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Article
Effect of different partial ferrule locations on the fracture resistance of endodontically treated teeth restored with fiber posts and complete crowns

Author: Haider Hasan Jasim.
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2016 Volume: 4 Issue: 1 Pages: 39-49
Publisher: Tikrit University جامعة تكريت

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Abstract

Purpose. The purpose of this in vitro study was to evaluate the effect of partial ferrule locations on the fracture resistance of endodontically treated maxillary canines restored with complete crowns. Material and Methods. Fifty extracted maxillary canines were sectioned 18 mm from their apices, endodontically treated, and divided into 5 groups of 10 teeth each. All groups were prepared with full shoulder crown preparations. the first group having axial wall heights of 2 mm around the preparation circumferences, the axial walls were circumferential, 360 degrees around the preparations (Complete group), the second, third, and forth groups the axial walls were continuous for 180 degrees (one half of the axial tooth structure) of Palatal, Labial, and Proximal groups, and the fifth group all axial tooth structure was sectioned to the level of the preparation shoulder (Level group). All prepared teeth were then restored with quartz fiber posts (RTD), composite resin (Multicore) cores, and complete metal crowns. The fracture resistance was measured in a universal testing machine at 135 degrees to the long axis of the tooth until failure. Data were analyzed by ANOVA and then by Least Significance Difference test (LSD). The mode of failure was determined by visual inspection of all specimens. Results. Significant differences (P<0.05) were found among the mean fracture loads of the test groups, and was 803.7 N, 747.7N, 347.3 N, 386.6 N, and 186.7N for the Complete, Palatal, Labial, Proximal, and Level groups, respectively. When the mode of failure was evaluated, all failure was an oblique palatal to facial root fracture for the groups with remaining coronal tooth structure. In the Level group, post debonding was the predominant mode of failure. Conclusion. The palatal axial wall was more effective than the labial or proximal axial wall in providing fracture resistance to force applied to the palatal aspect in endodontically treated teeth.


Article
Evaluation of resin reinforced glass ionomer and packable composite resin used for reinforcement of weaken endodontic canals
تقييم حشوات الزجاج المتماثر و حشوات الراتنج المركب القابلة للانضغاط في تدعيم قنوات جذور الأسنان المضعفة

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Abstract

Background: When the weakened root is internally rebuilt with suitable adhesive dental materials, the root is dimensionally and structurally reinforced to support and retain a post and core for continued function of the tooth. Objective: To evaluate the effect of reinforcement of weakened endodontically treated teeth with packable composite resin (Filtek P60™, 3M, USA) and resin reinforced glass ionomer restorative material (riva light cure, SDI, Australia) on retention of light-transmitting glass fiber post (FRC postec plus, Ivoclar Vivadent, USA) in comparison with weaken endodontic treated teeth that restored with custom cast post without reinforcement. Materials and Methods: Specimens divided to three groups in which group A represent control group and the other groups represent the experimental groups. Ten samples made from each group giving thirty samples. All samples were stored in deionized distilled water in constant temperature at 37 Cº for 24 hr. Retention of post was measured with tensile strength in instron testing machine (ISO TR 11405,2003) with cross head speed of 0.5mm/min. The samples were pulled-out until dislodgement of post from post hole. Tensile strength was recorded in newton unit (n) for each sample. ANOVA One-way test and student–t test were used to analyze the results and to show the comparison of significance.Results: There was increase in retention values in group B (samples reinforced with packable composite) and group C (samples reinforced with resin reinforced glass ionomer) when compared with control group (group A) that used custom cast without reinforcing the canal post. Also the retentive values of (group B) were higher than (group C). Conclusion: Reinforcement of weakened endodontically treated teeth with either packable composite resin or resin reinforced glass ionomer restorative material lead to significant increase in the bond strength of fiber optic post. With greater retentive value for packable composite

خلفية الدراسة: ان التدعيم الداخلي بمادة سنية لاصقة لجذور الاسنان المضعفة يؤدي الى تقويتها وبالتالي يحافظ على قوة وثبات الوتد داخل الجذر, كذلك يحافظ على قوة وثبات الاساس الخارجي الذي تبنى عليه الحشوة النهائية.أهداف الدراسة: لتقييم تاثير تدعيم جذور الاسنان المضعفة والمعالجة لبيا بواسطة حشوات الراتنج المركب ذو خاصية الانضغاط وراتنج الزجاج المقوىالمتماثر على ثبات الوتد الزجاجي بالمقارنة مع الطريقة الاعتيادية.المواد وطرائق العمل: قسمت العينات الى ثلاث مجموعات هي المجموعة (ا) التي تمثل المجموعة الظابطة والمجموعات الاخرى تمثل المجموعات التجريبية (ب و ج) بواقع عشر عينات في كل مجموعة. تم تخزين جميع العينات في الماء المقطر بدرجة حرارة ثابتة عند 37 درجة مئوية لمدة 24 ساعة. تم قياس قوة الشد بواسطة جهاز الانسترون حيث تم سحب العينات لحين خلع الوتد من داخل الجذروسجلت قوة الشد بوحدة النيوتن (ن). تمت المقارنة بيت العينات باستخدام اختبار تحليل التباين واختبار (ت).النتائج: اظهرت النتائج زيادة معنوية في قيم الشد لعينات المجموعتين ب و ج بالمقارنة مع المجموعة ا. بالاضافة الى ذلك كان التدعيم بواسطة الراتنج المركب (مجموعة ب) افضل معنويا من التدعيم بواسطة راتنج الزجاج المقوى المتماثر (مجموعة ج).الاستنتاجات: تدعيم الجذور المضعفة بواسطة حشوة الراتنج المركب ذو خاصية الانضغاط او بواسطة حشوة الزجاج المقوى المتماثر يؤدي الى زيادة قوة ثبات الوتد الزجاجي مع ثباتية افضل عند استخدام حشوة الراتنج المركب ذو خاصية الانضغاط.


Article
Apical microleakage in root canals obturated with lateral compaction, warm vertical compaction and Gutta-Flow techniques (in vitro study)

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Abstract

The sealing ability of root canal filling materials is crucial to the goal ofpreventing reinfection via microleakage of microorganisms and their by-products.Thirty palatal canals of 12mm length from extracted upper first molars were selectedthen instrumented and divided into 3 groups. Group I was obturated with lateralcompaction technique, group II was obturated with warm vertical compactiontechnique and group III was obturated with Gutta-Flow system. Except for the apical2 mm, all other segments of roots for the 3 groups received two layers of nail varnishand immersed in a methylene blue 2% and stored at 37Cº for 30 days. Understereomicroscope liner dye leakage was measured. No statistical difference was foundbetween lateral compaction, warm vertical compaction and Gutta-Flow sealing ability.

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