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

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Endodontics

Background:

• Fiber-reinforced composite (GFRC) posts are widely used in dental restorations.
• Accurate fitting of posts to root canals is crucial for long-term success.
• Understanding cement layer thickness and defect presence is vital for post stability.

Purpose of the Study:

• To conduct a preliminary analysis of GFRC post fitting within tooth root canals.
• To determine the resin cement layer thickness around different GFRC post types.
• To compare the fit and cement interface of bundle, sleeve, and accessory GFRC posts.

Main Methods:

• Assessed three types of GFRC posts: bundle, sleeve, and accessory systems.
• Used 24 endodontically treated human pre-molars, divided into six groups based on post and cement type.
• Cross-sectioned specimens for optical microscopy to evaluate cement thickness and defects (pores, voids, fissures).

Main Results:

• Bundle and accessory posts demonstrated regular resin cement distribution with fewer voids than sleeve systems.
• Sleeve system posts exhibited poor fitting, particularly in the apical root canal portions.
• Resin cement type did not significantly impact interface thickness; bundle and accessory posts facilitated better cement and fiber distribution.

Conclusions:

• Bundle and accessory GFRC posts show promising fitting characteristics in oval root canals.
• Sleeve system posts demonstrated adequate fit only in the coronal canal regions.
• This preliminary study provides insights into GFRC post adaptation and cement interface properties.