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Published on: January 17, 2025
Thermogravimetric Characterization of the Microstructui Composition of Polyamide Injection Molded Denture Base
Ayman Al-Dharrab1, Lana Shinawi2
1Associate Professor, Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, PO Box: 80209, Jeddah-21589, Kingdom of Saudi Arabia, Phone: +96626403316,
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 169°C resulted in about 1.3% of the material loss, and after that the material remains thermally stable up to 200°C. Group 11 showed 2.24% weight loss at 171°C, and further weight loss (12.025%) was observed on heating to 230°C. 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.
