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Register a new userIn Vitro Comparative Study on the Load Deflection Rate of Fiber Reinforced Composite and Nickel Titanium Archwires
دراسة مخبرية مقارنة بين معدل الحمولة انحراف الخاص بأسلاك الكمبوزيت المقوى بالألياف و أسلاك النيكل تيتانيوم
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Added by
Damascus University ورقة بحثية
Publication date
2012
fields
Dentistry
and research's language is
العربية
Created by
Shamra Editor
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تعد أقواس الكمبوزيت المقوى بالألياف التجميلية أحدث الإضافات في عالم التقويم، و يعد معدل الحمولة الانحراف أهم الخواص الميكانيكية سريرياً التي تتأثر بقطر السلك و بنوع مادة السلك؛ لذا هدفت هذه الدراسة إلى تحري حجم تأثير كل من نوع مادة السلك و قطر السلك في معدل الحمولة انحراف لأسلاك الكمبوزيت ذات الأقطار الآتية: 0.014 و 0.016 إنشاً و مقارنتها بنظيراتها من أسلاك النيكل تيتانيوم المناسبة لمرحلة الرصف.
Esthetic orthodontic archwires (fiber reinforced composite archwires) are considered as the latest addition to orthodontic's world, and the load deflection rate is thought to be the most important mechanical property of archwires which has strong effect clinically, and this property is affected by the cross section diameter and the material's type, for these reasons this study aims to investigate the effect of the material's type and the cross section diameter of orthodontic archwires on the load deflection rate of fiber reinforced composite(FRC) archwires with a diameter of 0.014 inch and 0.016 inch which are suitable for the leveling and alignment stage, and to compare these new materials with Nickel titanium(NiTi) archwires .
References used
Burstone, CJ . Application of Bioengineering to Clinical Orthodontics. In:Graber, TM and vanarsdall, RL . Orthodontics-current principles and techniques, 3rd ed, St.Louis: Mosby ; 2000, pp269-285
Chalasani, S, Mandava, P and Singaraju, G . The Clinical Relevance of orthodontic archwire properties: a review. Annals and Essences of Dentistry,2011; 3:113-117
Kusy RP. A review of contemporary archwires: Their properties and characteristics. Angle Orthod, 1997; 67:197-202
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Aim: to compare the shaping ability of NiTi hand instruments with Stainless- steel instruments in preparation of curved root canal in extracted teeth.
Materials and Methods: a total of 24 of curved root canal were randomly divided into two groups. O
ne group was prepared using stainless steel instruments and the other prepared NiTi instruments. Curvatures pre-and post instrumentation were registered and compared. And straightening of the canals were determined by autocad analysis system.
Results: two systems were significantly changed the original canal curvature with no differences between both systems. However, the time required to finish preparation was significantly less with NiTi system.
Conclusion: under the conditions of this study, it can be concluded that two hand instrumentation system changed the original canal curvature, but the time consuming to finish the preparation was less with NiTi hand system.
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.
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.
One aim of the root canal treatment is providing compact
three dimensional seal for the canal system to prevent germs
enter and its products across both the apical and coronal
ways.
Gutta-Percha is the most use material to fill the radicalism
ca
nals. It has limited importance in spite of many
specifications as lack of the link to the ridge canal.
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.
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