a curing apparatus wherein rapid curing is provided by using light , pressure , pressure and light , or purge , pressure and light to cure resinous materials by application of energy from an external source to excite polymerization in a polymerizable system . an air - tight chamber is provided to house the polymerizable dental material . the apparatus provides an automated system for curing the polymerizable material under light and pressure in the same unit . a purge cycle may be included to minimize or eliminate bubbles and provide an oxygen - free atmosphere .