objective: etching of enamel and dentin is an important step in restoration of teeth with composite resin ensuring the retention of restoration and decreasing microleakage. this in vitro study sought to compare the effects of kimiya and etch-rite acid etchants on the microleakage of composite restorations.   methods: this experimental study was conducted on 30 sound human molar teeth. class v c...

Ultrasound micro-molding technology has proved useful in processing biodegradable polymers with minimum material loss. This makes this technology particularly suitable for the production of biomedical microdevices. The use of silica (SiO2) nanoparticles is also interesting because of advantages like low cost and enhancement of final properties. Evaluation of the capacity to create a homogeneous...

The structure of an oil/water emulsion is known to depend on its preparation method. Here, we test whether the preparation protocol can be used to control the morphology of ‘‘model’’ blends of immiscible polymers compatibilized by a diblock copolymer. Two preparation protocols were tested. In the ‘‘double blending’’ protocol, a droplet-matrix blend was blended with additional drop-phase fluid. ...

The use of waste materials to make eco-friendly wood-polymer composites has been explored by many researchers for academic and industrial purposes due the low cost, biodegradability, availability wood flour. Polypropylene (PP)/ground tyre rubber (GTR)/wood flour (WF) were prepared using an internal batch mixer at a temperature 165 °C 8 min, samples injection-moulded 190 with pressure 6 MPa. des...