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Formaldehyde release from root-canal sealers: influence of method
1Department of Conservative Dentistry, Ruprecht-Karls University, Heidelberg, Germany.
International Endodontic Journal
|June 5, 1999
Summary
Formaldehyde release from root-canal sealers varies based on material type, mixing, and setting time. Standardized in-vitro testing for formaldehyde release remains challenging.
Area of Science:
- Endodontics
- Materials Science
- Analytical Chemistry
Background:
- Root-canal sealers are crucial in endodontic therapy.
- Some sealers may release formaldehyde, a potential irritant.
- Understanding formaldehyde release is vital for patient safety.
Observation:
- Formaldehyde release was quantified from phenol resin, epoxy resin, and paraformaldehyde-containing zinc oxide eugenol sealers.
- Measurements were taken at different time points (fresh, 2 days, 2 weeks) and under varying conditions (mixing ratios, sample sizes).
- Spectrophotometry was employed to detect formaldehyde post-reaction.
Findings:
- Formaldehyde release was significantly influenced by the sealer type, mixing ratio, and specimen surface area to weight ratio.
- Time after mixing also played a role in the amount of formaldehyde detected.
- No single factor universally predicted formaldehyde release across all tested sealers.
Implications:
- Developing a universal in-vitro test for endodontic sealer formaldehyde release is complex.
- Predicting in-vivo formaldehyde release based on in-vitro studies presents significant challenges.
- Further research is needed to establish reliable methods for assessing sealer safety.