نتایج جستجو برای: in vitro caries model
تعداد نتایج: 17315480 فیلتر نتایج به سال:
To investigate the effect of fluoride and silver nanoparticles on prevention in vitro demineralization sound enamel caries-like lesions varying severities. Caries-like different severities (1/6/15 days) were created bovine specimens. One group remained sound. All specimens demineralized again using a partially saturated acetic acid solution. Mimicking intra-oral retention vitro, this solution w...
the aim of this paper is eliminating cr(vi) by natural hap. hap is a inexpensive material which is used from bovine critical bone ash in order to remove heavy metal ions like cr(vi). some experiments in different ph are performed (ph=2,3,7). maximum adsorption was appeared at ph=2, dosage=0.3 gr, c0=10 mg/l. cr(vi) removal depends on ph value and initial amount of cr(vi) result of experiments w...
in vitro comparison of conventional film and direct digital radiography in proximal caries detection
introduction: various systems for intraoral digital radiography have been available as an alternative to film–based radiography. in consideration of several advantages of digital radiography such as less patient absorbed dose, manipulation of im age quality and elimination of processing, it has been extensively used in different fields of denti stry in recent years. the purpose of this study wa...
drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...
this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...
Photodynamic therapy has been considered a potential antimicrobial modality against oral infections, including dental caries. A model to estimate the penetration of both photosensitizers and light through human dentin, a factor of interest in photodynamic therapy, is proposed. The photoacoustic spectroscopy technique was used to evaluate in vitro dentin permeability of three different photosens...
objective: when none of digital systems and scanners is accessible and it is essential to have digitized images of conventional radiographs, digital cameras can be used. the aim of this study was to investigate whether digital images obtained by different resolutions of a digital camera are matched to the original radiographs in evaluation of caries. methods: in this diagnostic accuracy in vitr...
OBJECTIVES The present study evaluated the microtensile bond strength and caries formation on adhesive/dentin interfaces before and after dynamic chemical formation of secondary caries. METHODS Restorations were prepared on the dentin surface of 80 bovine incisors using four adhesive systems: two fluoride-free (Single Bond and Clearfil SE Bond) and two fluoride containing (Optibond Solo Plus ...
PURPOSE The objective of this project was to develop an in vitro model system for investigations of dentinal caries. METHODS Five extracted primary molar teeth with circular cavity preparations to the depth of the dentinoenamel junction were mounted individually in cold-cure acrylic bases constructed to fit a positioning jig in a Schick-Technologies digital radiographic imaging apparatus. The...
فیتوپلاسماها گروهی از پروکاریوتهای غیر مارپیچی و بدون دیوارهی سلولیاند که در آوندهای آبکش گیاهان و همولنف حشرات وجود دارند. این موجودات تا به حال در شرایط in vitro کشت نشدهاند اما بر اساس توالیهای حفاظت شدهی آنها مشخص شده است که متعلق به رده مالیکوتها هستند و در جنس phytoplasma candidatus قرار گرفتند. برای بررسیهای عملی و مدیریت بیماریهای فیتوپلاسمایی لازم است فیتوپلاسماها در میزبانهای...
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