Vacalon Processing


A Solution to Patient Allergic Reaction to Acrylic

Patient allergic response to methylmethacrylate is considered rare but, when it does occur, it can cause problems. In acute cases, the patient with a new or recently relined denture has a red, sore, inflamed oral mucosa, generally in the area covered by the denture. In less acute cases, the patient may complain of burning or itching sensation or just general discomfort that goes away when they remove the appliance.

Certainly general health considerations should be checked out but a primary cause of these symptoms is allergy to denture base monomer. This can be a problem, particularly if the patient has previously worn an acrylic appliance with no reaction. Like most allergic responses, an acrylic reaction is cumulative. The patient is reacting to the residual monomer or other byproducts (hydro-quinone, ethyl acrylate, or dimethyltoludine) left in the denture base after processing. These materials leach out over time, which is why their old denture does not cause the same reaction. It instead sensitized them to the free monomer.

A solution to this problem is to process using Vacalon. While it is a methylmethacrylate, its unique curing process eliminates the uncured monomer and other byproducts. A Vacalon denture is processed in a special vacuum dry heat furnace (pictured above) at 550 degrees Fahrenheit. The vacuum prevents the base from burning at this high heat. The temperature acts as an external catalyst, forcing the polymerization reaction to completion. It also vaporizes the hydro-quinone inhibiter and the benzoyl peroxide initiator. The result is a more inert denture base with little or no free monomer to irritate your patient. Vacalon is also more resistant to staining and odor because there is less interoral fluid interchange. Request Vacalon on your prescription.

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