research centers


Search results: Found 4

Listing 1 - 4 of 4
Sort by

Article
Fracture Resistance of Roots After Canal Preparation by Two Methods and Obturated by Different Techniques ISSN

Author: Wiaam M.O. AL-Ashou
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 25 Pages: 212-219
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The purposes of this in vitro study are to investigate the effect of instrumentation types ( hand and rotary instrumentations) and obturation techniques (Cold lateral, and Thermafil) on vertical root fracture. Materials and Methods: The crown of the 100 single rooted teeth were removed leaving 12mm of the roots length, then the root randomly divided into four groups. Control –ve Group(n=10), Hand Group(n=30), ProTaper Group(n=30) and Helix Group(n=30) according to the type of the instrument used to prepared the root canals. After that, the last three groups subdivided into subgroups according to the obturation technique either by using Cold Lateral condensation technique or Thermafil obturation technique. After the sealer set, the roots were embedded in acrylic moulds and subjected to compressive loading, the load at which the fracture occurred was recorded and statically analysis. Results: the fracture resistance of the root prepared by Helix and ProTaper files were significantly greater than that obtained for the root canals prepared with hand K-files. The results of this study also demonstrated that when root canals obturated with Thermafil the roots resist the fracture load greater than that of the canals obturated with Cold Lateral condensation obturation but the difference is not statistically significant between them. Conclusions: the use of rotary nickel titanium files in endodontic treatment provides higher fracture resistance for the roots, and the use of the Cold Lateral condensation obturation technique may weaken the roots, so that the roots become more susceptible to the vertical root fracture.


Article
Evaluation of the Apical Seal in Root Canals Prepared with Rotary ProTaper Files and Obturated by Different Methods

Authors: Raghad A Al-Askary --- Wiaam M O Al-Ashou --- Sabah A Ismail
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 18 Pages: 390-396
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The aim of this in vitro study was to evaluate the apical sealing ability of matched-taper Single-cone, Thermafil, and Cold lateral condensation obturations. Materials and Methods: Thirty-six ex-tracted human lower canine teeth were instrumented to size (F3) with ProTaper rotary instruments after cutting of their crowns to the cement-enamel junction CEJ. The working length was determined for each tooth. The teeth were divided into (3) groups (10) of each and (6) teeth were used as a positive and negative control groups. The teeth were obturated with matched-taper Single-cone, Thermafil, and lateral condensation techniques. Tgadseal was used as a root sealer in this study. A die penetration method was used to evaluate the apical seal using a stereomicroscope at 40X magnification. One-way analysis of variance and Duncan's tests were used for statistical analysis. Results: The statistical anal-ysis of the results demonstrated that there was no statistically significant difference in microleakage between the lateral condensation and Thermafil groups. The matched taper single cone showed the least microleakage with a significant difference than the other two groups. Conclusions: The apical sealing ability of Matched-taper Single-cone obturation was better than the lateral condensation and Thermafil techniques when the root canal was prepared using a ProTaper rotary instrumentation.


Article
An in-vitro scan electron microscope comparative study of dentine-Biodentine interface

Authors: Jameel M. A. Sulaiman جميل سليمان --- Maha M. Yahya مها يحيى --- Wiaam M.O. Al-Ashou
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 1 Pages: 42-48
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: This research was an in-vitro SEM comparative study of Dentine – Biodentine TM interface.Materials and Methods: Sixty three freshly extracted human molars, Biodentine TM (Septodont, France), MTA (ProRoot, Tulsa, Brazil), GIC (MediFil, Promedica, Germany), light microscope, scaler and pumice, high speed hand piece, diamond bur, Scan Electron Microscope: VEGA\ Easy Probe. TESCAN – Germany. The study was performed first at the University of Mosul, College of Dentistry to dental models were brought the sixty-three of the specialty dental health center in Mosul. The teeth was prepared by cleaning, cutting, and removing all the caries and examined under light microscope and decayed teeth was excluded .Then the teeth was divided randomly into three main groups (A, B, C) and each major group was divided into three sub groups: (A1, A2, A3) was filled with (Biodentine TM), (B1, B2, B3) was filled with (MTA) and (C1, C2, C3) was filled with the (GIC). Each subset contains seven (7) samples. All groups were filled according to the manufacturer instructions, and then restored at 37°C and 100% humidity. After storage periods of (7, 14, 28) days, the teeth were sectioned mesio-distaly using a low speed diamond saw (Isomet, Buehler Ltd.), and examined under SEM at the University of Technology-Nano Research Center in Baghdad.Results: Under the condition of this in vitro study, examination with SEM showed that the marginal gaps between the experimental materials and the dentine is time dependant, with the best results was observed between Biodentine and dentine interface.Conclusion: The marginal gaps between the experimental materials and the dentine are time dependent

الأهداف : يهدف البحث إلى استخدام تقنية المجهر الاليكتروني لإجراء دراسة مقارنة للوسط البينيلمادةعاج السن الطبيعي مع المادة الصناعية المثيلة لها. المواد وطرائق العمل: ثلاثةوستون ) 36 ( عينة من الأسنان الطبيعية ، ثلاثة مواد مختلفة من الحشوات السنية ال )TM (Biodentine ، ومادتي ال (MTA) وال (GIC) ، المجهر الاليكتروني الماسح (SEM: VEGA\ Easy Probe. TESCAN - Germany) ، مجهر ضوئي ، مقحلة أسنان (Scaler) ومسحوق (Pumice) لمعالجة الأسنان، رأس قاطع من الماس، بالإضافةإلى أدواتيدوية عالية السرعة، جهاز تجفيف من الرطوبة. أجريت الدراسة أولا في جامعة الموصل كلية طب الأسنان بعد أن تم جلب نماذج الأسنان الثلاثة والستون من المركز الصحيالتخصصي للأسنان في الموصلثم بدأ العمل لتحضير العينات للعمل البحثي لتشمل التنظيف والقص وإزالة جميع التسوسات وفحصها بالمجهر الضوئي لغرض التخلص من الأسنانالمنخورة . قسمتالأسنان عشوائيا إلى ثلاثة مجاميع رئيسية وهي )(A, B, C والمجموعة الرئيسية الواحدةإلى ثلاثة مجاميع ثانوية )3,A2,A1(A لمادة ال )TM (Biodentine ،)3,B2,B1(B لمادة ال (MTA) و )3,C2,C1(C لمادة ال (GIC) . وكل مجموعة ثانوية تحتوي على سبعة (7) عينات. ثم بدأت المعالجة بالحشوات السنية المخصصة لهذه الدراسةوهي مادة ال )TM (Biodentine فرنسي الصنع من شركة (Septodont) ، ومادة ال (MTA) برازيلي من شركة Tulsa) (ProRoot, اما مادة ال (GIC) ألماني من شركة –(MediFil, Promedica) ، بعدها بدأت عميلة الخزن بالماء المقطر ولفترات زمنية مختلفة بالأيام وهي ) 7, 14, 28 ( لكل مجموعة ، ثم جففت جميع العينات بجهاز تجفيف للتخلصمن الرطوبة وتم تقطيعها ثم بعدها أرسلت للتصوير بجهاز المجهر الاليكتروني الماسح (SEM) في الجامعة التكنولوجية مركز بحوث النانوتكنولوجي في بغداد. –النتائج:أظهرت نتائج هذه الدراسة أن مقدار الفجوة الحاصلة بين عاج السن والمواد المفحوصة تعتمد على الزمن وان أفضل النتائج لوحظت بين مادة ال )TM (Biodentine وسطحعاج السن.الاستنتاجات: إن مقدار الفجوة السطحية بين المواد المفحوصة وسطح عاج الأسنان مرتبط بعامل الزمن.

Keywords

Interface --- Biodentine TM --- MTA --- SEM


Article
Sealing Ability of Biodentine as a Retrograde Filling Materials (A Comparative in vitro study)

Authors: Makdad N. Chakmakchi --- Maha M. Yahya --- Wiaam M.O. AL-Ashou
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 26 Pages: 357-361
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aim: Inadequate apical seal is the major cause of endodontic failure, the root end filling material used should prevent ingress of potential contaminants from periapical tissue. Aims: The purpose of this in vitro study was to evaluate the sealing ability of Biodentine (Septodent) when used as a root-end filling material and to compared the result with that of White Mineral Trioxide Aggregate ( MTA) and Glass Ionomer Cement (GIC). Materials and Methods: The root canals of (34) extracted human teeth were instrumented and obturated with gatta percha. Apexes were resected and cavities were prepared to 3mm depth. Teeth were divided randomly into three groups(n=10): first group was retrofilled with Biodentine, second with MTA, third group with GIC, and positive (n=2) and negative (n=2) control groups. Nail varnish was applied to all root surfaces except the tip of the root. Following immersion in basic fuchsine 1% , the roots were sectioned longitudinally and depth of dye penetration was evaluated by stereomicro-scope at 40X magnification. Data were analyzed using one way ANOVA and Duncan›s multiple range test at P< 0.05. Results: In this study, biodentine was determined to be superior than MTA and GIC prevention apical microleakage when used as root-end filling. No statistical significant difference was observed between MTA and GIC. Conclusions: under the conditions of this in vitro study, despite some variation, Biodentine provides a better seal than MTA and GIC when used as retro filling, but along term in vivo study is required to prove it

Listing 1 - 4 of 4
Sort by
Narrow your search

Resource type

article (4)


Language

English (4)


Year
From To Submit

2015 (1)

2014 (2)

2011 (1)