# Comparative evaluation of ferrule designs regarding fracture resistance about crowned anterior teeth using prefabricated post and composite core under direct loading: An in vitro study

## TL;DR

This study compares how different ferrule designs affect the strength of crowned front teeth under pressure, finding that a 2 mm ferrule provides the best protection.

## Contribution

The study introduces a direct loading in vitro evaluation of various ferrule designs on fracture resistance of crowned anterior teeth.

## Key findings

- A 2 mm circumferential ferrule showed the highest fracture resistance.
- The group with no ferrule had the lowest fracture resistance.
- Statistical differences were found among most groups, except between Group 2 and Group 3.

## Abstract

The effect of different ferrule designs on the fracture resistance of endodontically treated maxillary central incisors. Caries-free
maxillary central incisors were endodontically treated and divided into five groups (n=12) based on ferrule design. All teeth were
restored with prefabricated glass fiber posts, composite cores and metal crowns, then subjected to compressive loading using a universal
testing machine. The group with a 2 mm circumferential ferrule showed the highest fracture resistance, while the group with no ferrule
exhibited the lowest. Statistically significant differences were found among most groups, except between Group 2 and Group 3
(p=0.025).