# Fitting of Different Intraradicular Composite Posts to Oval Tooth Root Canals: A Preliminary Assessment

## TL;DR

This study compares how well different fiber-reinforced composite posts fit into oval-shaped tooth root canals and evaluates the thickness of the resin cement layer.

## Contribution

The study introduces a preliminary assessment of fiber-reinforced composite post fitting in oval root canals and evaluates cement layer thickness.

## Key findings

- Bundle and accessory posts showed better resin cement distribution and fewer voids compared to sleeve systems.
- Sleeve system posts had poor fitting at the apical portion of the root canals.
- The type of resin cement did not affect the interface thickness, but bundle and accessory posts allowed better fiber and cement distribution.

## Abstract

The purpose of the present study was to perform a preliminary analysis of the fitting of different fiber-reinforced composite (GFRC) posts to tooth root canals and determine the resin cement layer thickness. The following GFRC posts were assessed: bundle posts (Rebilda GTTM, VOCO, Germany), sleeve system (SAPTM, Angelus Ind, Brazil), and accessory posts (ReforpinTM, Angelus, Brazil). Twenty-four freshly extracted mandibular single-rooted pre-molars were endodontically treated and divided into six groups, according to the type of GFRC post and resin cement (self-adhesive or conventional dual-cured). Then, specimens were cross-sectioned and inspected by optical microscopy regarding the cement layer thickness and presence of defects such as pores, voids, or fissures were assessed. Bundle and accessory posts revealed a regular distribution of resin cement with a lower number of voids than found with sleeve systems. The sleeve system posts showed poor fitting at the apical portion of the root canals. The type of resin cement did not affect the thickness of the interface, although both bundle and accessory posts allow a better distribution of resin cement and fibers. The present preliminary study reveals interesting insights on the fitting of bundle and accessory posts to root dentin and resin cement layer thickness in oval-shape root canals. The sleeve system posts showed adequate fitting only at the coronal portion of the canals.