The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)
- Volume 40 Issue 3
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- Pages.236-245
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- 2002
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- 0301-2875(pISSN)
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- 2005-3789(eISSN)
STRAIN CHANGES OF ACRYLIC RESIN SPECIMENS CURED BY THREE CURING CYCLES
- Kang, In-Ho (Department of Prosthodontics, Graduate School, Seoul National University) ;
- Kim, Yung-Soo (Department of Prosthodontics, Graduate School, Seoul National University) ;
- Kim, Chang-Whe (Department of Prosthodontics, Graduate School, Seoul National University)
- Published : 2002.06.01
Abstract
The acrylic resin was first introduced as denture base materials in 1937 and it is commonly used for denture base fabrication nowadays. Three different curing cycles (Conventional curing cycle, short curing cycle and long curing cycle) and three commercially available heat-activated acrylic resins (Vertex RS, Lucitone 199 and ProBase Hot) were investigated to find the curing cycle and material that showed the minimum shrinkage of the resin during polymerization process. A brass master mold was fabricated and duplicated by additional silicone impression material. Stone molds were made by pouring of type III dental stone (SILKY-ROCK YELLOW, Whip-Mix, Louisville, Kentucky). It was embedded in the flask. Strain gauge and thermocouple were embedded in the specimen. Strain gauge and thermocouple were connected to signal conditioning amplifier and data was recorded by pre-programmed software. The parameters ESmax (Maximum expansion strain), Sb (Strain measured just before deflasking procedure), Sa (Strain measured just after deflasking procedure) and Sf (Strain measured at the end of the experiment) were measured.