Lost wax investment technique with teeth in a wax trial denture
Advancements
- PMMA used since 1930’s polymethylmethacrylate
- Recent advancements is delivery of PMMA through injection molding
- In 2002 LC thermoplastic urethane-dimethacrylate resin
Advantage of urethane-dimethacryalte
- No monomer
- No flasking and packing
- Short processing times
- Less than half volumetric shrinking compared to PMMA
- Will bond to PMMA
Disadvantages
- Sepcial equpiment required
- Mechanical retention required in teeth
- Learning curve