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Article
Effect of three types of mouth rinses and human saliva on microhardness of packable and nanocomposite resins (In vitro study)

Authors: Nagham A. Al-Hyali نغم الحيالي --- Haitham J. AL-Azzawi هيثم العزاوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 25-29
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The purpose of this an in vitro study was to evaluate and compare the influence of three types ofmouth rinses (alcohol- containing, alcohol-free and chlorhexidine-containing mouth rinses) and human saliva onmicrohardness of two types of composite resins (packable and nanofilled composite).Materials and Methods: Total numbers of 64 specimens were prepared, using molds specially fabricated for this studyand divided according to type of composite resins used, into two groups: 32 specimens made from packable P60and 32 specimens made from Filtek Supreme XT nanocomposite. Then each 32 specimens subdivided into 4subgroups according to treatment solutions used (Listerine, oral-B, chlorhexidine containing mouth rinses and saliva).The specimens of each subgroup was immersed, after curing, in distilled water for 24hr at 37°C then subjected tomicrohardness measurement for baseline readings determination using Vickers microhardness tester. Then eachsubgroup was immersed in 20 ml of treatment solutions and incubated at 37°C for 24 hr and re-subjected tomicrohardness measurement. The change in hardness value was calculated for each sample. The resulting datawere statistically analyzed using ANOVA and t- test at 0.05 significance level.Results: The results revealed that, all mouth rinses tested decreased the hardness of both tested resin-composites andnon significant reduction in microhardness with saliva.Conclusion: Both alcohol-containing & alcohol-free mouth rinses cause, highly significant reduction in microhardnessof composite resins while saliva causes non significant reduction in microhardness. Chlorhexidine-contaianing mouthsrinses highly significant decrease the hardness of nanocomposite and significantly decrease the hardness ofpackable composite.

اجریت ھذه الدراسةِ المختبریة لتَقییم ومُقَارَنَة تأثیرِ ثلاثة أنواع من غسول الفم (یحتوي على الكحول، خالي م ن الكح ول، وغس ول ف م یحت وي عل ى الكلورھكس د ین) ولع اب الإنس ان عل ى( Filtek P وراتنج مركّب قابل للتراص 60 Filtek Supreme XT الصلادة المجھریة لنوعین مِنْ أنواعِ الراتنج المركب (مركب نانوالأعداد الكلیّة مِنْ 64 نموذجِ ھُیّأتْ، بأستخدام قالب صنع خصیصا لھذه الدراسة، وقُسّمتْ حسب نوع الراتنج المركب المستخدم إلى :Filtek Supreme XT 32 عینة من مركب نانو vFiltek P 32 عینة من مركب قابل للتراص 60 vثمّ كُلّ 32 نموذج قسّمتْ إلى 4 مجامیع فرعیةِ طبقاً لمحالیل المعالجةِ المستعملة : -.(Listerine) 8 نماذج غَطستْ في 20 ملیلترِ مِنْ : مجموعة فرعیة 1.(Oral-B) 8 نماذج غَطستْ في 20 ملیلترِ مِنْ : مجموعة فرعیة 2( Corsodyl mint) 8 نماذج غَطستْ في 20 ملیلترِ من : مجموعة فرعیة 38 نماذج غَطستْ في 20 ملیلترِ لعابِ غیرِ مُحَفَّزِ إنسانيِ. : مجموعة فرعیة 4كل مجموعة فرعیة من النماذجِ غُمِرتْ بعد التصلب في الماءِ المُقَطَّرِ ل 24 ساعة عند 37 درجة سلیلیزیة ثمّ تخضع لقیاس الص لادة المجھری ة لتص میمِ الق راءاتِ الاولی ة باس تخدام ف احصِالصلادة المجھریة ڤكرز مایكرومیت. بعد ذلك، تغمر كُلّ مجموعة فرعیة في 20 ملیلترِ مِنْ محلول المعالج ةِ المُخَصَّ صِ وتحف ظ ف ي 37 درج ة س لیلیزیة ل 24 س اعة وتخض ع ث انی ة لقی اس.t و اختبار (LSD) اختبار الفرق المعنوي ، (ANOVA) الصلادة. التغیر في قیمة الصلادة المجھریة تحسب لكل عینة وتحلل البیانات الناتجة احصائیا باستخدام اختبار تحلیل التباینلك ن . Filtek Supreme XT و Filtek P كَش فتْ النَت ائِج ب أنّ ك لا غس ول الف م الح اوي عل ى الكح ول والغس ول الخ الي م ن الكح ول یس ب بان نقص ا احص ائیا ھام ا ج دا ف ي ص لابة 60بش كل احص ائي ھ ام . ام ا اللع ابُ فیس بب Filtek P وی نْقصُ ص لابة 60 Filtek Supreme XT غسول الفم الحاوي على الكلورھیكسیدین یسبب نقصا احصائیا" ھام ا ج دا ف ي ص لابةنقصا في الصلابة المجھریة لكلا النوعین لكنھ إحصائیا غیرَھام.كش فت النت ائج اخ تلاف احص ائي ھ ام ج دا ب ین مج امیعھم الفردی ة ف ي تغی ر الص لابة المجھری ة ، ، t بواس طة اختب ار Filtek Supreme XT و Filtek P عن دما قارن ا ب ین 60.Filtek


Article
Comparison of regional bond strength among different types of posts luted with different types of cement

Authors: Ahmed A. Al-Jumaily احمد الجميلي --- Haitham J. Al-Azzawi, هيثم العزاوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 1 Pages: 1-6
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This in vitro study was carried out to investigate the effect of post space regions (coronal, middle and apical), the effect of post types ( Manually Milled Zirconia post, Prefabricated Fiber post, prefabricated Zirconia post) and the type of cement used (GIC, self-adhesive resin cement) on the bond strength between the posts and root dentin by using push-out test.Material and methods: Forty eight mandibular premolars extracted for orthodontic reasons (single rooted) were instrumented with ProTaper system (hand use) and obturated with gutta percha for ProTaper using AH26® root canal sealer following the manufacturer instructions. After 24 hours, post space was prepared using Zirix and Glassix drills no.3 creating 8 mm depth post space. The prepared samples were randomly divided into three main groups (16 samples each) according to the type of post used (Group A. Manually Milled Zirconia post, Group B. Prefabricated Fiber post and Group C. Prefabricated Zirconia post) .each group was subdivided into two subgroups (each subgroup contains 8 samples) according to the type of cement used (subgroup A1.Manually Milled Zirconia post cemented with GIC, subgroup A2.Manually Milled Zirconia post cemented with Speed cem),( subgroup B1.Prefabricated Fiber post cemented with GIC, Group B2. Prefabricated Fiber post cemented with Speed cem) and (subgroup C1.Prefabricated Zirconia post cemented with GIC, subgroup C2. Prefabricated Zirconia post cemented with Speed cem), after cementation and incubation for 24hrs, at 37°c and 100% humidity. Each root was sectioned horizontally into 3 slices (2 mm in thickness) representing the coronal, middle and apical regions of the post space. Push out bond strength test was performed and measured using a universal testing machine (Tinius-Olsen) at across head speed of 0.5 mm/min.Results: The results showed that regarding the root region, the bond strength values increased significantly from apical to coronal region for all types of posts in both tested cements. For the effect of post type, the manually Milled Zirconia post cemented with the self-cured resin cement (Speed cem) showed higher bond strength values. For type of cement, the self-adhesive resin cement (Speed cem) showed higher bond strength values.Conclusions: the retention of post restoration was affected by root region, type of post and type of cement used


Article
Assessment of the effectiveness of the manufactured chemo-mechanical caries removal on caries removal

Authors: Musab H. Saeed مصعب سعيد --- Haitham J. Al-Azzawi هيثم العزاوي --- Amer M. Al-Ani امير العاني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 2 Pages: 1-4
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Chemo mechanical caries removal systems has been discussed as an alternative to conventional caries removal. This study assesses the efficacy of a chemo- mechanical caries removal technique in caries removal.Material and methods: Forty five decayed extracted human teeth were used in the present study. After initial opening through the enamel, different concentrations of the chemo-mechanical caries removal solution were placed in the cavity and excavation of the caries was performed.Results: After probing and visual inspection, with the use of the DIAGNOdent caries detecting device, and after histological examination, the concentrations of 0.5% and 0.7% were shown to be equally effective in removal of caries and more potent than the 0.2% concentration.Conclusion: 0.5 % concentration of the manufactured chemo- mechanical caries removal is the optimal concentration that can be used in dentinal caries removal.


Article
Histopathological examination of the chemomechanical caries removal effect on the human pulp

Authors: Musab H. Saeed مصعب سعيد --- Haitham J. Al-Azzawi هيثم العزاوي --- Amer M. Al-Ani امير العاني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 2 Pages: 21-23
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Chemo mechanical caries removal systems have been discussed as an alternative to conventional caries removal. This study examines the effect of the chemo- mechanical caries removal material on the human pup.Material and methods: Forty eight maxillary first premolars from twenty four patient ( 18 male and 6 male) were studied and selected from patients need orthodontic treatment .class V cavity was done in each tooth and the material put inside the cavity for 20 sec, the extraction procedure done after 20minutes, 24 hours and 4 days .Results: The histological examination of 0.5 % Chemo-mechanical caries removal at the three periods showed that there is no significant effect on the pulp of the tooth.Conclusion: 0.5 % concentration of the manufactured chemo- mechanical caries removal can be used in dentinal caries removal safely with out any adverse effect on the pulp


Article
The shear bond strength of an immediate and delay repaired light-cure composite restoration (In vitro study)

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Abstract

Background: Defects in composite resin restoration whether discovered at the time of placement or associated withold composite resin restoration could be repaired without replacing the entire restoration. This in vitro study wasconducted to determine and compare the shear bond strength of an immediate and delay repaired light curedcomposite restoration.Materials and methods: Eighty acrylic blocks (25x25x15 mm) were constructed from cold cure acrylic resin; each onecontained an acrylic hole (6mm diameter and 3mm depth) that filled with Helioprogress composite resin. The surfacelayer of the composite resin samples was light cured through plastic strip, abraded by finishing discs and rinsed withdeionized distilled water for 15 sec. The eighty specimens were divided randomly into two groups according to thestorage time in deionized distilled water before the repair:Group I: Stored for 15 min. (Immediate repair group)Group II: Stored for 1week. (Delay repair group)Both groups were subdivided into 4 subgroups according to the surface treatment they received:Subgroup 1: No surface treatment (control)Subgroup 2: 37% phosphoric acid etchant (15 sec.)Subgroup 3: Heliobond (light activated for 20 sec.)Subgroup 4: 37% phosphoric acid and Heliobond.Repair was done by using a standardized translucent plastic straw (3mm diameter and 6mm length) and was filledHelioprogress composite resin and light cured for 40 sec. in four directions. All the specimens were stored in deionizeddistilled water for 24 hr. testing was done by the Zwick testing machine by applying shearing force with speciallydesigned chisel-shape rod. Data obtained were statistically analyzed using analysis of variance test and t-test.Results: The results showed very highly significant difference between the similar subgroups in group I vs. group II andthere was non-significant difference between subgroup 1 vs. 2 and between subgroup 3 vs. 4.Conclusion: Delaying the repair procedure for 1 w resulted markedly reduced the bond strength, the surfacetreatment with 37% phosphoric acid slightly reduced the bond strength in the immediate repair while slightlyincreased it in the delay repair, Furthermore, the surface treatment with Heliobond fifth generation bonding agentmarkedly increased the bond strength in both repairs.

Keywords

Repair --- composite --- shear bond


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

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