Prosthodontics Lecture 17-18: Denture Flasking

Processing of the Denture (Flasking)

• Flasking is the process of investing the cast with the waxed denture in a flask to create a two-sectional mold for forming the acrylic resin denture base.
• A flask is a metal case or tube used in investing procedures, consisting of:
  • Lower half containing the cast
  • Upper half
  • The cover or lid

Flasking Techniques

Compression Technique (Open-Pack Method)

• Involves investing the master cast with the waxed-trial denture in the lower half of the flask with gypsum investment material.
• Upper half of the flask is then placed, and gypsum is poured to the occlusal surfaces of the teeth.
• Top portion of the flask is poured with another layer of plaster or stone, and the cover is placed on the flask.

Injection Molding Technique

• A complicated procedure requiring special flask and equipment.
• Involves spruing the wax pattern and injecting material into the mold.
• Allows for injection of further material during polymerization to compensate for polymerization shrinkage.

Learn about the process of flasking in denture production, including the use of flasks and molds to form the acrylic resin denture base.