[New research on endodontic carbon-fiber posts]

Area of Science:

• Dental materials science
• Prosthodontics
• Biomaterials engineering

Background:

• Fiber-carbon posts are widely used in dental restorations.
• Clinical experience and university studies support their use, focusing on mechanical resistance and retention.
• Luting procedures are identified as a critical area for improvement in post retention.

Purpose of the Study:

• To evaluate the retention of fiber-carbon posts.
• To compare the effectiveness of different composite cements and post designs.
• To identify factors influencing the cement-post and cement-root channel interface.

Main Methods:

• Clinical experience over 4 years with fiber-carbon posts.
• Mechanical resistance and retention testing of posts and cements.
• Evaluation of luting procedures and cement-post junction integrity.
• Testing of a novel fiber-carbon post (Composipost Retentive) with circumferential grooves.
• Tensile strength testing of composite cements using an Instron machine.

Main Results:

• Standard fiber-carbon posts showed no significant retention increase with Sealbond and Flexi-Flow cements; failure occurred at the cement-post junction.
• The Composipost Retentive, featuring circumferential grooves, demonstrated significantly superior retention.
• Five composite cements (Sticky Post, Flexi-Flow, Sealbond, Super Bond, All Bond II) were tested.
• Super Bond and All Bond II exhibited high tensile strength (>120 kg) and substantial penetration into dentinal tubules.

Conclusions:

• Luting procedures are a critical factor influencing fiber-carbon post retention.
• The Composipost Retentive design with circumferential grooves markedly enhances post retention.
• Composite cements like Super Bond and All Bond II provide excellent retention and interface bonding due to their penetration into dentinal tubules.