The antibacterial effect of SPAD.

Area of Science:

• Endodontics
• Microbiology
• Dental Materials Science

Background:

• Root canal infections often involve bacteria like Streptococcus group D.
• Effective antibacterial agents are crucial for successful root canal therapy.
• Paraformaldehyde-based pastes are used for obturation, while calcium hydroxide is used for apexification.

Purpose of the Study:

• To compare the antibacterial efficacy of SPAD (a paraformaldehyde-based obturation paste) with calcium hydroxide apexification paste.
• To evaluate the antibacterial activity over time.
• To assess the inhibition of Streptococcus group D growth.

Main Methods:

• In vitro study comparing SPAD and calcium hydroxide paste.
• Materials placed in cultures with Streptococcus group D isolated from infected root canals.
• Antibacterial effect evaluated by measuring bacterial inhibition zones at 3, 7, and 15 days.
• Incubation periods of 24, 48, and 27 hours for zone measurement.

Main Results:

• SPAD exhibited wide bacterial inhibition zones, indicating strong antibacterial activity.
• The antibacterial effect of SPAD diminished over time as formaldehyde release decreased.
• Calcium hydroxide paste demonstrated no significant antibacterial effect throughout the study period.

Conclusions:

• SPAD possesses potent, albeit time-dependent, antibacterial properties against Streptococcus group D.
• Calcium hydroxide paste lacks significant antibacterial efficacy in this experimental model.
• SPAD may be a more effective option for managing bacterial contamination in root canals compared to calcium hydroxide.