DEVELOPMENT OF THE MATERIALS OF DENTURE BASE

Ali, A. S.; Aly, M. S.; S. F., Esraa; Ali, W. Y.; Ameer, A. K.

doi:10.21608/jest.2025.441461

DEVELOPMENT OF THE MATERIALS OF DENTURE BASE

Document Type : Original Article

Authors

¹ Mechanical Engineering Dept., Faculty of Engineering, Suez Canal University, EGYPT.

² Galaa Teaching Hospital.

³ Endodontic department, Faculty of Dentistry, Sinai university.

⁴ Department of Production Engineering and Mechanical Design, Faculty of Engineering, Minia University, El-Minia.

10.21608/jest.2025.441461

Abstract

The contact and separation as well as friction of materials are accompanied by electrification. When one of the two contacted surfaces is polymeric, the electrification becomes more pronounced. The friction breaks up the rubbing surface and liberates free electrons and ions to generate the electrostatic charge (ESC) on the contacted surfaces. The denture base is made of polymethyl methacrylate (PMMA) that is actively electrostatically charged during attrition with food and teeth. The generation of ESC induces electric field that has drawbacks on the health of human beings. The present work aims to mitigate ESC generated from friction of PMMA by blending with polyethylene (PE) and developing the wear resistance by reinforcing by nanoparticles of silicon carbide (SiC). Experiments have been carried out to measure ESC generated from fiction of the proposed composites. Besides, the scratch test was used to determine friction coefficient and wear at dry condition.

It was found that the highest voltage values were displayed by dry sliding followed by water and salt water wetted surfaces, while olive oil lubricated sliding showed the lowest voltage. As the sliding velocity and load increased, voltage increased. Positive ESC generated from PMMA can be neutralized by blending by 20 wt. % PE. Based on this observation, the magnitude of ESC generated from polymeric materials can be controlled by selecting the proper mixture by the aid of the triboelectric series. In addition, reinforcing PMMA/PE composites by SiC nanoparticles decreased both friction coefficient and wear. It was found that significant decrease in friction coefficient was observed for the PMMA and PE blend. Finally, composites containing 70 wt. % PMMA and 30 wt. % PE showed the lowest wear values. Besides, blended composites reinforced by 1.0 wt. % SiC nanoparticles displayed further lower wear values. It can be concluded that blending PMMA by PE developed the tribological properties and reduce the ESC generated from the sliding on stainless steel (SS).

Keywords