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Article
Bond Strength of Aluminum Oxide Surface Treatment on Sandwich Restoration

Authors: Maha A AL-Murad --- Sawsan H Al–Jubori --- Nadia H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 1 Pages: 89-95
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aim of this study is to evaluate the effect of aluminum oxide as a surface treatment on shear bond strength of etched and non-etched GIC for sandwich restoration with different types of tooth co-lored restorations .In addition, failure type was assessed. Materials and Methods: Sixty Teflon molds (5mm diameter and 4mm height) of a chemically cured GIC were prepared. They were divided into two main groups 1st control, 2 ed air-abraded with 50μm aluminum oxide particles. Both groups were sub divided into two subgroups 1st control, 2 ed etched with 37%phosphoric acid. Bonding material was applied to the treated surface of all groups and cured. The second split of Teflon mold (3mm di-ameter and 4mm height)was placed onto the prepared specimenEach subgroups (1st control, 2 nd etched with phosphoric acid) were farther subdivided into three subgroups which entrain filled as fal-low: 1st split filled with a tg microhybrid, in 2 ed split filled with tg fine glass, and in 3 rd split filled with Ceram X. Shear bond strength was measured by using Universal Testing Machine, and mode of failure examined by a stereomicroscope. Results: Anova test showed that there was a highly significant difference for all variables except acid etching effect. Aluminum oxide surface treatment displays supe-rior shear (2.280MPa). tg micro hybrid composite and Ceram X showed highest shear bond strength. Conclusions: Phosphoric acid etching did not improve shear value of sandwich restorations, while uses of aluminum oxide surface treatment, tg micro hybrid and Ceram X filling material gave an improve-ment on it. The failures were mainly cohesive within the GIC except tg fine glass was cohesive in fill-ing material itself.


Article
Repair of root canal perforation by different materials

Author: Samar Abdul Hamed سمر عبد الحميد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 30-35
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this in vitro study was to compare sealing ability of Mineral Trioxide Aggregate (MTA), Glassionomer cement (GIC) and Epiphany obturation system in repairing the iatrogenic lateral root canal perforation.Materials and Methods: Thirty freshly extracted human teeth with single and straight canals were used in this study.These teeth were cleaned and their crowns were removed at the cemento-enamel junction. The roots wereinstrumented using the step-back technique. A perforation was created on the mesial root surface at about 45-degree angle to the long axis of each root apico-coronally at the middle third by small round bur #1/2 with copiousirrigation of 2.5% NaOCL and 17% buffered solution of EDTA was used as the final rinse to remove the smear layer andto prevent the blockage of perforation. The 30 roots were divided randomly in to three groups (10 roots for eachgroup):- Group A: The root canal perforation was repaired by MTA then obturated by lateral condensationtechnique with gutta-percha and zinc oxide eugenol sealer. Group B: The root canal perforation was repaired byGIC then obturated by lateral condensation technique with gutta-percha and zinc oxide eugenol sealer. Group C:the roots were obturated with Epiphany obturation system by lateral condensation technique. The external surfacesof all roots were coated by two layers of sticky wax except the perforation site then immersed in 2% methylene bluedye for 48 hrs in incubator at 37C°. After that all roots were longitudinally sectioned for linear measurement of dyepenetration through the perforation using a stereomicroscope at X40 magnification with calibrated scale ocular grid.Results: The result showed that group A showed the lowest mean of dye leakage (0.77mm) while group C showedthe highest mean of dye leakage (4.45mm).Conclusion: Significantly less dye leakage in roots which perforations repaired by MTA than those repaired by GICand highly significant less dye leakage than those repaired by Epiphany obturation system


Article
Bond strength evaluation of two bioactive liners and glass ionomer cement, bonded to resin composite: A comparative study

Authors: Methal F. Alshaikhli مثال فاضل شاكر
Journal: AL-yarmouk Journall مجلة كلية اليرموك الجامعة ISSN: 20752954 Year: 2019 Volume: 11 th year Issue: 1 Pages: 5-12
Publisher: College Yarmouk University كلية اليرموك الجامعة

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Abstract

Aims: The mechanical properties of cements, as well as their adhesive properties, are important factors that influence the durability of restorations in the oral cavity. So the aim of this study is to compare and evaluate the bond strength of resin composite to underlying bioactive materials (Biodentine & Therecal) and conventional Glassionommer cement using single bond adhesive system and characterizing their failure modes with (10X magnification). Materials and Methods: 30 acrylic blocks containing a central hole with a 5mm diameter and a 2mm height were prepared and divided into three groups of 10 samples each based on the liner used as Group A Biodentine (BD), Group B Therecal (TLC), and Group C chemical cure glassionomer cement (GIC). The resin composite of 4 mm diameter and 2 mm height was then bonded to each sample using universal adhesive. Shear bond strength (SBS) analysis was performed at a cross-head speed of 0.5 mm/min. Statistical Analysis: Statistical analysis was performed with one-way analysis of variance (ANOVA) and least significant difference (LSD) tests were P>0.05 (Non-significant), P<0.05 (significant), P<0.001 (highly significant) using Statistical Package for the Social Sciences (SPSS) version 19.Results: The results showed that the highest mean of SBS was in group B (TLC) (21.79 Mpa). While the lowest mean of SBS was scored by group A (BD) (6.5490 Mpa). Both group B (TLC) and group C( GIC) showed a very high significant difference (p=0.000) more than group A (BD) while group B(TLC) showed a significant difference (p=0.001) higher than group C (GIC) . The observed mode of failure were predominately cohesive in group A (BD), in group B (TLC) were adhesive and mixed while group C (GIC) were shown cohesion and a mixed mode of failure Conclusions: This present study concludes that; Both TLC and GIC showed adequate bond strength to be used immediately as a direct liner beneath composite resin in single appointment. While newly set BD showed weak bond strength with composite, which mean it is better to use it in two-stage filling procedure

الغرض من هده الدراسة هي مقارنة الربط القصي بين الحشوات (الراتنجية) والمواد العازلة (البطائن) وهي: البايودنتين و الثريكال (وهما مادتان ذات نشاط حيوي) ومادة الكلاس ايونومر التقليدي.ابتدا العمل بهدا البحث بعمل (30) قالب اكريليكي يحتوي على فجوة وسطية بقطر (5)ملم وارتفاع (2)ملم, قسمت الى ثلاثة مجاميع وكما يلي:1)المجموعة الاولى (A): ملئت بمادة البايودنتين.2)المجموعة الثانية (B): ملئت بمادة الثريكال.3)لمجموعة الاولى (C): ملئت بمادة الكلاس ايونومر التقليدي.بعد ذلك تم طلي الفجوات المملوئة بالمواد السنية العازلة(البطائن), بالمادة السنية الرابطة (نظام الربط العام), وبعد تصلبه (باستعمال الجهاز الضوئي) وضع الراتنج في وسط المواد التي ملئت الفجوات ولجميع العينات باستعمال انبوب بلاستيكي بارتفاع (2)ملم وبقطر (4)ملم , ثم تم تصليب الراتنج لمدة (20) ثانية باستعمال الجهاز الضوئي التصلبي.لقد تبين من النتائج الاحصائية, ان قوة الربط القصي لمادة الثريكال هو الاعلى (وجود فرق احصائي كبير).بينما كانت قوة الربط القصي لمادة البايودنتين هو الاقل احصائيا. كما اوضحت النتائج الاحصائية بان قوة الربط القصي في مجاميع الثريكال ومجاميع الكلاس ايونومر هي اعلى بكثير من مجاميع البايودنتين , بينما كانت مجموعة الثريكال (B) اعلى احصائيا من المجموعة (C) الكلاس ايونومر وكما يلي:1.مجموعة (B) هي اعلى بكثير من مجموعة (A).2.مجموعة (C) هي اعلى بكثير من مجموعة (A).3.مجموعة (B) هي اعلى من مجموعة (C).

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