Reliability of the dye penetration studies

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Assessing the apical seal is crucial for endodontic treatment success.
• Traditional dye penetration methods have limitations in accurately quantifying leakage.

Purpose of the Study:

• To compare the efficacy of classical dye penetration, dye extraction, and fluid filtration methods for evaluating apical seal.
• To introduce and validate a novel dye-extraction technique for assessing root canal sealers.

Main Methods:

• Forty teeth were prepared and divided into four groups based on the root canal sealer used (Pulp Canal Sealer, Sealapex, AH Plus, Ketac-Endo).
• Apical seal was assessed using fluid filtration, 2% methylene blue dye penetration, and a new dye-extraction method involving root dissolution in nitric acid.
• Absorbance of extracted dye was measured to quantify leakage.

Main Results:

• Classical dye penetration failed to differentiate between sealers and showed no correlation with fluid filtration or dye extraction.
• Both fluid filtration and dye extraction methods identified Sealapex as having the highest apical leakage (p < 0.01).
• A significant correlation (p = 0.001, r = 0.7) was found between fluid filtration and dye extraction results.

Conclusions:

• Classical dye penetration methods have significant limitations in evaluating apical seal.
• The dye-extraction method provides results comparable to fluid filtration, offering a more reliable and time-efficient alternative.
• This study validates the dye-extraction technique as a superior method for assessing apical seal in endodontics.