الفهرس 
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Abstract
Aimed at determination of some physical properties namely; water sorption, color stability, glass transitional temperature and degree of conversion of newly introduced thermoplastic denture base materials. Moreover, the bond strength of acrylic teeth to these materials was evaluated.
Materials and methods: One commercially available heat cured acrylic resin served as control; two newly introduced thermoplastic denture base materials (Bre. Flex and Bio-Dentaplast) were used. Ninety specimens were prepared for this study, they were subdivided into .30 specimens for each material .five specimens for the following tests: water sorption, color stability, glass transitional temperature, degree of conversion (n=5). Meanwhile, ten specimens will be prepared to evaluate the bond strength between acrylic teeth. Data were collected; tabulated and one-way ANOVA with Tukey’s post-hoc was used to compare the data (P ≤ 0.05). Result; Regarding the water sorption test the conventional heat-cured acrylic resin showed the highest statistically significant corrected water sorption, and there was no statistically significant difference between two newly introduced thermoplastic denture base materials , On the other hand, the two thermoplastic resin denture base showed the highest color stability value than the conventional heat cured acrylic resin denture base. However, the glass transitional temperature values of the Bre.Flex had the lowest Tg among all tested materials. Also, the two thermoplastic resin denture bases showed the highest degree of the conversion than the conventional heat cured acrylic resin denture base. Finally, the conventional heat cured acrylic resin revealed the highest bond strength while the Bio-Dentaplast showed the least bond strength. Conclusion: The study concluded that 1. The thermoplastic resin materials fulfilled the A.D.A requirement regarding the water sorption. 2. For patient allergic to monomer, the newly introduced thermoplastic resin materials are considered as a good alternative to the conventional heat cured acrylic resin. 3. Repair of thermoplastic denture base is a challenge to the dental clinician due to its poor bonding to PMMA.