the possibility of using water insoluble fraction from biomass pyrolysis oil as additive in synthesis of wood-plastic novolac has been proved by using differential scanning calorimetry (dsc) and fourier transformed infra red (ft-ir) spectroscopy. synthesis of novolac with different concentrations (10, 20 and 30 wt %) of water insoluble fraction were performed. it was found that mechanical prope...

objective: a clinically feasible convergence angle in full-coverage crown preparations, meeting the requirements for proper retention and resistance forms, has always been a matter of interest for laboratory and clinical researches. this study aims to evaluate the angle in teeth prepared by both under- and post-graduate students at tehran university of medical sciences, faculty of dentistry, de...

background. efficient canal preparation is the key to successful root canal treatment. this study aimed to assess the cleaning and shaping ability, preparation time and file deformation of rotary, reciprocating and manual instrumentation in canal preparation of primary molars. methods. the mesiobuccal canals of 64 extracted primary mandibular second molars were injected with india ink. the samp...

objective: one of the major problems of all ceramic restorations is their probable fracture against the occlusal force. the aim of the present in-vitro study is was to compare the effect of two marginal designs (chamfer & shoulder) on the fracture resistance of zirconia copings, cercon (cad/cam). materials and methods : this in vitro study was done with single blind experimental technique. one ...

introduction: radiolabeled antibiotics are being used for the specific diagnosis of infection by exploiting their specific binding properties to the bacterial components, thereby making it possible to differentiate infection from sterile lesions. the aim of this work was to prepare and evaluate a freeze-dried kit of ciprofloxacin designed for the labeling with 99mtc. methods: factors like amou...