title: Radiographic evaluation of porosities in removable partial denture castings.
abstract: Most of the removable partial denture castings examined showed radiographic evidence of internal porosity. In general the porosity ocurred in characteristic regions associated with abrupt changes in cross-sectional thickness. These were located either within the partial denture framework or at the casting-sprue junctions. The porosity is due to metal shrinkage caused by a premature solidification at some point, which in turn interferes with a controlled unidirectional soldification of the casting.
mesh_terms: D003722:Dental Alloys; D003832:Denture, Partial, Removable; D008669:Metallurgy; D011859:Radiography; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D003722:Dental Alloys