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Register a new userIn vitro comparative Study of mechanical resist Prof.ance for ceramo-metal crowns with metal collar and porcelain margins
مقارنة مقاومة انكسار التيجان الخزفية المعدنية ذات السوار المعدني و الحافات الخزفية مخبرياً
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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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استخدمت الحافات الخزفية للتيجان الخزفية المعدنية للتغلب على مشكلة التلون الرمادي للحافات اللثوية المسببة بالسوار المعدني في الترميمات الخزفية المعدنية التقليدية، و لكنها أوجدت بعض المخاوف عن تأثيرها في إنقاص المقاومة الميكانيكية لهذه الترميمات. هدف هذا البحث إلى مقارنة مقاومة انكسار التيجان المعدنية الخزفية ذات الحافات الخزفية العنقية الكاملة بارتفاع 1 ملم أو 2 ملم، و مقارنتها بمقاومة انكسار التيجان المعدنية الخزفية ذات السوار المعدني العنقي .
The idea of use ceramic margins for metal-ceramic crowns was founded to overcome problem of grayness for gingival margins that caused by metal collar in metal-ceramic crowns , but at the same time there are a lot of cautions on decrease mechanical resistance for these restorations. This study aims to study fracture resistance of metal-ceramic crowns with ceramic margins in 1 or 2 mm. long, and compare it with mechanical resistance of metal-ceramic crowns with metal collar.
References used
Wook Yoon J, Hun Kim s, -Bong Lee J, Suk Han J, Ho Yang J. A study on the fracture strength of collarless metal-ceramic fixed partial dentures , J Adv Prosthodont 2010; 2(4): 134–141
Ulusony M, Toksavul S . Fracture resistance of five different metal framework design for metal-ceramic restoration . Int J Prosthodont 2002;15(6) : 571-574
ANUSAVICE KJ , HOJJATIE B . Stress Distribution in Metal-Ceramic Crowns with a Facial Porcelain Margin. J Dent Res1987; 66(9):1493-1498
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Vibration of Ultrasonic has used for scaling
and periodontal curettage, it is also has used for metal crown and
metal-ceramic crown removal, subsequently, using the tips whether for
scaling or removing crown, they will be in direct contact with th
is crown,
This research aimed to evaluate the surface of metal-ceramic crown
after exposure to Vibration of Ultrasonic tips.
It was recently noted that there are
serious trials to develop dental materials used in the prosthodontics.
As a result of this development, some veneering ceramic systems
used in metal-ceramic crowns have been appeared. In view of the
major impo
rtance of marginal fit and its role in the success of
restoration it must be a study and evaluation of marginal fit for these
modern systems.
This research aimed to comparasion of marginal fit for metal ceramic
crowns using two types of veneering ceramic.
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 aim of this study To compare in vitro shear bond strength (SBS) of different
orthodontic adhesives in and rebonding metal brackets after preparing their bases
mechanically.
Material and methods:Sample consisted of 40 extracted first premolars,
randomly
divided into two groups (n=20),.Adhesive removed by tungsten carbide bur later the
brackets were rebonded. The tests were performed in a tecnotest (6kN) SBS testing
machine, at a speed of 1 mm/min.
It was found that the mean shear bond strength of Reseliencewas 19.25 MPa and that
of Heliosit orthodontic was 10.25MPa.We foundthat the mean shear bond strength of
rebonding forReselience was 13.70 and 7.95 forHeliosit.The t-test revealed that there was a
significant difference between the shear bond strength of the two groups.
We found a significant difference between bonding and rebondingfor
Reselience,while there was no significant difference between bonding and rebonding for
Heliosit.
With the increase in the number of adult patients seeking orthodontic treatment, the need to ensure sufficient bonding strength for the fixed orthodontic components on the ceramic restorations has become an urgent matter. Adhesion of the orthodontic
bracket is an essential and indispensable step.
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