# Assessment of biomimetic materials in strengthening root canal-treated teeth during orthodontic intrusion or extrusion

## TL;DR

This study shows that biomimetic materials, especially fiber-based ones, strengthen root canal-treated teeth better than traditional composites during orthodontic procedures.

## Contribution

The novel contribution is demonstrating that fiber-based biomimetic materials significantly improve fracture resistance in root canal-treated teeth under orthodontic forces.

## Key findings

- Teeth restored with fiber-based materials showed significantly higher fracture resistance than biodentine and conventional composites.
- Favorable fracture patterns were more common in fiber-reinforced restorations compared to conventional composites.
- Biomimetic materials promote better structural integrity during orthodontic intrusion and extrusion.

## Abstract

The biomechanical function of teeth with endodontic treatment is directly impacted by the restorative material chosen. It has been
demonstrated that biomimetic restorative techniques, such as fiber-reinforced composites, polyethylene fibre reinforcement, and bioactive
core materials, more successfully mimic the functional characteristics of natural dentin and enamel than traditional composites.
Therefore, it is of interest to evaluate the strengthening effect of biomimetic restorative materials on root canal-treated teeth
subjected to orthodontic intrusion and extrusion. Forty extracted maxillary premolars were restored using short fibre-reinforced
composite, polyethylene fibre with composite, biodentine, or conventional composite, and tested under 150 g orthodontic force. Teeth
restored with fibre-based materials exhibited significantly higher fracture resistance than biodentine and control groups (p < 0.05).
Favorable fracture patterns predominated in fibre-reinforced groups, while conventional composites showed mainly unfavorable fractures.
Biomimetic restorations, particularly fibre-based materials, enhance fracture resistance and promote favorable failure modes during
orthodontic loading.