PLASTIC SHEETS FOR THERMOFORMING DENTAL PRODUCTS

摘要

A sheet ( 10, 20 ) for use in a model vacuum thermoforming process, wherein the sheet ( 10, 20 ) has a thickened area ( 11 ) that may be in a preselected three-dimensional form such as arch-shape ( 12 ). The thickened area ( 11 ) or three-dimensional area ( 12 ) is placed over an area of the model ( 21 ) where the plastic sheet is to be stretched during the thermoforming process. This ensures a uniform or a preselected thickness in the stretched areas than would otherwise occur.