نتایج جستجو برای: fracture strength

تعداد نتایج: 293498  

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی استان فارس - دانشکده دندانپزشکی 1381

چکیده ندارد.

Journal: :iranian endodontic journal 0
sayed shojaedin shayegh department of prostodontics, dental school, shahed university, tehran, iran. [email protected] kiumars nazari moghaddam department of endodontics, dental school, shahed university, tehran, iran maryam khoroshy department of operative dentistry, dental school, isfahan university of medical sciences, isfahan, iran froogh khoroshy department of material engineering, isfahan university of technology, isfahan, iran

introduction: the aim of this study was to determine the effect of different luting agents on fracture resistance of endodontically treated teeth restored with casting post. materials and methods: in this experimental study, forty extracted human maxillary central incisors teeth with the mean length of 23mm were randomly assigned in to four groups. all the studied teeth were caries free without...

ABU FANAS S.H., , HADIAN A.M., ,

Enhancing the properties of dental resin composites is of interest to researchers. The objective of the present investigation was to improve the strength and fracture toughness of dental composites via addition of silicon carbide whiskers and substitution of commonly used filler materials with stabilized zirconia ceramic powder. It was also intended to study the effect of powder- to- whisker ra...

Journal: :Journal of oral rehabilitation 2000
M Rosentritt C Fürer M Behr R Lang G Handel

In root-treated anterior teeth a better aesthetic can be achieved by using translucent and tooth-coloured post and core restorations instead of traditional metal post systems. The aim of this in vitro study was to compare the fracture strength of tooth-coloured ceramic and fibre-reinforced posts as well as titanium posts with clinically proven gold alloy posts as a control. Two all-ceramic, one...

Journal: :journal of mining and environment 0
h. r. nejati rock mechanics department, school of engineering, tarbiat modares university, tehran, iran seyed a. moosavi rock mechanics department, school of engineering, tarbiat modares university, tehran, iran

assessment of the correlation between rock brittleness and rock fracture toughness has been the subject of extensive research works in the recent years. unfortunately, the brittleness measurement methods have not yet been standardized, and rock fracture toughness cannot be estimated satisfactorily by the proposed indices. in the present study, statistical analyses are performed on some data col...

Journal: :iranian endodontic journal 0
sedigheh saatian department of prosthodontics, dental school, hamedan university of medical sciences, hamedan, iran. [email protected]

introduction: prefabricated metal and ceramic posts can be used with different kinds of core materials as an alternative to the conventional casting post and cores. it is unclear how these post and core systems can withstand different kind of forces in the mouth. the purpose of this study was to compare the fracture strength of endodontically treated, crowned maxillary incisors restored with ca...

Rezaei Ashtiani, H. , Shafiee, M. ,

Friction stir spot welding (FSSW) is a type of solid state welding that is used in the connection of small pieces and light metals such as aluminum alloy especially. The technical problem during melting of aluminum alloys is one of the most important reasons for developing application of friction stir welding for aluminum alloys. In this research, the effects of important processing parameters ...

Assessment of the correlation between rock brittleness and rock fracture toughness has been the subject of extensive research works in the recent years. Unfortunately, the brittleness measurement methods have not yet been standardized, and rock fracture toughness cannot be estimated satisfactorily by the proposed indices. In the present study, statistical analyses are performed on some data col...

Journal: :Physical Review Letters 2012

Journal: :Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research 2017
Hanh M Pham Sing C Nguyen Thao P Ho-Le Jacqueline R Center John A Eisman Tuan V Nguyen

Osteoporotic fracture increases the risk of premature mortality. Muscle weakness is associated with both increased fracture risk and low bone mineral density (BMD). However, the role of muscle strength in post-fracture mortality is not well understood. This study examines the change of muscle strength measured at quadriceps (QS) before and after fracture and defines the relationship between mus...

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