Enhanced and safe removal of a novel experimental fiber-colored post: an in vitro micro-CT study.

Abstract

Objectives: Post-removal can be challenging and may increase the risk of iatrogenic damage during endodontic retreatment. This study evaluated the efficacy and efficiency of removing a novel fiber-colored post specifically designed to facilitate retrieval.

Materials and methods: Twenty mandibular premolars were instrumented with an R50 file and irrigated using 2.5% NaOCl and 17% EDTA under ultrasonic agitation. The roots were filled with AH Plus, and post spaces were prepared. Micro-CT scans were performed before post-cementation and after post-removal. Specimens were divided into two groups: Control - Exacto post (Angelus) and Experimental - fiber-colored post (patent granted). Post-removal was performed under magnification with ultrasonic tips activated for 20-second intervals, with pauses for tip cooling, canal irrigation and drying. Outcomes included working time, dentin loss, residual material, canal deviation, and procedural quality. Data were analyzed using the T-test and Mann-Whitney at 5%.

Results: The fiber-colored post showed a significantly shorter removal time (p = 0.023), with less dentin loss and residual material (p < 0.0001). The control group exhibited severe deviations from the root axis and a 30% perforation rate, whereas fiber-colored posts had no perforations and most samples without deviation (p < 0.0001).

Conclusions: The experimental fiber-colored posts enhanced removal efficiency, safety, and predictability.

Clinical relevance: Fiber-colored posts represent a promising restorative alternative that can facilitate post-removal during reintervention, helping to prevent iatrogenic damage and preserve tooth structure.