Retention of four endodontic posts cemented with composite resin

Area of Science:

• Restorative Dentistry
• Biomaterials Science

Background:

• Post and core restorations are crucial for restoring function and aesthetics of endodontically treated teeth.
• Various post systems exist, including active, passive metal, passive burnout, and ceramic designs, each with unique retentive properties.
• Understanding the retentive capacity of different post systems is essential for predictable clinical outcomes.

Purpose of the Study:

• To compare the retention of four different post systems: Flexi-Flange (active), ParaPost (passive metal), ExactaCast (passive burnout) with and without grooved dentin walls, and Cerapost (zirconium oxide ceramic).

Main Methods:

• The study evaluated the retentive strength of five post configurations: Flexi-Flange, ParaPost, ExactaCast (without grooving), ExactaCast (with grooving), and Cerapost.
• Retention was measured in pounds (lb) using a standardized testing protocol.

Main Results:

• The Flexi-Flange post system, when used with Flexi-Flow Natural cement, exhibited the highest retentive value (270.4 lb).
• The Cerapost cemented with Universal Cement showed the lowest retention (23.4 lb).
• The ExactaCast system with grooved dentin walls demonstrated significantly higher retention than the non-grooved ExactaCast, ParaPost, and Cerapost systems. Both ExactaCast groups and the ParaPost group had greater retention than the Cerapost.

Conclusions:

• The active Flexi-Flange post system offers superior retention compared to passive metal, passive burnout, and ceramic post systems.
• Modifying the internal dentin wall by grooving can significantly enhance the retention of passive burnout post systems.
• Clinicians should consider the retentive characteristics of different post systems when selecting the most appropriate option for restoration.