Fluorapatite, fluorinated calcium phosphate, has been identified as a potential matrix for the entombment of the zirconium fluoride fission product waste stream from the proposed FLEX process. If the efficacy of fluorapatitebased waste-storage can be demonstrated, then new and potentially more-efficient options for handling and separating high-level wastes, based on fluoride-salt extraction, wi...

PURPOSE This study compared the microleakage of an experimental low-shrinkage resin composite (Hermes), a nanofilled resin composite material (Filtek Supreme) and a hybrid resin composite (Tetric Ceram) using a dye penetration method. METHODS AND MATERIALS Class I cavities prepared in 60 human molars were randomly divided into 3 groups according to the restorative material used. The preparati...

Power District (NPPD) implemented an inspection program to determine the extent of condition for this type of widely used conductor. Other companies which have had related issues with similar types of corrosion have simply replaced their existing insignificant miles of conductor; however NPPD transmission system includes over 2000 miles of this particular conductor. Throughout 2012, many other ...

INTRODUCTION This study examined the effect of a new bioactive dentin substitute material (Biodentine) on the viability of human gingival fibroblasts. METHODS Biodentine, White ProRoot mineral trioxide aggregate (MTA), and glass ionomer cement were evaluated. Human gingival fibroblasts were incubated for 1, 3, and 7 days both in the extracts from immersion of set materials in culture medium a...

Digital exercises were designed and developed for food chemistry education. During the design process, design requirements were described for such exercises. The exercises were evaluated in three case studies, firstly to determine whether the exercises satisfy the design requirements with respect to students’ use and secondly to provide insight into the effect of the course structure and organi...

The economical use of energy and other limited resources and the protection of the environment will be one of the main influencing cornerstones of tomorrow's mobility. Intensive efforts in the automotive industry focus on further reduction of CO2 emissions and higher energy efficiency in all phases of vehicle life cycles. Consequent development of lightweight design plays a major role for furth...

OBJECTIVES This paper collates some of the existing data on the clinical evaluations of resin-modified glass-ionomer cements (RMGICs) since their introduction two decades ago. METHODS The relevant literature was considered and data reviewed under the headings of retention, marginal characteristics, material deterioration, secondary caries, color stability, as well as pulpal and biological eff...

PURPOSE The purpose of the study was to evaluate the postoperative sensitivity of posterior Class I composite restoration at short-term, restorated with two different all-in-one self-etch adhesives with or without surface sealant application. MATERIALS AND METHODS 44 restorations were inserted in 11 patients who required Class I restorations in their molars. Each patient received 4 restoratio...

OBJECTIVES The aim of this study was to histologically compare the regenerative properties of two allografts manufactured by two Iranian companies. MATERIALS AND METHODS In this study, four 8-mm defects were produced in the calvaria of 12 rabbits. In three defects, three types of allografts namely ITB, CenoBone and Grafton were placed and one defect served as control. Samples were prepared an...

Human biomonitoring is an important tool for the evaluation of environmental exposure to contaminants. The data that are obtained from these studies might be compared to appropriate reference values (RVs) in a specific population. The RVs were derived from the rounded values of the upper limit of the 95th confidence interval of the 95th percentile for lead (Pb), cadmium (Cd) and mercury (Hg) in...