September 30th, 2008 by admin

There are a number of causes of porosity

If the porosity occur on the surface of the denture:

-proper cleansing of the denture will be difficult

-the appearence of the denture will be unsightly
Even tough the porosity may be internal, the denture base will be weakened

Since each internal pore is an area of stress concentration, the denture may warp as the stress relax
Internal porosity may develop in the portion of a denture base as a result of the vaporisation of the monomer or of the
low molecular weight poymers,
when the temperature of the resin increases above the boiling point of these phases
Making mistake at the processing process cause internal porosity

The polimerization reaction is an exotermic reaction
The monomer boil at 100.3º C
The benzole peroxide break into at 65ºC and form free radical
If the flask are placed into the hot water and  the water boil up in a short time, the extra monomer which left in the flask is vaporize so quickly and big spheric porose area occur especially at the thick surface of the denture. This porose area can be spread to the whole surface.
If the flask are placed into the hot water and  the water boil up in a short time, the extra monomer which left in the flask is vaporize so quickly and big spheric porose area occur especially at the thick surface of the denture. This porose area can be spread to the whole surface.