Tensile dislodgment evaluation of two experimental prefabricated post systems

Area of Science:

• Dental Materials Science
• Prosthodontics
• Biomaterials Engineering

Background:

• Dental posts are used to retain restorations in endodontically treated teeth.
• Different post designs (active, passive, combined) and materials influence retention and biomechanical behavior.
• Understanding the tensile dislodgment forces is crucial for predicting clinical success.

Purpose of the Study:

• To compare the tensile dislodgment forces of two experimental post designs (ParaPost XT-7 and XT-10) against established post systems (Flexi-Post and Standard ParaPost).
• To evaluate the effect of active threading versus passive serration on post retention.
• To assess the performance of a combined active/passive post design.

Main Methods:

• Tensile dislodgment forces were measured for four post systems: XT-7 (7mm active), XT-10 (7mm coronal active, passive apical), Flexi-Post (active), and Standard ParaPost (passive).
• Posts were threaded into the coronal aspect of the root.
• Materials tested included titanium alloy and stainless steel.

Main Results:

• Active post systems exhibited the highest tensile dislodgment forces, indicating superior retention.
• The passive post system demonstrated the lowest retention.
• The combined active/passive post design showed intermediate retention values.

Conclusions:

• Active post designs provide superior retention compared to passive designs.
• Combined active/passive designs offer a balance between retention and potentially other biomechanical properties.
• The XT-7 active post design showed promising results for enhanced dental post retention.