a simple, sensitive and accurate method for spectrophotometric determination of dalacinphosphatehas been established. the method is based on the reduction of atomic absorptioncalcium ion by phosphate. because, there is a phosphate mole in every dalacin mole structureand with measurement of phosphate, dalacin is beyond measurement too. therefore, the reactionbetween acidic hydrolysis products of...

introduction: the purpose of this in vitro study was to compare working length (wl) changes after straight-line access (sla) and different coronal flaring (cf) methods. materials and methods: coronal access preparations were made (without sla) in molar teeth to allow access to 120 canal orifices with a hand file. the suitable cusp and root tips were then flattened to facilitate reproducible and...

This month in Critical Care we are launching a disaster management themed section, and we hope that the series of articles published in this section will be an important education tool for all of our readers. Recent history has made us much more aware of disasters, be they natural, accidental, or terrorist driven, and our need to prepare for them has never been greater. The first article in thi...

objective: various techniques of composite placement have been used to decrease microleakage around the composite restorations. due to controversial results, the present study was conducted to investigate the effect of different placement techniques on microleakage in class v composite restorations. materials and methods: sixty class v cavities were prepared on the buccal and lingual surfaces o...

the effects of closely adapting a prefabricated fiber to the post space remain unknown. the purpose of this study was to quantify the microleakages of a custom adapted fiber-reinforced post, a prefabricated quartz fiber post and a cast post using nondestructive methods.sixty-five extracted human premolars were endodontically treated and randomly divided into three groups (n=15), which were rest...

background: nowadays colonoscopy has a very important role in screening colorectal cancers. in addition, adequate bowel preparation is critical to colonoscopy, as a poor preparation may obscure pathology or prevent full colonoscopy. as it is estimated that unsuccessful colonoscopy leads to second procedures in up to 20% of patients, we sought to compare the effects of different doses of polyeth...

abstract— in the present study, genetic programming (gp) as a completely different approach in comparison with conventional methods, based on the imitation of natural evolution of living organism is proposed for the prediction of cellulose acetate (ca) polymeric membrane characteristics. the membrane preparation parameters of polymer concentration, additive concentration and coagulation bath te...

introduction: root canal preparation is an important process in endodontic therapy. nickel-titanium (niti) rotary file system can be used in single length technique (simultaneous technique) without early coronal enlargement, as well as in crown-down method. the purpose of this in vitro study was to compare single length with crown-down methods’ shaping ability using mtwo niti files . materials ...

introduction: this study compared apical dye penetration using lateral condensation technique (lc) and lc technique with a reciprocal handpiece (mechanical lateral condensation or mlc) as a new method. materials and methods: forty-eight human extracted straight canine teeth were used. after crown amputation, the teeth were randomly divided into four experimental groups of 10 teeth each and two ...