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Register a new userComparative study for mechanical properties (wear resistance) of direct posterior restorative composite (hybrid and nanoceramic composite)
دراسة مقارنة لخاصية مقاومة الاهتراء للراتنج المركب الترميمي المباشر الخلفي الهجين و الراتنج المركب ذي الحبيبات الخزفية
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دارين توفيق جمول( باحث )
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المقدمة : إن المطلب الجمالي لترميمات الأسنان الخلفية تزايد بشكل الملحوظ في السنوات الأخيرة, لقد طورت العديد من المواد الترميمية السنية لتلبية النواحي الجمالية, الالصاق و الخواص الميكانيكية . الهدفَ من هذه الدراسة: تحرّي تأثيرِ إضافةِ المالئاتِ الخزفيّةِ في بعضِ الخصائِص الميكانيكيةِ (مقاومة الاهتراء) لترميماتِ الراتنجِ المركّب المقوّى بالجزيئاتِ المالئةِ الخزفية, و ذلك بهدفِ مقارنتِها مع ترميماتِ الراتنج المركّب الهجين الخلفي . مواد و طرائق البحث: تمّ استخدامُ مجموعتين من الراتنج المركّب الهجين الخلفي و هما : -Spectrom - Tetric Ceram و مجموعتين من الراتنج المركّب المقوّى بالجزيئات الخزفية و هما Tetric Evo Ceram - - Ceram-x تألّفت الدراسةُ المخبرية من ستين عيّنةً لدراسةِ اختبارِ مقاومة الاهتراء حيث تم تحضير العينات على شكل اسطوانات بأبعاد (قطر 3ملم ارتفاع 3ملم) . النتائج: أظهر الراتنج المركب Tetric Evo Ceram مقدار اهتراء اقل من باقي الراتنجات الخاضعة للدراسة. الاستنتاجات:لم تظهر فروق دالة احصائياً بين نسب مقاومة الاهتراء لكل من الراتنج المركب الهجين و الراتنج المركب المقوى بالجزيئات الخزفية .
Introduction :The demand for posterior aesthetic restorations has dramatically increased in recent years. Several new materials have been developed with improved aesthetic, adhesive and mechanical properties. Theoretically, nano-structured dental resin omposites are purported to have increased wear and hardness resistance compared with hybrid composites and may favor the achievement of restoratives with better long-term performance. Aim: The wear resistance of different types of resin composites were evaluated in the in vitro study. Material and methods :Two nanohybrid restorative composites -Tetric®EvoCeram (Ivoclar-Vivadent) and CeramXTM(Dentsply) - were compared with a microhybrid material - Tetric®Ceram (Ivoclar-Vivadent) and hybrid material Spectrom (Dentsply) . wear resistance : fifteen specimens (3x3 mm) of each material were subjected to wear tests . The data were analyzed by 1-way ANOVA(<=0.5). Results : The Tetric®EvoCeram composite resin exhibited significantly less wear than the CeramX and Tetric®Ceram material . Conclusions :In terms of wear resistance, nano-structured composites may perform either similarly or comparatively better than a microfilled and hyprid composite . nanohybrid restorative composites can thus be considered as a good restorative material.
References used
Zeynep Duymus Yesil, DDS, PhD,a Satish Alapati, BDS, PhD,b William Johnston, PhD,c and Robert R. Seghi, DDS, MSd. Evaluation of the wear resistance of new nanocomposite resin restorative materials. J Prosthet Dent 2014;99:435-443
Anderson din,non-metalic denture base materials applied dental materials .5th ed London:Blackwell scientific 1976:248
Bowen RL.Use of epoxy resins in restorative materials.(1956).J Dent Res:360-9
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Regarding the sealing ability of restorative dental materials, this
study was done to assess the microleakage of class V cavities
restored with a new self-adhesive flowable composite resin and
compare to different flowable materials.
The purpose of this study is to detect the relationship between dentin
bonding systems (total etch and self etch) and the marginal leakage of
composite resin restorations.
The aim : This study aims to evaluate and compare the microleakage between nano
and hybrid composite.
Materials and Methods : the sample consisted of forty extracted premolars for
orthodontics purposes , class v cavities were prepared with a speci
fic dimensions on the
buccal surface. The sample divided into two groups ; group A restored by nanocomposite (
Z350) , group B restored by hybrid composite ( Z250) , after that, the samples were placed
in the incubator with thermo cycling for a month ,The samples were then immersed in 0.5
% methelyne blue dye for 24 hours , each tooth was mesial-distal sectioned vertically ,
finally, of all samples was studied using stereomicroscope to evaluated the microleakage .
Results : there was no statistical significant difference between the nano and hybrid
composite according to microleakage.
Resin based composite considers substantially as a restorative
material in clinic. Dentists concern in placement resin composite
restorations with Long term survival.
Materials and Methods: 20 Non carious human third molars, class I
cavity was pr
epared in every molar, restored with methacrylate
resin composite Tetric EvoCeram. The restored teeth were
subjected to thermocycles. Specimen was randomly divided into
two groups : the first group 10 restorations, were repaired by
Cojet® (3M ESPE, Germany) and restored by Filtek™ P90, the
second group 10 restorations also repaired by Cojet ® but restored
by Filtek™ Z350 XT. After that all teeth were subjected to
thermocycles again, later immersed in 0.5% basic fuchsin solution
for 1 s. The teeth were transversely sectioned and observed under
a stereomicroscope. The degree of dye penetration was recorded
and analyzed.
Results: No statistically significant differences in microleakage
were observed between two groups either with low shrinkage
Silorane resin composite or methacrylate resin composite
In this work composite hybrid materials were prepared from a base
material composed of epoxy and phenol - form aldehyde resins and
reinforced by 30% wt alumina and silica powders and asbestos
fibers. For samples were prepared with. Different ratio of
reinforcing material.
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