research centers


Search results: Found 4

Listing 1 - 4 of 4
Sort by

Article
Fracture strength of laminate veneers using different restorative materials and techniques (A comparative in vitro study)

Authors: Abeer Gh. Abdul Khaliq --- Inas I. Al-Rawi ايناس الراوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 4 Pages: 1-8
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Esthetic correction represents one of the clinical conditions that required the use of laminate veneers inpremolars region. Aim of the study: The purpose of this study was to evaluate the fracture strength of the laminateveneers in maxillary first premolars, fabricated from either composite (direct and indirect techniques) or ceramicCAD/CAM blocks.Materials and Methods: Fifty sound human maxillary premolar teeth were used in this in vitro study. Teeth weredivided randomly into one control group and four experimental groups of ten teeth each; Group A: Restored withdirect composite veneer (Filtek Z250 XT), Group B: Restored with indirect composite veneers (Filtek Z250 XT), Group C:Restored with lithium disilicate ceramic CAD/CAM blocks (IPS e. max CAD) and Group D: Restored with resin nanoceramic CAD/CAM blocks (Lava Ultimate Restorative). Standard preparations were done using Ceramic Veneer Set(Komet). Indirect laminate veneers were cemented with the Relyx Veneer Cement (3M ESPE) and all specimenswere stored in distilled water at 37°C for 2 weeks. The load was applied on the occlusal part of the veneer at 45˚ tolong axis of the tooth using universal testing machine. Results were analyzed with one-way ANOVA and LSD tests.Specimens were examined by stereomicroscope at a magnification of 20x to evaluate the mode of failure.Results: Control group showed higher mean of fracture strength with highly significant difference in comparison tothe experimental groups (P<0.01). (Group A) showed higher mean of fracture strength with statistically significantdifference in comparison to (Group B and Group D). On the other hand the difference between (Group A andGroup C) was statistically highly significant. Statistically non-significant difference was found among the threeindirectly restored groups.Conclusions: All veneers used in this study can be considered as acceptable treatment in the premolars region forpatients with normal biting force. Direct composite veneer is the most favorable technique in term of fracturestrength, while IPS e. max CAD laminate veneers were least likely to fracture and most likely to completely debond

یمثل التصحیح التجمیلي واحدة من الحالات السریریة التي تتطلب استخدام القشور التجمیلیة في المنطقة الضواحك العلویة. الغرض من ھذه الدراسة كان لتقییم قوة كسر القشور.CAD / CAM التجمیلیة في أسنان الضواحك, مصنوعة من المواد المركبة أو من قوالب السیرامیك باستخدام ثلاثة طرق مختلفة: المباشرة, الغیر المباشرة و باستخدام تقنیة التم اختیار خمسین سنا من الضواحك العلویة لاشخاص بالغین ، تم تقسیم الأسنان بشكل عشوائي في خمس مجامیع؛ مجموعة قیاسیة و أربع مجموعات تجریبیة (عشرة أسنان لكلالمجموعة (ب): رممت ,(Filtek Z250 XT, 3M ESPE) منھم)؛ المجموعة (أ) :رممت باستخدام القشور التجمیلیة مصنوع من المادة المركبة بصورة مباشرة على الاسنانالمجموعة (ج): رممت باستخدام القشور (Filtek Z250 XT, 3M ESPE) باستخدام القشور التجمیلیة مصنوع بطریقة غیر مباشرة على قالب الحجر باستخدام المادة المركبةو المجموعة (د): رممت باستخدام قشور تجمیلیة مصنوعة من قوالب (IPS e. max CAD, Ivoclar Vivadent) التجمیلیة المصنوعة من قوالب سیرامیك اللیثیوم ثنائي السیلیكاتCEREC inLab ) CAD / CAM في المجموعتین (ج و د), تم صناعة القشور التجمیلیة باستخدام تقنیة ال .(Lava Ultimate Restorative, 3M ESPE) راتنج نانو سیرامیكتم تثبیت تعویضات .(Ceramic Veneer Set) 4.02 )..وقد تم عمل التحضیرات القیاسیة ( داخل المینا) لكل الاسنان في المجامیع التجریبیة باستخدام , milling system, Sironaلمدة اسبوعین ˚ المتصلب بالاشعة الضوئیة وخزنھا بالماء المقطر بدرجة حرارة 37 (Relyx Veneer Cement) القشور التجمیلیة الغیر مباشرة باستخدام السمنت المركب الرانتیجيLSD ) واختبار اقل فرق معنوي (ANOVA) تم تحلیل النتائج احصائیا باستخدام اختبار .(Universal testing machine) قبل اجراء فحص قوة الكسر باستخدام جھاز الاختباروقد تم فحص العینات الفاشلة تحت المجھر لتحدید نمط الفشل. في الختام استنتادا الى نتائج ھذه الدراسة, یمكن استخدام القشور التجمیلیة للاسنان الضواحك العلویة ولكن .(testاستخدامھ للمریضمع خطأ في أداء الوظیفة الاطباقیة ینبغي تقییمھبعنایة. القشور التجمیلیة المصنوعة من المركب الراتنیجي بالطریقة المباشرة ھو الأسلوب الأكثر ملاءمة من حیث قوةالكسر في الضواحك.


Article
The influence of CAD/CAM ceramic and heat processed composite inlays on the fracture resistance of premolars (An in-vitro study)

Authors: Huda A. Abdullah هدى عبد الله --- Inas I. Al-Rawi ايناس الراوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 4 Pages: 14-18
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: The aim of this in-vitro study was to identify the influence of intracoronal indirect adhesive techniques(heat processed composite (SR Adoro) andcomputer-aided design / computer-assisted manufacturing (CAD/CAM)ceramic (e Max CAD) inlays)on the fracture resistance of maxillary first premolars and to identify the modes offracture of all experimental groups.Materials and Methods: Forty sound freshly extracted upper first premolar teeth were selected then mounted inacrylic blocks, the teeth were divided into four groupsas follow:Group (A): tenintact teeth (control group).Group (B):ten teeth prepared with standardized MOD inlay cavity but not restored. Group(C): ten teeth prepared withstandardized MOD inlay cavity and restored with indirect heat processed composite (SR Adoro).Group (D): ten teethprepared with standardized MOD inlay cavity and restored with CAD /CAM ceramic material (e max CAD).Fracturestrength of the experimented teeth was measured by using universal testing machine (an axial compressiontest).Data were analyzed statistically by ANOVA and least significant difference tests.Results:Group (D) restored with CAD/CAM ceramic inlays showed more resistance to fracture than teeth restoredwith SR Adoro composite inlays group (C), but the values are statistically not significant, using One way ANOVA test ahighly significant differences (P < 0.01) were found among all groups.Conclusions:All CAD/CAM ceramic inlays and 80% of heat processed compositeinlays survived maximum biting forcefor posterior single tooth, so these two types of inlays provide good reinforcement in an extensive MOD cavities inpremolars,The fracture Mode of SR Adoro composite inlays seems to be 80% restorable while CAD/CAM ceramicinlays 90% of it are restorable type of fracture


Article
The effect of anti-oxidant agents as neutralizers of bleaching agents on dentin bond strength

Authors: Ayad Mahmoud Al-Bayaty اياد محمود البياتي --- Inas I. Al-Rawi ايناس الراوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 2 Pages: 18-23
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Reduction in bond strength when bonding was done immediately after intracoronal bleachingprocedure has been recognized. The purpose of this study is to assess the effect of antioxidants (10% sodiumascorbate (SA), 0.1M thiourea and7% sodium bicarbonate (SB)) on reversing bonding strength of compositeresin to bleached dentin.Materials and method: Sixty upper 1st premolar teeth, were selected, the crowns of the teeth were embedded inacrylic resin blocks exposing a flat dentin from the buccal surface, then divided into 6 groups (10 sampleseach). Bleaching for the experimental groups was performed using 35% hydrogen peroxide bleaching gel(pola–office).Group A (Negative control group; dentin samples immediately bonded with composite withoutbleaching)Group B (Positive control group; dentin samples bleached and immediately bonded with composite).Group C (Dentin samples bleached and stored for 14 days in DDW then bonded with composite). Group D (Dentinsamples bleached and treated with 10% (SA) then immediately bonded with composite). Group E (Dentin samplesbleached and treated with 0.1M thiourea then immediately bonded with composite). Group F (Dentin samplesbleached and treated with 7% SB then immediately bonded with composite).The shear bond strength wasdetermine using instron testing machine.Results: Bleaching the dentin with 35 % hydrogen peroxide gel for 24 minutes resulted in reduction in bondstrength of the bleached teeth when bonding was performed immediately after bleaching. Delayedbonding of composite to the bleached dentin for 14 days will result in a highly significant increase in theshear bond strength.Conclusion: Treating the bleached dentin with 10% (SA) in water base showed a highly significant increase inthe shear bond strength of the composite to dentin and reversing the bond strength value to the level of theunbleached dentin. Treating the bleached dentin with 0.1M thiourea significantly increased the shear bondstrength of the composite to dentin

خلال السنوات الماضیھ لاحظ الباحثون النقص الحاصل في قوة الربط القصي عن اجراء اللصق الاني للحشوة الضوئیھ مباشرة بعد عملیة قصر الاسنان داخل التاج 0 الغرض مناجراء ھذا البحث ھو لتقییم تأثیر موادمضادات التأكسد( 10 % اسكوربات الصودیوم ، 0,1 مول ثایویوریا و 7% بیكاربونات الصودیوم) على قدرتھاعلى اعادة الربط القصي لمادة0 والنتائج % الراتنج المركب الى سابق عھدھاقبل عملیة القصر 0 ولھذا الغرض الغرض تم اختیار ستون سن من الضواحك وتم قصرھا بأستخدام بیروكسید الھیدروجین بتركیز 35اثبتت بعد معالجھ عینات العاج المقصورة بمادة 10 % اسكوربیدات الصودیوم نتج عنھ زیادة عالیة في قوة الربط القصي بین مادة الكمبوزیت والعاج واعادة قیمة قوة الالتصاق الىمستوى الالتصاق مع العاج الغیر مقصور 0 احصائیا لم تكن ھناك زیادة ملموسة في قوة الربط القصي بین مادة الكمبوزیت والعاج المقصور عند معالجة عینات العاج المقصورة بمادة%7 بیكاربونات الصودیوم 0


Article
The influence of recent adhesive onlay fabrication techniques on the fracture resistance of endodontically treated premolars (An in vitro study)

Authors: Zainab Shaker Al-Taii زينب شاكر الطائي --- Inas I. Al-Rawi ايناس الراوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 2 Pages: 12-17
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Endodontically treated teeth have low resistance to fracture against occlusal forces. The strengtheningeffect of bonded esthetic onlay restoration on weakened tooth has been reported. This study aimed to assess thefracture resistance of endodontically treated premolars restored with composite with and without cuspal coverageby using direct and indirect techniques. Indirect technique done by CAD/CAM system (computer aided design –computer aided manufacturer) and laboratory processing.Material and methods: Forty human extracted maxillary premolars of approximately comparable sizes were dividedinto four groups: Group (A): Ten endodontically treated teeth directly filled with Filtek Z250xt without cuspalcoverage. Group (B): Ten endodontically treated teeth prepared with onlay cavities and restored directly with FiltekZ250 XT. Group(C): Ten endodontically treated teeth prepared with onlay cavities and restored indirectly with FiltekZ250 XT. Group (D): Ten endodontically treated teeth prepared with onlay cavities and restored indirectly withParadigm MZ100 CAD/CAM blocks. Fracture strength of the samples was measured by using universal testingmachine (an axial compression test). Data were analyzed statistically by one way ANOVA test and least significantdifference test,Results showed that Group A has the lowest fracture resistance value than all experimental Groups and thedifference are highly significant. While Group B has a high significant fracture resistant value than the indirectlyrestored groups. Group C and Group D showed an approximate fracture resistant result (1.13KN and 1.07KNrespectively) and the difference is statistically not significant.Conclusion All CAD/CAM composite onlay, indirect Filtek z250 XT and direct cuspal coverage survived maximumbiting force for posterior single tooth, so these types of onlays provide good reinforcement in an extensive MODcavities in premolars The mode of fracture for Group D was 90% restorable which is higher than group C (80%)restorable and group B (30%) restorable type of fracture

Listing 1 - 4 of 4
Sort by
Narrow your search

Resource type

article (4)


Language

English (4)


Year
From To Submit

2014 (2)

2013 (1)

2012 (1)