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Register a new userUsing modeling to study the effect of tooth shape on the stress field under the tooth
استخدام النمذجة في دراسة تأثير شكل سن رأس الحفر على الحقل الإجهادي تحت السن
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نضال ابراهيم( باحث )
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درسنا في هذه المقالة نوعين من الاسنان و هي الكروية و المخروطية و قارنا النتائج رقميا مع دراسة سابقة عن السن المسطح. من خلال دراسة الحقل الإجهادي تحت هذه الاسنان الثلاثة تبين لنا أنه و في الصخور الطرية يستحسن استخدام السن المخروطي الطويل نتيجة سهولة انغراسه في الصخر و هذا ما اكدته قيم الاجهادات اسفل السن. اما في الصخور القاسية و نظرا لحاجتنا لقيم ضغط كبيرة لتحطيم الصخر يفضل استخدام السن الكروي لما له من خاصية تشكيل مخروطين إجهاديين تحت السن و بالتالي يمكن من تفتيت حجم جيد من الصخور القاسية.
In this article we studied two types of teeth, spherical and conical one. We compared the results with a previous study for the flat tooth. the study of stresses field under these three teeth show that in the soft rocks we prefer to use conical tooth because it is easy to be Implanted in the rock, and this was confirmed by the values of stresses under the tooth. Either in hard rock and due to our need for big values of pressure to shatter the rock we prefer to use spherical tooth because of its property of forming tow cons of stresses under tooth and therefore can be good in drilling hard rock..
References used
د. هيسم عازار. 1996 - ميكانيك تفتيت الصخور.منشورات جامعة البعث-كلية الهندسة الكيميائية و البترولية, الطبعة الأولى, 204 صفحة.
Schechter.R, 1992- Oil well simulation , University of Texas,312p
Springman S-2009- Modelling in geotechnics. Institute of Geotechnical Engineering, 175p
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This study aims to shorten the orthodontic treatment period
into,at least, half the length of time. It takes in order to reduce the
complaints of patients of the length of orthodontic treatment through
the induction of the secretion of prostagland
in E2 topically by
raising the inflammatory process via injection of vitally accepted
materials which are used routinely in daily dental practice,
Lidocaine 2% which leads to the increase of proportion of
osteoclasts and the occurrence of bone absorption in the injected
area ( the area of the tooth to be moved) .
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 .
with advancing stages of oil production, the produced water ratio is
gradually increased, which provides favorable conditions for the
formation of oil emulsions.
This research aims to increase the production lifetime of oil and gas
wells through avoiding the problems that production casing string
may be exposed to. Such problems are caused by the effect of different
drilling fluids as well as other fluids normally existed in the annular
behind casing at the none-cemented intervals.
This study aims to investigate the effect of the alveolar ridge shape in
the distribution of stress at the lower removable partial dentures
supported by implants using a finite element method, with four models
for a half mandible are designed with
a free end saddle using an
ANSYS program and Canine was abutment, where the remaining ridge
is representing the four alveolar ridge shapes (horizontal and distal
descending and concave and distal ascending), two removable partial
dentures were designed for each model one supported by tooth and
fibromucosa and another one supported by tooth and implant, it has been
applied a load of 50 Newton on all models and has been studied stress
equivalent for each model.
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