Copper ion as a new leakage tracer

Area of Science:

• Endodontics
• Dental Materials Science
• Biomaterials

Background:

• Root canal treatment failures are often linked to bacterial ingress due to incomplete obturation and poor apical sealing.
• In-vitro methods assessing seal quality typically measure microleakage, allowing tracer agents to penetrate the filled canal.

Purpose of the Study:

• To evaluate the efficacy of the copper ion diffusion method for assessing root canal seal quality.
• To compare the results of the copper ion diffusion method with the conventional dye penetration method.

Main Methods:

• Extracted teeth underwent root canal preparation and were filled using the lateral condensation technique.
• Copper ion diffusion was measured using atomic absorption spectrophotometry after immersing teeth in copper sulfate solution.
• Dye penetration was assessed after immersing teeth in methylene blue and sectioning for stereomicroscopic evaluation.

Main Results:

• Copper ion concentrations in the experimental group ranged from 2.87 to 18.37 ppm.
• Dye penetration depths in the experimental group varied from 3.5 to 8.5 mm.
• Statistical analysis revealed a poor correlation between the copper ion diffusion and dye penetration measurements.

Conclusions:

• The copper ion diffusion method and the dye penetration method showed no significant correlation in assessing the seal of root canal-treated teeth.
• Further research is needed to validate new in-vitro methods for endodontic seal evaluation.