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Article
Shear bond strength of endodontic sealers to dentin with and without smear layer and gutta percha (An in vitro study)

Authors: Rana Kadhim Hasan رنا كاظم حسن --- Majida K. Al-Hashimi ماجدة الهاشمي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 4 Pages: 86-89
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The bond strength of root canal sealers to dentin and gutta-percha seems to be an important propertyfor maintaining the stability of root canal filling, which potentially influences both leakage and root strength. Theobjective of this, in vitro, study was to evaluate the shear bond strength of three different endodontic sealers (Gutta-Flow, AH Plus, Apexit Plus) to dentin, in the presence and absence of the smear layer and gutta percha.Material and Methods: After slicing off the occlusal 2mm of 60 extracted human maxillary premolar teeth, theexposed dentin served as the tested surfaces; the teeth were fixed with cold cure acrylic, and were divided into twogroups according to the smear layer presence, group A without smear layer, when dentin surfaces were irrigatedwith EDTA 17% followed by distilled water then subdivided into 3 subgroups according to the type of sealer used;group B when dentin surfaces were washed with distilled water only, then subdivided into 3 subgroups. Thirty samplesof gutta-percha were prepared and named as group C which was subdivided into 3 subgroups. Five mm longsection of polyethylene tubes were placed on the dentin or gutta percha surfaces and filled with freshly mixedsealer. After one week, all the samples were tested for shear bond strength by the Instron Universal Testing Machineat a cross head speed of 0.5 mm/min. The data was calculated in MPa and was statistically analyzedResult: There was a highly significant difference in the shear bond strength (P < 0.05) in comparison among the testedgroups, GuttaFlow showed non-significant difference in bond strength to dentin with and without smear layer, whileAH Plus and Apexit Plus showed a high significant difference.Conclusions: AHPlus showed the highest shear bond strength in all the tested samples, while GuttaFlow was the least.Additionally, AH Plus and Apexit Plus shear bond strengths were affected by the smear layer removal, whileGuttaFlow was not.

صیة مھمة للحفاظ على ثبات حشوة قناة الجذر الذي بدوره یؤثرعلى تسرب و قوة الجذر. Gutta-percha أن لقوة الرابطة لسدادات قناة الجذرالى عاج السن وو عاج السن بوجود اوعدم (AH Plus, Gutta-FlowApexit Plus,) كان الغرض من ھذه الدراسة تقییم قوة الترابط القصي بین ثلاثة انواع من السدادات اللبیة المختلفةبعد قطع 2ملمیتر من تاج 60 سن من أسنان الإنسان(الضواحك العلیا) . تم تثبیت الأسنان في مادة الاكریلیك ، و قسمت .Gutta-percha و ال Smear layer وجود طبقة ال.Smear layer الى مجموعتین وفقا لوجود طبقة ال(AP-) %17 یلیھ الماء المقطر وقسمت إلى 3مجموعات فرعیة وفقا لنوع السدادة المستعملة EDTA على سطح عاج السن مع غسل بمادة Smear layer المجموعة (أ) بدون.D, AH-D, GF-D. APD-S, AHD-S, GFD-S)( المجموعة (ب) غسل سطح عاج السن بالماء المقطر فقط ثم قسمت إلى 3 مجموعات فرعي.(AP-G, AH-G, GF-G) أعدت لتكون المجموعة (ج)وقسمت إلى 3 مجموعات فرعیة (Gutta-percha) ثلاثونعینة مناختبار قوة الرابط القصي تم بعد اسبوع . . Gutta-percha استعمل انبوب بطول 5 ملم من البولي اثیلین بسداده مخلوطة حدیثا ووضع على سطح عاج السن أو السجل فرق معنوي غیر ملحوظ في قوة الترابط مع عاج السن بوجود Gutta-Flow. تم حساب البیانات بوحدة المیغا باسكال و تم تحلیلھا إحصائیاً . أظھرت النتائج فرقا معنویا كبیراسجلوا فرقاً معنویاً عالیاً. Apexit Plus و AH Plus بینما Smear layer اوعدم وجود التأثرت Apexit plus و AH Plus الاقل بینھم . وقوة الربط القصي لل Gutta-Flow اظھر اعلى قوة ربط قصي في جمیع العینات بینما كان AH Plus : الاستنتاج النھائيفلم تتأثر.


Article
Push Out Bond Strength of GuttaFlow 2, Thermafil and Guttacore (An Invitro Study)

Authors: HaidarT.F. Elmuttalibi --- Jamal Aziz Mahdi
Journal: Journal of Oral and Dental Research مجلة طب الفم والاسنان ISSN: 23106417 Year: 2019 Volume: 6 Issue: 1 Pages: 7-16
Publisher: Iraqi Association for Oral Research الجمعية العراقية لبحوث طب الفم

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Abstract

Background Several root canal filling materials and techniques have been developed and studied, aiming to completely fill the root canals, their ramifications, and any anatomical variations, which are frequently observed. The objective is to investigate the push out bond strength of three different obturation materials GuttaFlow 2, Thermafil and GuttaCore at different levels. Materials and methods thirty extracted upper molars were collected and the palatal roots were sectioned at the CEJ of the tooth. The platal roots were instrumented with Hyflex CM rotary files to the size of 40/0.06. The instrumented samples were divided into three groups of ten samples each, the first group was obturated with GuttaFlow 2, the second group was obturated with Thermafil and the third group was obturated with GuttaCore obturating materials. After an incubation period of 7 days, each sample were sectioned into three sections of 2 mm thickness (apical, middle, coronal), each slice then introduced to the push out testing using a universal testing machine at a cross head speed of 0.5 mm/min.Results it showed Push-out bond strengths were significantly higher when canals were filled with GuttaCore than those filled with Thermafil and GuttaFlow 2. And Thermafil showed a higher significant difference than the GuttaFlow 2. It also showed that the bond strength values decreased from the coronal to the apical direction. Conclusion The thermoplasticized gutta-percha appears to achieve higher push out bond strength values than the cold flowable gutta-percha. With GuttaCore showed higher push out bond values than Thermafil.


Article
Comparative evaluation of the radiographic density of GuttaFlow® 2 in different obturation techniques using Spiral Computed Tomography

Authors: Nagham A. AL-Hyali --- Ala,a Jawad Kadhim
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2018 Volume: 30 Issue: 4 Pages: 8-14
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Ideal root canal obturation depends on many factors; one of them is good sealing of root canal without pores. The aim of this study was to determine the radiographic density of GuttaFlow® 2 with different obturation techniques using spiral computed tomography.Materials and Methods: Forty palatal roots of permanent maxillary first molar were used in this study. Following working length determination, root canal was prepared using rotary PROTAPER universal system. They were randomly divided into four groups of 10 roots each, the groups are Conventional lateral condensation with Apexit Plus sealer, Conventional lateral condensation with GuttaFlow® 2 as a sealer, Soft Core Regular with GuttaFlow® 2 as a sealer and single cone with GuttaFlow® 2. The experimental roots were then analyzed in both horizontal and vertical sections from the apex to coronal using Spiral Computed Tomography. The obtained data were analyzed using one-way ANOVA and Tukey tests at a level of significance of 0.05.Results: Statistical analysis showed highly significant differences among the different areas (apical, middle and coronal) of each group. The density of obturation systems decreased in the following sequence: single cone with GuttaFlow® 2 (highest density), Soft Core Regular, Conventional lateral condensation with GuttaFlow® 2 as a sealer and finally Conventional lateral condensation with Apexit Plus sealer (lowest density)Conclusion: None of the tested obturation techniques can achieve ideal three-dimensional dense obturation. Single . 2 shows the best results


Article
Evaluation of Density and Homogeneity of Three Different Root Canal Obturation Techniques: A Three –Dimensional Computed Tomography In Vitro Study

Author: Ahmed S. Mustafa
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2014 Volume: 3 Issue: 1 Pages: 17-23
Publisher: Tikrit University جامعة تكريت

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Abstract

The aim of this in vitro study was to compare three dimensionally the density and homogeneity of cold lateral compaction, warm vertical compaction and guttaflow root canal obturation techniques using computed tomography. Thirty canals of 12 mm from extracted lower single canal premolars were selected then instrumented and divided randomly into 3 groups with 10 roots in each group. Group I was obturation with cold lateral compaction technique, group II was obturated with warm vertical compaction technique and group III was obturated with guttaflow system. The specimens were then analyzed for the density and homogeneity in both vertical and horizontalsections in apical, middle and coronal third with 1 mm section thickness using computed tomography. The data obtained in hounsefield units were subjected to statistical analysis. In conclusionguttaflow was superior in the apical part and none of the tested obturation techniques can achieve three dimensional dense and homogenous obturation from apical to coronal parts of root.

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