Post preparation: cleanness achieved by different irrigating protocols

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Smear layer removal is crucial for successful post-endodontic restorations.
• Fiber post preparation can generate a smear layer that impedes adhesion.

Purpose of the Study:

• To evaluate the efficacy of various irrigation protocols in eliminating the smear layer from root canal walls and dentinal tubules after fiber post preparation.

Main Methods:

• Fifty human premolars underwent endodontic treatment and post space preparation.
• Five irrigation groups were tested: no irrigation, distilled water activation, 5.25% sodium hypochlorite (NaOCl), 17% ethylenediaminetetraacetic acid (EDTA) + 5.25% NaOCl, and 10% polyacrylic acid.
• Scanning Electron Microscopy (SEM) was used to assess smear layer removal at different root thirds.

Main Results:

• The combination of 17% EDTA and 5.25% NaOCl, and 10% polyacrylic acid demonstrated superior smear layer removal compared to other groups.
• No significant differences in smear layer removal were observed between the coronal, middle, and apical thirds of the root canals.
• Statistical analysis revealed significant differences among the tested irrigants (p<0.05).

Conclusions:

• The combination of EDTA and NaOCl, and polyacrylic acid are effective irrigants for removing smear layer during fiber post preparation.
• Effective smear layer removal is essential for optimal bonding of fiber posts to the root canal dentin.