# FEM study of root stress patterns during extrusion versus intrusion movements using aligners

## TL;DR

This study uses FEM to compare root stress during tooth extrusion and intrusion with aligners, finding higher stress during extrusion.

## Contribution

The study introduces new FEM-based insights into root stress differences during extrusion and intrusion with aligners.

## Key findings

- Extrusion movements caused higher root stress than intrusion.
- Stress levels varied across different tooth types.
- The study highlights risks of root resorption during aligner therapy.

## Abstract

The use of finite element modeling (FEM) to analyze root stress patterns during extrusion and intrusion movements using clear aligners
is gaining momentum. The results showed that extrusion movements generated higher root stress compared to intrusion, with variations
observed across different tooth types. The study provided insights into the potential risks of root resorption during aligner therapy,
emphasizing the importance of controlled movement. This can help clinicians optimize treatment plans to minimize adverse effects on
tooth roots. However, more data is needed to explore the long-term implications of aligner treatments on root health.