهر على شكل شجيري في اللحام الفولاذ المقاوم للصدأ-الفولاذ المقاوم للصدأ.في هذه الدراسة وجد أيضا ان زيادة سرعة اللحام تؤدي الى تقليل الصلاده في الأنواع الثلاثة من الربط.

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