Thermogravimetric Characterization of the Microstructui Composition of Polyamide Injection Molded Denture Base Material vs Conventional Compression Molded Heat cured Denture Base Material.
BACKGROUND Thermoplastic resin polymers are widely used in medicine due to their biostability and hypoallergenic properties, making them a possible alternative to poly methylmethacrylate (PMMA) The current research examined the microstructure of a rapid injection molding system thermoplastic resin for construction of flexible denture compared with that of heat cured PMMA. MATERIALS AND METHODS A total of 40 disk shaped specimens (25 mm in diameter and 3 mm in thickness) were prepared and divided into two groups of 20 disks each (group I samples were of thermoplastic acrylic resin while group II was heat cured PMMA resin) RESULTS In group I, thermogravimetric analyzer showed that increasing the temperature up to 169degC resulted in about 1.3% of the material loss, and after that the material remains thermally stable up to 200degC. Group 11 showed 2.24% weight loss at 171degC, and further weight loss (12.025% was observed on heating to 230degC. Fourier transform infrared (FTIR) spectrophotometer analysis in the range of 400 4000 cm( 1) detected the presence of an amine group (N H) in group I samples and the presence of methylene group attached to inorganic Si as reinforcement filler (Si CH3) CONCLUSION Thermoplastic resin displayed excellent thermal stability and the absence of residual monomer within the polymerized material, suggesting its suitability for the fabrication dentures.
The journal of contemporary dental practice