College of Dentistry

On Thursday, October 16, 2025, the Department of Prosthodontics at the College of Dentistry, University of Mosul, hosted the defense of the doctoral dissertation entitled:” Three-Dimensional Finite Element Analysis of Denture Base Resin Modified by some Polymers”, Forwarded by Ibtihal Hazem Hassan. The study investigated focused on evaluating several properties of Poly Methyl Methacrylate (PMMA) by incorporating it with three types of chemically compatible polymers. The study involved preparing 545 samples of heat-polymerized acrylic resin, divided into two groups:
Control Group: without additives
Experimental Group: with additives
The additives included three types of polymers:
Polyamide polymer
Polyester polymer (both prepared specifically for this study)
Fumed silica incorporated at volumetric concentrations of 1%, 3%, and 5%, separately. The findings indicated that all tested materials were biocompatible. The incorporation of polymers resulted in an acceptable color change and enhancement of several physical and mechanical properties. A decrease in flexural strength and stiffness was observed for polyamide and polyester, while a notable increase was recorded with the addition of fumed silica. Additionally, water absorption and solubility of PMMA decreased across all concentrations (1%, 3%, and 5%). Surface roughness decreased for both polyamide and polyester, whereas fumed silica showed a reduction at 1% and an increase at 3%. It was concluded by the research aimed to analysis (FEA) demonstrated a strong correlation between experimental results and the elastic modulus of each material, indicating improved stress distribution and reduced stress concentration on the denture base structure. This effect was most evident in the following order: fumed silica, polyamide, then polyester.

The examination committee was chaired by Prof. Dr. Ahmed Asim Saeed/ College of Dentistry/ University of Mosul, with membership of Prof. Dr. Nadia Tawfiq Jafar/ College of Dentistry/ University of Duhok, Assist. Prof. Dr. Maher Abdulrazaq Mohammed/ College of Education for Women/ University of Mosul, Assist. Prof. Dr. Neam Riyadh Saleem/ College of Dentistry/ University of Mosul, Assist. Prof. Dr. Alia Wameed Ramzy/ College of Dentistry/ University of Mosul, and under the supervision and membership of Prof. Dr. Nada Zuher Mohammed/ College of Dentistry/ University of Mosul, and Prof. Dr. Asaad Faisal Khattab/ College of Science /University of Mosul.

The thesis was accepted after making the recommended corrections.

Achieved targets of the Sustainable Development Goals: Goal 4