It is a thermoplastic (T-) or a chemoplastic (C-) polymethylmethacrylate (PMMA).
T-PMMA is produced using industrial polymerisation procedure for producing high purity PMMA with a theoretic level of purity of 99.9%. The residual 0.1% is non cytotoxic and is therefore harmless.
C-PMMA is produced using a chain reaction which may generate free radicals. These radicals allow for formation of long chains polymers. They may trigger allergies and material in-tolerances.
- Metal free
- Strength – > 65 mpa
- E- modulus – > 2800 mpa
- Indicated wearing time – 6 months
These prosthesis have a higher wear and tear and discoloration when compared with the higher performance polymers. Still, they have a distinct advantage of reducing the load on the underlying structures under circumstances of heavy bite force, paan- supari habit, bruxism, clenching etc. They can be used as permanent prosthesis in such cases