# Fracture resistance of teeth restored with polyethylene fibers reinforced composite restorations: a systematic review and meta-analysis of in vitro studies

## TL;DR

This study finds that using polyethylene fibers in dental restorations increases the strength of teeth and reduces the risk of fractures in lab tests.

## Contribution

The study provides a systematic review and meta-analysis on the fracture resistance of polyethylene fiber-reinforced dental restorations.

## Key findings

- Polyethylene fiber-reinforced restorations showed significantly higher fracture resistance than non-reinforced ones.
- The use of polyethylene fibers significantly reduced the number of unfavorable fractures.
- Results are based on in vitro studies and need clinical validation.

## Abstract

This systematic review and meta-analysis aimed to evaluate the fracture resistance of permanent teeth restored with polyethylene fiber-reinforced composite resin restoration.

The following PICOS framework used was: Population, permanent teeth requiring restorative treatment; Intervention, polyethylene fiber use; Control, composite resin restorations without fiber reinforcement, or conventional fiber posts; Outcome, fracture resistance (in Newtons); Study design, in vitro studies. A literature search was conducted independently by two reviewers up to May 18, 2025, using electronic databases (PubMed, ISI Web of Science, SciELO, Scopus, and Embase). In vitro studies examining the fracture resistance of permanent teeth restored with polyethylene fiber-reinforced resin composite restorations were included. Meta analyses were performed by comparing the standardized mean differences in the fracture resistance of teeth restored using polyethylene fibers and the teeth restored only with resin composite. Additional analysis was performed comparing the risk difference of the number of unfavorable fractures. Separate analyses were performed when fiber posts were used. A p-value of less than 0.05 was considered statistically significant.

The fracture resistance of polyethylene fiber-reinforced restorations was higher compared to non-fiber reinforced composite restorations (p < 0.001). Also, the number of unfavorable fractures were significant lower when polyethylene fibers were used (p < 0.001).

The findings suggest that the fracture resistance of permanent teeth may be improved with the use of polyethylene fibers. However, clinical performance outcomes are necessary to validate these in vitro results.

The protocol for the systematic review was developed a priori and can be accessed at: https://doi.org/10.17605/OSF.IO/5K8XB.