Dental mold pattern and method of making same

Claim 1

A METHOD OF MAKING A PLURALITY OF PLASTIC DENTAL MOLD PATTERN PIECES THAT ARE PART OF A UNITARY PLASTIC MASS THAT IS REMOVABLY SECURED TO A SHEET BY A PRESSURE-SENSITIVE ADHESIVE OF SUBSTANTIALLY INDENTICAL CONFIGURATION AS THAT OF THE MASS AND WHICH ADHERES TO THE PATTERN PIECES WHEN THE LATTER ARE STRIPPED FROM THE SHEET AND WHEREIN EACH PATTERN PIECE IS SECURED TO THE MASS BY A LINE OF WEAKNESS AT WHICH A PARTICULAR PATTERN PIECE MAY BE SEPARATED FROM THE MASS, SAID METHOD COMPRISING PROVIDING A SHEET WITH A SURFACE UPON WHICH THE PRESSURE SENSITIVE MATERIAL RELEASABLY ADHERES, APPLYING PRESSURE-SENSITIVE ADHESIVE TO SAID SHEET SURFACE SUBSTANTIALLY IN THE CONFIGURATION OF THE PLASTIC MASS TO BE FORMED AND OVER AN AREA THAT IS LESS THAN THE TOTAL AREA OF THE SHEET, PROVIDING A MOLD HAVING CAVITY MEANS OF THE CONFIGURATION OF THE PLASTIC MASS TO BE FORMED, ASSEMBLING THE SHEET AND MOLD SO THAT THE SHEET FORMS A CLOSURE FOR THE CAVITY MEANS WITH THE ADHESIVE ON THE SHEET FACING THE CAVITY MEANS AND IN REGISTRATION THEREWITH, AND INTRODUCING INTO THE MOLD CAVITY MEANS PLASTIC OF THE TYPE THAT WILL ADHERE TO THE ADHESIVE TO MOLD THE PLASTIC IN A MASS THAT IS SUBSTANTIALLY IN THE CONFIGURATION OF THE ADHESIVE.