# Salivary pH influence on mechanical and surface properties of high-impact acrylic denture resin

## TL;DR

This study shows that adding polypropylene fibers improves the strength of denture material more than polyethylene or no fibers.

## Contribution

The novel finding is that polypropylene fibers significantly enhance the flexural strength of PMMA denture resin.

## Key findings

- Polypropylene fibers increased flexural strength to 169.61 MPa, outperforming polyethylene and control groups.
- The improvement in mechanical performance suggests better durability for PMMA dentures with polypropylene reinforcement.

## Abstract

Polymethyl methacrylate (PMMA) has been widely used as a denture foundation material even though it does not have enough flexural
strength. Hence, the flexural strength of heat-cured PMMA has been tested by incorporating polyethylene and polypropylene fibers in an
in vitro experiment. The experiment on 120 controlled specimens was carried out via a three-point bending test. Results
showed significant improvement with both fibers, with polypropylene (169.61 ± 16.30 MPa) providing superior reinforcement compared to
polyethylene (129.29 ± 5.00 MPa) and control (99.91 ± 3.79 MPa) (p < 0.001). Thus, we show polypropylene fiber
reinforcement as an effective approach to enhance the mechanical performance and longevity of PMMA dentures.