In English title page publication date 2009 and In Arabic title page publication date 2019

Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine- Department of Prosthodontics

Statement of the problem Despite the acrylic resin advantages and its wide usage in denture fabrication these days, Undesirable biological effects caused by denture base resins due to residual monomers have been widely documented in the literature (9,10,11,12), also studies proved that it is poorly resisting uneven masticatory forces or being dropped due to relatively low impact strength (13), leads the way for other means to enhance poly methyl methacrylate by reinforcements or shifting to other materials such as nylon like materials. Research question Do patients with a complete denture made of injectable thermoplastic resin have the same maximum biting force like the conventional complete denture made by pressure molding poly methyl methacrylate material? Type of the study Randomized control trial. The aim of the study The present study was conducted to compare between the polyamide thermoplastic resin and polymethyl methacrylate resin with respect to maximum biting force as the outcome. II. Materials and Methods In this randomized clinical trial, forty completely edentulous patients were randomly classified into two groups of twenty four patients each. Group (I) had received a complete denture made from a polyamide thermoplastic material complete denture. Group (II) had received complete denture made from polymethyl methacrylate. Maximum biting force was evaluated using a i load sensor. Results The results of this study had revealed that: Immediately, the mean force was 30.9±4.8N for thermoplastic polyamide and was 32.8±12.7N for conventional PMMA with no statistical significant difference between both groups (p=0.549). After 3 months, the mean force was 32.3±7N for thermoplastic polyamide and was 42.8±25N for conventional PMMA with no statistical significant difference between both groups (p= 0.083

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