Introduction: Different polymers have been created and used therapeutically as denture foundation materials in dentistry. heat cure acrylic resin, was first released in 1937; this substance, when created via the compression molding method, continues to be the preferred denture foundation material. The volumetric shrinkage of resin is the main factor mentioned for the denture base’s failure to adapt in the palatal and post-palatal seal region of maxillary dentures. Chemical activators, also known as cold-curing, self-curing, and autopolymerizing resins, were first employed in 1947 to induce polymerization at ambient temperature. photoinitiator systems with camphoroquinone as the initiator and visible light as the activator were used to create light-activated denture base resins. Aims and Objective: The objectives of this study was to evaluate the dimensional and volumetric shrinkage in all the four (heat cure acrylic resin, cold cure acrylic resin, light cure acrylic resin and shellac base plate) denture base material. Materials & Method: An in vitro experimental study was carried out, where 4 types of acrylic resin were compared; Group 1 heat cure acrylic resin (Denstply), group 2 Self cure acrylic resin (Dentsply), group 3 light cure acrylic resin (dentsply), group 4 Shellac base plate (Pyrex). A typical flexible rubber mold was used to create a total of 40 prostheses (n = 10 per group) from high strength dental stone (type III stone). Conclusion : Dentures created using heat-cured acrylic resin displayed the maximum amount of polymerization shrinkage within the confines of the current investigation.

Introduction: Different polymers have been created and used therapeutically as denture foundation materials in dentistry. heat cure acrylic resin, was first released in 1937; this substance, when created via the compression molding method, continues to be the preferred denture foundation material. The volumetric shrinkage of resin is the main factor mentioned for the denture base’s failure to adapt in the palatal and post-palatal seal region of maxillary dentures. Chemical activators, also known as cold-curing, self-curing, and autopolymerizing resins, were first employed in 1947 to induce polymerization at ambient temperature. photoinitiator systems with camphoroquinone as the initiator and visible light as the activator were used to create light-activated denture base resins. Aims and Objective: The objectives of this study was to evaluate the dimensional and volumetric shrinkage in all the four (heat cure acrylic resin, cold cure acrylic resin, light cure acrylic resin and shellac base plate) denture base material. Materials & Method: An in vitro experimental study was carried out, where 4 types of acrylic resin were compared; Group 1 heat cure acrylic resin (Denstply), group 2 Self cure acrylic resin (Dentsply), group 3 light cure acrylic resin (dentsply), group 4 Shellac base plate (Pyrex). A typical flexible rubber mold was used to create a total of 40 prostheses (n = 10 per group) from high strength dental stone (type III stone). Conclusion : Dentures created using heat-cured acrylic resin displayed the maximum amount of polymerization shrinkage within the confines of the current investigation.