Effect of carbon nanotubes and graphene on the polymerization shrinkage of heat cure acrylic resin
Objective: To evaluate the effect of incorporating carbon nanotubes and graphene on polymerization shrinkage of heat cure acrylic resin
Methodology: Standard edentulous maxillary casts were made to fabricate different types of denture bases. On the cast, wax templates in the shape of posterior palatal seal (PPS) were made to standardize the quantity of modified material incorporated in the PPS area i.e. acrylic mixed with different concentrations of carbon nanotube or graphene. After denture base fabrication, denture base and cast was trimmed together in the posterior region and the gap between cast and denture base was measured using stereomicroscope.
Result: There was statistically significant difference between control and carbon nanotube group, as well as, control and graphene group (p<0.0001). The gap between the cast and denture base was least with 0.5% carbon nanotube group (0.09mm).
Conclusion: Addition of carbon nanotubes and graphene in denture base acrylic resin showed reduction in polymerization shrinkage. Reduction in the quantity of both carbon nanotube and graphene reduces the effectiveness in counteracting the shrinkage.