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The influence of flowable composite liner on microleakage of class II packable composite resin restoration with different application techniques (Comparative study)

Authors: Jalal B. Al-Kalamchi جلال الكلامجي --- Luma M. Baban لمى بابان
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 4 Pages: 19-24
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This in vitro study was conducted to evaluate and compare the influence of flowable composite anddifferent application techniques of class II packable composite restoration on dentinal leakage.Materials and methods: Thirty human freshly-extracted Maxillary premolars were selected for this study. ConventionalClass II MOD cavities were prepared in the sample teeth which were then divided into five groups .Each groupconsist of ten boxes either MO or DO according to the restorative procedure used except group A which consist oftwenty boxes(ten teeth with MOD amalgam restoration). Group A: ten teeth where restored by amalgam- (SDIAustralia) high strength admix amalgam type.Group B: ten teeth in which the mesio-occlusal (MO) sides wererestored by {adhesive + flowable composite + one bulk packable composite (Filtek P60)}. Group C: ten teeth inwhich the disto-occlusal (DO) sides were restored by {adhesive +one bulk packable composite, (Filtek P60)}.Group D:ten teeth in which the mesio-occlusal (MO) sides were restored by {adhesive + flowable composite + successivebuild up technique for packable composite, (Filtek P60)}. Group E: ten teeth in which the disto-occlusal (DO) sideswere restored by {adhesive+ successive build up technique for packable composite, (Filtek P60)}. Afterthermocycling and immersion in 2% methylene blue, the teeth were sectioned longitudinally mesio-occluso-distaland dye penetration was evaluated using a stereomicrscope, microleakage was recorded in mm.Results and Conclusions: ANOVA test and least significant difference (LSD) test were used to analyze the results, andthe results showed that the use of flowable composite resin as a liner with packable composite resin decreases theamount of dentinal microleakage, and the restorative technique of packable composite whether it is bulk build uptechnique, or incremental successive build up technique has no difference on the improvement of microleakgevalue, and the packable resin composite restoration whatever applied with different application techniques orrestored with or without flowable composite it still had or scored higher microleakage than amalgam restoration


Article
Microleakage of class II packable resin composite lined with flowable composite and resin modified glass ionomer cement: An in vitro study

Authors: Haitham J. AL-Azzawi هيثم العزاوي --- Nagham A. AL-Hyali نغم الحيالي --- Firas J. M. Al-Dabbagh فراس الدباغ
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: special issue 1 Pages: 6-10
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Packable composites most commonly used as posterior restorative materials, however, disadvantageslike polymerization shrinkage limited their use, so the aim of this an in vitro study was to investigate the microleakageof posterior packable composite(Filtek™ P-60) using different liner materials; flowable resin composite(Filtek™ Flow)and resin modified glass ionomer cement (Vitrebond TM 7150) using open sandwich technique at the proximal box ofclass II preparation located above the cemento-enamel junction (CEJ)in enamel.Materials and Methods: Twenty four recently extracted human upper premolars were prepared with standardizedClass- II cavities as follows; Occlusal Outline Form: 2mm in bucco-lingual width and 1.5 mm in depth measured fromocclusal fissure to pulpal floor. Proximal Boxes: The depth of the proximal box from the proximal cavo-surface marginto the axial wall was 2mm, so as the bucco-lingual width (2mm). The proximal box margin located 1 mm coronal tothe CEJ (in enamel). The teeth were assigned into 3 groups (n=8): Group-I (control): acid etching (H3PO4) + bondingagent (Adoper Single Bond 2 Adhesive) + posterior packable composite (Filtek™ P-60), Group-II (RMGIC): acidetching + resin modified glass ionomer cement (Vitrebond TM 7150) + posterior packable composite; Group-III(Flowable): acid etching + bonding agent + flowable composite (Filtek™ Flow) + posterior packable composite.The teeth were immersed in distilled water at 37ºC for 24 h., then thermocycled (1000X, 5°-55°C, 30 sec. dwell time)and immersed in 1% methylene blue solution for 24 h., after that the teeth were sectioned longitudinally in mesiodistaldirection and dye penetration in millimeters were measured in each cavity by using stereomicroscope. Dataobtained were analyzed using ANOVA and LSD tests at 0.05 significance level.Results: The microleakage of posterior packable composite (group-I) significantly (P<0.05) decreased by the twoliners used (group-II and group-III), but there is no statistically significant differences (P>0.05) in enamel microleakagein respect to dye penetration were detected between the two liners used (group-II and group-III), with theassociation flowable composite Filtek flow (group-III) showing the best results.Conclusion: The use of flowable composite (Filtek™ Flow) and resin modified glass ionomer(Vitrebond TM 7150) in theopen sandwich technique decrease the microleakage of posterior packable composite(Filtek™ P-60) with marginlocated in enamel surface and better results with flowable composite


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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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.

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