Microtensile bond strength between adhesive cements and root canal dentin

Area of Science:

• Dental Materials Science
• Endodontics
• Biomaterials Engineering

Background:

• Root canal post cementation is crucial for restoring function.
• Adhesive cement bond strength to dentin is influenced by various factors.
• Understanding these factors is key to improving clinical success.

Purpose of the Study:

• To evaluate the bond strength of different adhesive cements to root canal dentin.
• To determine the influence of configuration factor, polymerization, and luting material on bond strength.
• To assess if bond strength decreases towards the root apex.

Main Methods:

• Four luting materials (Single Bond/Rely X ARC, ED Primer/Panavia F, C and B Metabond, Fuji Plus) were tested on human teeth.
• Specimens were prepared with intact or flat root canals.
• Bond strength (muTBS) was measured after sectioning and mechanical testing.

Main Results:

• All cements exhibited lower bond strengths in intact roots compared to flat roots.
• C and B Metabond and Fuji Plus showed significantly higher bond strengths than Single Bond/Rely X ARC and Panavia F.
• Single Bond/Rely X ARC and Fuji Plus demonstrated decreased bond strength near the root apex.

Conclusions:

• Polymerization shrinkage stresses and limited root canal access negatively impact bond strength.
• Material selection and clinical technique are critical for successful endodontic post cementation.
• Further research is needed to optimize cementation protocols for enhanced bond durability.