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 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.
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.
The research project sample consisted of 30 blocks of composite resin , these blocks where divided into three equal groups , 10 of composite resin Z-250 from 3M ESPE Company , 10 of the composite resin Supreme from 3M ESPE Company ,10 of the composit
e resin Quixfil of Dentsply company, and has been testing the hardness Number, each sample individually. The aim of the previous procedures was to show the role of composite resin structure in determining the hardness number Through differences in the hardness number and the role of this hardness determining the mechanical properties for composite resin restorations cause of the importance of this property to understand the mechanical properties for a lot of restorative materials. And the result is that there is a statistically significant between the resin Quixfil and the Z-250 on the one hand and the Supreme resin on the other hand.
The research project sample consisted of 80 extracted central incisors obtained from the Oral and Maxillofacial Surgery Department as well as from private practices. These teeth were divided into two equal groups. The bonding agent ClearFil SE Bond w
as used in one group, whereas the OptiBond Solo Plus bonding agent was used in the other group. Each group was divided into four subgroups: (1) veneers performed without any bleaching, (2) veneers performed two weeks before bleaching, (3) veneers performed immediately following bleaching and (4) veneers performed two weeks after bleaching.
veneers were made using a special template which allowed producing the same size of all the specimens used in this project. These veneers were placed on the vestibular surfaces of enamel of the extracted central incisors.
The aim of the previous procedures was to study the effect of home teeth bleaching .
Teeth were embedded in acrylic blocks created in metallic cylinders. The bonding strength was measured through .
The results showed that there was a significant difference between the control subgroup and the second subgroup .
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.
