objective: the purpose of this study was to evaluate and compare the effect of storage time and conditions on dimensional stability of acrylic patterns. materials and methods: in this in vitro study, a cylindrical shaped metallic post-core was fabricated. impressions were made from this metallic model and 30 samples were prepared with duralay acrylic resin. the specimens were divided into three...

Abstract Sinkhole occurrences due to underground water mains operations have piqued people’s curiosity. Most research works were in relation geophysical practices discover the subsurface cavity. Very few can be found investigation of soil stability cavity shapes. The actual shape an and its transformation is difficult predict, though sinkhole failures are mostly circular on ground surface. This...